Panic upgrading from 12.0-RELEASE-p8 to p9

[worr]

When trying to upgrade from p8 to p9, I get a kernel panic immediately on next boot. Luckily, after getting burned by FreeBSD upgrades a few times now, I usually snapshot before upgrade, so it's easy to revert. It's worthwhile to note that I am running ZFS on root, raid-z10 with 8 drives and a separate log/cache device.

zpool status:

  pool: tank
state: ONLINE
status: One or more devices are configured to use a non-native block size.
    Expect reduced performance.
action: Replace affected devices with devices that support the
    configured block size, or migrate data to a properly configured
    pool.
  scan: scrub repaired 0 in 5h55m with 0 errors on Sat Aug 10 09:01:00 2019
config:

    NAME                                            STATE     READ WRITE CKSUM
    tank                                            ONLINE       0     0     0
      mirror-0                                      ONLINE       0     0     0
        diskid/DISK-WD-WCC4E2VZV3E1p3               ONLINE       0     0     0
        gptid/c74650ad-c61c-11e3-8b42-d0509909d8a6  ONLINE       0     0     0
      mirror-1                                      ONLINE       0     0     0
        diskid/DISK-WD-WCC4E0478835p3               ONLINE       0     0     0
        diskid/DISK-WD-WCC4E1262418p3               ONLINE       0     0     0
      mirror-2                                      ONLINE       0     0     0
        diskid/DISK-WD-WCC4E1965981p3               ONLINE       0     0     0  block size: 512B configured, 4096B native
        diskid/DISK-WD-WCC4EHZ9RP2Hp3               ONLINE       0     0     0  block size: 512B configured, 4096B native
      mirror-4                                      ONLINE       0     0     0
        diskid/DISK-WD-WCC4E2050088p3               ONLINE       0     0     0
        diskid/DISK-WD-WCC4EKKD0A8Pp3               ONLINE       0     0     0
    logs
      gpt/log                                       ONLINE       0     0     0
    cache
      ada0p2                                        ONLINE       0     0     0

errors: No known data errors

To upgrade, I'm just doing the usual:

freebsd-update fetch
freebsd-update install
reboot

I've attached an image of the panic. I've reverted the snapshot, so I'm back at p8, can boot and can grab any more requested information.

Even after the panic, I can boot up in mfsbsd, import the pool and mount everything just fine.

Thanks a ton!

 

[_martin]

I'd recommend opening a PR for this.
It seems zio_read() failed to read the data. Text you see is a GP (general protection) exception message.

You might be even able to boot back to older BE snapshot by interrupting early loader (indicated by rolling | / - ) and specifying custom boot path. I mentioned the process also here. This way you don't need to boot anything other medium.