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Leslie Zhai via llvm-dev

2018-Sep-11 01:38 UTC

[llvm-dev] OpenJDK8 failed to work after compiled by LLVM 8 for X86

Hi Dimitry,

Thanks for your kind response!

Thanks for the commit message of Jung's patch,  I found that the bug had 
been fixed in OpenJDK 12 by Zhengyu 
https://bugs.openjdk.java.net/browse/JDK-8205965  But only backported to 
11.  So Jung could backport it for OpenJDK 8, thanks a lot!

But I argue that the root cause might be in the compiler side, why 
clang-3.9.1, gcc-6.4.1 couldn't reproduce the bug?  And it might be work 
for clang-4.0 https://bugs.openjdk.java.net/browse/JDK-8208494  I will 
test LLVM 5 to check out whether or not reproducible.


在 2018年09月11日 00:59, Dimitry Andric 写道:> Hi Leslie,
>
> This is likely the same problem as was reported in
https://bugs.freebsd.org/225054#c8, and fixed by the following patch:
>
>
https://svnweb.freebsd.org/ports/head/java/openjdk8/files/patch-hotspot_src_share_vm_services_memTracker.cpp?view=markup&pathrev=459368
>
> Can you please try that out, and see if it fixes it for you too?
>
> -Dimitry
>
>> On 10 Sep 2018, at 18:20, Leslie Zhai via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>>
>> Hi all,
>>
>> OpenJDK8 jdk8u-dev[1] is just able to work after compiled with LLVM
3.9.1 for X86:
>>
>> $
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java
-version
>> openjdk version "1.8.0-internal-debug"
>> OpenJDK Runtime Environment (build
1.8.0-internal-debug-xiangzhai_2018_09_09_21_08-b00)
>> OpenJDK 64-Bit Server VM (build 25.71-b00-debug, mixed mode)
>>
>> $ strings
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java | grep
clang
>> clang version 3.9.1 (tags/RELEASE_391/final)
>>
>> But it failed to work after compiled with LLVM 8 for X86:
>>
>> $
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>> Segmentation fault
>>
>> $ gdb --ex run --args
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>> GNU gdb (GDB) Fedora 7.12.1-48.fc25
>> ...
>> Starting program:
/home/xiangzhai/project/jdk8u-llvm/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>> [Thread debugging using libthread_db enabled]
>> Using host libthread_db library "/lib64/libthread_db.so.1".
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> [ Legend: Modified register | Code | Heap | Stack | String ]
>>
───────────────────────────────────────────────────────────────────────────────────────────────[
registers ]────
>> $rax   : 0x0
>> $rbx   : 0x0
>> $rcx   : 0x7ffff7315eb0      →  0x00007ffff6ae30a0  →
<NativeCallStack::print_on(outputStream*)+0> xor edx, edx
>> $rdx   : 0x0
>> $rsp   : 0x7fffffff9328      →  0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx
>> $rbp   : 0x7fffffff93c0      →  0x00007fffffff94f0  →
0x00007fffffff9510  →  0x0000000000000002
>> $rsi   : 0x0
>> $rdi   : 0x7ffff7315e70      →  0x00007ffff7315eb0  →
0x00007ffff6ae30a0  → <NativeCallStack::print_on(outputStream*)+0> xor
edx, edx
>> $rip   : 0x7ffff6ae2f5b      →
<NativeCallStack::NativeCallStack(int,+0> mov QWORD PTR [rdi], rcx
>> $r8    : 0x1
>> $r9    : 0xf
>> $r10   : 0x64
>> $r11   : 0x0
>> $r12   : 0x7fffffffdc88      →  0x00007fffffffe04c  →
"/home/xiangzhai/project/jdk8u-llvm/build/linux-x86[...]"
>> $r13   : 0x7fffffffdca0      →  0x00007fffffffe0bf  →
"XDG_VTNR=1"
>> $r14   : 0x7fffffff9330      →  "NMT_LEVEL_10535"
>> $r15   : 0x6
>> $eflags: [carry parity adjust zero sign trap INTERRUPT direction
overflow RESUME virtualx86 identification]
>> $ss: 0x002b  $ds: 0x0000  $cs: 0x0033  $es: 0x0000  $gs: 0x0000 $fs:
0x0000
>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
stack ]────
>> 0x00007fffffff9328│+0x00: 0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx    ← $rsp
>> 0x00007fffffff9330│+0x08: "NMT_LEVEL_10535"      ← $r14
>> 0x00007fffffff9338│+0x10: 0x0035333530315f4c ("L_10535"?)
>> 0x00007fffffff9340│+0x18: 0x0000000000000001
>> 0x00007fffffff9348│+0x20: 0x0000000000602190  → 0x00007ffff5eb7000  → 
0x00010102464c457f
>> 0x00007fffffff9350│+0x28: 0x0000000000000004
>> 0x00007fffffff9358│+0x30: 0x000000066474e551
>> 0x00007fffffff9360│+0x38: 0x0000000000000000
>>
────────────────────────────────────────────────────────────────────────────────────────[
code:i386:x86-64 ]────
>>     0x7ffff6ae2f4b
<print_owned_locks_on_error(outputStream*)+187> add    eax, 0x1f0f00
>>     0x7ffff6ae2f50 <NativeCallStack::NativeCallStack(int,+0> mov 
rcx, QWORD PTR [rip+0x842781]        # 0x7ffff73256d8
>>     0x7ffff6ae2f57 <NativeCallStack::NativeCallStack(int,+0> add 
rcx, 0x10
>>   → 0x7ffff6ae2f5b <NativeCallStack::NativeCallStack(int,+0> mov 
QWORD PTR [rdi], rcx
>>     0x7ffff6ae2f5e <NativeCallStack::NativeCallStack(int,+0> mov 
DWORD PTR [rdi+0x28], 0x0
>>     0x7ffff6ae2f65 <NativeCallStack::NativeCallStack(int,+0> add 
rdi, 0x8
>>     0x7ffff6ae2f69 <NativeCallStack::NativeCallStack(int,+0> test
edx, edx
>>     0x7ffff6ae2f6b <NativeCallStack::NativeCallStack(int,+0> je  
0x7ffff6ae2f7b <NativeCallStack::NativeCallStack(int, bool)+43>
>>     0x7ffff6ae2f6d <NativeCallStack::NativeCallStack(int,+0> mov 
eax, esi
>> ─────────[
source:/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp+33
]────
>>       28  #include "utilities/nativeCallStack.hpp"
>>       29
>>       30  const NativeCallStack NativeCallStack::EMPTY_STACK(0, false);
>>       31
>>       32  NativeCallStack::NativeCallStack(int toSkip, bool fillStack)
:
>>   →   33    _hash_value(0) {
>>       34
>>       35  #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
>>       36    fillStack = false;
>>       37  #endif
>>       38
>>
─────────────────────────────────────────────────────────────────────────────────────────────────[
threads ]────
>> [#0] Id 1, Name: "java", stopped, reason: SIGSEGV
>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
trace ]────
>> [#0] 0x7ffff6ae2f5b → Name:
NativeCallStack::NativeCallStack(this=0x7ffff7315e70
<NativeCallStack::EMPTY_STACK>, toSkip=0x0, fillStack=0x0)
>> [#1] 0x7ffff6a76822 → Name: MemTracker::init_tracking_level()
>> [#2] 0x7ffff62eff49 → Name: MemTracker::tracking_level()
>> [#3] 0x7ffff62eff49 → Name: ResourceObj::operator new(size=0x20,
type=ResourceObj::STACK_OR_EMBEDDED, flags=<optimized out>)
>> [#4] 0x7ffff61369ec → Name: _GLOBAL__sub_I_c1_Greedy.cpp()
>> [#5] 0x7ffff7de7d9a → Name: call_init(l=<optimized out>,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>> [#6] 0x7ffff7de7eab → Name: call_init(env=0x7fffffffdca0,
argv=0x7fffffffdc88, argc=0x2, l=<optimized out>)
>> [#7] 0x7ffff7de7eab → Name: _dl_init(main_map=0x602190, argc=0x2,
argv=0x7fffffffdc88, env=0x7fffffffdca0)
>> [#8] 0x7ffff7dece46 → Name: dl_open_worker(a=0x7fffffff97e0)
>> [#9] 0x7ffff7de7c44 → Name: _dl_catch_error(objname=0x7fffffff97d0,
errstring=0x7fffffff97d8, mallocedp=0x7fffffff97cf, operate=0x7ffff7decae0
<dl_open_worker>, args=0x7fffffff97e0)
>>
────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>> 0x00007ffff6ae2f5b in NativeCallStack::NativeCallStack
(this=0x7ffff7315e70 <NativeCallStack::EMPTY_STACK>, toSkip=0x0,
fillStack=0x0) at
/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp:33
>> 33        _hash_value(0) {
>> gef➤  c
>> Continuing.
>>
>> Program terminated with signal SIGSEGV, Segmentation fault.
>> The program no longer exists.
>> gef➤
>>
>> ----- 8< -------- 8< -------- 8< -------- 8< -------- 8<
-------- 8< ---
>>
>> I started to use and contribute clang static analyzer[2] just for
finding the bugs for open source software from LLVM 3.x,  perhaps it is a bug of
LLVM 8,  because jdk8u is just able to print out '-version' after
compiled with llvm-3.9.1,  I will rebuild the LLVM 8 again,  then rebuild jdk8u
for triple check.
>>
>> 1. Workaround-compile-with-llvm.patch
https://raw.githubusercontent.com/xiangzhai/jdk8u-dev/master/Workaround-compile-with-llvm.patch
>>
>> 2.
https://github.com/llvm-mirror/clang/commit/a530e823ed2793ac149de7a984014e242a787682#diff-ff9160d4628cb9b6186559837c2c8668
>>
>> 3. The build option of LLVM 8 (bootstrap with LLVM 3.9.1):
>>
>> cmake .. -DCMAKE_BUILD_TYPE=Release \
>>      -DCMAKE_C_COMPILER=clang \
>>      -DCMAKE_CXX_COMPILER=clang++ \
>>      -DCMAKE_C_FLAGS="-fPIC" \
>>      -DCMAKE_CXX_FLAGS="-std=c++11 -fPIC" \
>>      -DLLVM_BUILD_LLVM_DYLIB=ON \
>>      -DLLVM_LINK_LLVM_DYLIB=ON \
>>      -DLLVM_INSTALL_UTILS=ON \
>>      -DLLVM_ENABLE_RTTI=ON \
>>      -DLLVM_ENABLE_FFI=ON \
>>      -DLLVM_ENABLE_EH=ON \
>>      -DLLVM_BUILD_TESTS=ON \
>>      -DLLVM_BUILD_DOCS=OFF \
>>      -DLLVM_ENABLE_SPHINX=OFF \
>>      -DLLVM_ENABLE_DOXYGEN=OFF \
>>      -DLLDB_DISABLE_LIBEDIT=1 \
>>      -DSPHINX_WARNINGS_AS_ERRORS=OFF \
>>      -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
>>      -DFFI_LIBRARY_DIR:PATH="$(pkg-config --variable=libdir
libffi)" \
>>      -DLLVM_BINUTILS_INCDIR=/usr/include \
>>      -DLLVM_LIBDIR_SUFFIX=64 \
>>      -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
>>      -DLIBUNWIND_ENABLE_SHARED=ON \
>>      -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
>>      -DLLDB_TEST_C_COMPILER=clang \
>>      -DLLDB_TEST_CXX_COMPILER=clang++ \
>>      -DLLVM_DEFAULT_TARGET_TRIPLE="x86_64-redhat-linux" \
>>      -DCLANG_VENDOR="LLVM China"
>>
>> 4. $ clang -v
>> LLVM China clang version 8.0.0 (git at github.com:llvm-mirror/clang.git
81ef98628ebf5186d746c0986dcbf5073e842043) (git at
github.com:llvm-mirror/llvm.git e1aac9723d55497e74d83d216329f08d9842e494) (based
on LLVM 8.0.0svn)
>> Target: x86_64-redhat-linux
>> Thread model: posix
>> InstalledDir: /usr/bin
>> Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-redhat-linux/6.4.1
>> Found candidate GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>> Found candidate GCC installation: /usr/lib/gcc/i686-redhat-linux/6.4.1
>> Found candidate GCC installation:
/usr/lib/gcc/x86_64-redhat-linux/6.4.1
>> Selected GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>> Candidate multilib: .;@m64
>> Candidate multilib: 32;@m32
>> Selected multilib: .;@m64
>>
>> --
>> Regards,
>> Leslie Zhai
>>
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
-- 
Regards,
Leslie Zhai

