[lldb-dev] Process::SyncIOHandler(), everyone please try out the following patch
Zachary Turner
zturner at google.com
Thu May 14 20:55:59 PDT 2015
What happens if you export LD_LIBRARY_PATH = wherever the tsan runtime
stuff is installed?
On Thu, May 14, 2015 at 8:35 PM Ryan Brown <ribrdb at google.com> wrote:
> This is on linux. The tests all seem to fail with errors like this:
>
> ImportError:
> /home/ribrdb/llldb/build-tsan/lib/python2.7/site-packages/lldb/_lldb.so:
> undefined symbol: __tsan_init
> Traceback (most recent call last):
> File "/home/ribrdb/llldb/tools/lldb/test/dotest.py", line 1366, in
> <module>
> import lldb
> File
> "/home/ribrdb/llldb/build-tsan/lib/python2.7/site-packages/lldb/__init__.py",
> line 52, in <module>
> _lldb = swig_import_helper()
> File
> "/home/ribrdb/llldb/build-tsan/lib/python2.7/site-packages/lldb/__init__.py",
> line 48, in swig_import_helper
> _mod = imp.load_module('_lldb', fp, pathname, description)
>
>
> On Thu, May 14, 2015 at 5:38 PM Zachary Turner <zturner at google.com> wrote:
>
>> Great results! I'm especially interested in these IOHandler issues, since
>> we know for sure there are problems here.
>>
>> When you say Python can't find tsan, can you elaborate? I'm not sure how
>> tsan works or the process used to run lldb under tsan, but i bet it's
>> something we can figure out with more information.
>>
>> Also, what os is this on?
>> On Thu, May 14, 2015 at 5:01 PM Ryan Brown <ribrdb at google.com> wrote:
>>
>>> I just built lldb with tsan. The tests don't seem to work because python
>>> can't find tsan, but a quick debugging session found a few issues:
>>>
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Write of size 1 at 0x7d4400004bb0 by thread T6:
>>> #0 lldb_private::IOHandler::SetIsDone(bool)
>>> tools/lldb/include/lldb/Core/IOHandler.h:107
>>> #1 lldb_private::Process::PushProcessIOHandler()
>>> tools/lldb/source/Target/Process.cpp:5279
>>> #2
>>> lldb_private::Process::HandlePrivateEvent(std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Target/Process.cpp:4443
>>> #3 lldb_private::Process::RunPrivateStateThread()
>>> tools/lldb/source/Target/Process.cpp:4581
>>> #4 lldb_private::Process::PrivateStateThread(void*)
>>> tools/lldb/source/Target/Process.cpp:4505
>>> #5 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> Previous write of size 1 at 0x7d4400004bb0 by main thread:
>>> #0 lldb_private::IOHandler::SetIsDone(bool)
>>> tools/lldb/include/lldb/Core/IOHandler.h:107
>>> #1 IOHandlerProcessSTDIO::Run()
>>> tools/lldb/source/Target/Process.cpp:5096
>>> #2 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #3 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #4 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #5 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #6 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock)
>>> (pid=64299)
>>> Cycle in lock order graph: M31728 (0x7d1000019e58) => M564
>>> (0x7d680001d0f8) => M31728
>>>
>>> Mutex M564 acquired here while holding mutex M31728 in main thread:
>>> #3 Locker tools/lldb/source/Host/common/Mutex.cpp:114
>>> #4
>>> lldb_private::ModuleList::FindSymbolsWithNameAndType(lldb_private::ConstString
>>> const&, lldb::SymbolType, lldb_private::SymbolContextList&, bool) const
>>> tools/lldb/source/Core/ModuleList.cpp:565
>>> #5 JITLoaderGDB::GetSymbolAddress(lldb_private::ModuleList&,
>>> lldb_private::ConstString const&, lldb::SymbolType) const
>>> tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:432
>>> #6 JITLoaderGDB::SetJITBreakpoint(lldb_private::ModuleList&)
>>> tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:109
>>> #7 JITLoaderGDB::DidLaunch()
>>> tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:84
>>> #8 lldb_private::JITLoaderList::DidLaunch()
>>> tools/lldb/source/Target/JITLoaderList.cpp:60
>>> #9 lldb_private::Process::Launch(lldb_private::ProcessLaunchInfo&)
>>> tools/lldb/source/Target/Process.cpp:3177
