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SubjectRe: Kernel 3.4.X NFS server regression
Date
Cc: linux-nfs@vger.kernel.org + bfields and changing title to label it
as a server regression since that is what the trace appears to imply.

On Sun, 2012-06-10 at 12:56 +0200, Joerg Platte wrote:
> All 3.4 kernels I tried so far (3.4, 3.4.1 and 3.4.2) suffer from the
> same NFS related problem:
>
> Jun 10 09:23:36 coco kernel: INFO: task kworker/u:1:8 blocked for more
> than 120 seconds.
> Jun 10 09:23:36 coco kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Jun 10 09:23:36 coco kernel: kworker/u:1 D 002ba28c 0 8
> 2 0x00000000
> Jun 10 09:23:36 coco kernel: df465ec0 00000046 00000005 002ba28c
> 00000000 0000000a 00000282 df465e70
> Jun 10 09:23:36 coco kernel: df465ec0 df44d2b0 ffff6b60 df465e84
> df44d2b0 e33fa6b3 00000282 de764ae0
> Jun 10 09:23:36 coco kernel: ffffffff d78bcfb8 df465e8c c012e0f6
> df465ea4 c013610c 00000000 d78bcf80
> Jun 10 09:23:36 coco kernel: Call Trace:
> Jun 10 09:23:36 coco kernel: [<c012e0f6>] ? add_timer+0x11/0x17
> Jun 10 09:23:36 coco kernel: [<c013610c>] ? queue_delayed_work_on+0x74/0xf0
> Jun 10 09:23:36 coco kernel: [<c0136ba4>] ? queue_delayed_work+0x1b/0x28
> Jun 10 09:23:36 coco kernel: [<c0350f5b>] schedule+0x1d/0x4c
> Jun 10 09:23:36 coco kernel: [<e0cda5f1>] cld_pipe_upcall+0x4e/0x75 [nfsd]
> Jun 10 09:23:36 coco kernel: [<e0cda678>]
> nfsd4_cld_grace_done+0x60/0x99 [nfsd]
> Jun 10 09:23:36 coco kernel: [<e0cd9cb5>]
> nfsd4_record_grace_done+0x10/0x12 [nfsd]
> Jun 10 09:23:36 coco kernel: [<e0cd6696>] laundromat_main+0x291/0x2d8
> [nfsd]
> Jun 10 09:23:36 coco kernel: [<c0136d2f>] process_one_work+0xff/0x325
> Jun 10 09:23:36 coco kernel: [<c0134bec>] ? start_worker+0x20/0x23
> Jun 10 09:23:36 coco kernel: [<e0cd6405>] ?
> nfsd4_process_open1+0x32b/0x32b [nfsd]
> Jun 10 09:23:36 coco kernel: [<c013727a>] worker_thread+0xf4/0x39a
> Jun 10 09:23:36 coco kernel: [<c0137186>] ? rescuer_thread+0x231/0x231
> Jun 10 09:23:36 coco kernel: [<c013a556>] kthread+0x6c/0x6e
> Jun 10 09:23:36 coco kernel: [<c013a4ea>] ? kthreadd+0xe8/0xe8
> Jun 10 09:23:36 coco kernel: [<c035263e>] kernel_thread_helper+0x6/0xd
>
> A kworker task is stuck in D state and nfs mounts from other clients do
> not work at all. This happens only on one machine, another one with the
> same kernel (same self compiled Debian package) works. All previous 3.3
> kernels work as well.
>
> Since this machine is remote it is not that easy to bisect to find the
> bad commit. Are there any other things I can try?
>
> regards,
> Joerg
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--
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@netapp.com
www.netapp.com

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