[Bug 57136] [GM45 regression] GPU hang during disk io

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57136

--- Comment #42 from Tom London <selinux at gmail.com> ---
Created attachment 72801
  --> https://bugs.freedesktop.org/attachment.cgi?id=72801&action=edit
tar.gz included 'dmesg', i915_error_state, etc.

kernel with just the one patch (remove-MI_FLUSH) hangs/crashes under my "cat
big-files >/dev/null" test.

Here is the dmesg spew:

[  178.704031] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[  178.704039] [drm] capturing error event; look for more information in
/debug/dri/0/i915_error_state
[  188.704040] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[  188.757040] [drm:init_ring_common] *ERROR* render ring initialization failed
ctl 0001f001 head 00003000 tail 00000000 start 00003000
[  190.704040] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[  190.704160] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
[  190.704163] [drm:i915_reset] *ERROR* Failed to reset chip.
[  201.972860] gnome-shell[1927]: segfault at 230 ip 00007fbcbf78989f sp
00007fff8ae7ac00 error 4 in i965_dri.so[7fbcbf737000+b3000]

Here are the first few lines from i915_error_state:

Time: 1357847009 s 606144 us
PCI ID: 0x2a42
EIR: 0x00000000
IER: 0x02028c53
PGTBL_ER: 0x00000000
CCID: 0x00000000
  fence[0] = 00000000
  fence[1] = 00000000
  fence[2] = 00000000

Hope this helps....

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