https://llvm.org/bugs/show_bug.cgi?id=25735
Bug ID: 25735
Summary: llvm::cl::ParseCommandLineOptions casue double free or
corruption when in multithread
Product: libraries
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: xiuli...@outlook.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
We are using clang as a frontend, and we tried to use it in multithread, but
the llvm::cl::ParseCommandLineOptions will cause
double free or corruption (fasttop): 0x00007f36e40041d0 ***
dump core backtrace shows that:
(gdb) bt
#0 0x00007f478493bf79 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f478493f388 in __GI_abort () at abort.c:89
#2 0x00007f4784f416b5 in __gnu_cxx::__verbose_terminate_handler() ()
from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#3 0x00007f4784f3f836 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#4 0x00007f4784f3f863 in std::terminate() () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#5 0x00007f4784f4033f in __cxa_pure_virtual () from
/usr/lib/x86_64-linux-gnu/libstdc++.so.6
#6 0x00007f4780ca6885 in llvm::cl::Option::addOccurrence (this=0x7f47829a0c20
<InlineLimit>, pos=1,
ArgName=..., Value=..., MultiArg=false) at
/home/pxl/llvm/lib/Support/CommandLine.cpp:1140
#7 0x00007f4780ca1942 in CommaSeparateAndAddOccurrence (Handler=0x7f47829a0c20
<InlineLimit>, pos=1,
ArgName=..., Value=..., MultiArg=false) at
/home/pxl/llvm/lib/Support/CommandLine.cpp:348
#8 0x00007f4780ca1c1e in ProvideOption (Handler=0x7f47829a0c20 <InlineLimit>,
ArgName=..., Value=...,
argc=2, argv=0x7f477af6c3b8, i=@0x7f477af6bc98: 1) at
/home/pxl/llvm/lib/Support/CommandLine.cpp:389
#9 0x00007f4780ca4f25 in (anonymous
namespace)::CommandLineParser::ParseCommandLineOptions (
this=0x19d0160, argc=2, argv=0x7f477af6c3b8, Overview=0x0)
at /home/pxl/llvm/lib/Support/CommandLine.cpp:990
#10 0x00007f4780ca3c18 in llvm::cl::ParseCommandLineOptions (argc=2,
argv=0x7f475c004680, Overview=0x0)
at /home/pxl/llvm/lib/Support/CommandLine.cpp:813
This bug does not happen in LLVM3.6, it seems the ParseCommandLineOptions was
refined and it is wrapped by a static manager:
[CommandLine.cpp]
00213 static ManagedStatic<CommandLineParser> GlobalParser;
00811 void cl::ParseCommandLineOptions(int argc, const char *const *argv,
00812 const char *Overview) {
00813 GlobalParser->ParseCommandLineOptions(argc, argv, Overview);
00814 }
And this static manager make each thread using the same CommandLineParser
object and cause this error.
May be the GlobalParser should be a TLS to make sure it is a thread safe as
other llvm component.
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