Sep  9 13:11:25 localhost kernel: [46891.942057] [ INFO: possible circular locking dependency detected ]
Sep  9 13:11:25 localhost kernel: [46891.942057] 2.6.31-rc9 #1
Sep  9 13:11:25 localhost kernel: [46891.942057] -------------------------------------------------------
Sep  9 13:11:25 localhost kernel: [46891.942057] links/16613 is trying to acquire lock:
Sep  9 13:11:25 localhost kernel: [46891.942057]  (&fb_info->lock){+.+.+.}, at: [<ffffffff813276a6>] fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] but task is already holding lock:
Sep  9 13:11:25 localhost kernel: [46891.942057]  (&mm->mmap_sem){++++++}, at: [<ffffffff810eab43>] sys_munmap+0x43/0x80
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] which lock already depends on the new lock.
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] the existing dependency chain (in reverse order) is:
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] -> #3 (&mm->mmap_sem){++++++}:
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810850dd>] __lock_acquire+0xe6d/0x11e0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810854ec>] lock_acquire+0x9c/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810e1ddf>] might_fault+0x8f/0xc0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813b87c2>] drm_mode_getresources+0x1a2/0x620
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813adfa4>] drm_ioctl+0x174/0x380
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff811198cc>] vfs_ioctl+0x7c/0xa0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81119a02>] do_vfs_ioctl+0x82/0x590
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81119f89>] sys_ioctl+0x79/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8100bf6b>] system_call_fastpath+0x16/0x1b
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffffffffffff>] 0xffffffffffffffff
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] -> #2 (&dev->mode_config.mutex){+.+.+.}:
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810850dd>] __lock_acquire+0xe6d/0x11e0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810854ec>] lock_acquire+0x9c/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81671089>] __mutex_lock_common+0x59/0x4c0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff816715cc>] mutex_lock_nested+0x3c/0x50
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813a6996>] drm_fb_helper_pan_display+0xc6/0x120
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8132761e>] fb_pan_display+0xee/0x150
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81337e75>] bit_update_start+0x25/0x60
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81335606>] fbcon_switch+0x466/0x480
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8138a166>] redraw_screen+0x156/0x220
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8138d0f6>] vc_do_resize+0x426/0x480
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8138d1ba>] vc_resize+0x1a/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813369ad>] fbcon_init+0x29d/0x520
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81389dec>] visual_init+0xec/0x150
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8138a3fd>] bind_con_driver+0x1cd/0x380
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8138a5f4>] take_over_console+0x44/0x60
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81333a02>] fbcon_takeover+0x52/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8133771b>] fbcon_event_notify+0x62b/0x660
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81074777>] notifier_call_chain+0x47/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81074b11>] __blocking_notifier_call_chain+0x51/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81074b41>] blocking_notifier_call_chain+0x11/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81327256>] fb_notifier_call_chain+0x16/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81328fe2>] register_framebuffer+0x232/0x340
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813a6dd9>] drm_fb_helper_single_fb_probe+0x2c9/0x380
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813f8720>] radeonfb_probe+0x10/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813a9026>] drm_helper_initial_config+0x36/0x60
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813f6075>] radeon_modeset_init+0x295/0x5c0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813df069>] radeon_device_init+0x439/0x630
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813dfbce>] radeon_driver_load_kms+0x9e/0x1b0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813b2ecf>] drm_get_dev+0x35f/0x5b0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81662f73>] radeon_pci_probe+0x10/0x12
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81309ba2>] local_pci_probe+0x12/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8130ac29>] pci_device_probe+0x109/0x110
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c370>] driver_probe_device+0x90/0x280
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c5f3>] __driver_attach+0x93/0xa0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142b658>] bus_for_each_dev+0x68/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c129>] driver_attach+0x19/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142bdd0>] bus_add_driver+0x1f0/0x320
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c8e8>] driver_register+0x78/0x140
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8130ae91>] __pci_register_driver+0x61/0xe0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813ada73>] drm_init+0x103/0x110
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81c7d991>] radeon_init+0xbf/0xc1
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81009047>] do_one_initcall+0x37/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81c53360>] kernel_init+0x14a/0x1a0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8100d0ba>] child_rip+0xa/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffffffffffff>] 0xffffffffffffffff
