While it was severe for me (log partition filled up) this seem to be so unusual hardware so i set severity normal anyhow. I filed the bug originally at https://bugs.mageia.org/show_bug.cgi?id=10038 - for more info see there. At that time the symptom was like https://bugzilla.kernel.org/show_bug.cgi?id=43191 That was years ago, never fixed. Log message changed completely a couple years ago, and maybe it is not the same issue... so i create a new bug here to see if someone may recognise it. The logging flood it is caused by the same procedure with same hardware in same circumstance as i used before. If i have the SD card in the camera and plug it into the computer USB, it is recognised and Plasma pops up dialog, it can mount, browse etc the SD card OK. But if i plug it in without SD card, and also if i later unplug it, the logs are filling up with repeated messages. Both /var/log/messages and /var/log/syslog grows. When i connect the camera to USB in without SD card spews to /var/log/messages a couple hundred lines of: Aug 25 17:34:39 svarten systemd-udevd[31234]: inotify_add_watch(9, /dev/sdd, 10) failed: No such file or directory End then: Aug 25 17:34:39 svarten kernel: [ 9469.213241] scsi 10:0:0:0: Direct-Access GENPLUS USB-MSDC DISK A 1.00 PQ: 0 ANSI: 0 Aug 25 17:34:39 svarten systemd-udevd[31234]: inotify_add_watch(9, /dev/sdd, 10) failed: No such file or directory Aug 25 17:34:39 svarten kernel: [ 9469.215607] sd 10:0:0:0: [sdd] Test WP failed, assume Write Enabled Aug 25 17:34:39 svarten kernel: [ 9469.216735] sd 10:0:0:0: [sdd] Asking for cache data failed Aug 25 17:34:39 svarten kernel: [ 9469.216737] sd 10:0:0:0: [sdd] Assuming drive cache: write through Aug 25 17:34:39 svarten kernel: [ 9469.217102] sd 10:0:0:0: [sdd] Attached SCSI removable disk And stops. Acceptable so far. *But when i then unplug it from USB it starts again spewing lines* like Aug 25 17:37:41 svarten systemd-udevd[31234]: inotify_add_watch(9, /dev/sdd, 10) failed: No such file or directory About a hundred lines per second! Logging stops like above if i plug in the camera again - but interestingly systemd-udevd still occupies one CPU core 100%. If i insert the SD card, and then plug in the camera, the SD is not found, and one CPU is still running full. I have to reboot in order to connect to the camera. For me personally this is not a big problem. My concern is that i do not like system going down by just briefly attaching an USB device...! I am not a coder, just a serious user. So, if someone is willing to dig into it i am willing to donate my miniature camera that is triggering this behaviour (at least have on Mageia 2,3,4,5,6 64 bit on this machine) The camera was sold as Velleman CAMCOLVC8N1 keychain video camera.