linux-kernel - general protection fault on ttm

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Date:	Fri, 6 Jul 2012 22:46:22 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Thomas Hellstrom <thellstrom@...are.com>
Cc:	Dave Airlie <airlied@...hat.com>, dri-devel@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: general protection fault on ttm_init()

Hi Thomas,

I got this error while running kvm boot tests on linux-next.
Attached is the kconfig.

[    7.064962] [drm:drm_core_init] *ERROR* Cannot create /proc/dri
[    7.067443] general protection fault: 0000 [#1] PREEMPT 
[    7.068713] CPU 0 
[    7.068713] Pid: 1, comm: swapper Not tainted 3.5.0-rc5-07204-g646e30b #8 Bochs Bochs
[    7.068713] RIP: 0010:[<ffffffff8105e55b>]  [<ffffffff8105e55b>] __lock_acquire.isra.19+0x64/0x7c9
[    7.068713] RSP: 0018:ffff88000006fd10  EFLAGS: 00010097
[    7.068713] RAX: 0000000000000000 RBX: ffff880000070000 RCX: 0000000000000000
[    7.068713] RDX: 0000000000000000 RSI: 0000000000000000 RDI: a56b6b6b6b6b6e73
[    7.068713] RBP: ffff88000006fd80 R08: 0000000000000000 R09: 0000000000000000
[    7.068713] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000246
[    7.068713] R13: 0000000000000000 R14: 0000000000000000 R15: a56b6b6b6b6b6e73
[    7.068713] FS:  0000000000000000(0000) GS:ffffffff81a24000(0000) knlGS:0000000000000000
[    7.068713] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    7.068713] CR2: 0000000000000000 CR3: 0000000001a12000 CR4: 00000000000006f0
[    7.068713] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    7.068713] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[    7.068713] Process swapper (pid: 1, threadinfo ffff88000006e000, task ffff880000070000)
[    7.068713] Stack:
[    7.068713]  0000000000000000 0000000000000046 ffff88000006fd50 0000000081c40020
[    7.068713]  0000000000000000 ffffffff8105d409 ffff88000006fd90 0000000000000000
[    7.068713]  ffff88000006fde0 ffff880000070000 0000000000000246 ffff8800001c0ab8
[    7.068713] Call Trace:
[    7.068713]  [<ffffffff8105d409>] ? mutex_remove_waiter+0x6a/0x7e
[    7.068713]  [<ffffffff8105f074>] lock_acquire+0x5b/0x78
[    7.068713]  [<ffffffff81352a9a>] ? get_device_parent+0x98/0x1b0
[    7.068713]  [<ffffffff81560b72>] _raw_spin_lock+0x3c/0x6f
[    7.068713]  [<ffffffff81352a9a>] ? get_device_parent+0x98/0x1b0
[    7.068713]  [<ffffffff81352a9a>] get_device_parent+0x98/0x1b0
[    7.068713]  [<ffffffff8135312e>] device_add+0xf4/0x589
[    7.068713]  [<ffffffff81cff357>] ? drm_core_init+0xca/0xca
[    7.068713]  [<ffffffff8135ad4d>] ? pm_runtime_init+0xfa/0xfe
[    7.068713]  [<ffffffff81cff357>] ? drm_core_init+0xca/0xca
[    7.068713]  [<ffffffff813535d9>] device_register+0x16/0x1a
[    7.068713]  [<ffffffff81224acd>] drm_class_device_register+0x17/0x19
[    7.068713]  [<ffffffff81cff38e>] ttm_init+0x37/0x62
[    7.068713]  [<ffffffff81cdbbca>] do_one_initcall+0x78/0x131
[    7.068713]  [<ffffffff81cdbd77>] kernel_init+0xf4/0x178
[    7.068713]  [<ffffffff81cdb45d>] ? loglevel+0x31/0x31
[    7.068713]  [<ffffffff81562e94>] kernel_thread_helper+0x4/0x10
[    7.068713]  [<ffffffff81cdbc83>] ? do_one_initcall+0x131/0x131
[    7.068713]  [<ffffffff81562e90>] ? gs_change+0x13/0x13
[    7.068713] Code: 49 89 ff 41 89 f5 0f 85 fe 06 00 00 9c 58 66 66 90 66 90 f6 c4 02 0f 84 ee 06 00 00 e8 2b 00 0e 00 31 c0 e9 59 07 00 00 44 89 e8 <4d> 8b 64 c7 08 4d 85 e4 0f 85 04 03 00 00 83 3d 20 7c 18 01 00 
[    7.068713] RIP  [<ffffffff8105e55b>] __lock_acquire.isra.19+0x64/0x7c9
[    7.068713]  RSP <ffff88000006fd10>
[    7.068713] ---[ end trace 6e1803df9f758306 ]---
[    7.068713] Kernel panic - not syncing: Fatal exception

Thanks,
Fengguang

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