Hello, a few weeks ago I have installed a secondary SSD for redundancy in my cache (zfs pool).
My Array is in an xfs pool.
all my SSDs and HDDs are pretty new (just a few months old). but sadly sometimes my Unraid keeps crashing, and all of sudden I get the following error in the console while booting up:

kernel:PANIC: zfs: adding existent segment to range tree (offset=2de0a64f000 size=1000)

I have googled around a bit and tried out the following ypool commands, but these arent very helpful either.
 

unraid@tower:~# zpool status -x
  pool: cache
 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
config:

        NAME           STATE     READ WRITE CKSUM
        cache          ONLINE       0     0     0
          mirror-0     ONLINE       0     0     0
            sdb1       ONLINE       0     0     0
            nvme0n1p1  ONLINE       0     0     0

errors: 1 data errors, use '-v' for a list

unraid@tower:~# zpool status -x -v
  pool: cache
 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
config:

        NAME           STATE     READ WRITE CKSUM
        cache          ONLINE       0     0     0
          mirror-0     ONLINE       0     0     0
            sdb1       ONLINE       0     0     0
            nvme0n1p1  ONLINE       0     0     0

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

        <0x1207>:<0x84>

also no CRC count errors in either of the SSDs

is there anything I can do?

tower-diagnostics-20231111-1549.zip

I would start by running memtest, then backup and re-format the pool, since there's likely metadata corruption.