https://bugs.kde.org/show_bug.cgi?id=501141
Bug ID: 501141
Summary: Kwin crashed when I connected second display.
Classification: Plasma
Product: kwin
Version: 6.3.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: ar...@unrivaled.ir
Target Milestone: ---
I recently purchased an LG UltraGear 27GS60QC-B monitor and have been using it
with a DisplayPort connection. My previous monitor, a Samsung S20B315B plus,
was connected via DVI. Today, I decided to compare both monitors side-by-side
and reconnected the old monitor for a test.
The following issues occurred during and after the comparison:
1. After connecting the Samsung monitor, the display went black and the
system froze.
2. I disconnected the old monitor, and after 1-2 minutes, the system
recovered.
3. However, several applications (Firefox, Inkscape, Telegram Desktop)
appeared to be crashed or functionally impaired, while only "Konsole" and
"Dolphin" continued to work normally.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
ADDITIONAL INFORMATION:
```
Mar 06 14:18:09 unrivaled plasmashell[1121]: QFont::setPointSizeF: Point size
<= 0 (0.000000), must be greater than 0
Mar 06 14:19:07 unrivaled kded6[1069]: Service ":1.525" unregistered
Mar 06 14:19:10 unrivaled plasmashell[1121]: The cached device pixel ratio
value was stale on window update. Please file a QTBUG which explains how to
reproduce.
Mar 06 14:19:11 unrivaled plasmashell[1121]: The cached device pixel ratio
value was stale on window update. Please file a QTBUG which explains how to
reproduce.
Mar 06 14:19:12 unrivaled rtkit-daemon[869]: Successfully made thread 119794 of
process 1775 owned by '1000' RT at priority 20.
Mar 06 14:19:12 unrivaled rtkit-daemon[869]: Supervising 11 threads of 8
processes of 1 users.
Mar 06 14:19:12 unrivaled kded6[1069]: Registering ":1.527/StatusNotifierItem"
to system tray
Mar 06 14:19:12 unrivaled plasmashell[1121]: QFont::setPointSizeF: Point size
<= 0 (0.000000), must be greater than 0
Mar 06 14:20:18 unrivaled kded6[1069]: Service ":1.527" unregistered
Mar 06 14:21:00 unrivaled kwin_wayland[915]: kwin_core: Applying output config
failed!
Mar 06 14:21:00 unrivaled kwin_wayland_wrapper[915]: KCrash: Application
'kwin_wayland' crashing... crashRecursionCounter = 2
Mar 06 14:21:00 unrivaled systemd-coredump[119831]: Process 915 (kwin_wayland)
of user 1000 terminated abnormally with signal 11/SEGV, processing...
Mar 06 14:21:00 unrivaled systemd[1]: Created slice Slice
/system/drkonqi-coredump-processor.
Mar 06 14:21:00 unrivaled systemd[1]: Created slice Slice
/system/systemd-coredump.
Mar 06 14:21:00 unrivaled systemd[1]: Started Process Core Dump (PID 119831/UID
0).
Mar 06 14:21:00 unrivaled systemd[1]: Started Pass systemd-coredump journal
entries to relevant user for potential DrKonqi handling.
Mar 06 14:21:03 unrivaled systemd-coredump[119832]: [🡕] Process 915
(kwin_wayland) of user 1000 dumped core.
Stack trace of thread 915:
#0 0x00007702a4ea5624 n/a
(n/a + 0x0)
#1 0x00007702a4e4bba0 n/a
(n/a + 0x0)
#2 0x00007702a872c4da n/a
(n/a + 0x0)
#3 0x00007702a4e4bcd0 n/a
(n/a + 0x0)
#4 0x00007702a823a7eb n/a
(n/a + 0x0)
#5 0x00007702a823c509 n/a
(n/a + 0x0)
#6 0x00007702a7f7ae40 n/a
(n/a + 0x0)
#7 0x00007702a55b1a49 n/a
(n/a + 0x0)
#8 0x00007702a7f90a45 n/a
(n/a + 0x0)
#9 0x00007702a7f95013 n/a
(n/a + 0x0)
#10 0x00007702a55b1a49 n/a
(n/a + 0x0)
#11 0x00007702a55baa75 n/a
(n/a + 0x0)
#12 0x00007702a55a2ef9 n/a
(n/a + 0x0)
#13 0x00007702a68ff0ca n/a
(n/a + 0x0)
#14 0x00007702a5555b00 n/a
(n/a + 0x0)
#15 0x00007702a56d5aff n/a
(n/a + 0x0)
#16 0x00007702a56de408 n/a
(n/a + 0x0)
#17 0x00007702a6261d93 n/a
(n/a + 0x0)
#18 0x00007702a55606a6 n/a
(n/a + 0x0)
#19 0x00007702a55591d6 n/a
(n/a + 0x0)
#20 0x00005cae6c1ac07f n/a
(n/a + 0x0)
#21 0x00007702a4e35488 n/a
(n/a + 0x0)
#22 0x00007702a4e3554c n/a
(n/a + 0x0)
#23 0x00005cae6c1b23f5 n/a
(n/a + 0x0)
ELF object binary
architecture: AMD x86-64
Mar 06 14:21:04 unrivaled systemd[1]: systemd-coredump@0-119831-0.service:
Deactivated successfully.
