Created attachment 209547 [details]
screenshot of the kernel panic
I've attached a screenshot of the kernel panic.
Currently consistently reproducible via mounting the FS in question.
FreeBSD vixen42.vulpes.vvelox.net 12.1-STABLE FreeBSD 12.1-STABLE r354803 vixen42 amd64
Only change from the default is the inclusion of ALTQ.
On a similar note, came across this. Not sure how relevant it... https://github.com/zfsonlinux/zfs/issues/8910
Post a long SMART self test finishing, going to try setting vfs.zfs.zil_replay_disable to 1 and seeing if I can mount it that way.
Just a note that in my opinion the ZoL issue is the same problem.
(In reply to Andriy Gapon from comment #1)
Yup. Definitely looks to be the same issue. Post SMART self test finishing, I set sysctl vfs.zfs.zil_replay_disable=1 and it mounted with out issue then.