[Bug 67511] New: [ILK Regression]igt/gem_suspend/fence-restore-untiled causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67511

          Priority: high
            Bug ID: 67511
                CC: xunx.fang at intel.com, yangweix.shui at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [ILK Regression]igt/gem_suspend/fence-restore-untiled
                    causes system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------
Platform:    Ironlake
Kernel:     (drm-intel-next-queued)fae5cbff3e3e4097de2e76178d462b90626c2bdb

Bug detailed description:
-----------------------------
It causes system hang on ironlake with -queued, -fixes, -nightly kernel.

The latest known good commit:d861e3387650296f1fca2a4dd0dcd380c8fdddad.
The latest known bad commit: 3b27af3560f3cfe4e09171024515fa304ebae93b

output:
rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jul 30 02:46:39 2013

dmesg:
[  146.062106] console [netcon0] enabled
[  146.105912] netconsole: network logging started
[  146.710959] console [netcon0] enabled
[  146.754781] netconsole: network logging started
[  163.758369] [drm:i915_driver_open],
[  163.801444] [drm:intel_crtc_cursor_set], cursor off
[  163.860075] [drm:intel_crtc_set_config], [CRTC:3] [FB:35] #connectors=1 (x
y) (0 0)
[  163.951996] [drm:intel_modeset_stage_output_state], [CONNECTOR:7:VGA-1] to
[CRTC:3]
[  164.043930] [drm:intel_crtc_cursor_set], cursor off
[  164.102627] [drm:intel_crtc_set_config], [CRTC:5] [NOFB]
[  164.166476] [drm:intel_modeset_stage_output_state], [CONNECTOR:7:VGA-1] to
[CRTC:3]
[  164.258379] [drm:i915_driver_open],
[  164.448192] PM: Syncing filesystems ... done.
[  164.500798] PM: Preparing system for mem sleep
[  164.554220] Freezing user space processes ... (elapsed 0.001 seconds) done.
[  164.639288] Freezing remaining freezable tasks ... (elapsed 0.001 seconds)
done.
[  164.729662] PM: Entering mem sleep
[  164.770492] Suspending console(s) (use no_console_suspend to debug)
[  164.845552] hpet1: lost 2 rtc interrupts
[  164.892579] hpet1: lost 2 rtc interrupts
[  164.939584] hpet1: lost 2 rtc interrupts
[  164.986591] hpet1: lost 2 rtc interrupts
[  165.033598] hpet1: lost 2 rtc interrupts
[  165.080622] hpet1: lost 2 rtc interrupts
[  165.127635] hpet1: lost 2 rtc interrupts
[  165.174621] hpet1: lost 2 rtc interrupts
[  165.221628] hpet1: lost 2 rtc interrupts
[  165.268635] hpet1: lost 2 rtc interrupts


Reproduce steps:
----------------------------
1. ./gem_suspend --run-subtest fence-restore-untiled

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