[Bug 78274] [BDW Bisected]BUG: unable to handle kernel paging request at ffffc900110a0000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78274

--- Comment #4 from lu hua <huax.lu at intel.com> ---
Many igt cases also have this issue.
Run ./gem_exec_nop --run-subtest render, It doesn't exit testing.
output:
IGT-Version: 1.6-g4bd9fe6 (x86_64) (Linux:
3.15.0-rc3_drm-intel-nightly_5e83a7_20140506+ x86_64)
Time to exec x 1:               128.000µs (ring=render)
Time to exec x 2:                74.000µs (ring=render)
Time to exec x 4:                29.000µs (ring=render)
Time to exec x 8:                19.125µs (ring=render)
Time to exec x 16:               11.875µs (ring=render)
Time to exec x 32:                6.656µs (ring=render)
Time to exec x 64:                6.016µs (ring=render)
Time to exec x 128:               5.078µs (ring=render)
Time to exec x 256:               4.672µs (ring=render)

dmesg
[  128.955986] BUG: unable to handle kernel paging request at ffffc900110a0000
[  128.956037] IP: [<ffffffff812e6803>] iowrite32+0xe/0x28
[  128.956075] PGD 14a80e067 PUD 14a80f067 PMD 145448067 PTE 0
[  128.956117] Oops: 0002 [#1] SMP
[  128.956142] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support ppdev snd_hda_intel snd_hda_controller pcspkr i2c_i801
snd_hda_codec snd_hwdep snd_pcm lpc_ich mfd_core snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 video button drm_kms_helper drm
[  128.956348] CPU: 0 PID: 4569 Comm: gem_exec_nop Not tainted
3.15.0-rc3_drm-intel-nightly_5e83a7_20140506+ #2350
[  128.956407] task: ffff88014651de80 ti: ffff8801448a8000 task.ti:
ffff8801448a8000
[  128.956452] RIP: 0010:[<ffffffff812e6803>]  [<ffffffff812e6803>]
iowrite32+0xe/0x28
[  128.956501] RSP: 0018:ffff8801448a9c00  EFLAGS: 00010292
[  128.956534] RAX: 00000000fffff38f RBX: ffff880002d41780 RCX:
000000000001ffd8
[  128.956573] RDX: 000000000001ffe8 RSI: ffffc900110a0000 RDI:
ffffc900110a0000
[  128.956613] RBP: 0000000000000002 R08: 00000000000144c0 R09:
ffff8800a8bbae78
[  128.956655] R10: ffff8800a8bbae78 R11: 0000000000000000 R12:
ffff880002d40000
[  128.956695] R13: 0000000000000000 R14: 0000000000022040 R15:
ffff8800a3831120
[  128.956738] FS:  00007ff717b848c0(0000) GS:ffff88014f400000(0000)
knlGS:0000000000000000
[  128.956784] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  128.956815] CR2: ffffc900110a0000 CR3: 000000014488d000 CR4:
00000000003407f0
[  128.956859] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  128.956902] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  128.956945] Stack:
[  128.956959]  ffffffffa008a5fe 000000000081c000 0000000000000004
ffff880002d41780
[  128.957008]  ffff880002d40000 ffff8800a88c7200 0000000000000000
ffff880002d41780
[  128.957056]  ffffffffa0089960 ffff8800a88c7200 ffffffffa008c364
0000000000000000
[  128.957104] Call Trace:
[  128.957135]  [<ffffffffa008a5fe>] ? gen6_signal+0xd7/0x10c [i915]
[  128.957182]  [<ffffffffa0089960>] ? gen6_add_request+0x13/0x88 [i915]
[  128.957229]  [<ffffffffa008c364>] ? intel_ring_flush_all_caches+0x1c/0x29
[i915]
[  128.957283]  [<ffffffffa007916c>] ? __i915_add_request+0x1c4/0x1e3 [i915]
[  128.957333]  [<ffffffffa0074eb1>] ?
i915_gem_do_execbuffer.isra.16+0x1005/0x1147 [i915]
[  128.957383]  [<ffffffff81051aae>] ? ttwu_do_wakeup+0xe/0x79
[  128.957426]  [<ffffffffa00754c1>] ? i915_gem_execbuffer2+0x177/0x1fa [i915]
[  128.957474]  [<ffffffffa0002f52>] ? drm_ioctl+0x25c/0x3ad [drm]
[  128.957515]  [<ffffffffa007534a>] ? i915_gem_execbuffer+0x357/0x357 [i915]
[  128.957560]  [<ffffffff81726343>] ? __schedule+0x638/0x77e
[  128.957595]  [<ffffffff810eea63>] ? do_vfs_ioctl+0x3ec/0x435
[  128.957633]  [<ffffffff810eeaf5>] ? SyS_ioctl+0x49/0x78
[  128.957668]  [<ffffffff8172dba2>] ? system_call_fastpath+0x16/0x1b
[  128.957706] Code: 48 89 f7 76 05 e9 45 5b d4 ff 48 81 fe 00 00 01 00 77 09
48 c7 c6 2d a1 9b 81 eb aa c3 48 81 fe ff ff 03 00 89 f8 48 89 f7 76 03 <89> 06
c3 48 81 fe 00 00 01 00 76 05 0f b7 d6 ef c3 48 c7 c6 86
[  128.957942] RIP  [<ffffffff812e6803>] iowrite32+0xe/0x28
[  128.957978]  RSP <ffff8801448a9c00>
[  128.958000] CR2: ffffc900110a0000
[  128.958021] ---[ end trace 13d907d4a9e6b3e4 ]---

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