linux-kernel - Re: regression: nfs mount (even idle) eventually hangs server

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Date:   Thu, 22 Dec 2022 14:30:13 +0100
From:   Mike Galbraith <efault@....de>
To:     Chuck Lever III <chuck.lever@...cle.com>,
        Dai Ngo <dai.ngo@...cle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: regression: nfs mount (even idle) eventually hangs server

Quoting previous mail for context.

On Thu, 2022-12-22 at 05:14 +0100, Mike Galbraith wrote:
> On Thu, 2022-12-22 at 04:42 +0100, Mike Galbraith wrote:
> > On Wed, 2022-12-21 at 10:56 +0100, Mike Galbraith wrote:
> > > > 6.1 didn't reproduce either, so it would appear to be a merge window bug.
> >
> > Ah, not true, turning evolution loose in nfs mounted home and letting
> > it refresh mailboxes while desktop box was kept busy jammed up 6.1.0 in
> > fairly short order.
>
> Well crap.  That was _not_ virgin 6.1.0 after all, it was 6.1.0 with...
>
> 44df6f439a17 NFSD: add delegation reaper to react to low memory condition
> 3959066b697b NFSD: add support for sending CB_RECALL_ANY
> a1049eb47f20 NFSD: refactoring courtesy_client_reaper to a generic low memory shrinker
>
> ...applied from poking about yesterday.  I had given up on those as
> culprit, and intended to pop them off and rebuild, but they were in
> fact in the booted kernel.  Oh well, booboo could have a bright side.

I let my desktop box play server/space-heater for a long test session
of 6.1 with and without the above series: with, box bricked 3 times in
~5 hours, without, 0 bricks in ~6 hours.  Box says woof -> duck ;-)

Given the similarity you mentioned, I wonder if my bug is perhaps your
sneaky bug rendered somewhat less sneaky by that series? One can hope.

	-Mike