This exact kernel panic happened to us again on newer linux version
5.4.0-39-generic
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https://bugs.launchpad.net/bugs/1885265
Title:
NFSd4 crashes system in unhash_delegation_locked
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-signed-hwe (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1885265
** Description changed:
After running quite busy NFS4 server with ZFS as backend filesystem for
some time we get system crash with weekly regularity. Clients are
mounted with delegation propagation enabled and client mount options are
as follows:
type nfs4