Re: Hang ast / pipelk / piperd

Reply: Floyd, Paul: "Re: Hang ast / pipelk / piperd"
In reply to: Paul Floyd : "Re: Hang ast / pipelk / piperd"
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From: Mark Johnston <markj_at_freebsd.org>
Date: Mon, 06 Jun 2022 18:17:26 UTC

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.