[Bug 88790] New: [BDW Regression]igt/gem_pread_after_blit/default-hang causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88790

            Bug ID: 88790
           Summary: [BDW Regression]igt/gem_pread_after_blit/default-hang
                    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 112823
  --> https://bugs.freedesktop.org/attachment.cgi?id=112823&action=edit
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 <daniel.vetter at ffwll.ch>
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

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