Dimitry Andric via llvm-dev

2018-Sep-11 08:55 UTC

head link

[llvm-dev] OpenJDK8 failed to work after compiled by LLVM 8 for X86

Hi Leslie,

The problem really lies in the OpenJDK code, as it is attempting to
write to a const object.  If this seems to work with certain compiler(s)
and optimization settings, it is just luck. :-)

Here is a reduced example, which shows the issue:

=====================================================================#include
<new>

class NativeCallStack {
public:
  static const NativeCallStack EMPTY_STACK;

private:
  enum { DEPTH = 4 };
  void* stack[DEPTH];

public:
  NativeCallStack() {
    for (int i = 0; i < DEPTH; ++i) {
      stack[i] = nullptr;
    }
  }
};

const NativeCallStack NativeCallStack::EMPTY_STACK;

int main(void)
{
  // The following should segfault, if EMPTY_STACK was placed into .rodata.
  ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack();
  return 0;
}
=====================================================================
clang 7.0.0 rc2 produces this assembly:

        .globl  main                    # -- Begin function main
        .p2align        4, 0x90
        .type   main, at function
main:                                   # @main
        .cfi_startproc
# %bb.0:                                # %entry
        pushq   %rbp
        .cfi_def_cfa_offset 16
        .cfi_offset %rbp, -16
        movq    %rsp, %rbp
        .cfi_def_cfa_register %rbp
        xorps   %xmm0, %xmm0
        movups  %xmm0, NativeCallStack::EMPTY_STACK+16(%rip)
        movups  %xmm0, NativeCallStack::EMPTY_STACK(%rip)
        xorl    %eax, %eax
        popq    %rbp
        .cfi_def_cfa %rsp, 8
        retq
.Lfunc_end0:
        .size   main, .Lfunc_end0-main
        .cfi_endproc
                                        # -- End function
        .type   NativeCallStack::EMPTY_STACK, at object #
@NativeCallStack::EMPTY_STACK
        .section        .rodata,"a", at progbits
        .globl  NativeCallStack::EMPTY_STACK
        .p2align        3
NativeCallStack::EMPTY_STACK:
        .zero   32
        .size   NativeCallStack::EMPTY_STACK, 32

The whole constructor has been optimized out, and EMPTY_STACK has been
replaced by .zero 32, placed in the .rodata segment, which is a
perfectly valid transformation.

Then, in main(), an attempt is made to write to that read-only segment,
which will usually segfault, depending on how strictly the underlying
operating system enforces these protections.

In contrast, gcc 8.2.0 produces:

        .globl  main
        .type   main, @function
main:
.LFB74:
        .cfi_startproc
        movq    $0, NativeCallStack::EMPTY_STACK(%rip)
        xorl    %eax, %eax
        movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
        movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
        movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
        ret
        .cfi_endproc
.LFE74:
        .size   main, .-main
        .p2align 4,,15
        .type   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE, @function
_GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE:
.LFB76:
        .cfi_startproc
        movq    $0, NativeCallStack::EMPTY_STACK(%rip)
        movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
        movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
        movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
        ret
        .cfi_endproc
.LFE76:
        .size   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE,
.-_GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
        .section        .ctors,"aw", at progbits
        .align 8
        .quad   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
        .globl  NativeCallStack::EMPTY_STACK
        .bss
        .align 32
        .type   NativeCallStack::EMPTY_STACK, @object
        .size   NativeCallStack::EMPTY_STACK, 32
NativeCallStack::EMPTY_STACK:
        .zero   32

Here you can see that gcc decided to not place EMPTY_STACK in .rodata,
but in .bss, which is read/write.  It adds the global constructor to
the .ctors section, so the dynamic linker is made responsible for
calling it.

Note that now the EMPTY_STACK object is unnecessarily initialized twice,
once by the global constructor, and once in main.

