https://bugs.kde.org/show_bug.cgi?id=489146
Bug ID: 489146
Summary: Krita hangs while playing an animation with audio and
scrubbing at the same time
Classification: Applications
Product: krita
Version: git master (please specify the git hash!)
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Animation
Assignee: krita-bugs-n...@kde.org
Reporter: yavn.w...@gmail.com
Target Milestone: ---
Created attachment 170934
--> https://bugs.kde.org/attachment.cgi?id=170934&action=edit
call stack at the time of the freeze
This affects master, 5.2.3, and 5.2.2. Tested in master with commit hash
706cb7d60a66c161028c2f811ac6994016b2a83f.
SUMMARY
If an animation with audio (i.e. using MLT backend) is playing, sometimes
scrubbing in the timeline will cause a thread deadlock, which leads to the app
being unresponsive (freezing), then crashing (killed by the OS).
Stopping in the debugger at the time of the freeze, I saw this call stack (also
attached):
1 NtWaitForMultipleObjects
(x86_64) C:\Windows\System32\ntdll.dll
0x7ff90fa70af4
2 WaitForMultipleObjectsEx
(x86_64) C:\Windows\System32\KernelBase.dll
0x7ff90ce76089
3 WaitForMultipleObjects
(x86_64) C:\Windows\System32\KernelBase.dll
0x7ff90ce75f8e
4 _pthread_wait_for_multiple_objects
misc.c 146
0x7ff8ef032e18
5 do_sema_b_wait_intern
cond.c 647
0x7ff8ef032a80
6 do_sema_b_wait
cond.c 606
0x7ff8ef031ecf
7 pthread_cond_timedwait_impl
cond.c 526
0x7ff8ef032987
8 mlt_consumer_put_frame
(x86_64) C:\Users\Maciek\krita-dev\_install\bin\libmlt-7.dll
0x7ff86697bfeb
9 Mlt::PushConsumer::push(Mlt::Frame *)
(x86_64) C:\Users\Maciek\krita-dev\_install\bin\libmlt++-7.dll
0x7ff8f70cc4e4
10 Mlt::PushConsumer::push(Mlt::Frame&)
(x86_64) C:\Users\Maciek\krita-dev\_install\bin\libmlt++-7.dll
0x7ff8f70cc50d
11 KisPlaybackEngineMLT::Private::pushAudio(int)
KisPlaybackEngineMLT.cpp 160
0x7ff85557acf5
12 std::__function::__value_func<void (int)>::operator()[abi:v15000](int&&)
const function.h 512
0x7ff8554f3505
13 std::function<void (int)>::operator()(int) const
function.h 1187
0x7ff8554f34ee
14 KisSignalCompressorWithParam<int>::fakeSlotTimeout()
kis_signal_compressor_with_param.h 151
0x7ff8554f34ee
15 void doActivate<false>(QObject *, int, void * *)
qobject.cpp 3931
0x7ff846760cbb
16 KisSignalCompressor::tryEmitSignalSafely()
kis_signal_compressor.cpp 199
0x7ff867a43d3e
17 KisSignalCompressor::start()
kis_signal_compressor.cpp 117
0x7ff867a43d36
18 KisSignalCompressorWithParam<int>::start(int)
kis_signal_compressor_with_param.h 134
0x7ff855578335
19 KisPlaybackEngineMLT::seek(int, QFlags<SeekOption>)
KisPlaybackEngineMLT.cpp 344
0x7ff855578328
20 KisTimeBasedItemModel::setHeaderData(int, Qt::Orientation, QVariant const&,
int) KisTimeBasedItemModel.cpp 332
0x7ff8046ece16
... <More>
KA post:
https://krita-artists.org/t/testers-wanted-5-2-3-beta1-issues-and-feedback-thread/93122/64?u=yrh
STEPS TO REPRODUCE
Video: https://youtu.be/1157fjYRlYI
1. Open a new document with an animation timeline.
2. Add any audio track (to switch to the MLT engine; the length of the audio
shouldn’t matter)
3. Change playback settings to
start frame 0
end frame 5000
FPS 100
4. Hit play
5. As the playback goes on, keep clicking and slightly dragging on the frame
numbers to rewind the playback to the clicked frames. Eventually it will freeze
due to a deadlock.
OBSERVED RESULT
The UI becomes unresponsive. Threads deadlocking with the call stack pointing
to KisPlaybackEngineMLT::Private::pushAudio(int).
EXPECTED RESULT
Scrubbing works normally and cannot cause a hang/crash.
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