https://bugs.kde.org/show_bug.cgi?id=513197
Bug ID: 513197
Summary: Creating ⪆ 111 tabs causes the shell to render error
messages, rarely as text, more frequently as “□”. If
interacted with, or if the user creates > 10 more
tabs, Konsole forcefully closes, causing some shells
to SEGV
Classification: Applications
Product: konsole
Version First 25.08.3
Reported In:
Platform: Fedora RPMs
URL: https://discussion.fedoraproject.org/t/why-does-debugi
nfod-lack-symbols-for-dotnet-packages/156270/15
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: single-process
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 187508
--> https://bugs.kde.org/attachment.cgi?id=187508&action=edit
A Screenshot Of The “□”s
# SUMMARY
Creating ⪆ 111 tabs causes the shell to render error messages, rarely as text,
more frequently as “□”. If interacted with, or if the user creates > 10 more
tabs, Konsole forcefully closes, causing some shells to SEGV.
# STEPS TO REPRODUCE
1. Invoke Konsole.
2. Create ⪆ 111 tabs to produce the two lines of “□”s.
At this point, if one interacts with the tab, the effect is
problematic, and detailed below. Similarly, if the user moves the Konsole
window, the effect is also problematic, and detailed below.
3. Create ⪆ 137 tabs, to cause at least "xdg_surface#46: error 3: attached
a buffer before configure event" to appear.
Because Konsole disables holding the Control + Shift + T keys, utilise the
undermentioned pseudocode as a reference for how to automate this. However,
I'll note that this merely requires 20 s by hand, so it's solely worth
automating if you've an RSI.
~~~
#!/usr/bin/env sh
plasmashell &
pkcon install konsole && \
konsole &
pkcon install kdotool && \
kdotool search --class konsole windowactivate && \
pkcon install ydotool && \
run0 ydotoold && \
run0 "$(echo $0) -c 'while true; do ydotool key 29:1 42:1 20:1 20:0 42:0 29:0;
done' && \
konsole -c "$(echo $0) -c \"time while true; do kquitapp6 plasmashell; done\""
~~~
# OBSERVED RESULT
If one creates ⋛ 112 tabs, then right-clicks, or selects, the “□”s, the
terminal closes with “file descriptor expected, object (57), message send(sh)”.
If, instead, they move it, the window disappears, and a thumbnail cannot be
generated for it by `plasmashell`'s Task Manager.
However, if one merely creates ⪆ 137 tabs, as above, they see a subset (at
least) of:
~~~
RokeJulianLockhart@Beedell:~$ konsole
QProcess: Cannot create pipe (Too many open files)
QProcess: Cannot create pipe (Too many open files)
kf.pty: Can't open a pseudo teletype
org.kde.konsole: foregroundProcessGroup master_fd < 0
org.kde.konsole: foregroundProcessGroup master_fd < 0
QProcess: Cannot create pipe (Too many open files)
QProcess: Cannot create pipe (Too many open files)
org.kde.konsole: foregroundProcessGroup master_fd < 0
org.kde.konsole: foregroundProcessGroup master_fd < 0
kf.pty: Can't open a pseudo teletype
org.kde.konsole: foregroundProcessGroup master_fd < 0
org.kde.konsole: foregroundProcessGroup master_fd < 0
QProcess: Cannot create pipe (Too many open files)
QProcess: Cannot create pipe (Too many open files)
QWaylandShmBuffer: failed: Too many open files
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::save: Painter not active
QPainter::setBrush: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::save: Painter not active
QPainter::setBrush: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::setClipRegion: Painter not active
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::drawPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::pen: Painter not active
QPainter::setPen: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setPen: Painter not active
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::save: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::drawRects: Painter not active
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::save: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::drawRects: Painter not active
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::setBrush: Painter not active
QPainter::setPen: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::save: Painter not active
QPainter::save: Painter not active
QPainter::hasClipping: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::save: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::restore: Unbalanced save/restore
xdg_surface#46: error 3: attached a buffer before configure event
The Wayland connection experienced a fatal error: Protocol error
~~~
# EXPECTED RESULT
Instead of allowing me to create 111 tabs, Konsole should at least warn me of
the consequences, and provide user interaction to create the 111th. Otherwise,
it should not permit > 110 tabs.
# SOFTWARE/OS VERSIONS
~~~
Name : konsole
Version : 25.08.3
Release : 1.fc43
Architecture: x86_64
Install Date: Sat 15 Nov 2025 16:00:29 GMT
Signature :
RSA/SHA256, Thu 13 Nov 2025 14:09:56 GMT, Key ID 829b606631645531
Build Date : Wed 12 Nov 2025 21:02:07 GMT
Build Host : buildvm-x86-24.rdu3.fedoraproject.org
Packager : Fedora Project
Vendor : Fedora Project
Bug URL : https://bugz.fedoraproject.org/konsole
~~~
# ADDITIONAL INFORMATION
This was originally noticed when diagnosing <
https://github.com/lxqt/qterminal/issues/1309#issuecomment-3633388780, which
demonstrates this affects any terminal Similarly, what
https://discussion.fedoraproject.org/t/why-does-debuginfod-lack-symbols-for-dotnet-packages/156270/15
cites demonstrates that this affects any shell.
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