[Bug 265517] Unattended install FreeBSD 13.1 ZFS+UEFI fails: "cannot unmount '/mnt': pool or dataset busy"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265517

--- Comment #11 from Stéphane Rochoy <stephane.rochoy@stormshield.eu> ---
Created attachment 236014
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=236014&action=edit
bsdinstall/script returning Bad file descriptor

Thanks Mark! Unfortunately for me, the following call to `f_dprintf` seems to
break:

+ bsdinstall entropy
+ [ da0 ]
+ bsdinstall umount
+ zfs umount -a
+ zpool export zroot
+ set -x
+ date
+ f_dprintf 'Installation Completed at %s' 'Fri Jun 10 00:02:16 UTC 2022'
+ [ 1 ]
+ local 'fmt=Installation Completed at %s'
+ shift
+ printf 'DEBUG: Installation Completed at %s\n' 'Fri Jun 10 00:02:16 UTC 2022'
/usr/libexec/bsdinstall/script: 3: Bad file descriptor
+ error
+ local file
+ f_getvar 'debugFile#+' file
+ local '__var_to_get=debugFile#+' '__var_to_set=file'
+ [ file ]
+ eval [ '"${debugFile#++set}"' ]
+ [ '' ]

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