[Bug 88987] New: [BSW PPGTT]igt/gem_ring_sync_loop causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88987

            Bug ID: 88987
           Summary: [BSW PPGTT]igt/gem_ring_sync_loop causes system hang
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          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 113177
  --> https://bugs.freedesktop.org/attachment.cgi?id=113177&action=edit
dmesg

==System Environment==
--------------------------
Regression: yes, caused by ppgtt

no-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/9583cb470cd82997b5f23d4acab852563f5c0047
commit 9583cb470cd82997b5f23d4acab852563f5c0047
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Feb 4 15:22:12 2015 +0100

    drm-intel-nightly: 2015y-02m-04d-14h-21m-52s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes system hang, ctrl+c, it also doesn't exit.  i915.enable_ppgtt=0, it
works well.
IGT-Version: 1.9-g87edb51 (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_9583cb_20150205+ x86_64)

^C^C^C^C^C^C^C^C

dmesg:
[   34.751917] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer
elapsed... render ring idle
[   62.753026] [drm] stuck on render ring
[   62.753038] ------------[ cut here ]------------
[   62.753090] WARNING: CPU: 1 PID: 1021 at
drivers/gpu/drm/i915/i915_irq.c:2612 i915_handle_error+0x58/0x5bd [i915]()
[   62.753095] WARN_ON(mutex_is_locked(&dev_priv->dev->struct_mutex))
[   62.753098] Modules linked in: ipv6 bnep bluetooth rfkill dm_mod
snd_hda_codec_hdmi iTCO_wdt iTCO_vendor_support snd_hda_codec_realtek
snd_hda_codec_generic pcspkr serio_raw snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep i2c_i801 snd_pcm lpc_ich mfd_core snd_timer snd
soundcore battery ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcopyarea
[   62.753166] CPU: 1 PID: 1021 Comm: kworker/u8:3 Tainted: G        W     
3.19.0-rc7_drm-intel-nightly_9583cb_20150205+ #78
[   62.753205] Workqueue: i915-hangcheck i915_hangcheck_elapsed [i915]
[   62.753210]  0000000000000000 0000000000000009 ffffffff8179a69b
ffff88007b9efcc8
[   62.753217]  ffffffff8103bdec 0000000000000246 ffffffffa00b6edb
0000000000000006
[   62.753223]  ffff88017a42bb40 ffff880175418ad0 ffff8801759e7000
ffff8801755dac00
[   62.753231] Call Trace:
[   62.753246]  [<ffffffff8179a69b>] ? dump_stack+0x40/0x50
[   62.753260]  [<ffffffff8103bdec>] ? warn_slowpath_common+0x98/0xb0
[   62.753294]  [<ffffffffa00b6edb>] ? i915_handle_error+0x58/0x5bd [i915]
[   62.753301]  [<ffffffff8103be9c>] ? warn_slowpath_fmt+0x45/0x4a
[   62.753335]  [<ffffffffa00b6edb>] ? i915_handle_error+0x58/0x5bd [i915]
[   62.753343]  [<ffffffff81797406>] ? printk+0x48/0x4d
[   62.753378]  [<ffffffffa00b77b7>] ? i915_hangcheck_elapsed+0x339/0x3d5
[i915]
[   62.753389]  [<ffffffff8104d128>] ? process_one_work+0x1ad/0x31a
[   62.753397]  [<ffffffff8104d4ef>] ? worker_thread+0x235/0x330
[   62.753404]  [<ffffffff8104d2ba>] ? process_scheduled_works+0x25/0x25
[   62.753411]  [<ffffffff81050dee>] ? kthread+0xc5/0xcd
[   62.753418]  [<ffffffff81050d29>] ? kthread_freezable_should_stop+0x40/0x40
[   62.753425]  [<ffffffff8179ffec>] ? ret_from_fork+0x7c/0xb0
[   62.753431]  [<ffffffff81050d29>] ? kthread_freezable_should_stop+0x40/0x40
[   62.753437] ---[ end trace 05682ea912c21a80 ]---

==Reproduce steps==
---------------------------- 
1. ./gem_ring_sync_loop

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