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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