https://bugs.kde.org/show_bug.cgi?id=521812
Bug ID: 521812
Summary: Crash (SIGSEGV) in background worker thread during
audio waveform generation with QML binding loop
warning
Classification: Applications
Product: kdenlive
Version First 26.04.2
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: Timeline & Editing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
### Environment Information:
• OS: Arch Linux (rolling release)
• Window Manager: Hyprland (Wayland)
• Kdenlive Version: 26.04.2-1
• Qt Version: 6.11.1-1 (qt6-base)
• Graphics Integration: Wayland-EGL / QtWaylandClient
──────
### Observed Behavior:
Kdenlive suddenly crashed with a Segmentation Fault (SIGSEGV, Signal 11)
while loading a project and processing audio thumbnails.
Before the crash, system logs ( journalctl ) recorded massive spam of QML
binding loop warnings from ClipAudioThumbs.qml :
qrc:/qt/qml/org/kde/kdenlive/ClipAudioThumbs.qml:84:9: QML
TimelineWaveform: Binding loop detected for property "waveOutPoint":
qrc:/qt/qml/org/kde/kdenlive/ClipAudioThumbs.qml:97:13 The crash itself
occurs in a background worker thread ( LWP 15551 ) managed by QThread right
after checking packages/handling timeline clips:
// RAN CONCURRENT SCRIPT: true , SCRIPT: "checkpackages.py" ,
firstARG: "--install"
──────
### Coredump Stack Trace (GDB output):
Signal: 11 (SEGV)
Executable: /usr/bin/kdenlive
Thread 1 (Thread 0x7f2c2bf966c0 (LWP 15551) - Crashing Thread):
#0 0x00007f2d02bf0277 in ?? () from /usr/lib/libQt6Core.so.6
#1 0x000055bf5dc9d418 in ?? ()
#2 0x000055bf5dc97a90 in ?? ()
#3 0x000055bf5dc9792b in ?? ()
#4 0x00007f2d02cb6f45 in ?? () from /usr/lib/libQt6Core.so.6
#5 0x00007f2d02d784fb in ?? () from /usr/lib/libQt6Core.so.6
#6 0x00007f2d022981b9 in ?? () from /usr/lib/libc.so.6
#7 0x00007f2d0231d21c in ?? () from /usr/lib/libc.so.6
Thread 2 (Thread 0x7f2ceea06600 (LWP 15320) - Main Thread):
#0 0x00007f2d022a0a52 in ?? () from /usr/lib/libc.so.6
#1 0x00007f2d02294abc in ?? () from /usr/lib/libc.so.6
#2 0x00007f2d02294e07 in ?? () from /usr/lib/libc.so.6
#3 0x00007f2d02297882 in pthread_cond_timedwait () from
/usr/lib/libc.so.6
#4 0x00007f2d02d713a9 in QWaitCondition::wait(QMutex*,
QDeadlineTimer) () from /usr/lib/libQt6Core.so.6
#5 0x00007f2d021901fe in
QtWaylandClient::QWaylandWindow::waitForFrameSync(int) () from
/usr/lib/libQt6WaylandClient.so.6
#6 0x00007f2cec018ed5 in
QtWaylandClient::QWaylandGLContext::swapBuffers(QPlatformSurface*)
() from /usr/lib/qt6/plugins/wayland-graphics-integration-
client/libqt-plugin-wayland-egl.so
#7 0x00007f2d063e240d in ?? () from /usr/lib/libQt6Gui.so.6
#8 0x00007f2d062316e7 in QRhi::endFrame(QRhiSwapChain*,
QFlags<QRhi::EndFrameFlag>) () from /usr/lib/libQt6Gui.so.6
#9 0x00007f2d06051e45 in ?? () from /usr/lib/libQt6Gui.so.6
#10 0x00007f2d061ddb41 in
QPlatformBackingStore::rhiFlush(QWindow*, double, QRegion const&,
QPoint const&, QPlatformTextureList*, bool, double) () from
/usr/lib/libQt6Gui.so.6
#11 0x00007f2d0697c29f in QWidgetRepaintManager::flush(QWidget*,
QRegion const&, QPlatformTextureList*) () from
/usr/lib/libQt6Widgets.so.6
...
──────
### Temporary Workaround:
The crash stops happening if Concurrent threads under Settings >
Configure Kdenlive > Environment > Proxy and Transcode Jobs is limited to 1
. This points to a potential race
condition/threading issue inside MLT/FFmpeg audio decoding when
invoked via concurrent Qt6 background threads on this system
package.
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