[Bug 245649] [zfs] [panic] panic booting after removing zil

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245649

            Bug ID: 245649
           Summary: [zfs] [panic] panic booting after removing zil
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: will at worrbase.com

Created attachment 213430
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=213430&action=edit
snapshot of kernel panic

Hey,

I removed a ZIL device from my ZFS pool. I ended up fully removing the device
from my server, as well as regenerating /boot/zfs/zpool.cache after removing
the device.

On boot, I now get a kernel panic when trying to boot. Unusually, the server
*immediately* reboots despite setting kern.panic_reboot_wait_time=1 in
loader.conf. I managed to catch a blurry shot of the panic, attached.

To save you from deciphering that, the panic is a failing assert right here:
https://svnweb.freebsd.org/base/release/12.1.0/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c?revision=354337&view=markup#l5222

I was able to boot into mfsbsd and have been able to import and mount the pool
with no problem, and have removed and regenerated zpool.cache a few times. I'm
not sure what else to do, and this seems like a bug.

Thanks!

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