You should also CC this to dri-deve I think (added).
On Sunday 24 May 2009, Miles Lane wrote:
> [ 38.564164] [ INFO: possible circular locking dependency detected ]
> [ 38.564167] 2.6.30-rc7 #2
> [ 38.564170] -------------------------------------------------------
> [ 38.564173] Xorg/3110 is trying to acquire lock:
> [ 38.564176] (&mm->mmap_sem){++++++}, at: [<ffffffff802a880c>]
> might_fault+0x64/0xb8
> [ 38.564188]
> [ 38.564189] but task is already holding lock:
> [ 38.564192] (&dev->mode_config.mutex){+.+.+.}, at:
> [<ffffffff804407af>] drm_mode_getresources+0x2f/0x54f
> [ 38.564203]
> [ 38.564204] which lock already depends on the new lock.
> [ 38.564205]
> [ 38.564208]
> [ 38.564208] the existing dependency chain (in reverse order) is:
> [ 38.564212]
> [ 38.564212] -> #3 (&dev->mode_config.mutex){+.+.+.}:
> [ 38.564219] [<ffffffff8025fabf>] __lock_acquire+0xa39/0xbc9
> [ 38.564226] [<ffffffff8025fd43>] lock_acquire+0xf4/0x118
> [ 38.564231] [<ffffffff8057e47a>] __mutex_lock_common+0x5a/0x40c
> [ 38.564239] [<ffffffff8057e8cc>] mutex_lock_nested+0x32/0x37
> [ 38.564244] [<ffffffff80459aee>] intelfb_pan_display+0x86/0xf7
> [ 38.564251] [<ffffffff803cf371>] fb_pan_display+0xca/0x111
> [ 38.564257] [<ffffffff803dc5d0>] bit_update_start+0x1b/0x44
> [ 38.564262] [<ffffffff803d993f>] fbcon_switch+0x3fb/0x400
> [ 38.564262] [<ffffffff80427c9a>] redraw_screen+0xc9/0x162
> [ 38.564262] [<ffffffff803daf0c>] fbcon_prepare_logo+0x24f/0x2e1
> [ 38.564262] [<ffffffff803db7de>] fbcon_init+0x36c/0x3fc
> [ 38.564262] [<ffffffff80426017>] visual_init+0x9a/0xd9
> [ 38.564262] [<ffffffff80427eb6>] bind_con_driver+0x183/0x2af
> [ 38.564262] [<ffffffff80428019>] take_over_console+0x37/0x44
> [ 38.564262] [<ffffffff803daff5>] fbcon_takeover+0x57/0x85
> [ 38.564262] [<ffffffff803dbf06>] fbcon_event_notify+0x319/0x677
> [ 38.564262] [<ffffffff80582763>] notifier_call_chain+0x63/0x97
> [ 38.564262] [<ffffffff80253aba>]
> __blocking_notifier_call_chain+0x4b/0x62
> [ 38.564262] [<ffffffff80253ae0>]
> blocking_notifier_call_chain+0xf/0x11
> [ 38.564262] [<ffffffff803cf06e>] fb_notifier_call_chain+0x16/0x18
> [ 38.564262] [<ffffffff803d1329>] register_framebuffer+0x22a/0x23f
> [ 38.564262] [<ffffffff8045a902>] intelfb_probe+0x4ef/0x573
> [ 38.564262] [<ffffffff8044410e>]
> drm_helper_initial_config+0x173/0x184
> [ 38.564262] [<ffffffff804499d4>] i915_driver_load+0x8c7/0x929
> [ 38.564262] [<ffffffff8043c68c>] drm_get_dev+0x381/0x485
> [ 38.564262] [<ffffffff80573b38>] i915_pci_probe+0x10/0x12
> [ 38.564262] [<ffffffff803c1757>] local_pci_probe+0x12/0x16
> [ 38.564262] [<ffffffff803c2456>] pci_device_probe+0x60/0x8f
> [ 38.564262] [<ffffffff804694a2>] driver_probe_device+0x9d/0x122
> [ 38.564262] [<ffffffff8046957f>] __driver_attach+0x58/0x7c
> [ 38.564262] [<ffffffff80468b90>] bus_for_each_dev+0x54/0x89
> [ 38.564262] [<ffffffff8046931b>] driver_attach+0x19/0x1b
> [ 38.564262] [<ffffffff80469017>] bus_add_driver+0xae/0x1e7
> [ 38.564262] [<ffffffff8046981f>] driver_register+0x98/0x105
> [ 38.564262] [<ffffffff803c268c>] __pci_register_driver+0x63/0xd3
> [ 38.564262] [<ffffffff80437ed8>] drm_init+0x68/0xce
> [ 38.564262] [<ffffffff807cafa0>] i915_init+0x4b/0x4d
> [ 38.564262] [<ffffffff8020906b>] do_one_initcall+0x65/0x153
> [ 38.564262] [<ffffffff807a765b>] kernel_init+0x14e/0x1a4
> [ 38.564262] [<ffffffff8020cd3a>] child_rip+0xa/0x20
> [ 38.564262] [<ffffffffffffffff>] 0xffffffffffffffff
> [ 38.564262]
> [ 38.564262] -> #2 ((fb_notifier_list).rwsem){.+.+.+}:
> [ 38.564262] [<ffffffff8025fabf>] __lock_acquire+0xa39/0xbc9
> [ 38.564262] [<ffffffff8025fd43>] lock_acquire+0xf4/0x118
> [ 38.564262] [<ffffffff8057ec02>] down_read+0x40/0x4f
