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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