LLDB, connected to a stub I'm building, is trying to produce a stack trace of
my stopped program but deadlocks instead:
#0 __psynch_mutexwait ()
#1 pthread_mutex_lock ()
#2 lldb_private::Mutex::Lock() at lldb/source/Host/common/Mutex.cpp:281
#3 lldb_private::Mutex::Locker::Lock(lldb_private::Mutex&) at
lldb/source/Host/common/Mutex.cpp:152
#4 lldb_private::Mutex::Locker::Locker(lldb_private::Mutex&) at
lldb/source/Host/common/Mutex.cpp:112
#5 lldb_private::Mutex::Locker::Locker(lldb_private::Mutex&) at
lldb/source/Host/common/Mutex.cpp:113
#6 lldb_private::Unwind::GetFrameCount() at
lldb/include/lldb/Target/Unwind.h:51
#7 UnwindMacOSXFrameBackchain::DoGetFrameInfoAtIndex(unsigned int,
unsigned long long&, unsigned long long&) at
lldb/source/Plugins/Process/Utility/UnwindMacOSXFrameBackchain.cpp:59
#8 lldb_private::Unwind::GetFrameInfoAtIndex(unsigned int, unsigned long
long&, unsigned long long&) at lldb/include/lldb/Target/Unwind.h:78
#9 lldb_private::StackFrameList::GetFramesUpTo(unsigned int) at
lldb/source/Target/StackFrameList.cpp:304
#10 lldb_private::StackFrameList::ResetCurrentInlinedDepth() at
lldb/source/Target/StackFrameList.cpp:110
#11 lldb_private::StackFrameList::CalculateCurrentInlinedDepth() at
lldb/source/Target/StackFrameList.cpp:79
#12 lldb_private::Thread::ShouldStop(lldb_private::Event*) at
lldb/source/Target/Thread.cpp:752
#13 lldb_private::ThreadList::ShouldStop(lldb_private::Event*) at
lldb/source/Target/ThreadList.cpp:298
#14 lldb_private::Process::ShouldBroadcastEvent(lldb_private::Event*) at
lldb/source/Target/Process.cpp:3707
#15
lldb_private::Process::HandlePrivateEvent(std::__1::shared_ptr<lldb_private::Event>&)
at lldb/source/Target/Process.cpp:3936
#16 lldb_private::Process::ConnectRemote(lldb_private::Stream*, char
const*) at lldb/source/Target/Process.cpp:3257
#17 CommandObjectProcessConnect::DoExecute(lldb_private::Args&,
lldb_private::CommandReturnObject&) at
lldb/source/Commands/CommandObjectProcess.cpp:1173
#18 lldb_private::CommandObjectParsed::Execute(char const*,
lldb_private::CommandReturnObject&) at
lldb/source/Interpreter/CommandObject.cpp:1038
#19 lldb_private::CommandInterpreter::HandleCommand(char const*,
lldb_private::LazyBool, lldb_private::CommandReturnObject&,
lldb_private::ExecutionContext*, bool, bool) at
lldb/source/Interpreter/CommandInterpreter.cpp:1825
#20 lldb_private::CommandObjectRegexCommand::DoExecute(char const*,
lldb_private::CommandReturnObject&) at
lldb/source/Interpreter/CommandObjectRegexCommand.cpp:89
#21 lldb_private::CommandObjectRaw::Execute(char const*,
lldb_private::CommandReturnObject&) at
lldb/source/Interpreter/CommandObject.cpp:1064
#22 lldb_private::CommandInterpreter::HandleCommand(char const*,
lldb_private::LazyBool, lldb_private::CommandReturnObject&,
lldb_private::ExecutionContext*, bool, bool) at
lldb/source/Interpreter/CommandInterpreter.cpp:1825
#23 lldb::SBCommandInterpreter::HandleCommand(char const*,
lldb::SBCommandReturnObject&, bool) at
lldb/source/API/SBCommandInterpreter.cpp:122
#24 Driver::HandleIOEvent(lldb::SBEvent const&) at
lldb/tools/driver/Driver.cpp:1083
#25 Driver::MainLoop() at lldb/tools/driver/Driver.cpp:1556
#26 main at lldb/tools/driver/Driver.cpp:1727
#27 start ()
#8 locks m_unwind_mutex and #6 tries to do the same thing.
The code path is unconditional (calling GetFrameInfoAtIndex with a
UnwindMacOSXFrameBackchain can only end in a deadlock, from what I can see), so
I'm not sure how I can prevent this from happening.
Félix
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