[cfe-users] Address Sanitizer SEGV
samsonov at google.com
Mon Nov 25 23:43:55 PST 2013
Yes, this is most likely the problem in ASan (ASan stack unwinder uses
pointers to stack top/bottom in a given thread, and these
pointers are not yet initialized in your case). Can you make a
standalone reproducer for this issue?
I'll take a look at the code to see if we can properly fix it, or at
least add a workaround.
(side note: once again we are hit by calling functions from libpthread
in GetThreadStackTopAndBottom, sigh).
On Tue, Nov 26, 2013 at 3:01 AM, pedro pinto <pedro.e.pinto at gmail.com> wrote:
> Hi there,
> I just started running address sanitize AddressSanitizer and I received a
> report that I am having trouble parsing:
> ==23580==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
> 0x2b3f29713a90 sp 0x2b3f3b526450 bp 0x2b3f3b526ca0 T38)
> AddressSanitizer can not provide additional info.
> #0 0x2b3f29713a8f in __sanitizer::StackTrace::FastUnwindStack(unsigned
> long, unsigned long, unsigned long, unsigned long) ??:?
> #1 0x2b3f29704dac in free ??:?
> #2 0x2b3f3118f8ac in __pthread_attr_destroy
> #3 0x2b3f29711917 in __sanitizer::GetThreadStackTopAndBottom(bool,
> unsigned long*, unsigned long*) ??:?
> #4 0x2b3f29711d8d in __sanitizer::GetThreadStackAndTls(bool, unsigned
> long*, unsigned long*, unsigned long*, unsigned long*) ??:?
> #5 0x2b3f2970b72d in __asan::AsanThread::Init() ??:?
> #6 0x2b3f2970b98f in __asan::AsanThread::ThreadStart(unsigned long) ??:?
> #7 0x2b3f3118df6d in start_thread
> #8 0x2b3f320c79cc in clone
> Thread T38 created by T0 here:
> #0 0x2b3f296fa7eb in __interceptor_pthread_create ??:?
> #1 0x2b3f301edd67 in tbb::internal::tbb_thread_v3::internal_start(void*
> (*)(void*), void*)
> Seems like the top of the stack was within Address Sanitizer itself, does
> this indicate a bug in sanitizer or am I missing something here?
> Thanks in advance,
> $ clang --version
> Ubuntu clang version 3.4-1ubuntu1 (trunk) (based on LLVM 3.4)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
> cfe-users mailing list
> cfe-users at cs.uiuc.edu
Alexey Samsonov, MSK
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