ZFS shouldn't panic.  It should report errors in the pool then a scrub should be able to repair it.

Rebuilding a pool is not possible for one of the systems that I manage which is is 2.2PB and 232 hard drives as the funds required would huge.  Scrubs take several days to complete.

Stefan, you should probably open a upstream bug with OpenZFS:
https://github.com/openzfs/zfs

I searched the issues and I didn't see this problem reported. 

ZFS has no fsck since it's supposed be always in a consistent state and therefore does not need one.

Guess I will need to be very careful upgrading to 2.3.2.

    Chris

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