kern/55981: nouveau panic on boot (one-off)

[prlw1%cam.ac.uk@localhost]

>Number:         55981
>Category:       kern
>Synopsis:       nouveau panic on boot (one-off)
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 08 11:50:01 +0000 2021
>Originator:     Patrick Welche
>Release:        NetBSD-9.99.80/amd64
>Organization:
>Environment:
8 Feb 2021 source
>Description:
Panic on boot, but after automatic reboot OK => have core file
(which gdb isn't happy with, but crash is)


uvm_fault(0xffffffff810b7180, 0xffffde836dd5c000, 2) -> e
fatal page fault in supervisor mode
trap type 6 code 0x2 rip 0xffffffff806502ed cs 0x8 rflags 0x10202 
6dd5cffc ilevel 0x8 rsp 0xffffde825cfd1b00
curlwp 0xffffdaa491527180 pid 0.17 lowest kstack 0xffffde825cfcd2c0 
panic: trap
cpu3: Begin traceback...
vpanic() at netbsd:vpanic+0x156
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0xad
evo_sync() at netbsd:evo_sync+0x32
nv50_crtc_disable() at netbsd:nv50_crtc_disable+0x14
__drm_helper_disable_unused_functions() at netbsd:__drm_helper_dinctions+0x88 
drm_crtc_helper_set_config() at netbsd:drm_crtc_helper_set_config+0x58a 
nouveau_crtc_set_config() at netbsd:nouveau_crtc_set_config+0x27
drm_mode_set_config_internal() at netbsd:drm_mode_set_config_internal+0x6a 
drm_fb_helper_restore_fbdev_mode_unlocked() at netbsd:drm_fb_helpv_mode_unlocked+0xd2 
drm_fb_helper_hotplug_event() at netbsd:drm_fb_helper_hotplug_event+0x136 
drm_helper_hpd_irq_event() at netbsd:drm_helper_hpd_irq_event+0xde 
nouveau_connector_hotplug() at netbsd:nouveau_connector_hotplug+0x7a 
nvif_notify_work() at netbsd:nvif_notify_work+0x2a
linux_workqueue_thread() at netbsd:linux_workqueue_thread+0x172
cpu3: End traceback...

>How-To-Repeat:

>Fix: