[Bug 87577] New: [BYT Regression]igt/drv_missed_irq_hang causes warning at drivers/gpu/drm/i915/i915_gem_execbuffer.c:126 eb_lookup_vmas+0x137/0x2ff [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87577

            Bug ID: 87577
           Summary: [BYT Regression]igt/drv_missed_irq_hang causes warning
                    at drivers/gpu/drm/i915/i915_gem_execbuffer.c:126
                    eb_lookup_vmas+0x137/0x2ff [i915]()
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 111146
  --> https://bugs.freedesktop.org/attachment.cgi?id=111146&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes
good commit: 372ee59699d9704086dadb084209542d10e28851
bad commit: 140fd38dc4962ae3694f81900b51c567df1b6d33

==kernel==
--------------------------
drm-intel-nightly/4fa23142a15526f4a4b5df61f26eacdd558a849a
commit 4fa23142a15526f4a4b5df61f26eacdd558a849a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Dec 19 15:33:33 2014 +0100

    drm-intel-nightly: 2014y-12m-19d-14h-33m-07s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes WARNING: CPU: 3 PID: 4428 at
drivers/gpu/drm/i915/i915_gem_execbuffer.c:126 eb_lookup_vmas+0x137/0x2ff
[i915]() on drm-intel-nightly and drm-intel-next-queued kernel. Works well on
-fixes kernel.

output:
Interrupts masked
Interrupts unmasked
Cleared missed interrupts


dmesg:
[  233.078338] ------------[ cut here ]------------
[  233.078372] WARNING: CPU: 3 PID: 4428 at
drivers/gpu/drm/i915/i915_gem_execbuffer.c:126 eb_lookup_vmas+0x137/0x2ff
[i915]()
[  233.078375] GPU use of dumb buffer is illegal.
[  233.078378] Modules linked in: dm_mod uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_core v4l2_common videodev snd_hda_codec_hdmi
snd_hda_codec_conexant snd_hda_codec_generic iTCO_wdt iTCO_vendor_support
snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep pcspkr snd_pcm
snd_timer i2c_i801 lpc_ich snd mfd_core r8169 soundcore battery wmi ac
acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
[  233.078417] CPU: 3 PID: 4428 Comm: gem_exec_blt Not tainted
3.18.0_drm-intel-nightly_4fa231_20141222+ #2936
[  233.078420]  0000000000000000 0000000000000009 ffffffff8178d5e2
ffff88007298bbb8
[  233.078426]  ffffffff8103a8cc ffff880072a1c588 ffffffffa0099bff
ffff880072a1c530
[  233.078430]  ffff88017a14ca80 ffff8801797e2b80 0000000000000002
ffff88007298be18
[  233.078436] Call Trace:
[  233.078446]  [<ffffffff8178d5e2>] ? dump_stack+0x41/0x51
[  233.078453]  [<ffffffff8103a8cc>] ? warn_slowpath_common+0x78/0x90
[  233.078475]  [<ffffffffa0099bff>] ? eb_lookup_vmas+0x137/0x2ff [i915]
[  233.078481]  [<ffffffff8103a97c>] ? warn_slowpath_fmt+0x45/0x4a
[  233.078503]  [<ffffffffa0099bff>] ? eb_lookup_vmas+0x137/0x2ff [i915]
[  233.078525]  [<ffffffffa009a746>] ?
i915_gem_do_execbuffer.isra.12+0x53d/0xcf2 [i915]
[  233.078533]  [<ffffffff81109e65>] ? __kmalloc+0x66/0x149
[  233.078554]  [<ffffffffa009be46>] ? i915_gem_execbuffer2+0x172/0x208 [i915]
[  233.078576]  [<ffffffffa009bcd4>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[  233.078590]  [<ffffffffa00106be>] ? drm_ioctl+0x279/0x3bc [drm]
[  233.078611]  [<ffffffffa009bcd4>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[  233.078619]  [<ffffffff8111e6df>] ? do_vfs_ioctl+0x3ec/0x435
[  233.078625]  [<ffffffff811261e4>] ? __fd_install+0x15/0x43
[  233.078630]  [<ffffffff8111e771>] ? SyS_ioctl+0x49/0x78
[  233.078636]  [<ffffffff81792c92>] ? system_call_fastpath+0x12/0x17
[  233.078640] ---[ end trace 7d0771fa216d9063 ]---

==Reproduce steps==
---------------------------- 
1. ./drv_missed_irq_hang

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