>>> #10
>>> lldb_private::platform_linux::PlatformLinux::DebugProcess(lldb_private::ProcessLaunchInfo&,
>>> lldb_private::Debugger&, lldb_private::Target*, lldb_private::Error&)
>>> tools/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp:805
>>> #11 lldb_private::Target::Launch(lldb_private::ProcessLaunchInfo&,
>>> lldb_private::Stream*) tools/lldb/source/Target/Target.cpp:2602
>>> #12 CommandObjectProcessLaunch::DoExecute(lldb_private::Args&,
>>> lldb_private::CommandReturnObject&)
>>> tools/lldb/source/Commands/CommandObjectProcess.cpp:263
>>> #13 lldb_private::CommandObjectParsed::Execute(char const*,
>>> lldb_private::CommandReturnObject&)
>>> tools/lldb/source/Interpreter/CommandObject.cpp:1075
>>> #14 lldb_private::CommandInterpreter::HandleCommand(char const*,
>>> lldb_private::LazyBool, lldb_private::CommandReturnObject&,
>>> lldb_private::ExecutionContext*, bool, bool)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:1812
>>> #15
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:2997
>>> #16 non-virtual thunk to
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:3076
>>> #17 lldb_private::IOHandlerEditline::Run()
>>> tools/lldb/source/Core/IOHandler.cpp:729
>>> #18 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #19 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #20 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #21 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #22 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Mutex M31728 previously acquired by the same thread here:
>>> #3 Locker tools/lldb/source/Host/common/Mutex.cpp:114
>>> #4 lldb_private::JITLoaderList::DidLaunch()
>>> tools/lldb/source/Target/JITLoaderList.cpp:58
>>> #5 lldb_private::Process::Launch(lldb_private::ProcessLaunchInfo&)
>>> tools/lldb/source/Target/Process.cpp:3177
>>> #6
>>> lldb_private::platform_linux::PlatformLinux::DebugProcess(lldb_private::ProcessLaunchInfo&,
>>> lldb_private::Debugger&, lldb_private::Target*, lldb_private::Error&)
>>> tools/lldb/source/Plugins/Platform/Linux/PlatformLinux.cpp:805
>>> #7 lldb_private::Target::Launch(lldb_private::ProcessLaunchInfo&,
>>> lldb_private::Stream*) tools/lldb/source/Target/Target.cpp:2602
>>> #8 CommandObjectProcessLaunch::DoExecute(lldb_private::Args&,
>>> lldb_private::CommandReturnObject&)
>>> tools/lldb/source/Commands/CommandObjectProcess.cpp:263
>>> #9 lldb_private::CommandObjectParsed::Execute(char const*,
>>> lldb_private::CommandReturnObject&)
>>> tools/lldb/source/Interpreter/CommandObject.cpp:1075
>>> #10 lldb_private::CommandInterpreter::HandleCommand(char const*,
>>> lldb_private::LazyBool, lldb_private::CommandReturnObject&,
>>> lldb_private::ExecutionContext*, bool, bool)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:1812
>>> #11
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:2997
>>> #12 non-virtual thunk to
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:3076
>>> #13 lldb_private::IOHandlerEditline::Run()
>>> tools/lldb/source/Core/IOHandler.cpp:729
>>> #14 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #15 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #16 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #17 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #18 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Mutex M31728 acquired here while holding mutex M564 in thread T6:
>>> #3 Locker tools/lldb/source/Host/common/Mutex.cpp:114
>>> #4
>>> lldb_private::JITLoaderList::ModulesDidLoad(lldb_private::ModuleList&)
>>> tools/lldb/source/Target/JITLoaderList.cpp:74
>>> #5 lldb_private::Process::ModulesDidLoad(lldb_private::ModuleList&)
>>> tools/lldb/source/Target/Process.cpp:6466
>>> #6 lldb_private::Target::ModulesDidLoad(lldb_private::ModuleList&)
>>> tools/lldb/source/Target/Target.cpp:1286
>>> #7 lldb_private::Target::ModuleAdded(lldb_private::ModuleList
>>> const&, std::shared_ptr<lldb_private::Module> const&)
>>> tools/lldb/source/Target/Target.cpp:1254
