[Bug 270546] nullfs prevents zfs from freeing space

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 30 Mar 2023 16:19:17 UTC

            Bug ID: 270546
           Summary: nullfs  prevents zfs from freeing space
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: r4@sovserv.ru

how to reproduce:

1) mount zfs filesystem in 2 separate places with nullfs, ex /mount1 and
2) create file in /mount1
3) ls /mount2
4) rm /mount1/file
5) space not freed by zfs. 

only umount of /mount2 frees space

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