lots of bugreports about a kernel-backtrace starting with amdgpu_dm_backlight_update_status

[Hans de Goede]

Hi All,

Fedora has a (opt-in) system to automatically collect backtraces from software
crashing on users systems.

This includes collecting kernel backtraces (including once triggered by
WARN macros) while looking a the top 10 of the most reported backtrace during the
last 2 weeks report from ABRT: https://retrace.fedoraproject.org/faf/problems/

I noticed the following backtrace:
https://retrace.fedoraproject.org/faf/problems/13904/

which has been reported 160000 times by Fedora users who have opted-in during the
last 14 days.

The ABRT symbol resolution points to amdgpu_dm_backlight_update_status:

1 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
2 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
3 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
4 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
5 	
? amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
6 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
7 	
amdgpu_dm_backlight_update_status
	amdgpu 		0xb4
8 	
drm_sched_job_timedout
	gpu_sched 	drivers/gpu/drm/scheduler/sched_main.c 	289


But the backtrace from dmesg points to something else:

RIP: 0010:dcn10_get_dig_frontend+0x76/0xb0 [amdgpu]
Code: 39 44 89 c0 48 83 c4 08 c3 41 b8 05 00 00 00 83 f8 20 74 ed 41 b8 06 00 00 00 83 f8 40 74 e2 41 b8 04 00 00 00 83 f8 10 74 d7 <0f> 0b 41 b8 ff ff ff ff 48 83 c4 08 44 89 c0 c3 45 31 c0 83 f8 01
RSP: 0018:ffffa376c2dffca8 EFLAGS: 00210297
RAX: 0000000000000000 RBX: ffff8ecf6b760000 RCX: 0000000000000008
RDX: 0000000000000000 RSI: 000000000000596f RDI: ffff8ecf6db20000
RBP: ffff8ecf6a187000 R08: 0000000000000000 R09: ffff8ecf6f88fc00
R10: 0000000000000001 R11: 0000000000000006 R12: ffff8ecf727ec200
R13: 0000000000000006 R14: ffff8ecf6f982800 R15: ffff8ecf6e749200
FS:  0000000000000000(0000) GS:ffff8ecf7e9c0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb5fb4a8000 CR3: 0000000356446000 CR4: 00000000003506e0
Call Trace:
 dcn10_init_hw+0x6ed/0x930 [amdgpu]
 dc_set_power_state+0xf5/0x140 [amdgpu]
 dm_resume+0x328/0x500 [amdgpu]
 amdgpu_device_ip_resume_phase2+0x52/0xb0 [amdgpu]
 ? amdgpu_device_fw_loading+0x9f/0x110 [amdgpu]
 amdgpu_device_gpu_recover.cold+0x8c1/0xf62 [amdgpu]
 amdgpu_job_timedout+0x11c/0x140 [amdgpu]
 drm_sched_job_timedout+0x72/0xf0 [gpu_sched]
 process_one_work+0x1b4/0x370


There also is this bugzilla about this:
https://bugzilla.redhat.com/show_bug.cgi?id=1929746
from today

And a whole bunch of others:
https://bugzilla.redhat.com/buglist.cgi?quicksearch=amdgpu_dm_backlight_update_status

Any help with resolving this would be much appreciated.

Regards,

Hans