https://bugs.kde.org/show_bug.cgi?id=467298
Bug ID: 467298
Summary: kwin_wayland segfaults in
KWaylandServer::OutputInterface::handle() on screen
off when system is locked
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: wolfendea...@gmail.com
Target Milestone: ---
Created attachment 157244
--> https://bugs.kde.org/attachment.cgi?id=157244&action=edit
kwin_wayland lockscreen crash stacktrace
SUMMARY
`kwin_wayland` segfaults in `KWaylandServer::OutputInterface::handle()` if
computer sits on the lock screen for the amount of time set in `System Settings
> Power Management > Energy Saving > On AC Power > Screen Energy Saving`. This
happens sometimes on closing and opening the lid of the laptop as well, but
it's less frequent whereas the steps described below reproduce the problem 100%
of the time for me.
Stack trace of dumped core is in attached file
`kwin_wayland-lockscreen-crash-stacktrace.txt`.
Backtrace from `debuginfod` and `gdb`:
```
#0 0x00007f65999d2f14 in KWaylandServer::OutputInterface::handle() const () at
/usr/lib/libkwin.so.5
#1 0x00007f65999c59c0 in () at /usr/lib/libkwin.so.5
#2 0x00007f65999c5d5a in () at /usr/lib/libkwin.so.5
#3 0x00007f6597ebea71 in () at /usr/lib/libQt5Core.so.5
#4 0x00007f65997c495e in KWin::Output::setState(KWin::Output::State const&) ()
at /usr/lib/libkwin.so.5
#5 0x00007f659997ccba in
KWin::DrmOutput::updateDpmsMode(KWin::Output::DpmsMode) () at
/usr/lib/libkwin.so.5
#6 0x00007f659997dd64 in
KWin::DrmOutput::setDrmDpmsMode(KWin::Output::DpmsMode) () at
/usr/lib/libkwin.so.5
#7 0x00007f6597ebea71 in () at /usr/lib/libQt5Core.so.5
#8 0x00007f6597ec0fcf in QTimer::timeout(QTimer::QPrivateSignal) () at
/usr/lib/libQt5Core.so.5
#9 0x00007f6597eb1b56 in QObject::event(QEvent*) () at
/usr/lib/libQt5Core.so.5
#10 0x00007f6597578b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /usr/lib/libQt5Widgets.so.5
#11 0x00007f6597e8df48 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /usr/lib/libQt5Core.so.5
#12 0x00007f6597ed84b3 in QTimerInfoList::activateTimers() () at
/usr/lib/libQt5Core.so.5
#13 0x00007f6597ed8962 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt5Core.so.5
#14 0x000055c6dfaf95f2 in ()
#15 0x00007f6597e866ec in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#16 0x00007f6597e91219 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#17 0x000055c6dfa16242 in ()
#18 0x00007f6596e3c790 in () at /usr/lib/libc.so.6
#19 0x00007f6596e3c84a in __libc_start_main () at /usr/lib/libc.so.6
#20 0x000055c6dfa17e95 in ()
```
STEPS TO REPRODUCE
1. In `System Settings > Power Management > Energy Saving > On AC Power` set a
time for `Screen Energy Saving` (mine was set for 30 minutes)
2. (_likely_ optional) On the same page, uncheck `Suspend Session`
3. Lock the machine and let it sit for the time set in step 1
OBSERVED RESULT
One of two things happens:
1. Upon entering the correct password on the lock screen, the login prompt it
replaced with a button that says "Unlock" that doesn't do anything.
2. Upon waking up the machine the 'The screen locker is broken and unlocking is
not possible anymore.` screen is present.
For both outcomes, only `sudo loginctl unlock-sessions` in a separate tty is
able to restore the session. Once the session is unlocked, all applications
have closed (in `journalctl` after the segfault, all services report
`kactivitymanagerd[1213]: The Wayland connection broke. Did the Wayland
compositor die?` but with the appropriate service name/number).
EXPECTED RESULT
Able to log back in as normal.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.2.2-arch1-g14-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 6900HS with Radeon Graphics
Memory: 38.4 GiB of RAM
Graphics Processor: AMD Radeon RX 6700S
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: ROG Zephyrus G14 GA402RJ_GA402RJ
System Version: 1.0
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