Mar 06 14:21:04 unrivaled systemd[1]: systemd-coredump@0-119831-0.service:
Consumed 1.550s CPU time, 1G memory peak.
Mar 06 14:21:04 unrivaled drkonqi-coredump-processor[119833]:
"/usr/bin/kwin_wayland" 915
"/var/lib/systemd/coredump/core.kwin_wayland.1000.1574c48b6cf049e6ad7943efa0c6684e.915.1741258260000000.zst"
Mar 06 14:21:04 unrivaled systemd[831]: Started Launch DrKonqi for a
systemd-coredump crash (PID 119833/UID 0).
Mar 06 14:21:04 unrivaled inkscape[46296]: Error reading events from display:
Broken pipe
Mar 06 14:21:04 unrivaled konsole[46395]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled konsole[46395]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled systemsettings[99133]: The Wayland connection broke.
Did the Wayland compositor die?
Mar 06 14:21:04 unrivaled systemsettings[99133]: qt.qpa.wayland: Attempting
wayland reconnect
Mar 06 14:21:04 unrivaled kwin_wayland_wrapper[997]: (EE) failed to read
Wayland events: Broken pipe
Mar 06 14:21:04 unrivaled kiod6[30129]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled kiod6[30129]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled dolphin[65174]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled krunner[3512]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled dolphin[65174]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled xdg-desktop-por[1392]: Error reading events from
display: Broken pipe
Mar 06 14:21:04 unrivaled xdg-desktop-portal-kde[1507]: The Wayland connection
broke. Did the Wayland compositor die?
Mar 06 14:21:04 unrivaled kwalletd6[847]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled kwalletd6[847]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled systemsettings[99133]: Failed to write to the pipe:
Bad file descriptor.
Mar 06 14:21:04 unrivaled systemsettings[99133]: qt.qpa.wayland: There are no
outputs - creating placeholder screen
Mar 06 14:21:04 unrivaled kwalletd6[847]: Failed to write to the pipe: Bad file
descriptor.
Mar 06 14:21:04 unrivaled telegram-desktop[1775]: The Wayland connection broke
during blocking read event. Did the Wayland compositor die?
Mar 06 14:21:04 unrivaled kwalletd6[847]: qt.qpa.wayland: There are no outputs
- creating placeholder screen
Mar 06 14:21:04 unrivaled DiscoverNotifier[1399]: The Wayland connection broke.
Did the Wayland compositor die?
Mar 06 14:21:04 unrivaled DiscoverNotifier[1399]: qt.qpa.wayland: Attempting
wayland reconnect
Mar 06 14:21:04 unrivaled kgpg[1404]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled kgpg[1404]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled kiod6[30129]: Failed to write to the pipe: Bad file
descriptor.
Mar 06 14:21:04 unrivaled kiod6[30129]: qt.qpa.wayland: There are no outputs -
creating placeholder screen
Mar 06 14:21:04 unrivaled kalarm[1713]: The Wayland connection broke. Did the
Wayland compositor die?
Mar 06 14:21:04 unrivaled kalarm[1713]: qt.qpa.wayland: Attempting wayland
reconnect
Mar 06 14:21:04 unrivaled kalarm[1713]: Failed to write to the pipe: Bad file
descriptor.
Mar 06 14:21:04 unrivaled kalarm[1713]: qt.qpa.wayland: There are no outputs -
creating placeholder screen
Mar 06 14:21:04 unrivaled konsole[46395]: Failed to write to the pipe: Bad file
descriptor.
Mar 06 14:21:04 unrivaled konsole[46395]: qt.qpa.wayland: There are no outputs
- creating placeholder screen
Mar 06 14:21:04 unrivaled kdeconnectd[1383]: 2025-03-06T14:21:04 default: The
Wayland connection broke. Did the Wayland compositor die?
Mar 06 14:21:04 unrivaled kdeconnectd[1383]: 2025-03-06T14:21:04
qt.qpa.wayland: Attempting wayland reconnect
Mar 06 14:21:04 unrivaled polkit-kde-authentication-agent-1[1191]: The Wayland
connection broke. Did the Wayland compositor die?
```
full log is here: https://paste.ubuntu-ir.org/oenu
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