[cfe-users] Address Sanitizer SEGV
kcc at google.com
Mon Nov 25 23:48:09 PST 2013
does this happen with the fresh clang trunk?
On Tue, Nov 26, 2013 at 11:43 AM, Alexey Samsonov <samsonov at google.com>wrote:
> 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>
> > 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
> > 0x2b3f29713a90 sp 0x2b3f3b526450 bp 0x2b3f3b526ca0 T38)
> > AddressSanitizer can not provide additional info.
> > #0 0x2b3f29713a8f in
> > 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
> > Thread T38 created by T0 here:
> > #0 0x2b3f296fa7eb in __interceptor_pthread_create ??:?
> > #1 0x2b3f301edd67 in
> > (*)(void*), void*)
> > ....
> > ==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
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