[Bug 90008] [BSW/SKL]Piglit sporadically causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90008

--- Comment #7 from lu hua <huax.lu at intel.com> ---
Created attachment 115908
  --> https://bugs.freedesktop.org/attachment.cgi?id=115908&action=edit
dmesg(without kernel.printk="7417")

comment 6's dmesg with "sysctl -w kernel.printk="7417"".
Retest without "sysctl -w kernel.printk="7417"", call trace is clear. 

[  761.617901] BUG: unable to handle kernel paging request at 00007f9ee1236008
[  761.704932] IP: [<ffffffff817ade61>] error_entry+0x1/0x5b
[  761.773069] PGD 175b80067 PUD 0 
[  761.815214] Thread overran stack, or stack corrupted
[  761.878022] Oops: 0002 [#1] SMP 
[  761.920190] Modules linked in: ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt iTCO_vendor_support
serio_raw pcspkr i2c_i801 lpc_ich mfd_core snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore battery ac acpi_cpufreq
i915 button[  762.231906] gmain[4824]: segfault at a940 ip 000000000000a940 sp
00007fea30e81d80 error 14 in accounts-daemon[400000+26000]

[  762.376039]  video drm_kms_helper drm
[  762.430270] CPU: 1 PID: 5360 Comm: python Not tainted
4.1.0-rc3_drm-intel-nightly_056608_20150519+ #410
[  762.547037] task: ffff880178216240 ti: ffff88006ae40000 task.ti:
ffff88006ae40000
[  762.640897] RIP: 0010:[<ffffffff817ade61>]  [<ffffffff817ade61>]
error_entry+0x1/0x5b
[  762.739098] RSP: 0000:ffff88006ae43ef0  EFLAGS: 00010092
[  762.806946] RAX: 0000000000000004 RBX: fa9af535ea216240 RCX:
0000000000000000
[  762.896755] RDX: 00007f09f5cfc0c0 RSI: 00007f09f791a3b0 RDI:
00007f09fa4ee5e9
[  762.986599] RBP: ec5ca7b044216240 R08: ffff880175474a80 R09:
00007f09e8022000
[  763.076428] R10: ffff880178216620 R11: 9b96372c6f000000 R12:
c490f629e7b55d88
[  763.166257] R13: 9f4a419c87103000 R14: 286a50d5df040d87 R15:
df02be047c216240
[  763.256080] FS:  00007f09f5cfd700(0000) GS:ffff88017fc80000(0000)
knlGS:0000000000000000
[  763.357378] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  763.430585] CR2: 00007f9ee1236008 CR3: 00000001754bf000 CR4:
00000000001006e0
[  763.520480] Stack:
[  763.548896]  ffffffff817add1c 0000000000000000 ffff880178216240
ffffffff8103f557
[  763.642527]  ffff88017a411128 ffff88017a411128 0000000000000000
0000000001128fb0
[  763.736242]  0000000001425ac0 00007f09f7cf3a70 f4e4bcc0d163fdd0
0d124f3036000000
[  763.830004] Call Trace:
[  763.863917]  [<ffffffff817add1c>] ? page_fault+0xc/0x30
[  763.931234]  [<ffffffff8103f557>] ? task_stopped_code+0x3a/0x3a
[  764.006943]  [<ffffffff817ade61>] ? error_entry+0x1/0x5b
[  764.075405]  [<ffffffff817add1c>] ? page_fault+0xc/0x30
[  764.142824] Code: 4c 8b 44 24 48 48 [  764.181178] PANIC: double fault,
error_code: 0x0
[  764.181186] CPU: 2 PID: 5373 Comm: ext_framebuffer Not tainted
4.1.0-rc3_drm-intel-nightly_056608_20150519+ #410
[  764.181192] task: ffff880178866240 ti: ffff88006ae54000 task.ti:
ffff88006ae54000
[  764.181195] RIP: 0010:[<ffffffff817add17>]  [<ffffffff817add17>]
page_fault+0x7/0x30
[  764.181208] RSP: 0000:ffff8800201fffd8  EFLAGS: 00010096
[  764.181209] RAX: 00000000817ace77 RBX: 0000000000000001 RCX:
ffffffff817ace77
[  764.181212] RDX: 000000000000a940 RSI: 0000000000000000 RDI:
ffff880020200098
[  764.181213] RBP: 0000000000000009 R08: 0000000000000000 R09:
0000000000000001
[  764.181215] R10: 0000000000000034 R11: 0000000002104d60 R12:
00007f9ee8da2e10
[  764.181218] R13: 00007f9ee8da0038 R14: 000000000000008e R15:
0000000000000000
[  764.181220] FS:  00007f9ee8dc7780(0000) GS:ffff88017fd00000(0000)
knlGS:0000000000000000
[  764.181222] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  764.181224] CR2: ffff8800201fffc8 CR3: 000000006e080000 CR4:
00000000001006e0
[  764.181226] Stack:

[  765.382838] 8b 44 24 50 48 8b 4c 24 58 48 8b 54 24 60 48 8b 74 24 68 48 8b
7c 24 70 48 81 c4 80 00 00 00 e9 10 f0 ff ff fc <4c> 89 5c 24 38 4c 89 54 24 40
4c 89 4c 24 48 4c 89 44 24 50 48 
[  765.603067] RIP  [<ffffffff817ade61>] error_entry+0x1/0x5b
[  765.674383]  RSP <ffff88006ae43ef0>
[  765.721595] CR2: 00007f9ee1236008
[  765.766899] BUG: unable to handle kernel paging request at 0000000000010092
[  765.856096] IP: [<ffffffff81127340>] __d_lookup_rcu+0x65/0x123
[  765.931681] PGD 1754bd067 PUD 179d7e067 PMD 0 
[  765.990816] Oops: 0000 [#2] SMP 
[  766.035223] Modules linked in: ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt iTCO_vendor_support
serio_raw pcspkr i2c_i801 lpc_ich mfd_core snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_pcm snd_timer snd soundcore battery ac acpi_cpufreq
i915 button video drm_kms_helper drm
[  766.390273] CPU: 1 PID: 5380 Comm: kworker/u8:1 Not tainted
4.1.0-rc3_drm-intel-nightly_056608_20150519+ #410
[  766.515404] task: ffff8801782149b0 ti: ffff88006aec8000 task.ti:
ffff88006aec8000
[  766.611410] RIP: 0010:[<ffffffff81127340>]  [<ffffffff81127340>]
__d_lookup_rcu+0x65/0x123
[  766.716978] RSP: 0018:ffff88006aecbb88  EFLAGS: 00010206
[  766.786973] RAX: 0000000000000003 RBX: 0000000000010096 RCX:
000000000000000d
[  766.878871] RDX: 0000000000000000 RSI: ffff88006aecbd88 RDI:
ffff880076938300
[  766.970767] RBP: 000000000001008e R08: 8080808080808080 R09:
fefefefefefefeff
[  767.062698] R10: 2f2f2f2f2f2f2f2f R11: ffff88006aecbc04 R12:
000000037797fe36
[  767.154668] R13: ffff880002cc701d R14: ffff88006aecbd88 R15:
ffff880076938300
[  767.246650] FS:  0000000000000000(0000) GS:ffff88017fc80000(0000)
knlGS:0000000000000000
[  767.350164] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  767.425536] CR2: 0000000000010092 CR3: 00000001754bf000 CR4:
00000000001006e0

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