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] -> #1 ((fb_notifier_list).rwsem){.+.+.+}:
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810850dd>] __lock_acquire+0xe6d/0x11e0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810854ec>] lock_acquire+0x9c/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81671925>] down_read+0x45/0x80
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81074afa>] __blocking_notifier_call_chain+0x3a/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81074b41>] blocking_notifier_call_chain+0x11/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81327256>] fb_notifier_call_chain+0x16/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81328fe2>] register_framebuffer+0x232/0x340
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813a6dd9>] drm_fb_helper_single_fb_probe+0x2c9/0x380
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813f8720>] radeonfb_probe+0x10/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813a9026>] drm_helper_initial_config+0x36/0x60
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813f6075>] radeon_modeset_init+0x295/0x5c0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813df069>] radeon_device_init+0x439/0x630
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813dfbce>] radeon_driver_load_kms+0x9e/0x1b0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813b2ecf>] drm_get_dev+0x35f/0x5b0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81662f73>] radeon_pci_probe+0x10/0x12
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81309ba2>] local_pci_probe+0x12/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8130ac29>] pci_device_probe+0x109/0x110
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c370>] driver_probe_device+0x90/0x280
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c5f3>] __driver_attach+0x93/0xa0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142b658>] bus_for_each_dev+0x68/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c129>] driver_attach+0x19/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142bdd0>] bus_add_driver+0x1f0/0x320
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8142c8e8>] driver_register+0x78/0x140
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8130ae91>] __pci_register_driver+0x61/0xe0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813ada73>] drm_init+0x103/0x110
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81c7d991>] radeon_init+0xbf/0xc1
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81009047>] do_one_initcall+0x37/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81c53360>] kernel_init+0x14a/0x1a0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8100d0ba>] child_rip+0xa/0x20
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffffffffffff>] 0xffffffffffffffff
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] -> #0 (&fb_info->lock){+.+.+.}:
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81085165>] __lock_acquire+0xef5/0x11e0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810854ec>] lock_acquire+0x9c/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff81671089>] __mutex_lock_common+0x59/0x4c0
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff816715cc>] mutex_lock_nested+0x3c/0x50
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff813276a6>] fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8110c33c>] __fput+0xfc/0x220
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8110c47d>] fput+0x1d/0x30
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810e8bea>] remove_vma+0x4a/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810eaa6f>] do_munmap+0x2bf/0x350
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff810eab51>] sys_munmap+0x51/0x80
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffff8100bf6b>] system_call_fastpath+0x16/0x1b
Sep  9 13:11:25 localhost kernel: [46891.942057]        [<ffffffffffffffff>] 0xffffffffffffffff
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] other info that might help us debug this:
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] 1 lock held by links/16613:
Sep  9 13:11:25 localhost kernel: [46891.942057]  #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810eab43>] sys_munmap+0x43/0x80
Sep  9 13:11:25 localhost kernel: [46891.942057] 
Sep  9 13:11:25 localhost kernel: [46891.942057] stack backtrace:
Sep  9 13:11:25 localhost kernel: [46891.942057] Pid: 16613, comm: links Tainted: G         C 2.6.31-rc9 #1
Sep  9 13:11:25 localhost kernel: [46891.942057] Call Trace:
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff81082e4c>] print_circular_bug_tail+0xac/0x100
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff81085165>] __lock_acquire+0xef5/0x11e0
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff810854ec>] lock_acquire+0x9c/0x190
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff813276a6>] ? fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff81671089>] __mutex_lock_common+0x59/0x4c0
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff813276a6>] ? fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff813276a6>] ? fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff816715cc>] mutex_lock_nested+0x3c/0x50
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff813276a6>] fb_release+0x26/0x70
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff8110c33c>] __fput+0xfc/0x220
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff8110c47d>] fput+0x1d/0x30
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff810e8bea>] remove_vma+0x4a/0x90
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff810eaa6f>] do_munmap+0x2bf/0x350
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff810eab51>] sys_munmap+0x51/0x80
Sep  9 13:11:25 localhost kernel: [46891.942057]  [<ffffffff8100bf6b>] system_call_fastpath+0x16/0x1b