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

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Date:   Fri, 23 Dec 2022 14:05:29 +0100
From:   Mike Galbraith <efault@....de>
To:     dai.ngo@...cle.com, Chuck Lever III <chuck.lever@...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

On Fri, 2022-12-23 at 04:02 -0800, dai.ngo@...cle.com wrote:
> Hi Mike,
>
> I think the problem is the nfsd4_state_shrinker_worker is being
> scheduled to run multiple times. This trigger the WARN_ON_ONCE
> in __queue_delayed_work.
>
> Could you try the attached patch to see if it fixes this problem.
> I tried to reproduce it on my test VMs but no success so I can't
> verify the patch.
> >

That was a nogo.

bart:/root # grep WARNING: netconsole.log
[ 1030.364594] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1655 __queue_delayed_work+0x6a/0x90
[ 1030.364970] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1657 __queue_delayed_work+0x5a/0x90
[ 1030.365315] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.365666] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.365992] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.366333] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.366669] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.366995] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.367317] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.367636] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0
[ 1030.367962] WARNING: CPU: 4 PID: 79 at kernel/workqueue.c:1500 __queue_work+0x33b/0x3d0