-Dimitry
> On 11 Sep 2018, at 03:38, Leslie Zhai <zhaixiang at loongson.cn>
wrote:
> 
> Hi Dimitry,
> 
> Thanks for your kind response!
> 
> Thanks for the commit message of Jung's patch,  I found that the bug
had been fixed in OpenJDK 12 by Zhengyu
https://bugs.openjdk.java.net/browse/JDK-8205965  But only backported to 11.  So
Jung could backport it for OpenJDK 8, thanks a lot!
> 
> But I argue that the root cause might be in the compiler side, why
clang-3.9.1, gcc-6.4.1 couldn't reproduce the bug?  And it might be work for
clang-4.0 https://bugs.openjdk.java.net/browse/JDK-8208494  I will test LLVM 5
to check out whether or not reproducible.
> 
> 
> 在 2018年09月11日 00:59, Dimitry Andric 写道:
>> Hi Leslie,
>> 
>> This is likely the same problem as was reported in
https://bugs.freebsd.org/225054#c8, and fixed by the following patch:
>> 
>>
https://svnweb.freebsd.org/ports/head/java/openjdk8/files/patch-hotspot_src_share_vm_services_memTracker.cpp?view=markup&pathrev=459368
>> 
>> Can you please try that out, and see if it fixes it for you too?
>> 
>> -Dimitry
>> 
>>> On 10 Sep 2018, at 18:20, Leslie Zhai via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
>>> 
>>> Hi all,
>>> 
>>> OpenJDK8 jdk8u-dev[1] is just able to work after compiled with LLVM
3.9.1 for X86:
>>> 
>>> $
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java
-version
>>> openjdk version "1.8.0-internal-debug"
>>> OpenJDK Runtime Environment (build
1.8.0-internal-debug-xiangzhai_2018_09_09_21_08-b00)
>>> OpenJDK 64-Bit Server VM (build 25.71-b00-debug, mixed mode)
>>> 
>>> $ strings
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java | grep
clang
>>> clang version 3.9.1 (tags/RELEASE_391/final)
>>> 
>>> But it failed to work after compiled with LLVM 8 for X86:
>>> 
>>> $
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>> Segmentation fault
>>> 
>>> $ gdb --ex run --args
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>> GNU gdb (GDB) Fedora 7.12.1-48.fc25
>>> ...
>>> Starting program:
/home/xiangzhai/project/jdk8u-llvm/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>> [Thread debugging using libthread_db enabled]
>>> Using host libthread_db library
"/lib64/libthread_db.so.1".
>>> 
>>> Program received signal SIGSEGV, Segmentation fault.
>>> [ Legend: Modified register | Code | Heap | Stack | String ]
>>>
───────────────────────────────────────────────────────────────────────────────────────────────[
registers ]────
>>> $rax   : 0x0
>>> $rbx   : 0x0
>>> $rcx   : 0x7ffff7315eb0      →  0x00007ffff6ae30a0  →
<NativeCallStack::print_on(outputStream*)+0> xor edx, edx
>>> $rdx   : 0x0
>>> $rsp   : 0x7fffffff9328      →  0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx
>>> $rbp   : 0x7fffffff93c0      →  0x00007fffffff94f0  →
0x00007fffffff9510  →  0x0000000000000002
>>> $rsi   : 0x0
>>> $rdi   : 0x7ffff7315e70      →  0x00007ffff7315eb0  →
0x00007ffff6ae30a0  → <NativeCallStack::print_on(outputStream*)+0> xor
edx, edx
>>> $rip   : 0x7ffff6ae2f5b      →
<NativeCallStack::NativeCallStack(int,+0> mov QWORD PTR [rdi], rcx
>>> $r8    : 0x1
>>> $r9    : 0xf
>>> $r10   : 0x64
>>> $r11   : 0x0
>>> $r12   : 0x7fffffffdc88      →  0x00007fffffffe04c  →
"/home/xiangzhai/project/jdk8u-llvm/build/linux-x86[...]"
>>> $r13   : 0x7fffffffdca0      →  0x00007fffffffe0bf  →
"XDG_VTNR=1"
>>> $r14   : 0x7fffffff9330      →  "NMT_LEVEL_10535"
>>> $r15   : 0x6
>>> $eflags: [carry parity adjust zero sign trap INTERRUPT direction
overflow RESUME virtualx86 identification]
>>> $ss: 0x002b  $ds: 0x0000  $cs: 0x0033  $es: 0x0000  $gs: 0x0000
$fs: 0x0000
>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
stack ]────
>>> 0x00007fffffff9328│+0x00: 0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx    ← $rsp
>>> 0x00007fffffff9330│+0x08: "NMT_LEVEL_10535"      ← $r14
>>> 0x00007fffffff9338│+0x10: 0x0035333530315f4c ("L_10535"?)
>>> 0x00007fffffff9340│+0x18: 0x0000000000000001
>>> 0x00007fffffff9348│+0x20: 0x0000000000602190  → 0x00007ffff5eb7000 
→  0x00010102464c457f
>>> 0x00007fffffff9350│+0x28: 0x0000000000000004
>>> 0x00007fffffff9358│+0x30: 0x000000066474e551
>>> 0x00007fffffff9360│+0x38: 0x0000000000000000
>>>
────────────────────────────────────────────────────────────────────────────────────────[
code:i386:x86-64 ]────
>>>    0x7ffff6ae2f4b
<print_owned_locks_on_error(outputStream*)+187> add    eax, 0x1f0f00
>>>    0x7ffff6ae2f50 <NativeCallStack::NativeCallStack(int,+0>
mov    rcx, QWORD PTR [rip+0x842781]        # 0x7ffff73256d8
>>>    0x7ffff6ae2f57 <NativeCallStack::NativeCallStack(int,+0>
add    rcx, 0x10
>>>  → 0x7ffff6ae2f5b <NativeCallStack::NativeCallStack(int,+0>
mov    QWORD PTR [rdi], rcx
>>>    0x7ffff6ae2f5e <NativeCallStack::NativeCallStack(int,+0>
mov    DWORD PTR [rdi+0x28], 0x0
>>>    0x7ffff6ae2f65 <NativeCallStack::NativeCallStack(int,+0>
add    rdi, 0x8
>>>    0x7ffff6ae2f69 <NativeCallStack::NativeCallStack(int,+0>
test   edx, edx
>>>    0x7ffff6ae2f6b <NativeCallStack::NativeCallStack(int,+0>
je     0x7ffff6ae2f7b <NativeCallStack::NativeCallStack(int, bool)+43>
>>>    0x7ffff6ae2f6d <NativeCallStack::NativeCallStack(int,+0>
mov    eax, esi
>>> ─────────[
source:/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp+33
]────
>>>      28  #include "utilities/nativeCallStack.hpp"
>>>      29
>>>      30  const NativeCallStack NativeCallStack::EMPTY_STACK(0,
false);
>>>      31
>>>      32  NativeCallStack::NativeCallStack(int toSkip, bool
fillStack) :
>>>  →   33    _hash_value(0) {
>>>      34
>>>      35  #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
>>>      36    fillStack = false;
>>>      37  #endif
>>>      38
>>>
─────────────────────────────────────────────────────────────────────────────────────────────────[
threads ]────
>>> [#0] Id 1, Name: "java", stopped, reason: SIGSEGV
>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
trace ]────
>>> [#0] 0x7ffff6ae2f5b → Name:
NativeCallStack::NativeCallStack(this=0x7ffff7315e70
<NativeCallStack::EMPTY_STACK>, toSkip=0x0, fillStack=0x0)
>>> [#1] 0x7ffff6a76822 → Name: MemTracker::init_tracking_level()
>>> [#2] 0x7ffff62eff49 → Name: MemTracker::tracking_level()
>>> [#3] 0x7ffff62eff49 → Name: ResourceObj::operator new(size=0x20,
type=ResourceObj::STACK_OR_EMBEDDED, flags=<optimized out>)
>>> [#4] 0x7ffff61369ec → Name: _GLOBAL__sub_I_c1_Greedy.cpp()
>>> [#5] 0x7ffff7de7d9a → Name: call_init(l=<optimized out>,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>> [#6] 0x7ffff7de7eab → Name: call_init(env=0x7fffffffdca0,
argv=0x7fffffffdc88, argc=0x2, l=<optimized out>)
>>> [#7] 0x7ffff7de7eab → Name: _dl_init(main_map=0x602190, argc=0x2,
argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>> [#8] 0x7ffff7dece46 → Name: dl_open_worker(a=0x7fffffff97e0)
>>> [#9] 0x7ffff7de7c44 → Name: _dl_catch_error(objname=0x7fffffff97d0,
errstring=0x7fffffff97d8, mallocedp=0x7fffffff97cf, operate=0x7ffff7decae0
<dl_open_worker>, args=0x7fffffff97e0)
>>>
────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>>> 0x00007ffff6ae2f5b in NativeCallStack::NativeCallStack
(this=0x7ffff7315e70 <NativeCallStack::EMPTY_STACK>, toSkip=0x0,
fillStack=0x0) at
/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp:33
>>> 33        _hash_value(0) {
>>> gef➤  c
>>> Continuing.
>>> 
>>> Program terminated with signal SIGSEGV, Segmentation fault.
>>> The program no longer exists.
>>> gef➤
>>> 
>>> ----- 8< -------- 8< -------- 8< -------- 8< --------
8< -------- 8< ---
>>> 
>>> I started to use and contribute clang static analyzer[2] just for
finding the bugs for open source software from LLVM 3.x,  perhaps it is a bug of
LLVM 8,  because jdk8u is just able to print out '-version' after
compiled with llvm-3.9.1,  I will rebuild the LLVM 8 again,  then rebuild jdk8u
for triple check.
>>> 
>>> 1. Workaround-compile-with-llvm.patch
https://raw.githubusercontent.com/xiangzhai/jdk8u-dev/master/Workaround-compile-with-llvm.patch
>>> 
>>> 2.
https://github.com/llvm-mirror/clang/commit/a530e823ed2793ac149de7a984014e242a787682#diff-ff9160d4628cb9b6186559837c2c8668
>>> 
>>> 3. The build option of LLVM 8 (bootstrap with LLVM 3.9.1):
>>> 
>>> cmake .. -DCMAKE_BUILD_TYPE=Release \
>>>     -DCMAKE_C_COMPILER=clang \
>>>     -DCMAKE_CXX_COMPILER=clang++ \
>>>     -DCMAKE_C_FLAGS="-fPIC" \
>>>     -DCMAKE_CXX_FLAGS="-std=c++11 -fPIC" \
>>>     -DLLVM_BUILD_LLVM_DYLIB=ON \
>>>     -DLLVM_LINK_LLVM_DYLIB=ON \
>>>     -DLLVM_INSTALL_UTILS=ON \
>>>     -DLLVM_ENABLE_RTTI=ON \
>>>     -DLLVM_ENABLE_FFI=ON \
>>>     -DLLVM_ENABLE_EH=ON \
>>>     -DLLVM_BUILD_TESTS=ON \
>>>     -DLLVM_BUILD_DOCS=OFF \
>>>     -DLLVM_ENABLE_SPHINX=OFF \
>>>     -DLLVM_ENABLE_DOXYGEN=OFF \
>>>     -DLLDB_DISABLE_LIBEDIT=1 \
>>>     -DSPHINX_WARNINGS_AS_ERRORS=OFF \
>>>     -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
>>>     -DFFI_LIBRARY_DIR:PATH="$(pkg-config --variable=libdir
libffi)" \
>>>     -DLLVM_BINUTILS_INCDIR=/usr/include \
>>>     -DLLVM_LIBDIR_SUFFIX=64 \
>>>     -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
>>>     -DLIBUNWIND_ENABLE_SHARED=ON \
>>>     -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
>>>     -DLLDB_TEST_C_COMPILER=clang \
>>>     -DLLDB_TEST_CXX_COMPILER=clang++ \
>>>     -DLLVM_DEFAULT_TARGET_TRIPLE="x86_64-redhat-linux" \
>>>     -DCLANG_VENDOR="LLVM China"
>>> 
>>> 4. $ clang -v
>>> LLVM China clang version 8.0.0 (git at
github.com:llvm-mirror/clang.git 81ef98628ebf5186d746c0986dcbf5073e842043) (git
at github.com:llvm-mirror/llvm.git e1aac9723d55497e74d83d216329f08d9842e494)
(based on LLVM 8.0.0svn)
>>> Target: x86_64-redhat-linux
>>> Thread model: posix
>>> InstalledDir: /usr/bin
>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-redhat-linux/6.4.1
>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>> Found candidate GCC installation:
/usr/lib/gcc/i686-redhat-linux/6.4.1
>>> Found candidate GCC installation:
/usr/lib/gcc/x86_64-redhat-linux/6.4.1
>>> Selected GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>> Candidate multilib: .;@m64
>>> Candidate multilib: 32;@m32
>>> Selected multilib: .;@m64
>>> 
>>> --
>>> Regards,
>>> Leslie Zhai
>>> 
>>> 
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> llvm-dev at lists.llvm.org
>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> 
> --
> Regards,
> Leslie Zhai
> 
> 
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Leslie Zhai via llvm-dev

2018-Sep-11 16:09 UTC

head link

[llvm-dev] OpenJDK8 failed to work after compiled by LLVM 8 for X86

Hi Dimitry,

Thank you so much for the reduced testcase!  It is able to reproduce 
after compiled with clang-8 optimized for X86:

$ clang++ -O3 -S -c JDK-8205969.cpp -o JDK-8205969-opt-8.0.s
$ clang++ -O3 -c JDK-8205969.cpp -o JDK-8205969-opt-8.0.o
$ clang++ -o JDK-8205969-opt-8.0.out JDK-8205969-opt-8.0.o

$ ./JDK-8205969-opt-8.0.out
Segmentation fault

$ cat JDK-8205969-opt-8.0.s
         .text
         .file   "JDK-8205969.cpp"
         .globl  main                    # -- Begin function main
         .p2align        4, 0x90
         .type   main, at function
main:                                   # @main
         .cfi_startproc
# %bb.0:
         xorps   %xmm0, %xmm0
         movups  %xmm0, _ZN15NativeCallStack11EMPTY_STACKE+16(%rip)
         movups  %xmm0, _ZN15NativeCallStack11EMPTY_STACKE(%rip)
         xorl    %eax, %eax
         retq
.Lfunc_end0:
         .size   main, .Lfunc_end0-main
         .cfi_endproc
                                         # -- End function
         .type   _ZN15NativeCallStack11EMPTY_STACKE, at object # 
@_ZN15NativeCallStack11EMPTY_STACKE
         .section        .rodata,"a", at progbits

                              ^--- READ-ONLY segment

         .globl  _ZN15NativeCallStack11EMPTY_STACKE
         .p2align        3
_ZN15NativeCallStack11EMPTY_STACKE:
         .zero   32
         .size   _ZN15NativeCallStack11EMPTY_STACKE, 32


         .ident  "LLVM China clang version 8.0.0 
(git at github.com:llvm-mirror/clang.git 
81ef98628ebf5186d746c0986dcbf5073e842043) 
(git at github.com:llvm-mirror/llvm.git 
e1aac9723d55497e74d83d216329f08d9842e494) (based on LLVM 8.0.0svn)"
         .section        ".note.GNU-stack","", at progbits
         .addrsig

But it is *not* able to reproduce with clang-8 not optimized for X86:

$ clang++ -O0 -S -c JDK-8205969.cpp -o JDK-8205969-unopt-8.0.s
$ clang++ -O0 -c JDK-8205969.cpp -o JDK-8205969-unopt-8.0.o
$ clang++ -o JDK-8205969-unopt-8.0.out JDK-8205969-unopt-8.0.o

$ ./JDK-8205969-unopt-8.0.out

No segfault

$ cat JDK-8205969-unopt-8.0.s
         .text
         .file   "JDK-8205969.cpp"
         .section        .text.startup,"ax", at progbits
         .p2align        4, 0x90         # -- Begin function 
__cxx_global_var_init
         .type   __cxx_global_var_init, at function
__cxx_global_var_init:                  # @__cxx_global_var_init
         .cfi_startproc
# %bb.0:
         pushq   %rbp
         .cfi_def_cfa_offset 16
         .cfi_offset %rbp, -16
         movq    %rsp, %rbp
         .cfi_def_cfa_register %rbp
         movabsq $_ZN15NativeCallStack11EMPTY_STACKE, %rdi
         callq   _ZN15NativeCallStackC2Ev
         popq    %rbp
         .cfi_def_cfa %rsp, 8
         retq
.Lfunc_end0:
         .size   __cxx_global_var_init, .Lfunc_end0-__cxx_global_var_init
         .cfi_endproc
                                         # -- End function
         .section 
.text._ZN15NativeCallStackC2Ev,"axG", at
progbits,_ZN15NativeCallStackC2Ev,comdat
         .weak   _ZN15NativeCallStackC2Ev # -- Begin function 
_ZN15NativeCallStackC2Ev
         .p2align        4, 0x90
         .type   _ZN15NativeCallStackC2Ev, at function
_ZN15NativeCallStackC2Ev:               # @_ZN15NativeCallStackC2Ev
         .cfi_startproc
# %bb.0:
         pushq   %rbp
         .cfi_def_cfa_offset 16
         .cfi_offset %rbp, -16
         movq    %rsp, %rbp
         .cfi_def_cfa_register %rbp
         movq    %rdi, -8(%rbp)
         movq    -8(%rbp), %rdi
         movl    $0, -12(%rbp)
         movq    %rdi, -24(%rbp)         # 8-byte Spill
.LBB1_1:                                # =>This Inner Loop Header: Depth=1
         cmpl    $4, -12(%rbp)
         jge     .LBB1_4
# %bb.2:                                #   in Loop: Header=BB1_1 Depth=1
         movslq  -12(%rbp), %rax
         movq    -24(%rbp), %rcx         # 8-byte Reload
         movq    $0, (%rcx,%rax,8)
# %bb.3:                                #   in Loop: Header=BB1_1 Depth=1
         movl    -12(%rbp), %eax
         addl    $1, %eax
         movl    %eax, -12(%rbp)
         jmp     .LBB1_1
.LBB1_4:
         popq    %rbp
         .cfi_def_cfa %rsp, 8
         retq
.Lfunc_end1:
         .size   _ZN15NativeCallStackC2Ev, 
.Lfunc_end1-_ZN15NativeCallStackC2Ev
         .cfi_endproc
                                         # -- End function
         .text
         .globl  main                    # -- Begin function main
         .p2align        4, 0x90
         .type   main, at function
main:                                   # @main
         .cfi_startproc
# %bb.0:
         pushq   %rbp
         .cfi_def_cfa_offset 16
         .cfi_offset %rbp, -16
         movq    %rsp, %rbp
         .cfi_def_cfa_register %rbp
         subq    $16, %rsp
         movl    $0, -4(%rbp)
         movabsq $_ZN15NativeCallStack11EMPTY_STACKE, %rdi
         callq   _ZN15NativeCallStackC2Ev
         xorl    %eax, %eax
         addq    $16, %rsp
         popq    %rbp
         .cfi_def_cfa %rsp, 8
         retq
.Lfunc_end2:
         .size   main, .Lfunc_end2-main
         .cfi_endproc
                                         # -- End function
         .section        .text.startup,"ax", at progbits
         .p2align        4, 0x90         # -- Begin function 
_GLOBAL__sub_I_JDK_8205969.cpp
         .type   _GLOBAL__sub_I_JDK_8205969.cpp, at function
_GLOBAL__sub_I_JDK_8205969.cpp:         # @_GLOBAL__sub_I_JDK_8205969.cpp
         .cfi_startproc
# %bb.0:
         pushq   %rbp
         .cfi_def_cfa_offset 16
         .cfi_offset %rbp, -16
         movq    %rsp, %rbp
         .cfi_def_cfa_register %rbp
         callq   __cxx_global_var_init
         popq    %rbp
         .cfi_def_cfa %rsp, 8
         retq
.Lfunc_end3:
         .size   _GLOBAL__sub_I_JDK_8205969.cpp, 
.Lfunc_end3-_GLOBAL__sub_I_JDK_8205969.cpp
         .cfi_endproc
                                         # -- End function
         .type   _ZN15NativeCallStack11EMPTY_STACKE, at object # 
@_ZN15NativeCallStack11EMPTY_STACKE
         .bss

         ^--- R/W segment

         .globl  _ZN15NativeCallStack11EMPTY_STACKE
         .p2align        3
_ZN15NativeCallStack11EMPTY_STACKE:
         .zero   32
         .size   _ZN15NativeCallStack11EMPTY_STACKE, 32

         .section        .init_array,"aw", at init_array
         .p2align        3
         .quad   _GLOBAL__sub_I_JDK_8205969.cpp

         .ident  "LLVM China clang version 8.0.0 
(git at github.com:llvm-mirror/clang.git 
81ef98628ebf5186d746c0986dcbf5073e842043) 
(git at github.com:llvm-mirror/llvm.git 
e1aac9723d55497e74d83d216329f08d9842e494) (based on LLVM 8.0.0svn)"
         .section        ".note.GNU-stack","", at progbits
         .addrsig
         .addrsig_sym __cxx_global_var_init
         .addrsig_sym _GLOBAL__sub_I_JDK_8205969.cpp
         .addrsig_sym _ZN15NativeCallStack11EMPTY_STACKE

----- 8< -------- 8< -------- 8< -------- 8< -------- 8< --------
8< ---

Furthermore clang-3.9.1 *optimized* for X86 is *not* able to reproduce 
the issue neither.  It behaviors like gcc-6.4.1 and gcc-8.  But I will 
also check out clang-8 -O3/-O0 for mips64el.

And I am building LLVM 5.0.2 for X86,  if still *not* able to 
reproduce,  it might be reduced the issue to [6, +∞) version range.  I 
will dig deep-into which commit/review bring in the issue.


在 2018年09月11日 16:55, Dimitry Andric 写道:> Hi Leslie,
>
> The problem really lies in the OpenJDK code, as it is attempting to
> write to a const object.  If this seems to work with certain compiler(s)
> and optimization settings, it is just luck. :-)
>
> Here is a reduced example, which shows the issue:
>
> =====================================================================>
#include <new>
>
> class NativeCallStack {
> public:
>    static const NativeCallStack EMPTY_STACK;
>
> private:
>    enum { DEPTH = 4 };
>    void* stack[DEPTH];
>
> public:
>    NativeCallStack() {
>      for (int i = 0; i < DEPTH; ++i) {
>        stack[i] = nullptr;
>      }
>    }
> };
>
> const NativeCallStack NativeCallStack::EMPTY_STACK;
>
> int main(void)
> {
>    // The following should segfault, if EMPTY_STACK was placed into
.rodata.
>    ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack();
>    return 0;
> }
> =====================================================================>
> clang 7.0.0 rc2 produces this assembly:
>
>          .globl  main                    # -- Begin function main
>          .p2align        4, 0x90
>          .type   main, at function
> main:                                   # @main
>          .cfi_startproc
> # %bb.0:                                # %entry
>          pushq   %rbp
>          .cfi_def_cfa_offset 16
>          .cfi_offset %rbp, -16
>          movq    %rsp, %rbp
>          .cfi_def_cfa_register %rbp
>          xorps   %xmm0, %xmm0
>          movups  %xmm0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movups  %xmm0, NativeCallStack::EMPTY_STACK(%rip)
>          xorl    %eax, %eax
>          popq    %rbp
>          .cfi_def_cfa %rsp, 8
>          retq
> .Lfunc_end0:
>          .size   main, .Lfunc_end0-main
>          .cfi_endproc
>                                          # -- End function
>          .type   NativeCallStack::EMPTY_STACK, at object #
@NativeCallStack::EMPTY_STACK
>          .section        .rodata,"a", at progbits
>          .globl  NativeCallStack::EMPTY_STACK
>          .p2align        3
> NativeCallStack::EMPTY_STACK:
>          .zero   32
>          .size   NativeCallStack::EMPTY_STACK, 32
>
> The whole constructor has been optimized out, and EMPTY_STACK has been
> replaced by .zero 32, placed in the .rodata segment, which is a
> perfectly valid transformation.
>
> Then, in main(), an attempt is made to write to that read-only segment,
> which will usually segfault, depending on how strictly the underlying
> operating system enforces these protections.
>
> In contrast, gcc 8.2.0 produces:
>
>          .globl  main
>          .type   main, @function
> main:
> .LFB74:
>          .cfi_startproc
>          movq    $0, NativeCallStack::EMPTY_STACK(%rip)
>          xorl    %eax, %eax
>          movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
>          ret
>          .cfi_endproc
> .LFE74:
>          .size   main, .-main
>          .p2align 4,,15
>          .type   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE,
@function
> _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE:
> .LFB76:
>          .cfi_startproc
>          movq    $0, NativeCallStack::EMPTY_STACK(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
>          ret
>          .cfi_endproc
> .LFE76:
>          .size   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE,
.-_GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
>          .section        .ctors,"aw", at progbits
>          .align 8
>          .quad   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
>          .globl  NativeCallStack::EMPTY_STACK
>          .bss
>          .align 32
>          .type   NativeCallStack::EMPTY_STACK, @object
>          .size   NativeCallStack::EMPTY_STACK, 32
> NativeCallStack::EMPTY_STACK:
>          .zero   32
>
> Here you can see that gcc decided to not place EMPTY_STACK in .rodata,
> but in .bss, which is read/write.  It adds the global constructor to
> the .ctors section, so the dynamic linker is made responsible for
> calling it.
>
> Note that now the EMPTY_STACK object is unnecessarily initialized twice,
> once by the global constructor, and once in main.
>
> -Dimitry
>
>> On 11 Sep 2018, at 03:38, Leslie Zhai <zhaixiang at loongson.cn>
wrote:
>>
>> Hi Dimitry,
>>
>> Thanks for your kind response!
>>
>> Thanks for the commit message of Jung's patch,  I found that the
bug had been fixed in OpenJDK 12 by Zhengyu
https://bugs.openjdk.java.net/browse/JDK-8205965  But only backported to 11.  So
Jung could backport it for OpenJDK 8, thanks a lot!
>>
>> But I argue that the root cause might be in the compiler side, why
clang-3.9.1, gcc-6.4.1 couldn't reproduce the bug?  And it might be work for
clang-4.0 https://bugs.openjdk.java.net/browse/JDK-8208494  I will test LLVM 5
to check out whether or not reproducible.
>>
>>
>> 在 2018年09月11日 00:59, Dimitry Andric 写道:
>>> Hi Leslie,
>>>
>>> This is likely the same problem as was reported in
https://bugs.freebsd.org/225054#c8, and fixed by the following patch:
>>>
>>>
https://svnweb.freebsd.org/ports/head/java/openjdk8/files/patch-hotspot_src_share_vm_services_memTracker.cpp?view=markup&pathrev=459368
>>>
>>> Can you please try that out, and see if it fixes it for you too?
>>>
>>> -Dimitry
>>>
>>>> On 10 Sep 2018, at 18:20, Leslie Zhai via llvm-dev <llvm-dev
at lists.llvm.org> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> OpenJDK8 jdk8u-dev[1] is just able to work after compiled with
LLVM 3.9.1 for X86:
>>>>
>>>> $
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java
-version
>>>> openjdk version "1.8.0-internal-debug"
>>>> OpenJDK Runtime Environment (build
1.8.0-internal-debug-xiangzhai_2018_09_09_21_08-b00)
>>>> OpenJDK 64-Bit Server VM (build 25.71-b00-debug, mixed mode)
>>>>
>>>> $ strings
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java | grep
clang
>>>> clang version 3.9.1 (tags/RELEASE_391/final)
>>>>
>>>> But it failed to work after compiled with LLVM 8 for X86:
>>>>
>>>> $
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> Segmentation fault
>>>>
>>>> $ gdb --ex run --args
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> GNU gdb (GDB) Fedora 7.12.1-48.fc25
>>>> ...
>>>> Starting program:
/home/xiangzhai/project/jdk8u-llvm/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> [Thread debugging using libthread_db enabled]
>>>> Using host libthread_db library
"/lib64/libthread_db.so.1".
>>>>
>>>> Program received signal SIGSEGV, Segmentation fault.
>>>> [ Legend: Modified register | Code | Heap | Stack | String ]
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────[
registers ]────
>>>> $rax   : 0x0
>>>> $rbx   : 0x0
>>>> $rcx   : 0x7ffff7315eb0      →  0x00007ffff6ae30a0  →
<NativeCallStack::print_on(outputStream*)+0> xor edx, edx
>>>> $rdx   : 0x0
>>>> $rsp   : 0x7fffffff9328      →  0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx
>>>> $rbp   : 0x7fffffff93c0      →  0x00007fffffff94f0  →
0x00007fffffff9510  →  0x0000000000000002
>>>> $rsi   : 0x0
>>>> $rdi   : 0x7ffff7315e70      →  0x00007ffff7315eb0  →
0x00007ffff6ae30a0  → <NativeCallStack::print_on(outputStream*)+0> xor
