Re: "default" watchdog device - ?

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On 15/03/2022 11:21, Daniel P. Berrangé wrote:
On Tue, Mar 15, 2022 at 10:39:50AM +0000, lejeczek wrote:
Hi guys.

Without explicitly, manually using watchdog device for a VM, the VM (centOS
8 Stream 4.18.0-365.el8.x86_64) shows '/dev/watchdog' exists.
To double check - 'dumpxml' does not show any such device - what kind of a
'watchdog' that is?
The kernel can always provide a pure software watchdog IIRC. It can be
useful if a userspace app wants a watchdog. The limitation is that it
relies on the kernel remaining functional, as there's no hardware
backing it up.

On a related note - with 'i6300esb' watchdog which I tested and I believe is working.
I get often in my VMs from 'dmesg':
watchdog: BUG: soft lockup - CPU#0 stuck for xxxs! [swapper/0:0]
rcu: INFO: rcu_sched self-detected stall on CPU
This above is from Ubuntu and CentOS alike and when this happens, console via VNC responds to until first 'enter' then is non-resposive. This happens after VM(s) was migrated between hosts, but anyway.. I do not see what I expected from 'watchdog' - there is no action whatsoever, which should be 'reset'. VM remains in such 'frozen' state forever.

any & all shared thoughts much appreciated.

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