panic in evo_wait

[Thomas Klausner <wiz%NetBSD.org@localhost>]

Hi!

Yesterday I had a panic on 9.99.98/amd64 from June 22 while playing a
couple of videos using mpv. Hand-transcribed from the console

[184197.xxx] nouveau0: error: bus: MMIO read of 00000000 FAULT at 409800 [TIMEOUT ]
[184199.xxx] nouveau0: warn: timeout
[184199.xxx] nouveau0: error: gr: init failed, -16
[184201.xxx] nouveau0: warn: timeout
[184203.xxx] nouveau0: warn: timeout
[184205.xxx] nouveau0: warn: timeout
[184207.xxx] nouveau0: warn: timeout
[184209.xxx] nouveau0: warn: timeout
[184211.xxx] nouveau0: warn: timeout
[184213.xxx] nouveau0: warn: timeout
[184215.xxx] nouveau0: warn: timeout
[184218.xxx] nouveau0: warn: timeout
[184218.xxx] warning: /usr/src/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/engine/disp/nouveau_nvkm_engine_disp_headgf119.c:83: 1
[184218.xxx] warning: /usr/src/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/engine/disp/nouveau_nvkm_engine_disp_headgf119.c:83: 1
[184218.xxx] warning: /usr/src/sys/external/bsd/drm2/dist/drm/nouveau/nvkm/engine/disp/nouveau_nvkm_engine_disp_headgf119.c:83: 1
[184218.xxx] uvm_fault(0xffffffff8191ba80, 0xffffb649e46a3000, 2) -> e
[184218.xxx] fatal page fault in supervisor mode
[184218.xxx] trap type 6 code 0x2 ...
[184218.xxx] curlpw 0xffffa8d4e6f36500 pid 27414.3207 lowest kstrack 0xffffb589296452c0
kernel: page fault trap, code=0
Stopped in pid 27414.3207 (mpv) at netbsd:evo_wait+0x7b: movl $0x20000
000,0(%rdx,%rax,1)
evo_wait() at netbsd:evo_wait+0x7b
base507c_ntfy_set()
nv50_wndw_flush_set()
nv50_disp_atomic_commit_tail()
nv50_disp_atomic_commit()
drm_atomic_helper_set_config()
drm_mode_setcrtc()
drm_ioctl()
drm_ioctl_shim()
sys_ioctl()
syscall()
--- syscall (number 54) ---


Does this ring a bell with anyone?

Should I file a PR?
 Thomas