edx, edx
>>>> $rip   : 0x7ffff6ae2f5b      →
<NativeCallStack::NativeCallStack(int,+0> mov QWORD PTR [rdi], rcx
>>>> $r8    : 0x1
>>>> $r9    : 0xf
>>>> $r10   : 0x64
>>>> $r11   : 0x0
>>>> $r12   : 0x7fffffffdc88      →  0x00007fffffffe04c  →
"/home/xiangzhai/project/jdk8u-llvm/build/linux-x86[...]"
>>>> $r13   : 0x7fffffffdca0      →  0x00007fffffffe0bf  →
"XDG_VTNR=1"
>>>> $r14   : 0x7fffffff9330      →  "NMT_LEVEL_10535"
>>>> $r15   : 0x6
>>>> $eflags: [carry parity adjust zero sign trap INTERRUPT
direction overflow RESUME virtualx86 identification]
>>>> $ss: 0x002b  $ds: 0x0000  $cs: 0x0033  $es: 0x0000  $gs: 0x0000
$fs: 0x0000
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
stack ]────
>>>> 0x00007fffffff9328│+0x00: 0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx    ← $rsp
>>>> 0x00007fffffff9330│+0x08: "NMT_LEVEL_10535"      ←
$r14
>>>> 0x00007fffffff9338│+0x10: 0x0035333530315f4c
("L_10535"?)
>>>> 0x00007fffffff9340│+0x18: 0x0000000000000001
>>>> 0x00007fffffff9348│+0x20: 0x0000000000602190  →
0x00007ffff5eb7000  →  0x00010102464c457f
>>>> 0x00007fffffff9350│+0x28: 0x0000000000000004
>>>> 0x00007fffffff9358│+0x30: 0x000000066474e551
>>>> 0x00007fffffff9360│+0x38: 0x0000000000000000
>>>>
────────────────────────────────────────────────────────────────────────────────────────[
code:i386:x86-64 ]────
>>>>     0x7ffff6ae2f4b
<print_owned_locks_on_error(outputStream*)+187> add    eax, 0x1f0f00
>>>>     0x7ffff6ae2f50
<NativeCallStack::NativeCallStack(int,+0> mov    rcx, QWORD PTR
[rip+0x842781]        # 0x7ffff73256d8
>>>>     0x7ffff6ae2f57
<NativeCallStack::NativeCallStack(int,+0> add    rcx, 0x10
>>>>   → 0x7ffff6ae2f5b
<NativeCallStack::NativeCallStack(int,+0> mov    QWORD PTR [rdi], rcx
>>>>     0x7ffff6ae2f5e
<NativeCallStack::NativeCallStack(int,+0> mov    DWORD PTR [rdi+0x28], 0x0
>>>>     0x7ffff6ae2f65
<NativeCallStack::NativeCallStack(int,+0> add    rdi, 0x8
>>>>     0x7ffff6ae2f69
<NativeCallStack::NativeCallStack(int,+0> test   edx, edx
>>>>     0x7ffff6ae2f6b
<NativeCallStack::NativeCallStack(int,+0> je     0x7ffff6ae2f7b
<NativeCallStack::NativeCallStack(int, bool)+43>
>>>>     0x7ffff6ae2f6d
<NativeCallStack::NativeCallStack(int,+0> mov    eax, esi
>>>> ─────────[
source:/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp+33
]────
>>>>       28  #include "utilities/nativeCallStack.hpp"
>>>>       29
>>>>       30  const NativeCallStack NativeCallStack::EMPTY_STACK(0,
false);
>>>>       31
>>>>       32  NativeCallStack::NativeCallStack(int toSkip, bool
fillStack) :
>>>>   →   33    _hash_value(0) {
>>>>       34
>>>>       35  #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
>>>>       36    fillStack = false;
>>>>       37  #endif
>>>>       38
>>>>
─────────────────────────────────────────────────────────────────────────────────────────────────[
threads ]────
>>>> [#0] Id 1, Name: "java", stopped, reason: SIGSEGV
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
trace ]────
>>>> [#0] 0x7ffff6ae2f5b → Name:
NativeCallStack::NativeCallStack(this=0x7ffff7315e70
<NativeCallStack::EMPTY_STACK>, toSkip=0x0, fillStack=0x0)
>>>> [#1] 0x7ffff6a76822 → Name: MemTracker::init_tracking_level()
>>>> [#2] 0x7ffff62eff49 → Name: MemTracker::tracking_level()
>>>> [#3] 0x7ffff62eff49 → Name: ResourceObj::operator
new(size=0x20, type=ResourceObj::STACK_OR_EMBEDDED, flags=<optimized out>)
>>>> [#4] 0x7ffff61369ec → Name: _GLOBAL__sub_I_c1_Greedy.cpp()
>>>> [#5] 0x7ffff7de7d9a → Name: call_init(l=<optimized out>,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>>> [#6] 0x7ffff7de7eab → Name: call_init(env=0x7fffffffdca0,
argv=0x7fffffffdc88, argc=0x2, l=<optimized out>)
>>>> [#7] 0x7ffff7de7eab → Name: _dl_init(main_map=0x602190,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>>> [#8] 0x7ffff7dece46 → Name: dl_open_worker(a=0x7fffffff97e0)
>>>> [#9] 0x7ffff7de7c44 → Name:
_dl_catch_error(objname=0x7fffffff97d0, errstring=0x7fffffff97d8,
mallocedp=0x7fffffff97cf, operate=0x7ffff7decae0 <dl_open_worker>,
args=0x7fffffff97e0)
>>>>
────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>>>> 0x00007ffff6ae2f5b in NativeCallStack::NativeCallStack
(this=0x7ffff7315e70 <NativeCallStack::EMPTY_STACK>, toSkip=0x0,
fillStack=0x0) at
/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp:33
>>>> 33        _hash_value(0) {
>>>> gef➤  c
>>>> Continuing.
>>>>
>>>> Program terminated with signal SIGSEGV, Segmentation fault.
>>>> The program no longer exists.
>>>> gef➤
>>>>
>>>> ----- 8< -------- 8< -------- 8< -------- 8<
-------- 8< -------- 8< ---
>>>>
>>>> I started to use and contribute clang static analyzer[2] just
for finding the bugs for open source software from LLVM 3.x,  perhaps it is a
bug of LLVM 8,  because jdk8u is just able to print out '-version' after
compiled with llvm-3.9.1,  I will rebuild the LLVM 8 again,  then rebuild jdk8u
for triple check.
>>>>
>>>> 1. Workaround-compile-with-llvm.patch
https://raw.githubusercontent.com/xiangzhai/jdk8u-dev/master/Workaround-compile-with-llvm.patch
>>>>
>>>> 2.
https://github.com/llvm-mirror/clang/commit/a530e823ed2793ac149de7a984014e242a787682#diff-ff9160d4628cb9b6186559837c2c8668
>>>>
>>>> 3. The build option of LLVM 8 (bootstrap with LLVM 3.9.1):
>>>>
>>>> cmake .. -DCMAKE_BUILD_TYPE=Release \
>>>>      -DCMAKE_C_COMPILER=clang \
>>>>      -DCMAKE_CXX_COMPILER=clang++ \
>>>>      -DCMAKE_C_FLAGS="-fPIC" \
>>>>      -DCMAKE_CXX_FLAGS="-std=c++11 -fPIC" \
>>>>      -DLLVM_BUILD_LLVM_DYLIB=ON \
>>>>      -DLLVM_LINK_LLVM_DYLIB=ON \
>>>>      -DLLVM_INSTALL_UTILS=ON \
>>>>      -DLLVM_ENABLE_RTTI=ON \
>>>>      -DLLVM_ENABLE_FFI=ON \
>>>>      -DLLVM_ENABLE_EH=ON \
>>>>      -DLLVM_BUILD_TESTS=ON \
>>>>      -DLLVM_BUILD_DOCS=OFF \
>>>>      -DLLVM_ENABLE_SPHINX=OFF \
>>>>      -DLLVM_ENABLE_DOXYGEN=OFF \
>>>>      -DLLDB_DISABLE_LIBEDIT=1 \
>>>>      -DSPHINX_WARNINGS_AS_ERRORS=OFF \
>>>>      -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir
libffi) \
>>>>      -DFFI_LIBRARY_DIR:PATH="$(pkg-config
--variable=libdir libffi)" \
>>>>      -DLLVM_BINUTILS_INCDIR=/usr/include \
>>>>      -DLLVM_LIBDIR_SUFFIX=64 \
>>>>      -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
>>>>      -DLIBUNWIND_ENABLE_SHARED=ON \
>>>>      -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
>>>>      -DLLDB_TEST_C_COMPILER=clang \
>>>>      -DLLDB_TEST_CXX_COMPILER=clang++ \
>>>>     
-DLLVM_DEFAULT_TARGET_TRIPLE="x86_64-redhat-linux" \
>>>>      -DCLANG_VENDOR="LLVM China"
>>>>
>>>> 4. $ clang -v
>>>> LLVM China clang version 8.0.0 (git at
github.com:llvm-mirror/clang.git 81ef98628ebf5186d746c0986dcbf5073e842043) (git
at github.com:llvm-mirror/llvm.git e1aac9723d55497e74d83d216329f08d9842e494)
(based on LLVM 8.0.0svn)
>>>> Target: x86_64-redhat-linux
>>>> Thread model: posix
>>>> InstalledDir: /usr/bin
>>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/lib/gcc/i686-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Selected GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Candidate multilib: .;@m64
>>>> Candidate multilib: 32;@m32
>>>> Selected multilib: .;@m64
>>>>
>>>> --
>>>> Regards,
>>>> Leslie Zhai
>>>>
>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> llvm-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> --
>> Regards,
>> Leslie Zhai
>>
>>
-- 
Regards,
Leslie Zhai

