[Bug 88840] New: [BDW]igt/gem_reloc_vs_gpu/faulting-reloc-interruptible-hang causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88840

            Bug ID: 88840
           Summary: [BDW]igt/gem_reloc_vs_gpu/faulting-reloc-interruptible
                    -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 112899
  --> https://bugs.freedesktop.org/attachment.cgi?id=112899&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes
good commit: 6f34cc393f6407fbec91ff6d4fd1e29fe86b59d5
bad commit: 37ec63030b14ad91f3ee9e03385a8904d0aff741

no-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/2c2cd37eb3b97bb8846ac3bf75dcb8b4948922d0
commit 2c2cd37eb3b97bb8846ac3bf75dcb8b4948922d0
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Mon Jan 26 11:39:01 2015 +0200

    drm-intel-nightly: 2015y-01m-26d-09h-38m-30s UTC integration manifest

==Bug detailed description==
-----------------------------
It causes system hang on BDW with -nightly kernel and -next-queued kernel. 

output:
IGT-Version: 1.9-gebd8b32 (x86_64) (Linux:
3.19.0-rc6_drm-intel-nightly_2c2cd3_20150127+ x86_64)
Segmentation fault

dmesg:
[ 1734.800735] CPU: 0 PID: 4980 Comm: gem_reloc_vs_gp Not tainted
3.19.0-rc6_drm-intel-nightly_2c2cd3_20150127+ #982
[ 1734.802447] task: ffff8800a7c46800 ti: ffff880144558000 task.ti:
ffff880144558000
[ 1734.804172] RIP: 0010:[<ffffffff8110da14>]  [<ffffffff8110da14>]
__kmalloc+0x116/0x151
[ 1734.805919] RSP: 0018:ffff88014455bd68  EFLAGS: 00010282
[ 1734.807662] RAX: 0000000000000000 RBX: ffff88014455be18 RCX:
00000000000039fc
[ 1734.809425] RDX: 00000000000039fb RSI: 0000000000081200 RDI:
0000000000015520
[ 1734.811185] RBP: ff8800023b188000 R08: ffff88014ec15520 R09:
0000000040406469
[ 1734.812934] R10: 0000000000000040 R11: 0000000000000246 R12:
ffff88014a003900
[ 1734.814676] R13: 00000000000812d0 R14: 0000000000000070 R15:
ffffffffa009f234
[ 1734.816424] FS:  00007f1fa7cf58c0(0000) GS:ffff88014ec00000(0000)
knlGS:0000000000000000
[ 1734.818194] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1734.819970] CR2: 00007f1fa7d13000 CR3: 00000001497ca000 CR4:
00000000003407f0
[ 1734.821771] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 1734.823570] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 1734.825355] Stack:
[ 1734.827127]  0000000000000246 ffff88014455be18 ffff88014455be18
ffff880148c2f000
[ 1734.828947]  ffff8800a7744200 0000000040406469 ffff8800a7744200
ffffffffa009f234
[ 1734.830777]  ffffffffa009f1b3 ffff88014455be18 00000000fffffff2
ffffffffa01200c0
[ 1734.832614] Call Trace:
[ 1734.834433]  [<ffffffffa009f234>] ? i915_gem_execbuffer2+0x81/0x209 [i915]
[ 1734.836282]  [<ffffffffa009f1b3>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[ 1734.838109]  [<ffffffffa001070a>] ? drm_ioctl+0x279/0x3bc [drm]
[ 1734.839923]  [<ffffffffa009f1b3>] ? i915_gem_execbuffer+0x350/0x350 [i915]
[ 1734.841743]  [<ffffffff81122409>] ? do_vfs_ioctl+0x412/0x459
[ 1734.843545]  [<ffffffff81122499>] ? SyS_ioctl+0x49/0x78
[ 1734.845327]  [<ffffffff8179f792>] ? system_call_fastpath+0x12/0x17
[ 1734.847090] Code: d8 4c 89 f1 48 89 ea 4c 89 fe 41 ff 14 24 49 83 c4 10 49
83 3c 24 00 eb 39 49 89 ec eb 38 49 63 44 24 20 49 8b 3c 24 48 8d 4a 01 <48> 8b
5c 05 00 48 89 e8 65 48 0f c7 0f 0f 94 c0 84 c0 0f 85 7a
[ 1734.849064] RIP  [<ffffffff8110da14>] __kmalloc+0x116/0x151
[ 1734.850895]  RSP <ffff88014455bd68>
[ 1734.852698] [drm:intel_backlight_device_update_status] updating
intel_backlight, brightness=937/937
[ 1734.868381] ---[ end trace d970df286b32461c ]---

==Reproduce steps==
---------------------------- 
1. ./gem_reloc_vs_gpu --run-subtest faulting-reloc-interruptible-hang

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