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Subject: Re: Kernel panic in laundromat_main on 5.3.0-46-generic (Ubuntu HWE)
From:   Chuck Lever <chuck.lever@oracle.com>
In-Reply-To: <CAL9i7GHMbU9_5i6r-c=kmv+q0LPTKAX8WX0bNxpwzeXT=UjN-g@mail.gmail.com>
Date:   Tue, 18 Aug 2020 10:08:12 -0400
Cc:     Linux NFS Mailing List <linux-nfs@vger.kernel.org>
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 <CAL9i7GHMbU9_5i6r-c=kmv+q0LPTKAX8WX0bNxpwzeXT=UjN-g@mail.gmail.com>
To:     sea you <seayou@gmail.com>
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Hi-

> On Aug 12, 2020, at 5:24 AM, sea you <seayou@gmail.com> wrote:
>=20
> After upgrading the kernel to 5.4.0-39-generic, the very same happened =
again.
> You could find more information here on LaunchPad
> =
https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe/+bug/1885265
>=20
> Anyone else experienced this? This definitely looks like a bug to me
> at this point.

Thanks for the bug report.

This appears to be a distributor's kernel and ZFS (which is an out-
of-tree filesystem) is the backend.

The distributor will have to drill down on this issue with a recent
upstream kernel and a native filesystem to demonstrate we have an
upstream bug.


> On Thu, May 14, 2020 at 12:26 PM sea you <seayou@gmail.com> wrote:
>>=20
>> Hi all,
>>=20
>> Today we've seen a kernel panic that looks like related to =
delegations
>> and laundromat
>>=20
>> ...
>> [1388051.959652] Call Trace:
>> [1388051.959984]  unhash_delegation_locked+0x39/0xa0 [nfsd]
>> [1388051.960631]  laundromat_main+0x235/0x5a0 [nfsd]
>> [1388051.961234]  process_one_work+0x1fd/0x3f0
>> [1388051.961803]  worker_thread+0x34/0x410
>> [1388051.962281]  kthread+0x121/0x140
>> [1388051.962698]  ? process_one_work+0x3f0/0x3f0
>> [1388051.963210]  ? kthread_park+0xb0/0xb0
>> [1388051.963690]  ret_from_fork+0x22/0x40
>> ....
>>=20
>> In the link below you'll find what has been captured from the =
console.
>>=20
>> https://pastebin.com/raw/CdpMfUAK
>>=20
>> I couldn't really find any reference to this in the mailing list
>> history so I assume we might have hit a bug that is unknown so far.
>>=20
>> Best regards,
>> Doma

--
Chuck Lever