[Bug 95312] 4.6-rc5: [drm] GPU HANG: ecode 6:-1:0x00000000, reason: Kicking stuck wait on render ring, action: continue

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95312

--- Comment #4 from Martin Mokrejs <mmokrejs at fold.natur.cuni.cz> ---
Created attachment 123542
  --> https://bugs.freedesktop.org/attachment.cgi?id=123542&action=edit
/sys/kernel/debug/dri/0/i915_error_state.bz2

Interestingly, I see I have another, other error state as well?!

# ls -latr /sys/kernel/debug/dri/0/i915_error_state
-rw-r--r-- 1 root root 0 Apr 27 19:05 /sys/kernel/debug/dri/0/i915_error_state
# ls -latr /sys/class/drm/card0/error 
-rw------- 1 root root 0 May  7 22:45 /sys/class/drm/card0/error
#
# w
 23:13:14 up 10 days,  6:07, 32 users,  load average: 2.97, 3.22, 3.29
...

Is the timestamp on /sys/kernel/debug/dri/0/i915_error_state set at bootup?

No, not really:

# grep -a 'syslog-ng starting up' /var/log/messages 
Apr 27 16:11:54 vostro syslog-ng[3641]: syslog-ng starting up; version='3.6.2'
Apr 27 16:21:46 vostro syslog-ng[3301]: syslog-ng starting up; version='3.6.2'
Apr 27 16:27:58 vostro syslog-ng[3328]: syslog-ng starting up; version='3.6.2'
Apr 27 16:31:54 vostro syslog-ng[3639]: syslog-ng starting up; version='3.6.2'
Apr 27 17:06:08 vostro syslog-ng[3642]: syslog-ng starting up; version='3.6.2'
#
grep -a '^Apr 27 19:0' /var/log/messages
... [ gives me no clue why i915_error_state was created, syslogd was running
but that is all I can say ]
#


But from /var/log/messages I see during previous bootup I had a different
issue:

Apr 27 16:12:46 vostro kernel: [drm:intel_cpu_fifo_underrun_irq_handler]
*ERROR* CPU pipe A FIFO underrun
Apr 27 16:12:46 vostro kernel: [drm:intel_set_pch_fifo_underrun_reporting]
*ERROR* uncleared pch fifo underrun on pch transcoder A
Apr 27 16:12:46 vostro kernel: [drm:intel_pch_fifo_underrun_irq_handler]
*ERROR* PCH transcoder A FIFO underrun
Apr 27 16:12:46 vostro kernel: [drm:intel_cpu_fifo_underrun_irq_handler]
*ERROR* CPU pipe B FIFO underrun
Apr 27 16:12:46 vostro kernel: [drm:intel_check_pch_fifo_underruns] *ERROR* pch
fifo underrun on pch transcoder B


but I was inserting and ejecting my ExpressCards into the slot a few second
after this message was logged in, probably that is related to it.

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