>>> #8 non-virtual thunk to
>>> lldb_private::Target::ModuleAdded(lldb_private::ModuleList const&,
>>> std::shared_ptr<lldb_private::Module> const&)
>>> tools/lldb/source/Target/Target.cpp:1256
>>> #9
>>> lldb_private::ModuleList::AppendImpl(std::shared_ptr<lldb_private::Module>
>>> const&, bool) tools/lldb/source/Core/ModuleList.cpp:111
>>> #10
>>> lldb_private::ModuleList::Append(std::shared_ptr<lldb_private::Module>
>>> const&) tools/lldb/source/Core/ModuleList.cpp:118
>>> #11 lldb_private::Target::GetSharedModule(lldb_private::ModuleSpec
>>> const&, lldb_private::Error*) tools/lldb/source/Target/Target.cpp:1810
>>> #12
>>> lldb_private::DynamicLoader::LoadModuleAtAddress(lldb_private::FileSpec
>>> const&, unsigned long, unsigned long)
>>> tools/lldb/source/Core/DynamicLoader.cpp:185
>>> #13 DynamicLoaderPOSIXDYLD::LoadAllCurrentModules()
>>> tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:530
>>> #14 DynamicLoaderPOSIXDYLD::EntryBreakpointHit(void*,
>>> lldb_private::StoppointCallbackContext*, unsigned long, unsigned long)
>>> tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:343
>>> #15
>>> lldb_private::BreakpointOptions::InvokeCallback(lldb_private::StoppointCallbackContext*,
>>> unsigned long, unsigned long)
>>> tools/lldb/source/Breakpoint/BreakpointOptions.cpp:147
>>> #16
>>> lldb_private::Breakpoint::InvokeCallback(lldb_private::StoppointCallbackContext*,
>>> int) tools/lldb/source/Breakpoint/Breakpoint.cpp:345
>>> #17
>>> lldb_private::BreakpointLocation::InvokeCallback(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocation.cpp:222
>>> #18
>>> lldb_private::BreakpointLocation::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocation.cpp:465
>>> #19
>>> lldb_private::BreakpointLocationCollection::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocationCollection.cpp:144
>>> #20
>>> lldb_private::BreakpointSite::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointSite.cpp:69
>>> #21
>>> lldb_private::StopInfoBreakpoint::ShouldStopSynchronous(lldb_private::Event*)
>>> tools/lldb/source/Target/StopInfo.cpp:200
>>> #22 lldb_private::Thread::ShouldStop(lldb_private::Event*)
>>> tools/lldb/source/Target/Thread.cpp:845
>>> #23 lldb_private::ThreadList::ShouldStop(lldb_private::Event*)
>>> tools/lldb/source/Target/ThreadList.cpp:318
>>> #24
>>> lldb_private::Process::ShouldBroadcastEvent(lldb_private::Event*)
>>> tools/lldb/source/Target/Process.cpp:4181
>>> #25
>>> lldb_private::Process::HandlePrivateEvent(std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Target/Process.cpp:4422
>>> #26 lldb_private::Process::RunPrivateStateThread()
>>> tools/lldb/source/Target/Process.cpp:4581
>>> #27 lldb_private::Process::PrivateStateThread(void*)
>>> tools/lldb/source/Target/Process.cpp:4505
>>> #28
>>> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> Mutex M564 previously acquired by the same thread here:
>>> #3 Locker tools/lldb/source/Host/common/Mutex.cpp:114
>>> #4
>>> lldb_private::ModuleList::AppendImpl(std::shared_ptr<lldb_private::Module>
>>> const&, bool) tools/lldb/source/Core/ModuleList.cpp:108
>>> #5
>>> lldb_private::ModuleList::Append(std::shared_ptr<lldb_private::Module>
>>> const&) tools/lldb/source/Core/ModuleList.cpp:118
>>> #6 lldb_private::Target::GetSharedModule(lldb_private::ModuleSpec
>>> const&, lldb_private::Error*) tools/lldb/source/Target/Target.cpp:1810
>>> #7
>>> lldb_private::DynamicLoader::LoadModuleAtAddress(lldb_private::FileSpec
>>> const&, unsigned long, unsigned long)
>>> tools/lldb/source/Core/DynamicLoader.cpp:185
>>> #8 DynamicLoaderPOSIXDYLD::LoadAllCurrentModules()
>>> tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:530
>>> #9 DynamicLoaderPOSIXDYLD::EntryBreakpointHit(void*,
>>> lldb_private::StoppointCallbackContext*, unsigned long, unsigned long)
>>> tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:343
>>> #10
>>> lldb_private::BreakpointOptions::InvokeCallback(lldb_private::StoppointCallbackContext*,
