[Bug 111805] Constant "Resetting rcs0 for hang on rcs0" and machine lockup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111805

--- Comment #40 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
Created attachment 145926
  --> https://bugs.freedesktop.org/attachment.cgi?id=145926&action=edit
sys-class-drm-card0-error.txt

Just got a hang again, on drm-tip:

* 41eb27f39e60 - (drm-tip/drm-tip) drm-tip: 2019y-11m-07d-17h-06m-16s UTC
integration manifest (2 days ago) <Chris Wilson>

Both IntelliJ and Firefox open, on USB-C 5K monitor. Firefox was animating its
sidebar drawer close, when it suddenly froze.

Surprisingly, GPU recovered and I'm writing this message in Firefox.

Althought I see now's it constantly spewing "kernel: i915 0000:00:02.0:
Resetting rcs0 for stopped heartbeat on rcs0" every 3 seconds.

DRM card0 error log attached.

EDIT while I was writing this message, machine suddenly went autonomously into
suspend and, I think simultaneously, gnome-shell died with "i965: Failed to
submit batchbuffer: Input/output error"

```
nov   09 19:42:53 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:42:56 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:42:59 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:02 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:05 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:08 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:11 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:14 papaya kernel: i915 0000:00:02.0: Resetting rcs0 for stopped
heartbeat on rcs0                                                               
nov   09 19:43:14 papaya org.gnome.Shell.desktop[10561]: i965: Failed to submit
batchbuffer: Input/output error                                                 
nov   09 19:43:14 papaya polkitd[9832]: Unregistered Authentication Agent for
unix-session:3 (system bus name :1.72, object path
/org/freedesktop/PolicyKit1/AuthenticationAgent, locale et_EE.u
tf8) (disconnected from bus)                                                    
nov   09 19:43:14 papaya gnome-session[10493]: gnome-session-binary[10493]:
WARNING: App 'org.gnome.Shell.desktop' exited with code 1                       
nov   09 19:43:14 papaya gnome-session-binary[10493]: WARNING: App
'org.gnome.Shell.desktop' exited with code 1
```

After gdm restart, kernel log is staying clean, so looks like some kind of a
graphics stack reset happened.

(PS All hail Firefox, who successfully saved all typed work in the form, when
the session died.)

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