[Bug 105018] Kernel panic when waking up after screen goes blank.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105018

--- Comment #21 from L.S.S. <ragnaros39216 at yandex.com> ---
Another problem: When I woke up the screen, sometimes the system would have
intermittent soft lockups that made the system kind of unusable... This is
after I included the patch to the latest 4.15 kernel, 4.15.5 (4.15.5-1-MANJARO)

In journalctl I find the following phenomenon. During its sleep the error
"failed to get VBLANK" is being written every 20s.

Feb 27 11:57:29 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:57:49 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:58:09 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:58:29 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:58:49 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:59:09 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:59:29 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!
Feb 27 11:59:49 linuxsys kernel: [drm:dm_logger_write [amdgpu]] *ERROR* Failed
to get VBLANK!

After I woke the screen up and I get the intermittent soft lockup issue, the
error "dc_stream_state is NULL for crtc '1'" is written multiple times from
either dm_vblank_get_counter or dm_crtc_get_scanoutpos every 8 or 18 seconds,
which seemed to correspond to the lockup interval. I did not test the issue
further as the system was almost unusable due to the lockup and I had to
reboot.

Feb 27 12:17:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:08 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:08 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:16 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:34 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:17:42 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:00 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:08 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
...
Feb 27 12:18:26 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:26 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:26 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:26 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:26 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:26 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_crtc_get_scanoutpos [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!
Feb 27 12:18:35 linuxsys kernel: [drm:dm_vblank_get_counter [amdgpu]] *ERROR*
dc_stream_state is NULL for crtc '1'!

Unfortunately, this issue is random and I could not always reproduce it. It
just happens from time to time.

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