Thanks. The weird thing is that SMART information indicates nothing to believe the HDD is going to fail.Looks like you have a whole bunch of disk issues. And that's causing the panics. Nothing to do with Poudriere, that's just the trigger. Focus on the bad disks.
The new HDD is installed. I'm running poudriere with 8 parallel jobs for eleven hours without problems.
I still don't understand why SMART gave me no clue, but data has no price anyway.