>>> unsigned long, unsigned long)
>>> tools/lldb/source/Breakpoint/BreakpointOptions.cpp:147
>>> #11
>>> lldb_private::Breakpoint::InvokeCallback(lldb_private::StoppointCallbackContext*,
>>> int) tools/lldb/source/Breakpoint/Breakpoint.cpp:345
>>> #12
>>> lldb_private::BreakpointLocation::InvokeCallback(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocation.cpp:222
>>> #13
>>> lldb_private::BreakpointLocation::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocation.cpp:465
>>> #14
>>> lldb_private::BreakpointLocationCollection::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointLocationCollection.cpp:144
>>> #15
>>> lldb_private::BreakpointSite::ShouldStop(lldb_private::StoppointCallbackContext*)
>>> tools/lldb/source/Breakpoint/BreakpointSite.cpp:69
>>> #16
>>> lldb_private::StopInfoBreakpoint::ShouldStopSynchronous(lldb_private::Event*)
>>> tools/lldb/source/Target/StopInfo.cpp:200
>>> #17 lldb_private::Thread::ShouldStop(lldb_private::Event*)
>>> tools/lldb/source/Target/Thread.cpp:845
>>> #18 lldb_private::ThreadList::ShouldStop(lldb_private::Event*)
>>> tools/lldb/source/Target/ThreadList.cpp:318
>>> #19
>>> lldb_private::Process::ShouldBroadcastEvent(lldb_private::Event*)
>>> tools/lldb/source/Target/Process.cpp:4181
>>> #20
>>> lldb_private::Process::HandlePrivateEvent(std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Target/Process.cpp:4422
>>> #21 lldb_private::Process::RunPrivateStateThread()
>>> tools/lldb/source/Target/Process.cpp:4581
>>> #22 lldb_private::Process::PrivateStateThread(void*)
>>> tools/lldb/source/Target/Process.cpp:4505
>>> #23
>>> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Write of size 1 at 0x7d4400004bb1 by thread T2 (mutexes: write M168):
>>> #0 lldb_private::IOHandler::Deactivate()
>>> tools/lldb/include/lldb/Core/IOHandler.h:131
>>> #1
>>> lldb_private::Debugger::PopIOHandler(std::shared_ptr<lldb_private::IOHandler>
>>> const&) tools/lldb/source/Core/Debugger.cpp:1064
>>> #2 lldb_private::Process::PopProcessIOHandler()
>>> tools/lldb/source/Target/Process.cpp:5291
>>> #3
>>> lldb_private::Debugger::HandleProcessEvent(std::shared_ptr<lldb_private::Event>
>>> const&) tools/lldb/source/Core/Debugger.cpp:1544
>>> #4 lldb_private::Debugger::DefaultEventHandler()
>>> tools/lldb/source/Core/Debugger.cpp:1634
>>> #5 lldb_private::Debugger::EventHandlerThread(void*)
>>> tools/lldb/source/Core/Debugger.cpp:1696
>>> #6 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> Previous write of size 1 at 0x7d4400004bb1 by main thread:
>>> #0 lldb_private::IOHandler::Activate()
>>> tools/lldb/include/lldb/Core/IOHandler.h:125
>>> #1 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:906
>>> #2 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #3 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #4 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #5 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Read of size 8 at 0x7da0000080c0 by thread T2 (mutexes: write M168):
>>> #0 write <null>:0
>>> #1 operator() tools/lldb/source/Host/posix/PipePosix.cpp:416
>>> #2 std::_Function_handler<lldb_private::Error (bool&),
>>> lldb_private::PipePosix::Write(void const*, unsigned long, unsigned
>>> long&)::$_1>::_M_invoke(std::_Any_data const&, bool&)
>>> /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/functional:2056
>>> #3 std::function<lldb_private::Error (bool&)>::operator()(bool&)
>>> const
>>> /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/functional:2464
>>> #4 (anonymous namespace)::SelectIO(int, bool,
>>> std::function<lldb_private::Error (bool&)> const&,
>>> std::chrono::duration<long, std::ratio<1l, 1000000l> > const&)
>>> tools/lldb/source/Host/posix/PipePosix.cpp:118
>>> #5 lldb_private::PipePosix::Write(void const*, unsigned long,
>>> unsigned long&) tools/lldb/source/Host/posix/PipePosix.cpp:411
>>> #6 IOHandlerProcessSTDIO::Cancel()
