[Bug 85726] New: scrolling on chrome results in "[drm] stuck on render ring" in syslog

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85726

            Bug ID: 85726
           Summary: scrolling on chrome results in "[drm] stuck on render
                    ring" in syslog
           Product: DRI
           Version: XOrg 6.7.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: shacharr at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108750
  --> https://bugs.freedesktop.org/attachment.cgi?id=108750&action=edit
The content of /sys/class/drm/card0/error when the GPU crashed

When scrolling up and down a google inbox in chromium, my computer display
dies. The CPU and network is still available, but the display is completely
black.
I'm running ubuntu 14.04, fully updated to date from official repositories.
The machine is a dell inspiron 1525, with an intel GM965/GL960 display card.

The crash is 100% reproducible, so I can test fixes and provide additional
information as needed.

The syslog message contains the following indicative lines:


Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804220] [drm] stuck on
render ring
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804230] [drm] GPU crash
dump saved to /sys/class/drm/card0/error
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804233] [drm] GPU hangs
can indicate a bug anywhere in the entire gfx stack, including u
serspace.
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804237] [drm] Please file
a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/
Intel
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804240] [drm] drm/i915
developers can then reassign to the right component if it's not a
 kernel issue.
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.804243] [drm] The gpu
crash dump is required to analyze gpu hangs, so please always atta
ch it.
Nov  1 08:08:41 shacharr-Inspiron-1525 kernel: [35964.805413]
[drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0xb839000 ctx
0)
 at 0xb83975c
Nov  1 08:08:42 shacharr-Inspiron-1525 kernel: [35965.316262] [drm:i915_reset]
*ERROR* Failed to reset chip.
Nov  1 08:08:46 shacharr-Inspiron-1525 kernel: [35969.166248] Watchdog[9404]:
segfault at 0 ip 00007f05f4952d98 sp 00007f05e4f2a710 error 6 in
 libcontent.so[7f05f411d000+1170000]
Nov  1 08:08:51 shacharr-Inspiron-1525 kernel: [35974.804172]
[drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for the gpu reset to
com
plete
Nov  1 08:08:52 shacharr-Inspiron-1525 kernel: [35974.908259]
[drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for the gpu reset to
com
plete
Nov  1 08:08:52 shacharr-Inspiron-1525 kernel: [35974.968045] [drm] GMBUS [i915
gmbus vga] timed out, falling back to bit banging on pin 2


I attach the dump file from the crash.

--Shachar

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