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