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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW Regression]igt/gem_pread_after_blit/default-hang causes system hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88790">88790</a>
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</tr>
<tr>
<th>Summary</th>
<td>[BDW Regression]igt/gem_pread_after_blit/default-hang 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>
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<pre>Created <span class=""><a href="attachment.cgi?id=112823" name="attach_112823" title="dmesg">attachment 112823</a> <a href="attachment.cgi?id=112823&action=edit" title="dmesg">[details]</a></span>
dmesg
==System Environment==
--------------------------
Regression: yes
good commit: 441406c2a74c8cf651503efa50afc2fc53e6bdd2
bad commit: 518c2e29d566427433b4ebf51f5863b69f8baf4a
no-working platforms: BDW
==kernel==
--------------------------
drm-intel-nightly/67e9eb08a3b967b1ac6b7ec4588a93a2cb030cae
commit 67e9eb08a3b967b1ac6b7ec4588a93a2cb030cae
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date: Fri Jan 23 17:04:55 2015 +0100
drm-intel-nightly: 2015y-01m-23d-16h-04m-34s UTC integration manifest
==Bug detailed description==
-----------------------------
It causes system on drm-intel-nightly and drm-intel-next-queued kernel.
output
IGT-Version: 1.9-gfa94e01 (x86_64) (Linux:
3.19.0-rc5_drm-intel-nightly_67e9eb_20150125+ x86_64)
dmesg:
[ 346.605836] Call Trace:
[ 346.607737] [<ffffffff8112e907>] ? seq_open+0x2c/0x7f
[ 346.609654] [<ffffffff8116d5e5>] ? kernfs_fop_open+0x167/0x2be
[ 346.611574] [<ffffffff8116d47e>] ? kernfs_fop_release+0x4c/0x4c
[ 346.613487] [<ffffffff81112001>] ? do_dentry_open+0x184/0x2a6
[ 346.615470] [<ffffffff8111deec>] ? do_last+0x942/0xb75
[ 346.617364] [<ffffffff8111c2dd>] ? __inode_permission+0x2f/0x6e
[ 346.619261] [<ffffffff8111e251>] ? link_path_walk+0x51/0x74a
[ 346.621146] [<ffffffff8111f6bc>] ? path_openat+0x20f/0x560
[ 346.623018] [<ffffffff81144f0a>] ? ep_read_events_proc+0x92/0x92
[ 346.624889] [<ffffffff81120597>] ? do_filp_open+0x2b/0x6f
[ 346.626746] [<ffffffff81129ba1>] ? __alloc_fd+0x58/0xe3
[ 346.628589] [<ffffffff811131d6>] ? do_sys_open+0x14b/0x1cf
[ 346.630409] [<ffffffff8179f452>] ? system_call_fastpath+0x12/0x17
[ 346.632211] Code: 7e 08 45 89 e1 49 89 d8 4c 89 e9 48 89 ea 4c 89 fe 41 ff
16 49 83 c6 10 49 83 3e 00 eb 30 eb 32 49 63 47 20 4d 8b 07 48 8d 4a 01 <48> 8b
5c 05 00 48 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 75 89 e9
[ 346.634261] RIP [<ffffffff8110dc7e>] kmem_cache_alloc_trace+0xce/0x104
[ 346.636136] RSP <ffff880145ea7bf8>
[ 346.638016] ---[ end trace d02386d5cafd3e6a ]---
==Reproduce steps==
----------------------------
1. ./gem_pread_after_blit --run-subtest default-hang</pre>
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