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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BSW PPGTT]igt/gem_ring_sync_loop causes system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88987">88987</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BSW PPGTT]igt/gem_ring_sync_loop causes system hang
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>critical
</td>
</tr>
<tr>
<th>Priority</th>
<td>high
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=113177" name="attach_113177" title="dmesg">attachment 113177</a> <a href="attachment.cgi?id=113177&action=edit" title="dmesg">[details]</a></span>
dmesg
==System Environment==
--------------------------
Regression: yes, caused by ppgtt
no-working platforms: BSW
==kernel==
--------------------------
drm-intel-nightly/9583cb470cd82997b5f23d4acab852563f5c0047
commit 9583cb470cd82997b5f23d4acab852563f5c0047
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
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</pre>
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