https://bugs.kde.org/show_bug.cgi?id=484042
Bug ID: 484042
Summary: kwin_wayland crash while display is in standby
Classification: Plasma
Product: kwin
Version: 6.0.2
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: yam...@yamagi.org
Target Milestone: ---
Created attachment 167495
--> https://bugs.kde.org/attachment.cgi?id=167495&action=edit
Full backtrace of the crash
I don't really have a repoducer for this. I think I have seen this one twice on
two different system, both with kwin_wayland 6.0.2. I haven't seen it with
6.0.1, however that may have been luck. In both cases the session was idle and
the displays in standby.
* At the first crash the session was idle for several hours.
* At the second crash for several minutes.
Several programs were running in the background:
* Plasma itself.
* Firefox
* Thunderbird
* Alacritty
* rdesktop (only at the first crash)
This backtrace is from the second crash. Thread 1 is given here, the full
backtrace attached as a file. It's too long to paste it inline:
```
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0
--xwayland-fd 8 --xwayl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007399d39396bb in std::__atomic_base<QThreadData*>::load
(__m=std::memory_order_acquire, this=0x5c)
at /usr/include/c++/13.2.1/atomic:576
576 load(memory_order __m = memory_order_seq_cst) const noexcept
[Current thread is 1 (Thread 0x7399ce4b5a00 (LWP 1168))]
Thread 1 (Thread 0x7399ce4b5a00 (LWP 1168)):
#0 0x00007399d39396bb in std::__atomic_base<QThreadData*>::load
(__m=std::memory_order_acquire, this=0x5c) at
/usr/include/c++/13.2.1/atomic:576
#1 std::atomic<QThreadData*>::load (__m=std::memory_order_acquire, this=0x5c)
at /usr/include/c++/13.2.1/atomic:577
#2 QAtomicOps<QThreadData*>::loadAcquire<QThreadData*> (_q_value=<error
reading variable: Cannot access memory at address 0x5c>, _q_value=<optimized
out>) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qatomic_cxx11.h:213
#3 QBasicAtomicPointer<QThreadData>::loadAcquire (this=0x5c, this=<optimized
out>) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qbasicatomic.h:179
#4 QCoreApplication::notifyInternal2 (receiver=0x602220606c10,
event=0x7ffefe7c9680) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1117
#5 0x00007399d3a9efa6 in QCoreApplication::sendEvent (event=0x7ffefe7c9680,
receiver=<optimized out>) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1539
#6 QTimerInfoList::activateTimers (this=this@entry=0x60221e166868) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qtimerinfo_unix.cpp:507
#7 0x00007399d3a9f9d1 in QEventDispatcherUNIXPrivate::activateTimers
(this=0x60221e166790) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_unix.cpp:212
#8 QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=...,
flags@entry=...) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_unix.cpp:481
#9 0x00007399d43b26e2 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#10 0x00007399d3943d6e in QEventLoop::processEvents (flags=...,
this=0x7ffefe7c9870) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:100
#11 QEventLoop::exec (this=0x7ffefe7c9870, flags=...) at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:182
#12 0x00007399d393c2b8 in QCoreApplication::exec () at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/global/qflags.h:74
#13 0x00007399d48f0f0a in QApplication::exec () at
/usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/kernel/qapplication.cpp:2574
#14 0x000060221df6edee in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/kwin/kwin-6.0.2/src/main_wayland.cpp:609
```
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux with 6.0.2
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
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