Run this and see if there are any large kernel structures. sudo cat /proc/slabinfo | sort -k 15n | tail -10
The one I have see a problem with on a filesystem umount (a long delay) is dentry being greater than 20 million. The higher dentry is the longer the delay. On Thu, Dec 18, 2025 at 7:03 PM George R Goffe via users <[email protected]> wrote: > > Barry, > > From the bugzilla.redhat.com website I got some information which I tried. IT > WORKED!!! Yay... but, there's more... :( > > I ran these commands: > > dnf install fedora-repos-rawhide > > followed by > > dnf update --enablerepo=rawhide kernel > > > These two commands got me to kernel 6.17.12-200.fc42.x86_64+debug > > The panic has gone but in its place are some strange error(?) messages that > are meaningless to me (see below). I couldn't find much info on the web about > these messages. What I did find is vague suggestions(?) like "update your > workqueue settings" but just where they are located is STILL a mystery. Sigh. > > MSGS: > > [Thu Dec 18 16:00:32 2025] workqueue: drm_fb_helper_damage_work hogged CPU > for >10000us 4 times, consider switching to WQ_UNBOUND > [Thu Dec 18 16:00:32 2025] workqueue: drm_fb_helper_damage_work hogged CPU > for >10000us 5 times, consider switching to WQ_UNBOUND > [Thu Dec 18 16:00:33 2025] workqueue: drm_fb_helper_damage_work hogged CPU > for >10000us 7 times, consider switching to WQ_UNBOUND > > > I got these messages after a umount of a 24TB btrfs filesystem which took a > (relatively) LONG TIME `1 minute. Usually this happens REALLY quickly. Sigh... > > A subsequent reboot froze the system (which had trouble finishing shutting > down) for several minutes. The system finally "woke up" when I powered off > the 24TB external USB connected hard drive. > > I'm trying to submit bugs for abrt which produces a REALLY NICE "details" > popup... It's NOT "enabled" for copy/paste operations though... Yet another > bug report. ARGH! > > > > -- > _______________________________________________ > users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/[email protected] > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue -- _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
