Re: kern/49305: deadlocks on sparc64 SMP

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Sun, 9 Nov 2014 17:16:01 +0100
Martin Husemann <martin%duskware.de@localhost> wrote:

> On Sun, Nov 09, 2014 at 03:13:21PM +0000, Mindaugas Rasiukevicius wrote:
> > Unlikely to be pcq(9).  Most likely this is related to software interrupts
> > or IPIs on sparc64, see softint_schedule_cpu(9).  Unfortunately, I do not
> > have time to look into sparc64 MD code right now.
> 
> Possible, but why does the "always use the other cpu for softint processing"
> version not trigger it?

Might be a fluke but to me it looks like the problem happens
( sometimes ) when we schedule two software interrupts on different
CPUs in quick succession.

have fun
Michael