https://bugs.kde.org/show_bug.cgi?id=478496
Bug ID: 478496
Summary: kwin_wayland crashes upon start when KSCreen
`XwaylandClientsScale=false` in kdeglobals
Classification: Frameworks and Libraries
Product: frameworks-kwindowsystem
Version: 5.27.0
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: i...@xuzhao.net
Target Milestone: ---
SUMMARY
Upon system start, kwin_wayland crashes with the following stacktrace:
```
Nov 27 22:33:54 arch-desktop systemd-coredump[1460]: [?] Process 1202
(kwin_wayland) of user 1000 dumped core.
Stack trace of thread
1202:
#0 0x00007ffb2e4ac83c n/a
(libc.so.6 + 0x8e83c)
#1 0x00007ffb2e45c668
raise (libc.so.6 + 0x3e668)
#2 0x00007ffb2e4444b8
abort (libc.so.6 + 0x264b8)
#3 0x00007ffb3058afee n/a
(libepoxy.so.0 + 0xbbfee)
#4 0x00007ffb3058e9d2 n/a
(libepoxy.so.0 + 0xbf9d2)
#5 0x00007ffb31030d97 n/a
(libkwin.so.5 + 0x430d97)
#6 0x00007ffb31032bc9
_ZN4KWin9EglDmabufD1Ev (libkwin.so.5 +>
#7 0x00007ffb31034121
_ZN4KWin18AbstractEglBackendD2Ev (libk>
#8 0x00007ffb30f75f7d n/a
(libkwin.so.5 + 0x375f7d)
#9 0x00007ffb30dc058b
_ZN4KWin10Compositor4stopEv (libkwin.s>
#10 0x00007ffb30db9108
_ZN4KWin10Compositor12reinitializeEv (>
#11 0x00007ffb2f4d1097 n/a
(libQt5Core.so.5 + 0x2d1097)
#12 0x00007ffb30f11dba
_ZN4KWin9Workspace15slotReconfigureEv >
#13 0x00007ffb2f4d1097 n/a
(libQt5Core.so.5 + 0x2d1097)
#14 0x00007ffb2f4d2bcf
_ZN6QTimer7timeoutENS_14QPrivateSignal>
#15 0x00007ffb2f4c3b4e
_ZN7QObject5eventEP6QEvent (libQt5Core>
#16 0x00007ffb2eb788ff
_ZN19QApplicationPrivate13notify_helpe>
#17 0x00007ffb2f49c168
_ZN16QCoreApplication15notifyInternal2>
#18 0x00007ffb2f4ea7cb
_ZN14QTimerInfoList14activateTimersEv >
#19 0x00007ffb2f4eacb1
_ZN20QEventDispatcherUNIX13processEven>
#20 0x00005557facd7ce2 n/a
(kwin_wayland + 0x137ce2)
#21 0x00007ffb2f49ae74
_ZN10QEventLoop4execE6QFlagsINS_17Proc>
#22 0x00007ffb2f49c313
_ZN16QCoreApplication4execEv (libQt5Co>
#23 0x00005557fabf340b n/a
(kwin_wayland + 0x5340b)
#24 0x00007ffb2e445cd0 n/a
(libc.so.6 + 0x27cd0)
#25 0x00007ffb2e445d8a
__libc_start_main (libc.so.6 + 0x27d8a)
#26 0x00005557fabf5015 n/a
(kwin_wayland + 0x55015)
Stack trace of thread
1215:
#0 0x00007ffb2e520f6f
__poll (libc.so.6 + 0x102f6f)
#1 0x00007ffb2d16c276 n/a
(libglib-2.0.so.0 + 0xb8276)
#2 0x00007ffb2d10c162
g_main_context_iteration (libglib-2.0.>
#3 0x00007ffb2f4eaf7c
_ZN20QEventDispatcherGlib13processEven>
#4 0x00007ffb2f49ae74
_ZN10QEventLoop4execE6QFlagsINS_17Proc>
#5 0x00007ffb2f2f74f6
_ZN7QThread4execEv (libQt5Core.so.5 + >
#6 0x00007ffb31354a9a n/a
(libQt5DBus.so.5 + 0x18a9a)
#7 0x00007ffb2f2f371a n/a
(libQt5Core.so.5 + 0xf371a)
#8 0x00007ffb2e4aa9eb n/a
(libc.so.6 + 0x8c9eb)
#9 0x00007ffb2e52e7cc n/a
(libc.so.6 + 0x1107cc)
Stack trace of thread
1217:
#0 0x00007ffb2e520f6f
__poll (libc.so.6 + 0x102f6f)
#1 0x00007ffb2d16c276 n/a
(libglib-2.0.so.0 + 0xb8276)
#2 0x00007ffb2d10c162
g_main_context_iteration (libglib-2.0.>
#3 0x00007ffb2f4eaf7c
_ZN20QEventDispatcherGlib13processEven>
#4 0x00007ffb2f49ae74
_ZN10QEventLoop4execE6QFlagsINS_17Proc>