>>> tools/lldb/source/Target/Process.cpp:5192
>>> #7
>>> lldb_private::Debugger::PopIOHandler(std::shared_ptr<lldb_private::IOHandler>
>>> const&) tools/lldb/source/Core/Debugger.cpp:1065
>>> #8 lldb_private::Process::PopProcessIOHandler()
>>> tools/lldb/source/Target/Process.cpp:5291
>>> #9
>>> lldb_private::Debugger::HandleProcessEvent(std::shared_ptr<lldb_private::Event>
>>> const&) tools/lldb/source/Core/Debugger.cpp:1544
>>> #10 lldb_private::Debugger::DefaultEventHandler()
>>> tools/lldb/source/Core/Debugger.cpp:1634
>>> #11 lldb_private::Debugger::EventHandlerThread(void*)
>>> tools/lldb/source/Core/Debugger.cpp:1696
>>> #12
>>> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> Previous write of size 8 at 0x7da0000080c0 by main thread:
>>> #0 pipe2 <null>:0
>>> #1 lldb_private::PipePosix::CreateNew(bool)
>>> tools/lldb/source/Host/posix/PipePosix.cpp:168
>>> #2 IOHandlerProcessSTDIO::OpenPipes()
>>> tools/lldb/source/Target/Process.cpp:5078
>>> #3 IOHandlerProcessSTDIO::Run()
>>> tools/lldb/source/Target/Process.cpp:5097
>>> #4 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #5 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #6 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #7 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #8 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Location is file descriptor 12 created by main thread at:
>>> #0 pipe2 <null>:0
>>> #1 lldb_private::PipePosix::CreateNew(bool)
>>> tools/lldb/source/Host/posix/PipePosix.cpp:168
>>> #2 IOHandlerProcessSTDIO::OpenPipes()
>>> tools/lldb/source/Target/Process.cpp:5078
>>> #3 IOHandlerProcessSTDIO::Run()
>>> tools/lldb/source/Target/Process.cpp:5097
>>> #4 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #5 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #6 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #7 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #8 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Read of size 8 at 0x7d080001a5c8 by main thread:
>>> #0 lldb_private::HostNativeThreadBase::GetSystemHandle() const
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:35
>>> #1 lldb_private::HostThread::EqualsThread(unsigned long) const
>>> tools/lldb/source/Host/common/HostThread.cpp:77
>>> #2 lldb_private::Process::GetRunLock()
>>> tools/lldb/source/Target/Process.cpp:6373
>>> #3
>>> lldb_private::ExecutionContextRef::SetTargetPtr(lldb_private::Target*,
>>> bool) tools/lldb/source/Target/ExecutionContext.cpp:723
>>> #4
>>> lldb_private::CommandInterpreter::UpdateExecutionContext(lldb_private::ExecutionContext*)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:2940
>>> #5 lldb_private::CommandInterpreter::HandleCommand(char const*,
>>> lldb_private::LazyBool, lldb_private::CommandReturnObject&,
>>> lldb_private::ExecutionContext*, bool, bool)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:1668
>>> #6
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:2997
>>> #7 non-virtual thunk to
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:3076
>>> #8 lldb_private::IOHandlerEditline::Run()
>>> tools/lldb/source/Core/IOHandler.cpp:729
>>> #9 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #10 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #11 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #12 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #13 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Previous write of size 8 at 0x7d080001a5c8 by thread T6:
>>> #0 memset <null>:0
>>> #1 lldb_private::HostNativeThreadBase::Reset()
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:54
>>> #2 lldb_private::HostThread::Reset()
>>> tools/lldb/source/Host/common/HostThread.cpp:41
>>> #3 lldb_private::Process::RunPrivateStateThread()
>>> tools/lldb/source/Target/Process.cpp:4604
>>> #4 lldb_private::Process::PrivateStateThread(void*)
>>> tools/lldb/source/Target/Process.cpp:4505
>>> #5 lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Write of size 4 at 0x7d680001c8e8 by main thread:
