[cfe-users] Address Sanitizer SEGV

[Alexey Samsonov]

Hi Pedro!

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:
>
> ASAN:SIGSEGV
> =================================================================
> ==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
> /build/buildd/eglibc-2.17/nptl/pthread_attr_destroy.c:41
>     #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
> /build/buildd/eglibc-2.17/nptl/pthread_create.c:311
>     #8 0x2b3f320c79cc in clone
> /build/buildd/eglibc-2.17/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:113
> 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*)
> /home/ppinto/external/tbb/tbb41_20130314oss/build/linux_intel64_gcc_cc4.1.2_libc2.5_kernel3.2.0_debug/../../src/tbb/tbb_thread.cpp:130
>
> ....
> ==23580==ABORTING
>
> 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,
> -pp
>
> $ clang --version
> Ubuntu clang version 3.4-1ubuntu1 (trunk) (based on LLVM 3.4)
> Target: x86_64-pc-linux-gnu
> Thread model: posix
>
>
>
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-- 
Alexey Samsonov, MSK