#5 0x00007ffb2f2f74f6
_ZN7QThread4execEv (libQt5Core.so.5 + >
#6 0x00007ffb2f2f371a n/a
(libQt5Core.so.5 + 0xf371a)
#7 0x00007ffb2e4aa9eb n/a
(libc.so.6 + 0x8c9eb)
#8 0x00007ffb2e52e7cc n/a
(libc.so.6 + 0x1107cc)
Stack trace of thread 1231:
#0 0x00007ffb2e4a74ae n/a
(libc.so.6 + 0x894ae)
#1 0x00007ffb2e4aa055
pthread_cond_timedwait (libc.so.6 + 0x>
#2 0x00007ffb2f2fb434
_ZN14QWaitCondition4waitEP6QMutex14QDe>
#3 0x00007ffb2f2f856a n/a
(libQt5Core.so.5 + 0xf856a)
#4 0x00007ffb2f2f371a n/a
(libQt5Core.so.5 + 0xf371a)
#5 0x00007ffb2e4aa9eb n/a
(libc.so.6 + 0x8c9eb)
#6 0x00007ffb2e52e7cc n/a
(libc.so.6 + 0x1107cc)
Stack trace of thread
1232:
#0 0x00007ffb2e520f6f
__poll (libc.so.6 + 0x102f6f)
#1 0x00007ffb2d16c276 n/a
(libglib-2.0.so.0 + 0xb8276)
#2 0x00007ffb2d10c162
g_main_context_iteration (libglib-2.0.>
#3 0x00007ffb2f4eaf7c
_ZN20QEventDispatcherGlib13processEven>
#4 0x00007ffb2f49ae74
_ZN10QEventLoop4execE6QFlagsINS_17Proc>
#5 0x00007ffb2f2f74f6
_ZN7QThread4execEv (libQt5Core.so.5 + >
#6 0x00007ffb302c5880 n/a
(libQt5Qml.so.5 + 0x2c5880)
#7 0x00007ffb2f2f371a n/a
(libQt5Core.so.5 + 0xf371a)
#8 0x00007ffb2e4aa9eb n/a
(libc.so.6 + 0x8c9eb)
#9 0x00007ffb2e52e7cc n/a
(libc.so.6 + 0x1107cc)
ELF object binary
architecture: AMD x86-64
Nov 27 22:33:54 arch-desktop systemd[1]: systemd-coredump@2-1459-0.service:
Deactivated successfully.
Nov 27 22:33:54 arch-desktop org_kde_powerdevil[1331]: The Wayland connection
broke. Did the Wayland compositor di>
Nov 27 22:33:54 arch-desktop polkitd[531]: Unregistered Authentication Agent
for unix-session:2 (system bus name :>
Nov 27 22:33:54 arch-desktop kwin_wayland_wrapper[1235]: (EE) failed to read
Wayland events: Broken pipe
Nov 27 22:33:54 arch-desktop polkit-kde-authentication-agent-1[1330]: The
Wayland connection broke. Did the Waylan>
Nov 27 22:33:54 arch-desktop kactivitymanagerd[1323]: The Wayland connection
broke. Did the Wayland compositor die?
Nov 27 22:33:54 arch-desktop kded5[1266]: The Wayland connection broke. Did the
Wayland compositor die?
Nov 27 22:33:54 arch-desktop kwalletd5[794]: The Wayland connection broke. Did
the Wayland compositor die?
```
Removing the following section from ~/.config/kdeglobals, the issue is gone:
```
[KScreen]
ScaleFactor=1.25
ScreenScaleFactors=DP-2=1.25;HDMI-A-1=1.25;Unknown-1=1.25;
XwaylandClientsScale=false
```
STEPS TO REPRODUCE
1. In System Settings/Display and Monitor/Display Configuration - Legacy
Applications (X11), select "Scaled by the system", and use Scale factor 200%
2. Restart the machine. (May need to restart several times to reproduce)
OBSERVED RESULT
kwin_wayland will crash with the above stacktrace.
EXPECTED RESULT
kwin_wayland does not crash.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux 6.6.1
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
openSUSE Tumbleweed 20231117
ADDITIONAL INFORMATION
The same issue is also reproduced on ArchLinux:
https://bbs.archlinux.org/viewtopic.php?id=290684
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