panic: ipi_send: couldn't send ipi

[Andrew Belashov]

Kris Kennaway wrote:
>>Thank you very much for testing this out.
>>
>>Unless someone thinks this would be a problem I'll wait another couple
>>of days and if nobody else has any further input I'll leave the existing
>>code as-is but bump the max retries to 5000 for the 5.3 release.  I'm
>>still curious about what the underlying problem is but it'll take some
>>time to track down I think.  I did manage to find a machine to test
>>this on late yesterday and some initial attempts at triggering the
>>problem by generating a lot of disk I/O didn't seem to trigger it.
>>
>>Your case seems to be a bit extreme - I'm wondering if it has something
>>to do with the Creator 3D.  I don't think it is the only thing that can
>>cause the problem to crop up but it might be something that makes the
>>situation "worse".
>>
>>Kris, was your problem machine one of the machines here?
> 
> 
> I don't remember if any of those were SMP, but this was on phk's dual
> u60.  I applied the patch in PR 66314, and while I haven't had a
> repeat of the ipi panic, it did fall over with one of the other panics
> I regularly see on this machine.  Also, jhb seemed to think there was
> an underlying MI problem, and this patch would only delay the
> occurence of the panic.
> 
> Kris

The problem does not arise in the following cases:
kernel build without SMP option;
kernel running on uniprocessor machine (with or without SMP option).

The problem is somehow related to Creator 3D.

To reproduce problem I use any program, that generate large output.
For example: "ls -laR /"

Andrew