>>> #0 lldb_private::Terminal::SetFileDescriptor(int)
>>> tools/lldb/include/lldb/Host/Terminal.h:46
>>> #1 lldb_private::TerminalState::Save(int, bool)
>>> tools/lldb/source/Host/common/Terminal.cpp:144
>>> #2 lldb_private::Debugger::SaveInputTerminalState()
>>> tools/lldb/source/Core/Debugger.cpp:825
>>> #3 lldb::SBDebugger::SaveInputTerminalState()
>>> tools/lldb/source/API/SBDebugger.cpp:395
>>> #4 sigtstp_handler(int) tools/lldb/tools/driver/Driver.cpp:1203
>>> #5 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool,
>>> int, my_siginfo_t*, void*) tsan_interceptors.o:0
>>> #6 std::string::_Rep::_M_dispose(std::allocator<char> const&)
>>> /build/buildd/gcc-4.8-4.8.2/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.h:538
>>> #7
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:2997
>>> #8 non-virtual thunk to
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:3076
>>> #9 lldb_private::IOHandlerEditline::Run()
>>> tools/lldb/source/Core/IOHandler.cpp:729
>>> #10 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #11 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #12 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #13 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #14 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Previous write of size 4 at 0x7d680001c8e8 by thread T2 (mutexes:
>>> write M159):
>>> #0 lldb_private::Terminal::SetFileDescriptor(int)
>>> tools/lldb/include/lldb/Host/Terminal.h:46
>>> #1 lldb_private::TerminalState::Save(int, bool)
>>> tools/lldb/source/Host/common/Terminal.cpp:144
>>> #2 lldb_private::Debugger::SaveInputTerminalState()
>>> tools/lldb/source/Core/Debugger.cpp:825
>>> #3 lldb::SBDebugger::SaveInputTerminalState()
>>> tools/lldb/source/API/SBDebugger.cpp:395
>>> #4 sigtstp_handler(int) tools/lldb/tools/driver/Driver.cpp:1203
>>> #5 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool,
>>> int, my_siginfo_t*, void*) tsan_interceptors.o:0
>>> #6 lldb_private::Condition::Wait(lldb_private::Mutex&,
>>> lldb_private::TimeValue const*, bool*)
>>> tools/lldb/source/Host/common/Condition.cpp:85
>>> #7 lldb_private::Predicate<bool>::WaitForValueEqualTo(bool,
>>> lldb_private::TimeValue const*, bool*)
>>> tools/lldb/include/lldb/Host/Predicate.h:339
>>> #8
>>> lldb_private::Listener::WaitForEventsInternal(lldb_private::TimeValue
>>> const*, lldb_private::Broadcaster*, lldb_private::ConstString const*,
>>> unsigned int, unsigned int, std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Core/Listener.cpp:442
>>> #9 lldb_private::Listener::WaitForEvent(lldb_private::TimeValue
>>> const*, std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Core/Listener.cpp:492
>>> #10 lldb_private::Debugger::DefaultEventHandler()
>>> tools/lldb/source/Core/Debugger.cpp:1623
>>> #11 lldb_private::Debugger::EventHandlerThread(void*)
>>> tools/lldb/source/Core/Debugger.cpp:1696
>>> #12
>>> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>> ==================
>>> WARNING: ThreadSanitizer: data race (pid=64299)
>>> Write of size 4 at 0x7d680001c8ec by main thread:
>>> #0 lldb_private::TerminalState::Save(int, bool)
>>> tools/lldb/source/Host/common/Terminal.cpp:148
>>> #1 lldb_private::Debugger::SaveInputTerminalState()
>>> tools/lldb/source/Core/Debugger.cpp:825
>>> #2 lldb::SBDebugger::SaveInputTerminalState()
>>> tools/lldb/source/API/SBDebugger.cpp:395
>>> #3 sigtstp_handler(int) tools/lldb/tools/driver/Driver.cpp:1203
>>> #4 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool,
>>> int, my_siginfo_t*, void*) tsan_interceptors.o:0
>>> #5 std::string::_Rep::_M_dispose(std::allocator<char> const&)
>>> /build/buildd/gcc-4.8-4.8.2/build/x86_64-linux-gnu/libstdc++-v3/include/bits/basic_string.h:538
>>> #6
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:2997
>>> #7 non-virtual thunk to
>>> lldb_private::CommandInterpreter::IOHandlerInputComplete(lldb_private::IOHandler&,
