[llvm-dev] DW_TAG_member extends beyond the bounds error on Linux

David Blaikie via llvm-dev
Sun, 27 Mar 2016 03:22:32 -0000

If you're going to use clang built binaries with lldb, you'll want to
pass
-fstandalone-debug - this is the default on platforms where lldb is the
primary debugger (Darwin and freebsd)

Not sure if that is the problem you are seeing, but will be a problem
sooner or later
On Mar 26, 2016 4:16 PM, "Jeffrey Tan via llvm-dev" <llvm-dev at
lists.llvm.org>
wrote:

> Hi,
>
> While dogfooding our lldb based IDE on Linux, I am seeing a lot of
> variable evaluation errors related to DW_TAG_member which prevents us from
> release the IDE. Can anyone help to confirm if they are known issues? If
> not, any information you need to troubleshoot this issue?
>
> Here is one example:
>
> (lldb) fr v
> *error: biggrep_master_server_async 0x10b9a91a: DW_TAG_member
> '_M_pod_data' refers to type 0x10bb1e99 which extends beyond the
bounds of
> 0x10b9a901*
> *error: biggrep_master_server_async 0x10b98edc: DW_TAG_member
'small_'
> refers to type 0x10bb1d9f which extends beyond the bounds of 0x10b98ed3*
> *error: biggrep_master_server_async 0x10baf034: DW_TAG_member
'__size'
> refers to type 0x10baf04d which extends beyond the bounds of 0x10baefae*
> (facebook::biggrep::BigGrepMasterAsync *) this = 0x00007fd14d374fd0
> (const string &const) corpus = error: summary string parsing error: {
>   store_ = {
>      = {
>       small_ = {}
>       *ml_ = (data_ >
"��UH\x89�H�}�H\x8bE�]ÐUH\x89�H��H\x89}�H\x8bE�H\x89��~\xb4��\x90��UH\x89�SH\x83�H\x89}�H�u�H�E�H���\x9e���H\x8b\x18H\x8bE�H���O\xb4��H\x89ƿ\b",
> size_ = 0, capacity_ = 1441151880758558720)*
>     }
>   }
> }
> *(const string &const) needle = error: summary string parsing error: {*
>   store_ = {
>      = {
>       small_ = {}
>       ml_ = (data_ = "", size_ = 0, capacity_ =
1080863910568919040)
>     }
>   }
> }
> (facebook::biggrep::Options &) options = 0x00007fd133cfb7b0: {
>   engine = error: summary string parsing error
>   full_lines = true
>   user = error: summary string parsing error
>   max_bytes = 5000000
>   leading_context = 0
>   trailing_context = 0
>   case_sensitive = true
>   client_hostname = error: summary string parsing error
>   client_ip = error: summary string parsing error
>   skip_logging = false
>   client_port = 0
>   shards_override = 0
>   sample = false
>   count = false
>   filename_pattern = error: summary string parsing error
>   limit = 0
>   __isset = {
>     engine = true
>     full_lines = true
>     user = true
>     max_bytes = true
>     leading_context = true
>     trailing_context = true
>     case_sensitive = true
>     client_hostname = true
>     client_ip = true
>     skip_logging = true
>     client_port = true
>     shards_override = true
>     sample = true
>     count = true
>     filename_pattern = true
>     limit = true
>   }
> }
> (size_t) recv_timeout = 140536468041728
> (std::vector<std::basic_fbstring<char, std::char_traits<char>,
> std::allocator<char>, std::fbstring_core<char> >,
> std::allocator<std::basic_fbstring<char,
std::char_traits<char>,
> std::allocator<char>, std::fbstring_core<char> > > >)
corpuses = size=0 {}
> (std::vector<facebook::biggrep::BigGrepMasterAsync::Revision,
> std::allocator<facebook::biggrep::BigGrepMasterAsync::Revision> >)
> revisions = size=0 {}
> (std::vector<facebook::biggrep::BigGrepMasterAsync::RevisionShard,
> std::allocator<facebook::biggrep::BigGrepMasterAsync::RevisionShard>
>)
> shards = size=0 {}
> *(std::string) returnRev = error: summary string parsing error*
> (<lambda(folly::StringPiece)>) quote = {}
> (std::basic_fbstring<char, std::char_traits<char>,
std::allocator<char>,
> std::fbstring_core<char> >) desc = {
>   store_ = {
>      = {
>       small_ = {}
>       ml_ = (data_ = "", size_ = 73415312, capacity_ =
140536494141696)
>     }
>   }
> }
> (folly::EventBase *) eb = 0x00007fd133cfb888
> (apache::thrift::concurrency::ThreadManager *) tm = 0x00007fd133cfb570
>
> I suspect each one may be different root cause. I was able to capture one
> callstack of a small repro:
>
> Breakpoint 1, DWARFASTParserClang::ParseChildMembers (this=0x8c4520,
> sc=..., parent_die=..., class_clang_type=...,
> class_language=lldb::eLanguageTypeUnknown,
>     base_classes=..., member_accessibilities=...,
> member_function_dies=..., delayed_properties=...,
>     default_accessibility=@0x7ffdf3888cac: lldb::eAccessPublic,
> is_a_class=@0x7ffdf3888cab: false, layout_info=...)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2937
> 2937
>    parent_die.GetID());
> (gdb) bt
> #0  0x00007f103d02533d in
> DWARFASTParserClang::ParseChildMembers(lldb_private::SymbolContext
const&,
> DWARFDIE const&, lldb_private::CompilerType&, lldb::LanguageType,
> std::vector<clang::CXXBaseSpecifier*,
> std::allocator<clang::CXXBaseSpecifier*> >&,
std::vector<int,
> std::allocator<int> >&, DWARFDIECollection&,
> std::vector<DWARFASTParserClang::DelayedAddObjCClassProperty,
> std::allocator<DWARFASTParserClang::DelayedAddObjCClassProperty>
