kern/56286: current kernel crashes trying to load radeon firmware

[martin%NetBSD.org@localhost]

>Number:         56286
>Category:       kern
>Synopsis:       current kernel crashes trying to load radeon firmware
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 30 10:40:00 +0000 2021
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.86
>Organization:
Thet NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 9.99.82 NetBSD 9.99.82 (NIGHT-OWL) #730: Mon May 10 12:04:13 CEST 2021 martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL amd64
(this is an older kernel that works)

Architecture: x86_64
Machine: amd64
>Description:

Trying to boot a current kernel on this machine crashes in 
vn_open+0x33a
firmware_open
..
radeon drm code trying to load r600 firmware
..

ret_domove is NULL here:

0xffffffff80a8b504 is in vn_open (../../../../kern/vfs_vnops.c:358).
353                     *ret_domove = true;
354                     *ret_fd = l->l_dupfd;
355                     error = 0;
356             } else if (error == 0) {
357                     *ret_vp = vp;
358                     *ret_domove = false;


>How-To-Repeat:

Try to boot -current.

>Fix:
n/a