The fix for this bug was merged to the mainline kernel:
  commit 8301c719a2bd ("fix null pointer dereference at 
nilfs_segctor_do_construct()")
This commit was sent to the stable mailing list as well.  (for v5.4+)

It also can be fixed by reverting the change corresponding to commit 
c3aab9a0bd91
("mm/filemap.c: don't initiate writeback if mapping has no dirty pages") that 
causes the issue.

If an older kernel back ported the latter commit without the commit 
8301c719a2bd, this issue can be reproduced.
I guess that is what's happening here.

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https://bugs.launchpad.net/bugs/1868325

Title:
  NILFS2 kernal crashes from normal use

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