[Bug 90136] [SKL]Webglc sporadically causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90136

--- Comment #4 from lu hua <huax.lu at intel.com> ---
Created attachment 115283
  --> https://bugs.freedesktop.org/attachment.cgi?id=115283&action=edit
dmesg(70614661)

Test on commit 70614661341ffb26de05e84c6958563b45964223, system hang.
Clean boot system, wait 5 minutes or run xinit, system hang. 

dmesg:
[  175.024940] ------------[ cut here ]------------
[  175.024984] WARNING: CPU: 1 PID: 5255 at drivers/gpu/drm/drm_mm.c:367
i915_vma_unbind+0x112/0x1bc [i915]()
[  175.024995] Modules linked in: dm_mod ppdev snd_hda_codec_realtek
snd_hda_codec_generic pcspkr snd_hda_intel snd_hda_controller snd_hda_codec
snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore i2c_i801 joydev wmi
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
[  175.025030] CPU: 1 PID: 5255 Comm: X Not tainted
4.0.0_kcloud_706146_20150423+ #364
[  175.025034] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.B067.R00.1412310711 12/31/2014
[  175.025038]  0000000000000000 0000000000000009 ffffffff81795a87
0000000000000000
[  175.025044]  ffffffff8103bd5a ffff88009ad86d00 ffffffffa00a166b
ffff88009ad86d00
[  175.025050]  ffff8801483c3380 ffff88009ad86d00 0000000000000001
ffff8801442d0000
[  175.025056] Call Trace:
[  175.025068]  [<ffffffff81795a87>] ? dump_stack+0x40/0x50
[  175.025078]  [<ffffffff8103bd5a>] ? warn_slowpath_common+0x98/0xb0
[  175.025109]  [<ffffffffa00a166b>] ? i915_vma_unbind+0x112/0x1bc [i915]
[  175.025137]  [<ffffffffa00a166b>] ? i915_vma_unbind+0x112/0x1bc [i915]
[  175.025163]  [<ffffffffa00a1740>] ? i915_vma_close+0x2b/0x80 [i915]
[  175.025188]  [<ffffffffa00a17fb>] ? i915_gem_close_object+0x66/0x125 [i915]
[  175.025205]  [<ffffffffa0003d35>] ? drm_gem_handle_delete+0xaa/0xbd [drm]
[  175.025221]  [<ffffffffa00047ae>] ? drm_ioctl+0x322/0x38d [drm]
[  175.025241]  [<ffffffffa0003f97>] ? drm_gem_handle_create+0x37/0x37 [drm]
[  175.025248]  [<ffffffff8105ede9>] ? set_next_entity+0x32/0x55
[  175.025257]  [<ffffffff8111dcde>] ? do_vfs_ioctl+0x360/0x424
[  175.025265]  [<ffffffff817987d2>] ? __schedule+0x589/0x7c9
[  175.025271]  [<ffffffff8104fad2>] ? task_work_run+0x84/0x96
[  175.025278]  [<ffffffff8111ddeb>] ? SyS_ioctl+0x49/0x7a
[  175.025284]  [<ffffffff8179b472>] ? system_call_fastpath+0x12/0x17
[  175.025288] ---[ end trace eab6accbedda9078 ]---
[  175.025301] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008

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