Leslie Zhai via llvm-dev

2018-Sep-12 11:10 UTC

head link

[llvm-dev] OpenJDK8 failed to work after compiled by LLVM 8 for X86

Reported https://bugs.llvm.org/show_bug.cgi?id=38911

Thanks,

Leslie Zhai


在 2018年09月11日 16:55, Dimitry Andric 写道:> Hi Leslie,
>
> The problem really lies in the OpenJDK code, as it is attempting to
> write to a const object.  If this seems to work with certain compiler(s)
> and optimization settings, it is just luck. :-)
>
> Here is a reduced example, which shows the issue:
>
> =====================================================================>
#include <new>
>
> class NativeCallStack {
> public:
>    static const NativeCallStack EMPTY_STACK;
>
> private:
>    enum { DEPTH = 4 };
>    void* stack[DEPTH];
>
> public:
>    NativeCallStack() {
>      for (int i = 0; i < DEPTH; ++i) {
>        stack[i] = nullptr;
>      }
>    }
> };
>
> const NativeCallStack NativeCallStack::EMPTY_STACK;
>
> int main(void)
> {
>    // The following should segfault, if EMPTY_STACK was placed into
.rodata.
>    ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack();
>    return 0;
> }
> =====================================================================>
> clang 7.0.0 rc2 produces this assembly:
>
>          .globl  main                    # -- Begin function main
>          .p2align        4, 0x90
>          .type   main, at function
> main:                                   # @main
>          .cfi_startproc
> # %bb.0:                                # %entry
>          pushq   %rbp
>          .cfi_def_cfa_offset 16
>          .cfi_offset %rbp, -16
>          movq    %rsp, %rbp
>          .cfi_def_cfa_register %rbp
>          xorps   %xmm0, %xmm0
>          movups  %xmm0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movups  %xmm0, NativeCallStack::EMPTY_STACK(%rip)
>          xorl    %eax, %eax
>          popq    %rbp
>          .cfi_def_cfa %rsp, 8
>          retq
> .Lfunc_end0:
>          .size   main, .Lfunc_end0-main
>          .cfi_endproc
>                                          # -- End function
>          .type   NativeCallStack::EMPTY_STACK, at object #
@NativeCallStack::EMPTY_STACK
>          .section        .rodata,"a", at progbits
>          .globl  NativeCallStack::EMPTY_STACK
>          .p2align        3
> NativeCallStack::EMPTY_STACK:
>          .zero   32
>          .size   NativeCallStack::EMPTY_STACK, 32
>
> The whole constructor has been optimized out, and EMPTY_STACK has been
> replaced by .zero 32, placed in the .rodata segment, which is a
> perfectly valid transformation.
>
> Then, in main(), an attempt is made to write to that read-only segment,
> which will usually segfault, depending on how strictly the underlying
> operating system enforces these protections.
>
> In contrast, gcc 8.2.0 produces:
>
>          .globl  main
>          .type   main, @function
> main:
> .LFB74:
>          .cfi_startproc
>          movq    $0, NativeCallStack::EMPTY_STACK(%rip)
>          xorl    %eax, %eax
>          movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
>          ret
>          .cfi_endproc
> .LFE74:
>          .size   main, .-main
>          .p2align 4,,15
>          .type   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE,
@function
> _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE:
> .LFB76:
>          .cfi_startproc
>          movq    $0, NativeCallStack::EMPTY_STACK(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+8(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+16(%rip)
>          movq    $0, NativeCallStack::EMPTY_STACK+24(%rip)
>          ret
>          .cfi_endproc
> .LFE76:
>          .size   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE,
.-_GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
>          .section        .ctors,"aw", at progbits
>          .align 8
>          .quad   _GLOBAL__sub_I__ZN15NativeCallStack11EMPTY_STACKE
>          .globl  NativeCallStack::EMPTY_STACK
>          .bss
>          .align 32
>          .type   NativeCallStack::EMPTY_STACK, @object
>          .size   NativeCallStack::EMPTY_STACK, 32
> NativeCallStack::EMPTY_STACK:
>          .zero   32
>
> Here you can see that gcc decided to not place EMPTY_STACK in .rodata,
> but in .bss, which is read/write.  It adds the global constructor to
> the .ctors section, so the dynamic linker is made responsible for
> calling it.
>
> Note that now the EMPTY_STACK object is unnecessarily initialized twice,
> once by the global constructor, and once in main.
>
> -Dimitry
>
>> On 11 Sep 2018, at 03:38, Leslie Zhai <zhaixiang at loongson.cn>
wrote:
>>
>> Hi Dimitry,
>>
>> Thanks for your kind response!
>>
>> Thanks for the commit message of Jung's patch,  I found that the
bug had been fixed in OpenJDK 12 by Zhengyu
https://bugs.openjdk.java.net/browse/JDK-8205965  But only backported to 11.  So
Jung could backport it for OpenJDK 8, thanks a lot!
>>
>> But I argue that the root cause might be in the compiler side, why
clang-3.9.1, gcc-6.4.1 couldn't reproduce the bug?  And it might be work for
clang-4.0 https://bugs.openjdk.java.net/browse/JDK-8208494  I will test LLVM 5
to check out whether or not reproducible.
>>
>>
>> 在 2018年09月11日 00:59, Dimitry Andric 写道:
>>> Hi Leslie,
>>>
>>> This is likely the same problem as was reported in
https://bugs.freebsd.org/225054#c8, and fixed by the following patch:
>>>
>>>
https://svnweb.freebsd.org/ports/head/java/openjdk8/files/patch-hotspot_src_share_vm_services_memTracker.cpp?view=markup&pathrev=459368
>>>
>>> Can you please try that out, and see if it fixes it for you too?
>>>
>>> -Dimitry
>>>
>>>> On 10 Sep 2018, at 18:20, Leslie Zhai via llvm-dev <llvm-dev
at lists.llvm.org> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> OpenJDK8 jdk8u-dev[1] is just able to work after compiled with
LLVM 3.9.1 for X86:
>>>>
>>>> $
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java
-version
>>>> openjdk version "1.8.0-internal-debug"
>>>> OpenJDK Runtime Environment (build
1.8.0-internal-debug-xiangzhai_2018_09_09_21_08-b00)
>>>> OpenJDK 64-Bit Server VM (build 25.71-b00-debug, mixed mode)
>>>>
>>>> $ strings
./build/linux-x86_64-normal-server-slowdebug/images/j2sdk-image/bin/java | grep
clang
>>>> clang version 3.9.1 (tags/RELEASE_391/final)
>>>>
>>>> But it failed to work after compiled with LLVM 8 for X86:
>>>>
>>>> $
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> Segmentation fault
>>>>
>>>> $ gdb --ex run --args
./build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> GNU gdb (GDB) Fedora 7.12.1-48.fc25
>>>> ...
>>>> Starting program:
/home/xiangzhai/project/jdk8u-llvm/build/linux-x86_64-normal-server-fastdebug/images/j2sdk-image/bin/java
-version
>>>> [Thread debugging using libthread_db enabled]
>>>> Using host libthread_db library
"/lib64/libthread_db.so.1".
>>>>
>>>> Program received signal SIGSEGV, Segmentation fault.
>>>> [ Legend: Modified register | Code | Heap | Stack | String ]
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────[
registers ]────
>>>> $rax   : 0x0
>>>> $rbx   : 0x0
>>>> $rcx   : 0x7ffff7315eb0      →  0x00007ffff6ae30a0  →
<NativeCallStack::print_on(outputStream*)+0> xor edx, edx
>>>> $rdx   : 0x0
>>>> $rsp   : 0x7fffffff9328      →  0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx
>>>> $rbp   : 0x7fffffff93c0      →  0x00007fffffff94f0  →
0x00007fffffff9510  →  0x0000000000000002
>>>> $rsi   : 0x0
>>>> $rdi   : 0x7ffff7315e70      →  0x00007ffff7315eb0  →
0x00007ffff6ae30a0  → <NativeCallStack::print_on(outputStream*)+0> xor
edx, edx
>>>> $rip   : 0x7ffff6ae2f5b      →
<NativeCallStack::NativeCallStack(int,+0> mov QWORD PTR [rdi], rcx
>>>> $r8    : 0x1
>>>> $r9    : 0xf
>>>> $r10   : 0x64
>>>> $r11   : 0x0
>>>> $r12   : 0x7fffffffdc88      →  0x00007fffffffe04c  →
"/home/xiangzhai/project/jdk8u-llvm/build/linux-x86[...]"
>>>> $r13   : 0x7fffffffdca0      →  0x00007fffffffe0bf  →
"XDG_VTNR=1"
>>>> $r14   : 0x7fffffff9330      →  "NMT_LEVEL_10535"
>>>> $r15   : 0x6
>>>> $eflags: [carry parity adjust zero sign trap INTERRUPT
direction overflow RESUME virtualx86 identification]
>>>> $ss: 0x002b  $ds: 0x0000  $cs: 0x0033  $es: 0x0000  $gs: 0x0000
$fs: 0x0000
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
stack ]────
>>>> 0x00007fffffff9328│+0x00: 0x00007ffff6a76822  →
<MemTracker::init_tracking_level()+178> mov edi, ebx    ← $rsp
>>>> 0x00007fffffff9330│+0x08: "NMT_LEVEL_10535"      ←
$r14
>>>> 0x00007fffffff9338│+0x10: 0x0035333530315f4c
("L_10535"?)
>>>> 0x00007fffffff9340│+0x18: 0x0000000000000001
>>>> 0x00007fffffff9348│+0x20: 0x0000000000602190  →
0x00007ffff5eb7000  →  0x00010102464c457f
>>>> 0x00007fffffff9350│+0x28: 0x0000000000000004
>>>> 0x00007fffffff9358│+0x30: 0x000000066474e551
>>>> 0x00007fffffff9360│+0x38: 0x0000000000000000
>>>>
────────────────────────────────────────────────────────────────────────────────────────[
code:i386:x86-64 ]────
>>>>     0x7ffff6ae2f4b
<print_owned_locks_on_error(outputStream*)+187> add    eax, 0x1f0f00
>>>>     0x7ffff6ae2f50
<NativeCallStack::NativeCallStack(int,+0> mov    rcx, QWORD PTR
[rip+0x842781]        # 0x7ffff73256d8
>>>>     0x7ffff6ae2f57
<NativeCallStack::NativeCallStack(int,+0> add    rcx, 0x10
>>>>   → 0x7ffff6ae2f5b
<NativeCallStack::NativeCallStack(int,+0> mov    QWORD PTR [rdi], rcx
>>>>     0x7ffff6ae2f5e
<NativeCallStack::NativeCallStack(int,+0> mov    DWORD PTR [rdi+0x28], 0x0
>>>>     0x7ffff6ae2f65
<NativeCallStack::NativeCallStack(int,+0> add    rdi, 0x8
>>>>     0x7ffff6ae2f69
<NativeCallStack::NativeCallStack(int,+0> test   edx, edx
>>>>     0x7ffff6ae2f6b
<NativeCallStack::NativeCallStack(int,+0> je     0x7ffff6ae2f7b
<NativeCallStack::NativeCallStack(int, bool)+43>
>>>>     0x7ffff6ae2f6d
<NativeCallStack::NativeCallStack(int,+0> mov    eax, esi
>>>> ─────────[
source:/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp+33
]────
>>>>       28  #include "utilities/nativeCallStack.hpp"
>>>>       29
>>>>       30  const NativeCallStack NativeCallStack::EMPTY_STACK(0,
false);
>>>>       31
>>>>       32  NativeCallStack::NativeCallStack(int toSkip, bool
fillStack) :
>>>>   →   33    _hash_value(0) {
>>>>       34
>>>>       35  #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
>>>>       36    fillStack = false;
>>>>       37  #endif
>>>>       38
>>>>
─────────────────────────────────────────────────────────────────────────────────────────────────[
threads ]────
>>>> [#0] Id 1, Name: "java", stopped, reason: SIGSEGV
>>>>
───────────────────────────────────────────────────────────────────────────────────────────────────[
trace ]────
>>>> [#0] 0x7ffff6ae2f5b → Name:
NativeCallStack::NativeCallStack(this=0x7ffff7315e70
<NativeCallStack::EMPTY_STACK>, toSkip=0x0, fillStack=0x0)
>>>> [#1] 0x7ffff6a76822 → Name: MemTracker::init_tracking_level()
>>>> [#2] 0x7ffff62eff49 → Name: MemTracker::tracking_level()
>>>> [#3] 0x7ffff62eff49 → Name: ResourceObj::operator
new(size=0x20, type=ResourceObj::STACK_OR_EMBEDDED, flags=<optimized out>)
>>>> [#4] 0x7ffff61369ec → Name: _GLOBAL__sub_I_c1_Greedy.cpp()
>>>> [#5] 0x7ffff7de7d9a → Name: call_init(l=<optimized out>,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>>> [#6] 0x7ffff7de7eab → Name: call_init(env=0x7fffffffdca0,
argv=0x7fffffffdc88, argc=0x2, l=<optimized out>)
>>>> [#7] 0x7ffff7de7eab → Name: _dl_init(main_map=0x602190,
argc=0x2, argv=0x7fffffffdc88, env=0x7fffffffdca0)
>>>> [#8] 0x7ffff7dece46 → Name: dl_open_worker(a=0x7fffffff97e0)
>>>> [#9] 0x7ffff7de7c44 → Name:
_dl_catch_error(objname=0x7fffffff97d0, errstring=0x7fffffff97d8,
mallocedp=0x7fffffff97cf, operate=0x7ffff7decae0 <dl_open_worker>,
args=0x7fffffff97e0)
>>>>
────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>>>> 0x00007ffff6ae2f5b in NativeCallStack::NativeCallStack
(this=0x7ffff7315e70 <NativeCallStack::EMPTY_STACK>, toSkip=0x0,
fillStack=0x0) at
/home/xiangzhai/project/jdk8u-llvm/hotspot/src/share/vm/utilities/nativeCallStack.cpp:33
>>>> 33        _hash_value(0) {
>>>> gef➤  c
>>>> Continuing.
>>>>
>>>> Program terminated with signal SIGSEGV, Segmentation fault.
>>>> The program no longer exists.
>>>> gef➤
>>>>
>>>> ----- 8< -------- 8< -------- 8< -------- 8<
-------- 8< -------- 8< ---
>>>>
>>>> I started to use and contribute clang static analyzer[2] just
for finding the bugs for open source software from LLVM 3.x,  perhaps it is a
bug of LLVM 8,  because jdk8u is just able to print out '-version' after
compiled with llvm-3.9.1,  I will rebuild the LLVM 8 again,  then rebuild jdk8u
for triple check.
>>>>
>>>> 1. Workaround-compile-with-llvm.patch
https://raw.githubusercontent.com/xiangzhai/jdk8u-dev/master/Workaround-compile-with-llvm.patch
>>>>
>>>> 2.
https://github.com/llvm-mirror/clang/commit/a530e823ed2793ac149de7a984014e242a787682#diff-ff9160d4628cb9b6186559837c2c8668
>>>>
>>>> 3. The build option of LLVM 8 (bootstrap with LLVM 3.9.1):
>>>>
>>>> cmake .. -DCMAKE_BUILD_TYPE=Release \
>>>>      -DCMAKE_C_COMPILER=clang \
>>>>      -DCMAKE_CXX_COMPILER=clang++ \
>>>>      -DCMAKE_C_FLAGS="-fPIC" \
>>>>      -DCMAKE_CXX_FLAGS="-std=c++11 -fPIC" \
>>>>      -DLLVM_BUILD_LLVM_DYLIB=ON \
>>>>      -DLLVM_LINK_LLVM_DYLIB=ON \
>>>>      -DLLVM_INSTALL_UTILS=ON \
>>>>      -DLLVM_ENABLE_RTTI=ON \
>>>>      -DLLVM_ENABLE_FFI=ON \
>>>>      -DLLVM_ENABLE_EH=ON \
>>>>      -DLLVM_BUILD_TESTS=ON \
>>>>      -DLLVM_BUILD_DOCS=OFF \
>>>>      -DLLVM_ENABLE_SPHINX=OFF \
>>>>      -DLLVM_ENABLE_DOXYGEN=OFF \
>>>>      -DLLDB_DISABLE_LIBEDIT=1 \
>>>>      -DSPHINX_WARNINGS_AS_ERRORS=OFF \
>>>>      -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir
libffi) \
>>>>      -DFFI_LIBRARY_DIR:PATH="$(pkg-config
--variable=libdir libffi)" \
>>>>      -DLLVM_BINUTILS_INCDIR=/usr/include \
>>>>      -DLLVM_LIBDIR_SUFFIX=64 \
>>>>      -DLIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON \
>>>>      -DLIBUNWIND_ENABLE_SHARED=ON \
>>>>      -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
>>>>      -DLLDB_TEST_C_COMPILER=clang \
>>>>      -DLLDB_TEST_CXX_COMPILER=clang++ \
>>>>     
-DLLVM_DEFAULT_TARGET_TRIPLE="x86_64-redhat-linux" \
>>>>      -DCLANG_VENDOR="LLVM China"
>>>>
>>>> 4. $ clang -v
>>>> LLVM China clang version 8.0.0 (git at
github.com:llvm-mirror/clang.git 81ef98628ebf5186d746c0986dcbf5073e842043) (git
at github.com:llvm-mirror/llvm.git e1aac9723d55497e74d83d216329f08d9842e494)
(based on LLVM 8.0.0svn)
>>>> Target: x86_64-redhat-linux
>>>> Thread model: posix
>>>> InstalledDir: /usr/bin
>>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/i686-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/lib/gcc/i686-redhat-linux/6.4.1
>>>> Found candidate GCC installation:
/usr/lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Selected GCC installation:
/usr/bin/../lib/gcc/x86_64-redhat-linux/6.4.1
>>>> Candidate multilib: .;@m64
>>>> Candidate multilib: 32;@m32
>>>> Selected multilib: .;@m64
>>>>
>>>> --
>>>> Regards,
>>>> Leslie Zhai
>>>>
>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> llvm-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> --
>> Regards,
>> Leslie Zhai
>>
>>

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