https://bugs.kde.org/show_bug.cgi?id=521419
Bug ID: 521419
Summary: Wayland Neon Unstable crashes as VM guest
Classification: KDE Neon
Product: neon
Version First unspecified
Reported In:
Platform: Neon
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: Live/Install images
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
Created attachment 193124
--> https://bugs.kde.org/attachment.cgi?id=193124&action=edit
/usr
DESCRIPTION
When running Neon Unstable in a VM with virtio graphics, a logon attempt takes
you back to the logon prompt after a pause. A coredumpctl list shows a
significant number of crashes, starting with a SIGSEGV in /usr/lib/kwin_wayland
(gdb) bt
#0 __pthread_kill_implementation (no_tid=0, signo=11, threadid=<optimized
out>) at ./nptl/pthread_kill.c:44
#1 __pthread_kill_internal (signo=11, threadid=<optimized out>) at
./nptl/pthread_kill.c:78
#2 __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=11) at
./nptl/pthread_kill.c:89
#3 0x00007a450e84527e in __GI_raise (sig=11) at
../sysdeps/posix/raise.c:26
#4 0x00007a4513a9af6a in KCrash::defaultCrashHandler(int) () from
/lib/x86_64-linux-gnu/libKF6Crash.so.6
#5 <signal handler called>
#6 0x00007a44fdb6aa5a in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#7 0x00007a44fdb6acf3 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#8 0x00007a44fdc6599e in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#9 0x00007a44fdc66453 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#10 0x00007a44fdc66577 in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#11 0x00007a44fd999e0c in ?? () from
/lib/x86_64-linux-gnu/libgallium-25.2.8-0ubuntu0.24.04.1.so
#12 0x00007a450e89caa4 in start_thread (arg=<optimized out>) at
./nptl/pthread_create.c:447
#13 0x00007a450e929c6c in clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
STEPS TO REPRODUCE
1. Install Neon Unstable (neon-unstable-20260612-0623.iso)
2. Ensure the Video is virtio
3. Run the image...
OBSERVED RESULT
As described above, the logon fails and there's a crashdump.
SOFTWARE/OS VERSIONS
Neon Unstable
KDE Plasma: 6.7.80
KDE Frameworks: 6.27.0
Qt: 6.11.1
Graphics Platform: Wayland
ADDITIONAL INFORMATION
Repeating the test with QXL graphics, you do not get the crash but the display
flickers when you move the mouse, sometimes leaving the screen blank, sometimes
showing the desktop. (It is possible to navigate via keyboard plus, enough to
install sshd)
This happens with a new install (neon-unstable-20260612-0623.iso), my earlier
test system had been using X11 without issues. A similar test with Wayland on
KDE Linux shows no problems
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