https://bugs.kde.org/show_bug.cgi?id=523534
Bug ID: 523534
Summary: Summary: kioworker/thumbnail.so hangs indefinitely on
a .docx file, reproducible on KIO 6.28.0 (after the
504067 timeout fix)
Classification: Frameworks and Libraries
Product: frameworks-kio
Version First 6.28.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
STEPS TO REPRODUCE
1. Open a folder containing a specific .docx file in Dolphin, with
"Documents" previews enabled
2. Observe kioworker/thumbnail.so spawn for that file
3. It never terminates on its own
OBSERVED RESULT
Multiple kioworker processes running thumbnail.so get stuck at
84-96% CPU indefinitely (30+ minutes observed before manual kill).
They persist even after fully closing Dolphin -- they are orphaned
from the Dolphin session that spawned them (visible in the
local:/run/user/1000/dolphin*.kioworker.socket argument).
Example from `ps aux`:
kioworker /usr/lib/kf6/kioworker /usr/lib/qt6/plugins/kf6/kio/thumbnail.so
thumbnail local:/run/user/1000/dolphinjrMIDi.15.kioworker.socket -- 84.8%
CPU, 31:55 CPU time
kioworker /usr/lib/kf6/kioworker /usr/lib/qt6/plugins/kf6/kio/thumbnail.so
thumbnail local:/run/user/1000/dolphinObUOdC.20.kioworker.socket -- 96.3% CPU,
31:57 CPU time
kioworker /usr/lib/kf6/kioworker /usr/lib/qt6/plugins/kf6/kio/thumbnail.so
thumbnail local:/run/user/1000/dolphinCQdvRa.21.kioworker.socket -- 96.2% CPU,
31:56 CPU time
kioworker /usr/lib/kf6/kioworker /usr/lib/qt6/plugins/kf6/kio/thumbnail.so
thumbnail local:/run/user/1000/dolphinOMTner.22.kioworker.socket -- 96.2% CPU,
31:55 CPU time
Inspecting one stuck process's open file descriptors
(ls -la /proc/<pid>/fd/) shows the target .docx file open read-only,
plus 4 anonymous temp files created and unlinked
(/tmp/#NNNN (deleted)), suggesting the office-document thumbnail
renderer creates working files and hangs mid-processing without
cleaning up or timing out.
EXPECTED RESULT
Thumbnail generation should succeed or fail within a reasonable
time, without pegging a CPU core indefinitely.
ADDITIONAL INFO
This reproduces on KIO 6.28.0-1, well after the generic timeout fix
from bug 504067 (merged in 6.24). This suggests either this specific
code path in the office-document thumbnailer isn't covered by that
timeout, or this is a related-but-distinct issue.
See Also: bug 504067 (RESOLVED FIXED in 6.24), bug 503319 (kio-extras,
similar indefinite hang on .3mf files, still open)
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.7.3
KDE Frameworks Version: 6.28.0
Qt Version: 6.11.1
Kernel Version: 7.1.3-arch2-2 (64bit)
KIO package version: 6.28.0-1
wayland
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