I've hit this bug on a non-encrypted pool. FS scrub also reported no
errors for me. I'm currently on Kernel 5.11.0-37-generic / zfs libs
2.0.2-1ubuntu5.2 (Hirsute), though the corruption may have occurred on a
previous kernel / library. The directory which is triggering the hang
for me was created Jun 7 of this year so it appears to be recent
problem. I've identified the corrupted directory and moved it out of the
way (fortunately is contains nothing important), but I'm unable to
delete it from the filesystem. Any attempts to read or delete the
directory hangs. Setting zfs_recovery=1 does not help. The only way I
can recover from hang is to reboot. I'd like to know if there is any way
to get rid of the corrupted directory other than having to create a new
filesystem and copy over all the other files / dirs except the problem
one?

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https://bugs.launchpad.net/bugs/1931660

Title:
  PANIC at zfs_znode.c:339:zfs_znode_sa_init()

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