Status: Unconfirmed
Owner: ----
Labels: Type-Bug Pri-2 OS-All Area-Misc
New issue 23432 by ramosian.glider: A benign data race in
logging::LogMessage::~LogMessage()
http://code.google.com/p/chromium/issues/detail?id=23432
Chrome Version : r27610
ThreadSanitizer bots report a possible benign data race on the global
logging::min_log_level variable (base/logging.cc:51). It is written in
logging::SetMinLogLevel() and read in logging::GetMinLogLevel() and
logging::LogMessage::~LogMessage(), neither of the accessors use any locks.
The data race is observed in ipc_tests when trying to set the logging level
while destroying an instance of LogMessage:
==86150== WARNING: Possible data race during write of size 4 at 0xC140C4:
{{{
==86150== T179 (locks held: {}):
==86150== #0 logging::SetMinLogLevel(int)
src/xcodebuild/Debug/ipc_tests
==86150== #1 (anonymous namespace)::BadServer::Run()
src/xcodebuild/Debug/ipc_tests
==86150== #2 (anonymous namespace)::Worker::OnStart()
src/xcodebuild/Debug/ipc_tests
==86150== #3 void DispatchToMethod<(anonymous namespace)::Worker, void
((anonymous namespace)::Worker::*)()>((anonymous namespace)::Worker*, void
((anonymous namespace)::Worker::*)(), Tuple0 const&)
src/xcodebuild/Debug/ipc_tests
==86150== #4 RunnableMethod<(anonymous namespace)::Worker, void
((anonymous namespace)::Worker::*)(), Tuple0>::Run()
src/xcodebuild/Debug/ipc_tests
==86150== #5 MessageLoop::RunTask(Task*) src/xcodebuild/Debug/ipc_tests
==86150== #6
MessageLoop::DeferOrRunPendingTask(MessageLoop::PendingTask const&)
src/xcodebuild/Debug/ipc_tests
==86150== #7 MessageLoop::DoWork() src/xcodebuild/Debug/ipc_tests
==86150== #8
base::MessagePumpDefault::Run(base::MessagePump::Delegate*)
src/xcodebuild/Debug/ipc_tests
==86150== #9 MessageLoop::RunInternal() src/xcodebuild/Debug/ipc_tests
==86150== #10 MessageLoop::RunHandler() src/xcodebuild/Debug/ipc_tests
==86150== #11 MessageLoop::Run() src/xcodebuild/Debug/ipc_tests
==86150== #12 base::Thread::Run(MessageLoop*)
src/xcodebuild/Debug/ipc_tests
==86150== #13 base::Thread::ThreadMain() src/xcodebuild/Debug/ipc_tests
==86150== #14 ThreadFunc(void*) src/xcodebuild/Debug/ipc_tests
==86150== #15 ThreadSanitizerStartThread
/Users/glider/src/tsan-chromium/valgrind-current/tsan/ts_valgrind_intercepts.c:504
==86150== Concurrent read(s) happened at (OR AFTER) these points:
==86150== T181 (locks held: {}):
==86150== #0 logging::LogMessage::~LogMessage()
src/xcodebuild/Debug/ipc_tests
==86150== #1 logging::LogMessage::~LogMessage()
src/xcodebuild/Debug/ipc_tests
==86150== #2 bool IPC::MessageWithReply<Tuple1<int>, Tuple1<int&>
> ::DispatchDelayReply<(anonymous namespace)::Worker, void ((anonymous
namespace)::Worker::*)(int, IPC::Message*)>(IPC::Message const*, (anonymous
namespace)::Worker*, void ((anonymous namespace)::Worker::*)(int,
IPC::Message*)) src/xcodebuild/Debug/ipc_tests
==86150== #3 (anonymous
namespace)::Worker::OnMessageReceived(IPC::Message const&)
src/xcodebuild/Debug/ipc_tests
==86150== #4
IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&)
src/xcodebuild/Debug/ipc_tests
==86150== #5
IPC::SyncChannel::ReceivedSyncMsgQueue::DispatchMessages()
src/xcodebuild/Debug/ipc_tests
==86150== #6 IPC::SyncChannel::SyncContext::DispatchMessages()
src/xcodebuild/Debug/ipc_tests
==86150== #7
IPC::SyncChannel::OnWaitableEventSignaled(base::WaitableEvent*)
src/xcodebuild/Debug/ipc_tests
==86150== #8 base::AsyncCallbackTask::Run()
src/xcodebuild/Debug/ipc_tests
==86150== #9 MessageLoop::RunTask(Task*) src/xcodebuild/Debug/ipc_tests
This is a benign race that may potentially lead to losing a small amount of
log messages while changing the log level.
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