Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 255 by [email protected]: Forking threads fails with
clang 3.4
http://code.google.com/p/address-sanitizer/issues/detail?id=255
I don't know what exactly is the source of the issue. I have a program that
performs the following steps:
* fork 4 threads
* fork a new process
* fork 4 threads in the new process
The parent process performs some work before this that involves:
* (un)poisoning some memory
* handling some segv
Forking the new threads in the child process ends with the following errors
(in every single thread):
=================================================================
==8377==ERROR: AddressSanitizer: stack-buffer-overflow on address
0x7f9922ffdf28 at pc 0x4606d1 bp 0x7f9922ffdf00 sp 0x7f9922ffded8
WRITE of size 8 at 0x7f9922ffdf28 thread T7
==8377==AddressSanitizer: while reporting a bug found another one.Ignoring.
==8377==AddressSanitizer: while reporting a bug found another one.Ignoring.
#0 0x4606d0 in __interceptor_pthread_attr_getstack
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:2549
#1 0x48d28a in __sanitizer::GetThreadStackTopAndBottom(bool, unsigned
long*, unsigned long*)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:77
#2 0x48d65d in __sanitizer::GetThreadStackAndTls(bool, unsigned long*,
unsigned long*, unsigned long*, unsigned long*)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:248
#3 0x484ab3 in SetThreadStackAndTls
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:184
#4 0x484ab3 in __asan::AsanThread::Init()
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:142
#5 0x484cff in __asan::AsanThread::ThreadStart(unsigned long)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:157
#6 0x7f99296c8e0d in start_thread
/home/aurel32/eglibc/eglibc-2.17/nptl/pthread_create.c:311
#7 0x7f99287900fc (/lib/x86_64-linux-gnu/libc.so.6+0xe90fc)
==8377==AddressSanitizer CHECK failed:
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:231 "((ptr[0]
== kCurrentStackFrameMagic)) != (0)" (0x0, 0x0)
#0 0x4838ff in __asan::AsanCheckFailed(char const*, int, char const*,
unsigned long long, unsigned long long)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_rtl.cc:66
#1 0x489161 in __sanitizer::CheckFailed(char const*, int, char const*,
unsigned long long, unsigned long long)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_common.cc:69
#2 0x484f7e in __asan::AsanThread::GetFrameNameByAddr(unsigned long,
unsigned long*, unsigned long*)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:206
#3 0x48048f in __asan::DescribeAddressIfStack(unsigned long, unsigned
long)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_report.cc:317
#4 0x480edc in __asan::DescribeAddress(unsigned long, unsigned long)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_report.cc:466
#5 0x481d01 in __asan_report_error
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_report.cc:775
#6 0x4606ee in __interceptor_pthread_attr_getstack
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc:2549
#7 0x48d28a in __sanitizer::GetThreadStackTopAndBottom(bool, unsigned
long*, unsigned long*)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:77
#8 0x48d65d in __sanitizer::GetThreadStackAndTls(bool, unsigned long*,
unsigned long*, unsigned long*, unsigned long*)
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc:248
#9 0x484ab3 in SetThreadStackAndTls
/home/fruneau/dev/tools/llvm_3.4/projects/compiler-rt/lib/asan/asan_thread.cc:184
This has been tested with clang 3.4 and compiler-rt revision 197381 (branch
release_34). The issue does not occur with clang 3.3. I can provide more
details if needed.
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