https://bugs.kde.org/show_bug.cgi?id=520145
Bug ID: 520145
Summary: kwin_wayland crashes in
KWin::LibInput::Connection::applyScreenToDevice when
toggling monitor power or VRR via OSD
Classification: Plasma
Product: kwin
Version First 6.6.5
Reported In:
Platform: CachyOS
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: libinput
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
kwin_wayland crashes (SIGSEGV) whenever the monitor's connection state or
configuration changes rapidly (e.g., toggling VRR via monitor OSD or
power-cycling the display).
STEPS TO REPRODUCE
1. Log into a Plasma Wayland session.
2. Open several applications.
3. Perform a hardware-level display change:
Either toggle the VRR (Adaptive Sync) setting in the monitor's OSD menu.
Or turn the monitor power OFF and then ON again.
4. The entire session crashes, all applications are closed
OBSERVED RESULT
KWin crashes with signal SIGSEGV, Segmentation fault and restarted. All the
apps attached to this session is lost.
EXPECTED RESULT
KWin shouldn't crash. User apps should leave unchanged after toggling the
monitor/IO devices
SOFTWARE/OS VERSIONS
Operating System : CachyOS Linux
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Qt Version: 6.11.0
Kernel Version: 7.0.5-2-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 20 × Intel® Core™ i5-14600KF
Memory: 32 GiB of RAM (31.1 GiB usable)
Graphics Processor: AMD Radeon RX 9070 XT
ADDITIONAL INFORMATION
I found this was probably caused by a SIGSEGV segmentation fault and I used
coredumpctl to debug. It appears that when a display is temporarily
disconnected or its EDID is re-read.
-- backtrace:
PID: 113274 (kwin_wayland)
UID: 1000 (makoto)
GID: 1000 (makoto)
Signal: 11 (SEGV)
Timestamp: Thu 2026-05-14 20:18:02 CST (44min ago)
Command Line: /usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0
--xwayland-fd 8 --xwayland-fd 9 --xwayland-display :0 --xwayland-xauthority
/run/user/1000/xauth_MolrOe --xwayland
Executable: /usr/bin/kwin_wayland
Control Group:
/user.slice/user-1000.slice/[email protected]/session.slice/plasma-kwin_wayland.service
Unit: [email protected]
User Unit: plasma-kwin_wayland.service
Slice: user-1000.slice
Owner UID: 1000 (makoto)
Boot ID: 82cd387cb2be42d983bd56bdbb0e2887
Machine ID: 0be00530383242298f2a5f33ce3184f5
Hostname: cachyos
Storage:
/var/lib/systemd/coredump/core.kwin_wayland.1000.82cd387cb2be42d983bd56bdbb0e2887.113274.1778761082000000.zst
(present)
Size on Disk: 4.2M
Message: Process 113274 (kwin_wayland) of user 1000 dumped core.
Stack trace of thread 113274:
#0 0x00007f54e359b220
_ZN4KWin8LibInput10Connection19applyScreenToDeviceEPNS0_6DeviceE (libkwin.so.6
+ 0x59b220)
#1 0x00007f54e359c962
_ZN4KWin8LibInput10Connection13processEventsEv (libkwin.so.6 + 0x59c962)
#2 0x00007f54e06039f1 _ZN7QObject5eventEP6QEvent
(libQt6Core.so.6 + 0x2039f1)
#3 0x00007f54e1704cab
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 +
0x104cab)
#4 0x00007f54e0596448
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 +
0x196448)
#5 0x00007f54e05989c8
_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData
(libQt6Core.so.6 + 0x1989c8)
#6 0x00007f54e07b1a5b
_ZN20QEventDispatcherUNIX13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Core.so.6 + 0x3b1a5b)
#7 0x00007f54e13fe362
_ZN23QUnixEventDispatcherQPA13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Gui.so.6 + 0x7fe362)
#8 0x00007f54e05a5444
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 +
0x1a5444)
#9 0x00007f54e059acd4 _ZN16QCoreApplication4execEv
(libQt6Core.so.6 + 0x19acd4)
#10 0x00005629ac238692 n/a (/usr/bin/kwin_wayland + 0x3f692)
#11 0x00007f54dfc27c8e n/a (libc.so.6 + 0x27c8e)
#12 0x00007f54dfc27dcb __libc_start_main (libc.so.6 + 0x27dcb)
#13 0x00005629ac23f205 n/a (/usr/bin/kwin_wayland + 0x46205)
Stack trace of thread 113280:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113279:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca8178 n/a (libc.so.6 + 0xa8178)
#2 0x00007f54dfd3ba13 ppoll (libc.so.6 + 0x13ba13)
#3 0x00007f54dede55b7 n/a (libglib-2.0.so.0 + 0x6d5b7)
#4 0x00007f54dede56b2 g_main_context_iteration
(libglib-2.0.so.0 + 0x6d6b2)
#5 0x00007f54e08f498b
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Core.so.6 + 0x4f498b)
#6 0x00007f54e05a5444
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 +
0x1a5444)
#7 0x00007f54e06ea35e _ZN7QThread4execEv (libQt6Core.so.6 +
0x2ea35e)
#8 0x00007f54e0b6b249 n/a (libQt6DBus.so.6 + 0x3a249)
#9 0x00007f54e07b3b8a n/a (libQt6Core.so.6 + 0x3b3b8a)
#10 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#11 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113287:
#0 0x00007f54e0705420 _ZN10QArrayData10deallocateEPS_xx
(libQt6Core.so.6 + 0x305420)
