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

[bugzilla-daemon at freedesktop.org]

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

            Bug ID: 90136
           Summary: [SKL]Webglc sporadically causes system hang
           Product: DRI
           Version: unspecified
          Hardware: All
                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 115262
  --> https://bugs.freedesktop.org/attachment.cgi?id=115262&action=edit
case list

==System Environment==
--------------------------
Regression: not sure, Only meet once.

Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/b9fe357740009b89d4bac30b297bfe9808957e6a
commit b9fe357740009b89d4bac30b297bfe9808957e6a
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Apr 20 10:28:37 2015 -0700

    drm-intel-nightly: 2015y-04m-20d-17h-28m-16s UTC integration manifest

==Bug detailed description==
-----------------------------
Run full weblgc case on SKL-Y with the latest drm-intel-nightly and mesa master
branch. executed attached case list, then system hang, ssh works well, run
reboot, system is no response.
I meet it once, then run 4 cycles, I am unable to reproduce it.

dmesg:
[12816.875799] WARNING: CPU: 0 PID: 26375 at
drivers/gpu/drm/i915/i915_gem_gtt.c:504 gen8_ppgtt_clear_range+0xcd/0x16e
[i915]()
[12816.875803] WARN_ON(!pd->page_table[pde])
[12816.875806] Modules linked in: dm_mod snd_hda_codec_realtek
snd_hda_codec_generic ppdev snd_hda_intel snd_hda_controller snd_hda_codec
snd_hda_core snd_hwdep snd_pcm pcspkr snd_timer i2c_i801 snd soundcore joydev
wmi battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper
drm
[12816.875845] CPU: 0 PID: 26375 Comm: chrome Tainted: G        W      
4.0.0_drm-intel-nightly_b9fe35_20150421+ #368
[12816.875849] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.B067.R00.1412310711 12/31/2014
[12816.875852]  0000000000000000 0000000000000009 ffffffff81795847
ffff880147693508
[12816.875859]  ffffffff8103bd5a ffffffff8103bafd ffffffffa0098277
0000000000000000
[12816.875863]  000000009b37f083 0000000000000000 0000000000000013
0000000000000a6c
[12816.875868] Call Trace:
[12816.875874]  [<ffffffff81795847>] ? dump_stack+0x40/0x50
[12816.875881]  [<ffffffff8103bd5a>] ? warn_slowpath_common+0x98/0xb0
[12816.875887]  [<ffffffff8103bafd>] ? add_taint+0x2a/0x2c
[12816.875909]  [<ffffffffa0098277>] ? gen8_ppgtt_clear_range+0xcd/0x16e [i915]
[12816.875916]  [<ffffffff8103bdb7>] ? warn_slowpath_fmt+0x45/0x4a
[12816.875938]  [<ffffffffa0098211>] ? gen8_ppgtt_clear_range+0x67/0x16e [i915]
[12816.875959]  [<ffffffffa0098277>] ? gen8_ppgtt_clear_range+0xcd/0x16e [i915]
[12816.875984]  [<ffffffffa00a0355>] ? i915_vma_unbind+0xb9/0x1e6 [i915]
[12816.876009]  [<ffffffffa00a2b23>] ? i915_gem_shrink+0x166/0x1dc [i915]
[12816.876032]  [<ffffffffa00a2bf9>] ? i915_gem_shrinker_scan+0x60/0x81 [i915]
[12816.876038]  [<ffffffff810de3b3>] ?
shrink_slab.part.57.constprop.67+0x1a5/0x2b5
[12816.876044]  [<ffffffff810e038b>] ? shrink_zone+0x67/0x92
[12816.876049]  [<ffffffff810e0771>] ? do_try_to_free_pages+0x20d/0x241
[12816.876055]  [<ffffffff810e0871>] ? try_to_free_pages+0xcc/0x108
[12816.876061]  [<ffffffff810d7b46>] ? __alloc_pages_nodemask+0x48e/0x6fc
[12816.876067]  [<ffffffff81104767>] ? alloc_pages_current+0xad/0xca
[12816.876089]  [<ffffffffa0097cdd>] ? alloc_pt_single+0x75/0x131 [i915]
[12816.876111]  [<ffffffffa009975f>] ? gen8_alloc_va_range+0x2ae/0x6cc [i915]
[12816.876136]  [<ffffffffa009add9>] ? i915_vma_bind+0x9e/0x454 [i915]
[12816.876141]  [<ffffffff81355064>] ? swiotlb_map_sg_attrs+0x84/0x10c
[12816.876166]  [<ffffffffa00a0b2f>] ? i915_gem_object_do_pin+0x6ad/0x77f
[i915]
[12816.876188]  [<ffffffffa0094fc1>] ?
i915_gem_execbuffer_reserve_vma.isra.12+0x5d/0x103 [i915]
[12816.876212]  [<ffffffffa00952b3>] ? i915_gem_execbuffer_reserve+0x24c/0x2e3
[i915]
[12816.876256]  [<ffffffffa0095916>] ?
i915_gem_do_execbuffer.isra.13+0x5cc/0xd88 [i915]
[12816.876277]  [<ffffffff8133543a>] ? idr_get_empty_slot+0x1c5/0x2c4
[12816.876297]  [<ffffffff81334f23>] ? idr_mark_full+0x2b/0x52
[12816.876319]  [<ffffffff81109093>] ? kmem_cache_alloc_trace+0x2a/0xfb
[12816.876348]  [<ffffffffa0017cbc>] ? drm_vma_node_allow+0xaa/0xb2 [drm]
[12816.876364]  [<ffffffff8110948a>] ? __kmalloc+0x65/0x13d
[12816.876390]  [<ffffffffa0097085>] ? i915_gem_execbuffer2+0x16e/0x205 [i915]
[12816.876410]  [<ffffffffa00047ae>] ? drm_ioctl+0x322/0x38d [drm]
[12816.876417]  [<ffffffff81115db7>] ? pipe_read+0x211/0x227
[12816.876446]  [<ffffffffa0096f17>] ? i915_gem_execbuffer+0x339/0x339 [i915]
[12816.876453]  [<ffffffff8110ed0c>] ? new_sync_read+0x6b/0x8f
[12816.876462]  [<ffffffff810a84bb>] ? seccomp_phase1+0x1b7/0x1f0
[12816.876470]  [<ffffffff8111daa6>] ? do_vfs_ioctl+0x360/0x424
[12816.876478]  [<ffffffff8100d3e9>] ? syscall_trace_enter_phase1+0xe4/0x123
[12816.876487]  [<ffffffff8111dbb3>] ? SyS_ioctl+0x49/0x7a
[12816.876506]  [<ffffffff8179b0f2>] ? system_call_fastpath+0x12/0x17
[12816.876518] ---[ end trace c9f0c31965899e15 ]---

==Reproduce steps==
---------------------------- 
1. xinit
2. run full webglc case
https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html

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