On Tue, Nov 26, 2013 at 11:43 AM, Alexey Samsonov <[email protected]> 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?
Correction: this shouldn't happen, as stack boundaries are initialized with zeroes, so FastUnwindStack should exit early. > 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 <[email protected]> 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 >> >> >> >> _______________________________________________ >> cfe-users mailing list >> [email protected] >> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-users >> > > > > -- > Alexey Samsonov, MSK -- Alexey Samsonov, MSK _______________________________________________ cfe-users mailing list [email protected] http://lists.cs.uiuc.edu/mailman/listinfo/cfe-users
