On 03/02/2020 18:16, John Garry wrote:

On 03/02/2020 15:43, Marc Zyngier wrote:

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On 2020-02-03 12:56, John Garry wrote:

[...]

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Can you trigger it after disabling irqbalance?

No, so tested by killing the irqbalance process and it ran for 25
minutes without issue.

OK, that's interesting.

Can you find you whether irqbalance tries to move an interrupt to an 
offlined CPU?
Just putting a trace into git_set_affinity() should be enough.

Just an update here: I have tried this same test on a new model dev 
board and I don't experience the same issue. It's quite stable.

I'd like to get to the bottom of the issue reported, but I feel that the 
root cause may be a BIOS issue and I will get next to no BIOS support 
for that particular board. Hmmm.

Thanks,
John