[Bug 243063] [bhyve] nvme timeouts

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243063

            Bug ID: 243063
           Summary: [bhyve] nvme timeouts
           Product: Base System
           Version: 12.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: iron.udjin at gmail.com

Hello,

OS: 12.1-STABLE r356314

I've got two different servers with with NVME disks. First one has VM with
Centos 7, second has VM with debian 10. Both Vms use disk0_type="nvme". From
time to time disk subsystem in VMs freezes and I see in dmesg:

Centos 7:
Dec 31 13:26:28 localhost kernel: nvme nvme0: I/O 676 QID 4 timeout, aborting
Dec 31 13:26:58 localhost kernel: nvme nvme0: I/O 676 QID 4 timeout, reset
controller

Debian 10:
Jan  3 19:43:46 localhost kernel: [  472.062677] nvme nvme0: I/O 363 QID 1
timeout, completion polled
Jan  3 20:24:38 localhost kernel: [ 2925.514461] nvme nvme0: I/O 545 QID 3
timeout, completion polled
Jan  3 20:28:40 localhost kernel: [ 3167.351351] nvme nvme0: I/O 1012 QID 2
timeout, completion polled

...and nothing in logs or dmesg of host systems.

Why does it happen and how can be fixed?

Thank you!

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