Comment #6 on issue 361 by [email protected]: ThreadSanitizer reports dubious
practices in V8
http://code.google.com/p/v8/issues/detail?id=361
One more report which I haven't seen before.
Looks like the profiling thread touches Logger::current_state_ and other
objects w/o synchronization.
WARNING: Possible data race during write of size 4 at 0x86F7F94: {{{
T0 (locks held: {}):
#0 v8::internal::VMState::~VMState() /home/kcc/v8/v8/src/log-inl.h:99
#1 v8::internal::Invoke /home/kcc/v8/v8/src/execution.cc:115
#2 v8::internal::Execution::Call /home/kcc/v8/v8/src/execution.cc:124
#3 v8::internal::Genesis::CompileScriptCached
/home/kcc/v8/v8/src/bootstrapper.cc:844
#4 v8::internal::Genesis::CompileNative
/home/kcc/v8/v8/src/bootstrapper.cc:795
#5 v8::internal::Genesis::CompileBuiltin
/home/kcc/v8/v8/src/bootstrapper.cc:785
#6 v8::internal::Genesis::InstallNatives
/home/kcc/v8/v8/src/bootstrapper.cc:1064
#7 v8::internal::Genesis::Genesis
/home/kcc/v8/v8/src/bootstrapper.cc:1472
#8 v8::internal::Bootstrapper::CreateEnvironment
/home/kcc/v8/v8/src/bootstrapper.cc:279
#9 v8::Context::New /home/kcc/v8/v8/src/api.cc:2950
#10 /home/kcc/v8/v8/test/cctest/test-log.cc:178
#11 TestLogCallbacks /home/kcc/v8/v8/test/cctest/test-log.cc:533
Concurrent read these points:
T1 :
#0 v8::internal::Logger::state /home/kcc/v8/v8/src/log.h:264
#1 v8::internal::ProfilerSignalHandler
/home/kcc/v8/v8/src/platform-linux.cc:732
#2 sem_wait@@GLIBC_2.1 /lib32/libpthread-2.7.so
#3 sem_w...@* /tmp/tsan/drt/tsan/ts_valgrind_intercepts.c:1727
#4 v8::internal::LinuxSemaphore::Wait
/home/kcc/v8/v8/src/platform-linux.cc:612
#5 v8::internal::Profiler::Remove /home/kcc/v8/v8/src/log.cc:101
#6 v8::internal::Profiler::Run /home/kcc/v8/v8/src/log.cc:314
#7 v8::internal::ThreadEntry /home/kcc/v8/v8/src/platform-linux.cc:512
#8 ThreadSanitizerStartThread
/tmp/tsan/drt/tsan/ts_valgrind_intercepts.c:553
Address 0x86F7F94 is 0 bytes inside data
symbol "_ZN2v88internal6Logger14current_state_E"
}}}
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