llvm dev - Apr 2018 - LLD-linked binary segfaults at runtime on alpine linux

Alpine linux is a distribution that uses musl libc instead glibc. Here are
my steps to reproduce:

On Alpine linux, download LLVM, Clang, LLD 6.0.0 from releases.llvm.org,
and build them from source.

$ clang -c hello_world.c
$ ld.lld  --gc-sections -m elf_x86_64 -o hello_world
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
/lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
$ ./hello_world
Segmentation fault (core dumped)

Now try with binutils:
$ ld  --gc-sections -m elf_x86_64 -o hello_world
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
/lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
--no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
$ ./hello_world
Hello, World!


Does the linker line look ok? Should I file a bug?
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Can you add `--reproduce=repro` to lld command line? That generates
repro.tar in your current directory which contains all input files. And
then please compress and upload it somewhere so that we can take a look.


On Mon, Apr 2, 2018 at 9:18 AM Andrew Kelley via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Alpine linux is a distribution that uses musl libc instead glibc. Here are
> my steps to reproduce:
>
> On Alpine linux, download LLVM, Clang, LLD 6.0.0 from releases.llvm.org,
> and build them from source.
>
> $ clang -c hello_world.c
> $ ld.lld  --gc-sections -m elf_x86_64 -o hello_world
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
> /lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
> --no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
> $ ./hello_world
> Segmentation fault (core dumped)
>
> Now try with binutils:
> $ ld  --gc-sections -m elf_x86_64 -o hello_world
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
> /lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
> --no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
> $ ./hello_world
> Hello, World!
>
>
> Does the linker line look ok? Should I file a bug?
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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https://superjoe.s3.amazonaws.com/temp/repro.tar.xz

On Mon, Apr 2, 2018 at 1:26 PM, Rui Ueyama <ruiu at google.com> wrote:
> Can you add `--reproduce=repro` to lld command line? That generates
> repro.tar in your current directory which contains all input files. And
> then please compress and upload it somewhere so that we can take a look.
>
>
> On Mon, Apr 2, 2018 at 9:18 AM Andrew Kelley via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Alpine linux is a distribution that uses musl libc instead glibc. Here
>> are my steps to reproduce:
>>
>> On Alpine linux, download LLVM, Clang, LLD 6.0.0 from
releases.llvm.org,
>> and build them from source.
>>
>> $ clang -c hello_world.c
>> $ ld.lld  --gc-sections -m elf_x86_64 -o hello_world
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
>> /lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
>> --no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
>> $ ./hello_world
>> Segmentation fault (core dumped)
>>
>> Now try with binutils:
>> $ ld  --gc-sections -m elf_x86_64 -o hello_world
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/Scrt1.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crti.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtbegin.o -L
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib -L
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0 -dynamic-linker
>> /lib/../lib/ld-musl-x86_64.so.1 hello_world.o -lgcc --as-needed -lgcc_s
>> --no-as-needed -lc -lm -lgcc --as-needed -lgcc_s --no-as-needed
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/crtend.o
>> /usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../lib/crtn.o
>> $ ./hello_world
>> Hello, World!
>>
>>
>> Does the linker line look ok? Should I file a bug?
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>
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