[PATCH] D46277: [libFuzzer] Report at most one crash per input.

[Matt Morehouse via Phabricator via llvm-commits]

morehouse created this revision.
morehouse added a reviewer: kcc.
Herald added a subscriber: kubamracek.

Fixes https://github.com/google/sanitizers/issues/788/, a deadlock
caused by multiple crashes happening at the same time.  Before printing
a crash report, we now test and set an atomic flag.  If the flag was
already set, the crash handler returns immediately.


https://reviews.llvm.org/D46277

Files:
  compiler-rt/lib/asan/asan_report.cc
  compiler-rt/lib/fuzzer/FuzzerExtFunctions.def
  compiler-rt/lib/fuzzer/FuzzerLoop.cpp
  compiler-rt/lib/fuzzer/FuzzerTracePC.cpp
  compiler-rt/lib/sanitizer_common/sanitizer_common.cc
  compiler-rt/lib/sanitizer_common/sanitizer_common_interface.inc
  compiler-rt/lib/sanitizer_common/sanitizer_interface_internal.h
  compiler-rt/lib/sanitizer_common/weak_symbols.txt
  compiler-rt/test/fuzzer/AcquireCrashStateTest.cpp
  compiler-rt/test/fuzzer/acquire-crash-state.test

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