Hi Philippe, I somehow met the same issue before and confirmed that kioworker was unfortunately stuck while generating the thumbnail of a file.
`sudo strace -p <PID>` and `lsof -p <PID>` may help you find the file that causes the issue. You can then work around the bug by disabling thumbnail generation for the affected MIME type. In my case, it was a DOCX file. $ sudo strace -p <PID> lseek(11, 5557, SEEK_SET) = 5557 lseek(11, 5557, SEEK_SET) = 5557 lseek(11, 5557, SEEK_SET) = 5557 [...] $ lsof -p <PID> kioworker <PID> rongrong 11r REG <DEVICE> <SIZE/OFF> <NODE> /path/to/a.docx It is impossible for me to provide a reproducer to the devs, as the file itself is confidential. Thus, I've never reported the issue. If you find you are facing the same issue and if the file is not confidential, please report it to the KDE devs. Rong On Sat, 2025-04-26 at 12:58 +0200, MERLIN Philippe wrote: > Hello, > For some time now, I've been having problems with my Debian SID AMD64. I've > already reported it to the list about the screen blocking and the mouse > becoming > inoperative. The users recommended certain tests to diagnose the cause of the > problem. I ran memtest86 overnight without any problems. However, upon > further > investigation, I noticed that the processor temperatures were very high, > approaching 100°C (96.97°C). The fans were operating normally. I thought it > was a > thermal paste problem. A technician ran some tests without Linux, and the > processor temperatures were normal, even under load, at a maximum of 76°C. He > suggested the problem might be with an application. I launched: *top* > and* *I noticed that a kioworker process was constantly using 100% CPU. Why? > Is this the culprit? Where should I look? Kioworker seems to be a KDE > process, so I'll > send an email to the KDE list asking for help. > Thanks in advance for your contributions. > Philippe Merlin
