[lldb-dev] lldb::SBDebugger::Terminate() hangs in deadlock

[Stefan Kratochwil via lldb-dev]

Hi Pavel,

thanks for your quick reply.

I filed a bug at https://llvm.org/bugs/show_bug.cgi?id=24958.

I'll try to determine a more precise revision range for that issue. I am 
currently using svn (checking out lldb manually into llvm/tools).
Do you have a recommended workflow for git in such a situation? git 
bisect with subtree / submodule?

Cheers,
Stefan


On 09/28/2015 10:24 AM, Pavel Labath wrote:
> Hi,
>
> Thanks for the report. Since you are suspecting a deadlock, could you
> post a backtrace of all the threads (thread apply all backtrace). It
> would be best to move this discussion to a bug in llvm.org/bugs.
>
>> I am currently using svn revision 247535 of llvm and lldb, and I know that my code was working with svn revision 229496
> This sounds like a pretty big revision range. It would help if you
> could narrow it down a bit.
>
> pl
>
>
> On 28 September 2015 at 09:12, Stefan Kratochwil via lldb-dev
> <lldb-dev at lists.llvm.org> wrote:
>> Hi,
>>
>> I've got a problem with lldb deadlocking upon a call to
>> lldb::SBDebugger::Terminate().
>>
>> I am currently using svn revision 247535 of llvm and lldb, and I know that
>> my code was working with svn revision 229496.
>>
>> In short, I am doing the following steps:
>>
>>    lldb_debugger = lldb::SBDebugger::Create()
>>    lldb_debugger.SetAsync(true)
>>    lldb_target = lldb_debugger.CreateTarget()
>>    lldb_process = lldb_target.AttachToProcessWithID()
>>    ... (doing stuff with modules)
>>    lldb::SBDebugger::Terminate()
>>
>> The last call results in a deadlock.
>>
>> I enabled the DEBUG_LOG and ENABLE_MUTEX_ERROR_CHECKING macros within
>> Mutex.cpp and found out that a mutex is getting locked whose ID never came
>> up in the log before. This mutex has no owner, so it should be lockable -
>> but it isn't...
>>
>> A gdb backtrace with the last few debug messages can be found here:
>> http://pastebin.com/Kv4EidHx
>>
>>
>> Does anyone have an idea what is going on here? Am I missing something?
>>
>> Thanks in advance!
>>
>>
>> Cheers,
>> Stefan Kratochwil
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