[Bug 85084] New: [BYT Regression]igt/gem_userptr_blits subcases cause "WARNING: CPU: 0 PID: 4681 at drivers/gpu/drm/i915/i915_gem_userptr.c:86 cancel_userptr+0xb6/0xf8 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85084

            Bug ID: 85084
           Summary: [BYT Regression]igt/gem_userptr_blits subcases cause
                    "WARNING: CPU: 0 PID: 4681 at
                    drivers/gpu/drm/i915/i915_gem_userptr.c:86
                    cancel_userptr+0xb6/0xf8 [i915]()"
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisect_pending
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 107916
  --> https://bugs.freedesktop.org/attachment.cgi?id=107916&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
It's a igt regression bug 
Good commit: 2faf5a8665bba9ab7ad64ac6aa8c13be8f176d7d
Bud commit: 303fe742fcdd7da6f03f948a4e41b529ee39613a

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 2ea23cd593ba60ead60e2f796fae675aa4475b1a(fails)
    drm-intel-nightly: 2014y-10m-13d-09h-34m-29s UTC integration manifest
origin/drm-intel-next-queued: fff95501f2095fa8a9dbd7e177bbf642d241b2fe(fails)
    drm/i915: intel_backlight scale() math WA
origin/drm-intel-fixes: bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9(fails)
    Linux 3.17

==Bug detailed description==
igt/gem_userptr_blits subcases cause "WARNING: CPU: 0 PID: 4681 at
drivers/gpu/drm/i915/i915_gem_userptr.c:86 cancel_userptr+0xb6/0xf8 [i915]()"

Case list:
igt/gem_userptr_blits/forked-sync-swapping-multifd-mempressure-interruptible
igt/gem_userptr_blits/forked-sync-swapping-multifd-mempressure-normal


Output:
"root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#
./gem_userptr_blits --run-subtest
forked-sync-swapping-multifd-mempressure-interruptible
IGT-Version: 1.8-ga0b5c6d (x86_64) (Linux:
3.17.0_drm-intel-nightly_2ea23c_20141016+ x86_64)
Aperture size is 2048 MiB
Total RAM is 3837 MiB
Testing unsynchronized mappings...
Testing synchronized mappings...
Subtest forked-sync-swapping-multifd-mempressure-interruptible: SUCCESS
(97.534s)
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
""<[1-4]>""|grep drm                                           <4>[ 
346.029662] WARNING: CPU: 3 PID: 4365 at
drivers/gpu/drm/i915/i915_gem_userptr.c:86 cancel_userptr+0xb6/0xf8 [i915]()
<4>[  346.029665] Modules linked in: dm_mod snd_hda_codec_hdmi
snd_hda_codec_conexant snd_hda_codec_generic iTCO_wdt iTCO_vendor_support
snd_hda_intel snd_hda_controller pcspkr snd_hda_codec snd_hwdep snd_pcm r8169
i2c_i801 snd_timer snd lpc_ich soundcore mfd_core iosf_mbi battery wmi ac
acpi_cpufreq uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core
v4l2_common videodev i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  346.029704] CPU: 3 PID: 4365 Comm: gem_userptr_bli Not tainted
3.17.0_drm-intel-nightly_2ea23c_20141016+ #550"

==Reproduce steps==
---------------------------- 
1. ./gem_userptr_blits --run-subtest
forked-sync-swapping-multifd-mempressure-interruptible

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