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Linux: balloon_process() causing workqueue lockups?
- To: Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 27 Aug 2021 11:01:30 +0200
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- Delivery-date: Fri, 27 Aug 2021 09:01:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
ballooning down Dom0 by about 16G in one go once in a while causes:
BUG: workqueue lockup - pool cpus=6 node=0 flags=0x0 nice=0 stuck for 64s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
in-flight: 229:balloon_process
pending: cache_reap
workqueue events_freezable_power_: flags=0x84
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: disk_events_workfn
workqueue mm_percpu_wq: flags=0x8
pwq 12: cpus=6 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
pending: vmstat_update
pool 12: cpus=6 node=0 flags=0x0 nice=0 hung=64s workers=3 idle: 2222 43
I've tried to double check that this isn't related to my IOMMU work
in the hypervisor, and I'm pretty sure it isn't. Looking at the
function I see it has a cond_resched(), but aiui this won't help
with further items in the same workqueue.
Thoughts?
Thanks, Jan
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