What should be next steps here?  This is repeatable.  The host is stable
(it can makeworld -j32 in about 25 minutes ... so it's hardware seems
good).  Is this an AMD bug?  Is it bad to use ZFS ZVols?

 ZVols are fine. Is the guest panic a spinlock timeout ?

I believe this is a bug in bhyve/SVM. It appears somewhat related to processor speed (I can't repro on a 2.3GHz 8 CPU Opteron 6320, but can hit it after 15 mins or so on a Ryzen 1700, with/without SMT).

Anish and I are currently chasing this and have repros. An experiment you could try is to run with the vCPUs pinned i.e. for a 4 vCPU guest, add the options "-p 0:1 -p 1:2 -p 2:3 -p 3:4".


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