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author | Jay Foad <jay.foad@gmail.com> | 2015-06-27 08:39:12 +0000 |
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committer | Jay Foad <jay.foad@gmail.com> | 2015-06-27 08:39:12 +0000 |
commit | 1078594d5500eaa6b7bd82019cb2a4c8103dbb35 (patch) | |
tree | cfda496aa2c3d05d1d460a217183c9f5d67b3bc6 /lib/tsan/rtl/tsan_suppressions.h | |
parent | 43c73a07ba2e400a76b174cbe09daba329921de3 (diff) | |
download | compiler-rt-1078594d5500eaa6b7bd82019cb2a4c8103dbb35.tar.gz |
[msan] Fix infinite recursion when _Unwind_Backtrace calls memcpy
Summary:
On PPC64, half the msan tests fail with an infinite recursion through
GetStackTrace like this:
#0 __msan::GetStackTrace
#1 __msan_memcpy
#2 ?? () from /lib64/libgcc_s.so.1
#3 ?? () from /lib64/libgcc_s.so.1
#4 _Unwind_Backtrace
#5 __sanitizer::BufferedStackTrace::SlowUnwindStack
#6 __sanitizer::BufferedStackTrace::Unwind
#7 __msan::GetStackTrace
#8 __interceptor_calloc
#9 _dl_allocate_tls
#10 pthread_create@@GLIBC_2.17
#11 __interceptor_pthread_create
#12 main
The problem is that we call _Unwind_Backtrace to get a stack trace; but
_Unwind_Backtrace calls memcpy, which we intercept and try to get
another stack trace.
This patch fixes it in __msan_memcpy by skipping the stack trace if
IsInSymbolizer(). This works because GetStackTrace already creates a
SymbolizerScope to "block reports from our interceptors during
_Unwind_Backtrace".
Reviewers: samsonov, wschmidt, eugenis
Reviewed By: eugenis
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D10762
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@240878 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/tsan/rtl/tsan_suppressions.h')
0 files changed, 0 insertions, 0 deletions