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Date: Mon, 17 Feb 2020 01:24:41 +0000 (UTC)
From: Greg V <greg@unrelenting.technology>
To: Yuri Pankov <yuripv@yuripv.me>
Cc: freebsd-x11 <freebsd-x11@freebsd.org>
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Subject: Re: does vmwgfx work at all?
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Feb 17, 2020 12:36:17 AM Yuri Pankov :

> (resending as apparently the message didn't get through)
>
> I am trying to use the vmwgfx module on VMware Workstation 15.5.1 VM,
> running 13.0-CURRENT, and it seems that none of drm-current-kmod and
> drm-devel-kmod's modules work -- former simply reboots the system
> (panic, unable to save dump), latter panics as well (below).
>
> https://wiki.freebsd.org/Graphics lists vmwgfx as "experimental", but
> OTOH the wording there seems to suggest it should at least load.
>
> Any hints?

IIRC there was a concurrency bug and you need to run a single-core VM. The trace below hints at locking too:

> thread_lock_validate() at thread_lock_validate+0x4/frame 0xfffffe00a2b47a30