https://bugs.kde.org/show_bug.cgi?id=521214
Bug ID: 521214
Summary: kio_trash.so loops forever at 100% CPU on unreadable
USB drive sector
Classification: Frameworks and Libraries
Product: frameworks-kio
Version First unspecified
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Trash
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
DESCRIPTION
A kio_trash.so kioworker spawned by Dolphin kept running after all Dolphin
windows were closed. It ran for days at ~100% CPU. The system fan stayed at
100%, and journald/rsyslog wrote continuously because the worker repeatedly
triggered kernel I/O errors on a USB drive.
Steps/conditions:
1. USB drive mounted as /dev/sda.
2. Dolphin/Trash access apparently spawned kio_trash.so.
3. USB drive had an unreadable sector.
4. kio_trash.so continued running even after all Dolphin windows were closed.
5. It caused repeated read attempts and log spam until
killed/rebooted/unplugged.
OBSERVED RESULT
This caused sustained 100% CPU/fan use and continuous writes to the system disk
through journald/rsyslog for an entire weekend.
EXPECTED RESULT
kio_trash should not retry indefinitely when trash enumeration hits repeated
I/O errors on a removable drive. It should back off, surface an error, stop
scanning that device/path, and exit once the requester is gone. A bad USB drive
should not allow a kio_trash worker to run for days at 100% CPU and indirectly
cause unbounded journald/rsyslog writes.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 26.04 LTS
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2
Kernel Version: 7.0.0-22-generic (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD RYZEN AI MAX+ 395 w/ Radeon 8060S
Memory: 128 GiB of RAM (62.4 GiB usable)
Graphics Processor: Radeon 8060S Graphics
ADDITIONAL INFORMATION
Affected process observed:
/usr/lib/x86_64-linux-gnu/libexec/kf6/kioworker
/usr/lib/x86_64-linux-gnu/qt6/plugins/kf6/kio/kio_trash.so trash
local:/run/user/1000/dolphinBWkKiO.2.kioworker.socket
Process tree:
systemd,1 splash
└─systemd,1951 --user
└─kioworker,1094887
/usr/lib/x86_64-linux-gnu/qt6/plugins/kf6/kio/kio_trash.so trash
local:/run/user/1000/dolphinBWkKiO.2.kioworker.socket
Kernel log repeatedly showed:
I/O error, dev sda, sector 6073614352 op 0x0:(READ) flags 0x800000 phys_seg 1
prio class 2
blk_print_req_error: 2073326 callbacks suppressed
blk_print_req_error: 2082653 callbacks suppressed
iotop showed the stuck process as:
kioworker /usr/lib/x86_64-linux-gnu/qt6/plugins/kf6/kio/kio_trash.so trash
local:/run/user/1000/dolphinBWkKiO.2.kioworker.socket
with extremely high accumulated disk read.
The USB drive having an unreadable sector is understood. The bug report is
about kio_trash apparently retrying without limit/backoff and continuing after
Dolphin was closed, turning a removable-drive read error into days of 100% CPU
and log writes.
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