#1 0x00007f54e0bccdd2 n/a (libQt6DBus.so.6 + 0x9bdd2)
#2 0x00007f54e0b5149d n/a (libQt6DBus.so.6 + 0x2049d)
#3 0x00007f54e0b56f73 n/a (libQt6DBus.so.6 + 0x25f73)
#4 0x00007f54e060cea5 n/a (libQt6Core.so.6 + 0x20cea5)
#5 0x00007f54e35980df n/a (libkwin.so.6 + 0x5980df)
#6 0x00007f54e06039f1 _ZN7QObject5eventEP6QEvent
(libQt6Core.so.6 + 0x2039f1)
#7 0x00007f54e1704cab
_ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent (libQt6Widgets.so.6 +
0x104cab)
#8 0x00007f54e0596448
_ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 +
0x196448)
#9 0x00007f54e05989c8
_ZN23QCoreApplicationPrivate16sendPostedEventsEP7QObjectiP11QThreadData
(libQt6Core.so.6 + 0x1989c8)
#10 0x00007f54e08f7e20 n/a (libQt6Core.so.6 + 0x4f7e20)
#11 0x00007f54dede402d n/a (libglib-2.0.so.0 + 0x6c02d)
#12 0x00007f54dede5558 n/a (libglib-2.0.so.0 + 0x6d558)
#13 0x00007f54dede56b2 g_main_context_iteration
(libglib-2.0.so.0 + 0x6d6b2)
#14 0x00007f54e08f498b
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Core.so.6 + 0x4f498b)
#15 0x00007f54e05a5444
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 +
0x1a5444)
#16 0x00007f54e06ea35e _ZN7QThread4execEv (libQt6Core.so.6 +
0x2ea35e)
#17 0x00007f54e07b3c1d n/a (libQt6Core.so.6 + 0x3b3c1d)
#18 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#19 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113281:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113283:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113318:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113320:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab34a pthread_cond_timedwait (libc.so.6 +
0xab34a)
#4 0x00007f54e07abb33
_ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x3abb33)
#5 0x00007f54e06e6906 n/a (libQt6Core.so.6 + 0x2e6906)
#6 0x00007f54e07b3b8a n/a (libQt6Core.so.6 + 0x3b3b8a)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113284:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113286:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113317:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113321:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca8178 n/a (libc.so.6 + 0xa8178)
#2 0x00007f54dfd3ba13 ppoll (libc.so.6 + 0x13ba13)
#3 0x00007f54dede55b7 n/a (libglib-2.0.so.0 + 0x6d5b7)
#4 0x00007f54dede56b2 g_main_context_iteration
(libglib-2.0.so.0 + 0x6d6b2)
#5 0x00007f54e08f498b
_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE
(libQt6Core.so.6 + 0x4f498b)
#6 0x00007f54e05a5444
_ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 +
0x1a5444)
#7 0x00007f54e06ea35e _ZN7QThread4execEv (libQt6Core.so.6 +
0x2ea35e)
#8 0x00007f54e07b3c1d n/a (libQt6Core.so.6 + 0x3b3c1d)
#9 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#10 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113319:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113285:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113282:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
Stack trace of thread 113316:
#0 0x00007f54dfcb4e22 n/a (libc.so.6 + 0xb4e22)
#1 0x00007f54dfca80e8 n/a (libc.so.6 + 0xa80e8)
#2 0x00007f54dfca84b3 n/a (libc.so.6 + 0xa84b3)
#3 0x00007f54dfcab090 pthread_cond_wait (libc.so.6 + 0xab090)
#4 0x00007f54cd046d6e n/a (libgallium-26.1.0-arch2.1.so +
0x646d6e)
#5 0x00007f54ccffa12d n/a (libgallium-26.1.0-arch2.1.so +
0x5fa12d)
#6 0x00007f54cd046cac n/a (libgallium-26.1.0-arch2.1.so +
0x646cac)
#7 0x00007f54dfcabd58 n/a (libc.so.6 + 0xabd58)
#8 0x00007f54dfd4a5dc n/a (libc.so.6 + 0x14a5dc)
ELF object binary architecture: AMD x86-64
GNU gdb (GDB) 17.2
Copyright (C) 2025 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /usr/bin/kwin_wayland...
(No debugging symbols found in /usr/bin/kwin_wayland)
⚠️ warning: Can't open file /memfd:JSVMStack:QtQml (deleted) during file-backed
mapping note processing
⚠️ warning: Can't open file /memfd:JSGCHeap:QtQml (deleted) during file-backed
mapping note processing
[New LWP 113274]
[New LWP 113280]
[New LWP 113279]
[New LWP 113287]
[New LWP 113281]
[New LWP 113283]
[New LWP 113318]
[New LWP 113320]
[New LWP 113284]
[New LWP 113286]
[New LWP 113317]
[New LWP 113321]
[New LWP 113319]
[New LWP 113285]
[New LWP 113282]
--Type <RET> for more, q to quit, c to continue without paging--c
[New LWP 113316]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0
--xwayland-fd 8 --xwayland-fd 9 --xwayland-display :0 --xwayland-xauthority
/run/user/1000/xauth_MolrOe --xwayland'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f54e359b220 in
KWin::LibInput::Connection::applyScreenToDevice(KWin::LibInput::Device*) ()
from /usr/lib/libkwin.so.6
[Current thread is 1 (Thread 0x7f54d89fbc80 (LWP 113274))]
--
You are receiving this mail because:
You are watching all bug changes.