>&,
> lldb::AccessType&, bool&, DWARFASTParserClang::LayoutInfo&)
(this=0x8c4520,
> sc=..., parent_die=..., class_clang_type=...,
> class_language=lldb::eLanguageTypeUnknown, base_classes=...,
> member_accessibilities=..., member_function_dies=...,
> delayed_properties=..., default_accessibility=@0x7ffdf3888cac:
> lldb::eAccessPublic, is_a_class=@0x7ffdf3888cab: false, layout_info=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2937
> #1  0x00007f103d025b84 in
> DWARFASTParserClang::CompleteTypeFromDWARF(DWARFDIE const&,
> lldb_private::Type*, lldb_private::CompilerType&) (this=0x8c4520,
die=...,
> type=0xc40a50, clang_type=...)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/DWARFASTParserClang.cpp:2036
> #2  0x00007f103d04c5e8 in
> SymbolFileDWARF::CompleteType(lldb_private::CompilerType&)
(this=<optimized
> out>, compiler_type=...)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp:1635
> #3  0x00007f103ceff9da in
> lldb_private::ClangASTContext::CompleteTagDecl(void*, clang::TagDecl*)
> (baton=<optimized out>, decl=0xc41bc0)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:9619
> #4  0x00007f103cf03400 in GetCompleteQualType(clang::ASTContext*,
> clang::QualType, bool) (ast=0x7f102c020c30, qual_type=...,
> allow_completion=allow_completion at entry=true) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:2632
> #5  0x00007f103cf0c99e in
> lldb_private::ClangASTContext::GetNumChildren(void*, bool) (this=0x8c43c0,
> type=<optimized out>, omit_empty_base_classes=<optimized out>)
at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/ClangASTContext.cpp:5067
> #6  0x00007f103ce876ad in
> lldb_private::ValueObjectVariable::CalculateNumChildren(unsigned int)
> (this=<optimized out>, max=4294967295)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObjectVariable.cpp:102
> #7  0x00007f103ce7759f in
> lldb_private::ValueObject::GetNumChildren(unsigned int) (this=0xc40600,
> max=4294967295)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObject.cpp:778
> #8  0x00007f103cd999bd in
>
lldb_private::FormatManager::ShouldPrintAsOneLiner(lldb_private::ValueObject&)
> (this=this at entry=0x7f103fe2f300
<GetFormatManager()::g_format_manager>,
> valobj=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/FormatManager.cpp:576
> #9  0x00007f103cd9226a in
>
lldb_private::DataVisualization::ShouldPrintAsOneLiner(lldb_private::ValueObject&)
> (valobj=...)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/DataVisualization.cpp:42
> #10 0x00007f103cdc2167 in
> lldb_private::ValueObjectPrinter::PrintChildrenIfNeeded(bool, bool)
> (this=this at entry=0x7ffdf38892a0, value_printed=<optimized out>,
> summary_printed=<optimized out>) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/ValueObjectPrinter.cpp:869
> #11 0x00007f103cdc1572 in
> lldb_private::ValueObjectPrinter::PrintValueObject() (this=this at entry
> =0x7ffdf38892a0)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/DataFormatters/ValueObjectPrinter.cpp:111
> #12 0x00007f103ce7102f in
> lldb_private::ValueObject::Dump(lldb_private::Stream&,
> lldb_private::DumpValueObjectOptions const&) (this=this at
entry=0xc40600,
> s=..., options=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ValueObject.cpp:3585
> #13 0x00007f103d27e5e4 in
> CommandObjectFrameVariable::DoExecute(lldb_private::Args&,
> lldb_private::CommandReturnObject&) (this=0x7d0590, command=...,
> result=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Commands/CommandObjectFrame.cpp:591
> #14 0x00007f103cece45d in lldb_private::CommandObjectParsed::Execute(char
> const*, lldb_private::CommandReturnObject&) (this=0x7d0590,
> args_string=<optimized out>, result=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandObject.cpp:1095
> #15 0x00007f103cec9559 in
> lldb_private::CommandInterpreter::HandleCommand(char const*,
> lldb_private::LazyBool, lldb_private::CommandReturnObject&,
> lldb_private::ExecutionContext*, bool, bool) (this=this at entry=0x7a5210,
> command_line=<optimized out>, lazy_add_to_history=lazy_add_to_history
at entry=lldb_private::eLazyBoolCalculate,
> result=..., override_context=override_context at entry=0x0,
> repeat_on_empty_command=repeat_on_empty_command at entry=true,
> no_context_switching=false)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:1820
> #16 0x00007f103ceca50d in
>
lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
> std::string&) (this=0x7a5210, io_handler=..., line=...) at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Interpreter/CommandInterpreter.cpp:2976
> #17 0x00007f103ce1c733 in lldb_private::IOHandlerEditline::Run()
> (this=0x87d9b0)
>     at
>
/home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/IOHandler.cpp:736
>
>
> Really appreciate if there is any fix/workaround I can get over this issue
> and unblock us!
>
> Jeffrey
>
> _______________________________________________
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> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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