Install sysstat and the next event you should have performance data, and/or leave top running in say a window and one of the virt terminals. The task hung is caused by 100's of different issues, the usually one I see is high swap usage slowing everything down (it typically happens at least 10x more than the real bugs, and whoever is reporting it to me typically googles and includes a bug like that stating that they have one of the many "bugs" that have those messages in it). The fact that yours shutdowns indicates it is probably swap/memory usage. When you get most of the real task hung bugs shutdown won't ever finish and you will have to force it off as the messages is reporting it hung for XX seconds, but really it will never get out the the deadlock, or whatever needs to do will never complete. On my laptop (32gb) I only get a tiny bit slow when firefox and/or chrome uses excessive memory, on my machine with 10gb it gets unusable, and often I find one of the browsers using almost all of my ram. It seems to correlate to certain web pages, and its timing seems to be rather random and often it seems to happen unattended. On the 32gb laptop when it gets slow enough that I notice I find what is using all of the ram and kill it and that clears up the issue. Excessive swap usage will cause shutdown to be really slow. On Thu, Apr 23, 2020 at 7:26 AM Ed Greshko <ed.greshko@xxxxxxxxxxx> wrote: > > On 2020-04-23 20:06, ToddAndMargo via users wrote: > > On 2020-04-23 03:53, ToddAndMargo via users wrote: > >> Fedora 31, x64 > >> Xfce 4.14 > >> > >> Shutdown hangs: > >> https://bugzilla.redhat.com/show_bug.cgi?id=1815686 > >> > >> Hi All, > >> > >> Randomly and not associated with any particular program, > >> my system will slow down. It becomes obvious when I can > >> type faster than letters appear. And when this happens, > >> a reboot will fix it. > >> > >> But the shutdown and reboot process hangs when the > >> slowdown appears. After the shutdown/reboot sequence > >> gets to "Target Reached Power Off" (or restart), a > >> delay of about two minutes and then I get my CPU > >> registries displayed over and over. > >> > >> Looks like this: > >> repeating CPU registries: > >> https://bugzilla.redhat.com/attachment.cgi?id=1672106 > >> > >> This is my dmesg: > >> # journalctl -b --no-hostname -k > dmesg.tx > >> https://bugzilla.redhat.com/attachment.cgi?id=1672107 > >> > >> This has happened three times in one day. It has also > >> gone for days without an issue. > >> > >> And again, no particular program either. I initially > >> thought it was qemu-kvm, then VLC, but it has happened > >> with neither running. And just sitting at the desktop > >> with the screen saver running. > >> > >> Any words of wisdom? > >> > >> Many thanks, > >> -T > > > > Also, when this happens, backups (dump, tar) take about > > eight times long to complete. > > > > And to just be clear, if no slow down is apparent, shutdown > > and reboot work perfectly: they do not hang > > So, you're saying that if you see a slowdown then you'll have the issue with reboot/shutdown. > That would suggest to me that determining the cause of the slowdown is most important. > > When the slowdown happens, can you switch to another VT (ctrl-alt-F2) or ssh in from elsewhere > and see if there is any unusual CPU or I/O activity? > > It sounds as if this issue happens for you frequently? And, are you still on the kernel shown in the > BZ? There have been updates to the kernel since that time. > > > -- > The key to getting good answers is to ask good questions. > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx > 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/users@xxxxxxxxxxxxxxxxxxxxxxx _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx 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/users@xxxxxxxxxxxxxxxxxxxxxxx
