http://bugzilla.suse.com/show_bug.cgi?id=1106840 Bug ID: 1106840 Summary: Kernel: BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 14032s! Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.0 Hardware: Other OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel Assignee: kernel-maintainers@forge.provo.novell.com Reporter: mjuffermans@paradigmone.com.au QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- Created attachment 781634 --> http://bugzilla.suse.com/attachment.cgi?id=781634&action=edit Output of hwinfo for virtual guest Once or twice a week we get a series of "BUG: workqueue lockup" messages in the journal. For example, today we had a whole series of them, the last three being: Sep 02 06:01:29 nocc kernel: BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 14186s! Sep 02 06:01:29 nocc kernel: Showing busy workqueues and worker pools: Sep 02 06:01:29 nocc kernel: workqueue events: flags=0x0 Sep 02 06:01:29 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 Sep 02 06:01:29 nocc kernel: pending: vmstat_shepherd, cache_reap, wakeup_dirtytime_writeback Sep 02 06:01:29 nocc kernel: workqueue events_long: flags=0x0 Sep 02 06:01:29 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:01:29 nocc kernel: pending: gc_worker [nf_conntrack] Sep 02 06:01:29 nocc kernel: workqueue mm_percpu_wq: flags=0x8 Sep 02 06:01:29 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:01:29 nocc kernel: pending: vmstat_update Sep 02 06:01:59 nocc kernel: BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 14217s! Sep 02 06:01:59 nocc kernel: Showing busy workqueues and worker pools: Sep 02 06:01:59 nocc kernel: workqueue events: flags=0x0 Sep 02 06:01:59 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 Sep 02 06:01:59 nocc kernel: pending: vmstat_shepherd, cache_reap, wakeup_dirtytime_writeback Sep 02 06:01:59 nocc kernel: workqueue events_long: flags=0x0 Sep 02 06:01:59 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:01:59 nocc kernel: pending: gc_worker [nf_conntrack] Sep 02 06:01:59 nocc kernel: workqueue mm_percpu_wq: flags=0x8 Sep 02 06:01:59 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:01:59 nocc kernel: pending: vmstat_update Sep 02 06:02:30 nocc kernel: BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 14247s! Sep 02 06:02:30 nocc kernel: Showing busy workqueues and worker pools: Sep 02 06:02:30 nocc kernel: workqueue events: flags=0x0 Sep 02 06:02:30 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 Sep 02 06:02:30 nocc kernel: pending: vmstat_shepherd, cache_reap, wakeup_dirtytime_writeback Sep 02 06:02:30 nocc kernel: workqueue events_long: flags=0x0 Sep 02 06:02:30 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:02:30 nocc kernel: pending: gc_worker [nf_conntrack] Sep 02 06:02:30 nocc kernel: workqueue mm_percpu_wq: flags=0x8 Sep 02 06:02:30 nocc kernel: pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 Sep 02 06:02:30 nocc kernel: pending: vmstat_update So it's been stuck for about 3.5 hours. There are no other messages in the journal in between these messages. It happens on several machines, seemingly at random. The machines are all paravirtualized running on Xen 4.10. We can't find anything in the journal of the virtual host during the time of lockup. The output of hwinfo for the virtual guest is attached. -- You are receiving this mail because: You are on the CC list for the bug.