Re: Hang ast / pipelk / piperd

From: Mark Johnston <markj_at_freebsd.org>
Date: Thu, 16 Jun 2022 15:03:47 UTC 
On Thu, Jun 16, 2022 at 02:16:38PM +0200, Floyd, Paul wrote:
> 
> 
> On 2022-06-06 20:17, Mark Johnston wrote:
> > On Wed, Jun 01, 2022 at 11:27:52PM +0200, Paul Floyd wrote:
> >> On 6/1/22 14:16, Mark Johnston wrote:
> >>> The fact that the problem apparently only occurs with 1 CPU suggests a
> >>> scheduler bug, indeed.
> >>
> >> Here is the fresh procstat output
> > 
> > I was able to reproduce the problem locally and narrow down the bug
> > somewhat.  If you can test a kernel patch, please try this one:
> > https://reviews.freebsd.org/D35415 .  I verified that it solves the hang
> > in my test setup, but I didn't go any further than that yet.
> 
> Hi Mark
> 
> What would be best for testing? The latest 14.0-CURRENT with a build 
> from git master?

Yes, that would work - I've since committed the patch.  It'll be merged
to 13-STABLE within a few weeks.