Following a panic (271945): zpool status reports 1 data error but identifies no file

From: Graham Perrin <grahamperrin_at_freebsd.org>
Date: Sun, 11 Jun 2023 12:02:52 UTC
See below, should I begin scrubbing? Or (before I begin) might zdb 
reveal something useful?

The supposed error was observable after 
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271945>

/271945 – panic: deadlres_td_sleep_q: possible deadlock detected for 
0xfffffe0133324ac0 (stat), blocked for 1801328 ticks//
/


root@mowa219-gjp4-8570p-freebsd:~ # zpool status -x august
  pool: august
state: ONLINE
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
   see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-8A
  scan: scrub repaired 0B in 6 days 05:45:16 with 0 errors on Tue May  9 
02:56:41 2023
config:

        NAME                 STATE     READ WRITE CKSUM
        august               ONLINE       0     0     0
          ada0p3.eli         ONLINE       0     0     0
        cache
          gpt/cache2-august  ONLINE       0     0     0
          gpt/cache-august   ONLINE       0     0     0
          gpt/cache3-august  ONLINE       0     0     0

errors: 1 data errors, use '-v' for a list
root@mowa219-gjp4-8570p-freebsd:~ # zpool status -v august
  pool: august
state: ONLINE
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
   see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-8A
  scan: scrub repaired 0B in 6 days 05:45:16 with 0 errors on Tue May  9 
02:56:41 2023
config:

        NAME                 STATE     READ WRITE CKSUM
        august               ONLINE       0     0     0
          ada0p3.eli         ONLINE       0     0     0
        cache
          gpt/cache2-august  ONLINE       0     0     0
          gpt/cache-august   ONLINE       0     0     0
          gpt/cache3-august  ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:

root@mowa219-gjp4-8570p-freebsd:~ #