[Bug 273772] zpool nested in ZVOL becomes inaccessible when zfsd(8) is running on the host

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273772

--- Comment #6 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
(In reply to Alan Somers from comment #5)

# fstat -p `pgrep zfsd`
USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
root     zfsd        8038 text /        279328 -r-xr-xr-x  105480  r
root     zfsd        8038   wd /             4 drwxr-xr-x      30  r
root     zfsd        8038 root /             4 drwxr-xr-x      30  r
root     zfsd        8038    0 /dev         20 crw-rw-rw-    null rw
root     zfsd        8038    1 /dev         20 crw-rw-rw-    null rw
root     zfsd        8038    2 /dev         20 crw-rw-rw-    null rw
root     zfsd        8038    3* pipe fffffe0074847c70 <-> fffffe0074847dc8     
0 rw
root     zfsd        8038    4* pipe fffffe0074847dc8 <-> fffffe0074847c70     
0 rw
root     zfsd        8038    5 /dev        116 crw-rw-rw-     zfs rw
root     zfsd        8038    6 /dev        116 crw-rw-rw-     zfs rw
root     zfsd        8038    7* local dgram fffff80891b10400 <->
fffff808916ef200

I tried to access nested zpool from the host after setting
vfs.zfs.vol.recursive=1 to workaround the issue old way, by performing snapshot
cleanup, but it seems to be impossible after switching to stable/14. So the
whole problem is probably geneal ZFS issue, and zfsd(8) only triggers it.

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