[Bug 254513] virtio_random: random_harvestq spinning on a CPU with Q35 virtio random device

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 12 Jan 2022 20:10:40 UTC

--- Comment #34 from Jamie Landeg-Jones <jamie@catflap.org> ---
(In reply to Dennis Noordsij from comment #32)

> Regarding ready installation images; I usually boot the rescue mode and install manually by creating partitions and untarring the base system, so perhaps Hetzner/Vultr provide installation media where virtio_random is already pre-blacklisted).

The vultr install does indeed disable virtio-random, but that wasn't the only
issue: I created my own ISO without virtio-random , and whilst it stopped the
boot hang, it still caused problems (hanging on reboot being one)

I talked with the vultr guy and he confirmed - he had to disable virtio-random
AND change the KVM profile to boot :

> "2021-07-14 16:37:43
> We've found that v12 and older of FreeBSD do not actually support q35 - so when any version of FreeBSD is selected from our control panel we default that back to i440fx. We do have a few customers using the iso-over-image trick, and we didn't want to break them if they're just selecting the default version (13) and then trying to install 12 over it.

> We have not done extensive testing of FreeBSD on q35 yet - it seems like support for this is very new, so I wouldn't be surprised if there were still issues causing it to hang at reboot.

>Brian, Vultr.com Support

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