Kernel panic in laundromat_main on 5.3.0-46-generic (Ubuntu HWE)

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Hi all,

Today we've seen a kernel panic that looks like related to delegations
and laundromat

...
[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
....

In the link below you'll find what has been captured from the console.

https://pastebin.com/raw/CdpMfUAK

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.

Best regards,
Doma



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