>>> std::string&) tools/lldb/source/Interpreter/CommandInterpreter.cpp:3076
>>> #8 lldb_private::IOHandlerEditline::Run()
>>> tools/lldb/source/Core/IOHandler.cpp:729
>>> #9 lldb_private::Debugger::ExecuteIOHandlers()
>>> tools/lldb/source/Core/Debugger.cpp:907
>>> #10 lldb_private::CommandInterpreter::RunCommandInterpreter(bool,
>>> bool, lldb_private::CommandInterpreterRunOptions&)
>>> tools/lldb/source/Interpreter/CommandInterpreter.cpp:3234
>>> #11 lldb::SBDebugger::RunCommandInterpreter(bool, bool)
>>> tools/lldb/source/API/SBDebugger.cpp:980
>>> #12 Driver::MainLoop() tools/lldb/tools/driver/Driver.cpp:1152
>>> #13 main tools/lldb/tools/driver/Driver.cpp:1252
>>>
>>> Previous write of size 4 at 0x7d680001c8ec by thread T2 (mutexes:
>>> write M159):
>>> #0 lldb_private::TerminalState::Save(int, bool)
>>> tools/lldb/source/Host/common/Terminal.cpp:148
>>> #1 lldb_private::Debugger::SaveInputTerminalState()
>>> tools/lldb/source/Core/Debugger.cpp:825
>>> #2 lldb::SBDebugger::SaveInputTerminalState()
>>> tools/lldb/source/API/SBDebugger.cpp:395
>>> #3 sigtstp_handler(int) tools/lldb/tools/driver/Driver.cpp:1203
>>> #4 __tsan::CallUserSignalHandler(__tsan::ThreadState*, bool, bool,
>>> int, my_siginfo_t*, void*) tsan_interceptors.o:0
>>> #5 lldb_private::Condition::Wait(lldb_private::Mutex&,
>>> lldb_private::TimeValue const*, bool*)
>>> tools/lldb/source/Host/common/Condition.cpp:85
>>> #6 lldb_private::Predicate<bool>::WaitForValueEqualTo(bool,
>>> lldb_private::TimeValue const*, bool*)
>>> tools/lldb/include/lldb/Host/Predicate.h:339
>>> #7
>>> lldb_private::Listener::WaitForEventsInternal(lldb_private::TimeValue
>>> const*, lldb_private::Broadcaster*, lldb_private::ConstString const*,
>>> unsigned int, unsigned int, std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Core/Listener.cpp:442
>>> #8 lldb_private::Listener::WaitForEvent(lldb_private::TimeValue
>>> const*, std::shared_ptr<lldb_private::Event>&)
>>> tools/lldb/source/Core/Listener.cpp:492
>>> #9 lldb_private::Debugger::DefaultEventHandler()
>>> tools/lldb/source/Core/Debugger.cpp:1623
>>> #10 lldb_private::Debugger::EventHandlerThread(void*)
>>> tools/lldb/source/Core/Debugger.cpp:1696
>>> #11
>>> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*)
>>> tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81
>>>
>>>
>>> -- Ryan Brown
>>>
>>> On Mon, May 11, 2015 at 8:20 AM, Ed Maste <emaste at freebsd.org> wrote:
>>>
>>>> On 11 May 2015 at 10:21, Pavel Labath <labath at google.com> wrote:
>>>> >
>>>> > BTW, I've noticed that PushIOHandler does not lock
>>>> > m_input_reader_stack.GetMutex(), unlike PopIOHandler, and all other
>>>> > functions which deal with handlers. Is that intentional? I think it
>>>> > should lock the mutex as well.
>>>>
>>>> A slight tangent here, but there's a lot of dubious thread behaviour
>>>> like this. One example I've run into is PR22611 - I see that if we set
>>>> a prompt that fits in libc++'s short string optimization (that is, no
>>>> more than 22 characters) it works fine, but as soon as the prompt is
>>>> 23 characters long we end up pointing at uninitialized memory;
>>>> presumably the race window is much larger in that case.
>>>>
>>>> Unfortunately TSan isn't fully functional on FreeBSD at the moment, so
>>>> it's not that easy for me to find other cases like this with a
>>>> systematic approach. I recall there was an effort to run LLDB under
>>>> TSan on Linux some time ago, and that found a number of issues. Is
>>>> anyone on the Linux side interested in picking that up again?
>>>> _______________________________________________
>>>> lldb-dev mailing list
>>>> lldb-dev at cs.uiuc.edu
>>>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>>>
>>>
>>> _______________________________________________
>>> lldb-dev mailing list
>>> lldb-dev at cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>>
>>
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