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

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Message-ID: <33eb3085-552b-6a9a-66d4-4b2397b310c8@oracle.com>
Date:   Sun, 8 Jan 2023 16:50:00 -0800
From:   dai.ngo@...cle.com
To:     Mike Galbraith <efault@....de>,
        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

Hi Mike,

Could you give the v2 patch a try? I will send you the location
to upload the core, if it happens, in a private email.

Thanks,
-Dai

On 12/23/22 5:05 AM, Mike Galbraith wrote:
> 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
>
View attachment "0001-PATCH-v2-NFSD-fix-WARN_ON_ONCE-in-__queue_delayed_wo.patch" of type "text/plain" (7325 bytes)