[Bug 225663] FreeBSD 11.1-STABLE on root zfs panics on boot

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225663

--- Comment #2 from dog at virtual.org.ua ---
Unfortunately I cannot catch the moment of panic (or maybe it's not even a
panic, but some problem with zfs that causes my root zfs pool to collapse
during the root mount).
My system starts booting, loads kernel and all kernel modules ( I tried to
remove all of them except of zfs from loader.conf, but it didn't help) and then
at the moment of mounting root zfs pool it momentarily shows some lines of
error messages and PC immediately reboots. As far as my root zfs pool takes the
whole disk space I have no space for non-zfs kernel dumps and therefor there's
no any dumps saved. Nothing's written in logs too, because (as I understand) it
happens before system can open any file to write. The reboot starts too fast
and I cannot even make a photo of the screen to recognize what errors exactly
happen. I tried to update the system to the most recent version from Mar 08
2018, but the problem still exists.
Is there any way to make the system not reboot immediately after root zfs pool
mounting error, but freeze and just show me the error until I press a key or
something like that? Otherwise I'm not able to pick any additional information.

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