Date: Thu, 16 Jun 2022 11:03:47 -0400 From: Mark Johnston <markj@freebsd.org> To: "Floyd, Paul" <paulf2718@gmail.com> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Hang ast / pipelk / piperd Message-ID: <YqtGU30t9YDY04SS@nuc> In-Reply-To: <9e5f9da7-e640-857d-5103-f5e61f69a758@gmail.com> References: <84015bf9-8504-1c3c-0ba5-58d0d7824843@gmail.com> <dca6a5b4-6f0c-98c0-2f2d-6e5da7405af4@gmail.com> <YpTRj7jVE0jfbxPO@nuc> <b598c89e-f11a-eed1-3d74-c3ef37bc400a@gmail.com> <Ypd0ziZKcZ2pgm0P@nuc> <bf595064-e03c-e69d-9d93-3f7de52360c0@gmail.com> <Yp5Etji1nw6CB9gb@nuc> <9e5f9da7-e640-857d-5103-f5e61f69a758@gmail.com>
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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.
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