[zfs] need help with a bug (PR 156781)

[Andriy Gapon]

I can observer a similar problem where I can not list .zfs directory under
filesystems which do not have any snapshots.  I can not tell if the problem
happens when all snapshots are removed or if it only happens if a filesystem
doesn't have any snapshots when ZFS is initialized (a system is booted).

I am not sure what's going on but a quick check with DTrace points to negative
caching as a culprit.  I see that cache_lookup() returns ENOENT for .zfs.


-- 
Andriy Gapon