> [ 38.564262] [<ffffffff80253aa3>]
> __blocking_notifier_call_chain+0x34/0x62
> [ 38.564262] [<ffffffff80253ae0>]
> blocking_notifier_call_chain+0xf/0x11
> [ 38.564262] [<ffffffff803cf06e>] fb_notifier_call_chain+0x16/0x18
> [ 38.564262] [<ffffffff803d1329>] register_framebuffer+0x22a/0x23f
> [ 38.564262] [<ffffffff8045a902>] intelfb_probe+0x4ef/0x573
> [ 38.564262] [<ffffffff8044410e>]
> drm_helper_initial_config+0x173/0x184
> [ 38.564262] [<ffffffff804499d4>] i915_driver_load+0x8c7/0x929
> [ 38.564262] [<ffffffff8043c68c>] drm_get_dev+0x381/0x485
> [ 38.564262] [<ffffffff80573b38>] i915_pci_probe+0x10/0x12
> [ 38.564262] [<ffffffff803c1757>] local_pci_probe+0x12/0x16
> [ 38.564262] [<ffffffff803c2456>] pci_device_probe+0x60/0x8f
> [ 38.564262] [<ffffffff804694a2>] driver_probe_device+0x9d/0x122
> [ 38.564262] [<ffffffff8046957f>] __driver_attach+0x58/0x7c
> [ 38.564262] [<ffffffff80468b90>] bus_for_each_dev+0x54/0x89
> [ 38.564262] [<ffffffff8046931b>] driver_attach+0x19/0x1b
> [ 38.564262] [<ffffffff80469017>] bus_add_driver+0xae/0x1e7
> [ 38.564262] [<ffffffff8046981f>] driver_register+0x98/0x105
> [ 38.564262] [<ffffffff803c268c>] __pci_register_driver+0x63/0xd3
> [ 38.564262] [<ffffffff80437ed8>] drm_init+0x68/0xce
> [ 38.564262] [<ffffffff807cafa0>] i915_init+0x4b/0x4d
> [ 38.564262] [<ffffffff8020906b>] do_one_initcall+0x65/0x153
> [ 38.564262] [<ffffffff807a765b>] kernel_init+0x14e/0x1a4
> [ 38.564262] [<ffffffff8020cd3a>] child_rip+0xa/0x20
> [ 38.564262] [<ffffffffffffffff>] 0xffffffffffffffff
> [ 38.564262]
> [ 38.564262] -> #1 (&fb_info->lock){+.+.+.}:
> [ 38.564262] [<ffffffff8025fabf>] __lock_acquire+0xa39/0xbc9
> [ 38.564262] [<ffffffff8025fd43>] lock_acquire+0xf4/0x118
> [ 38.564262] [<ffffffff8057e47a>] __mutex_lock_common+0x5a/0x40c
> [ 38.564262] [<ffffffff8057e8cc>] mutex_lock_nested+0x32/0x37
> [ 38.564262] [<ffffffff803cf624>] fb_mmap+0xa1/0x190
> [ 38.564262] [<ffffffff802aff81>] mmap_region+0x2a7/0x483
> [ 38.564262] [<ffffffff802b0454>] do_mmap_pgoff+0x2f7/0x35a
> [ 38.564262] [<ffffffff8020fb53>] sys_mmap+0x97/0xd8
> [ 38.564262] [<ffffffff8020bc2b>] system_call_fastpath+0x16/0x1b
> [ 38.564262] [<ffffffffffffffff>] 0xffffffffffffffff
> [ 38.564262]
> [ 38.564262] -> #0 (&mm->mmap_sem){++++++}:
> [ 38.564262] [<ffffffff8025f99c>] __lock_acquire+0x916/0xbc9
> [ 38.564262] [<ffffffff8025fd43>] lock_acquire+0xf4/0x118
> [ 38.564262] [<ffffffff802a8839>] might_fault+0x91/0xb8
> [ 38.564262] [<ffffffff80440a09>] drm_mode_getresources+0x289/0x54f
> [ 38.564262] [<ffffffff80438486>] drm_ioctl+0x21e/0x2ec
> [ 38.564262] [<ffffffff802cfed2>] vfs_ioctl+0x6a/0x82
> [ 38.564262] [<ffffffff802d034d>] do_vfs_ioctl+0x463/0x4a4
> [ 38.564262] [<ffffffff802d03df>] sys_ioctl+0x51/0x74
> [ 38.564262] [<ffffffff8020bc2b>] system_call_fastpath+0x16/0x1b
> [ 38.564262] [<ffffffffffffffff>] 0xffffffffffffffff
> [ 38.564262]
> [ 38.564262] other info that might help us debug this:
> [ 38.564262]
> [ 38.564262] 1 lock held by Xorg/3110:
> [ 38.564262] #0: (&dev->mode_config.mutex){+.+.+.}, at:
> [<ffffffff804407af>] drm_mode_getresources+0x2f/0x54f
> [ 38.564262]
> [ 38.564262] stack backtrace:
> [ 38.564262] Pid: 3110, comm: Xorg Not tainted 2.6.30-rc7 #2
> [ 38.564262] Call Trace:
> [ 38.564262] [<ffffffff8025ed21>] print_circular_bug_tail+0x71/0x7c
> [ 38.564262] [<ffffffff8025f99c>] __lock_acquire+0x916/0xbc9
> [ 38.564262] [<ffffffff802a880c>] ? might_fault+0x64/0xb8
> [ 38.564262] [<ffffffff8025fd43>] lock_acquire+0xf4/0x118
> [ 38.564262] [<ffffffff802a880c>] ? might_fault+0x64/0xb8
> [ 38.564262] [<ffffffff802a8839>] might_fault+0x91/0xb8
> [ 38.564262] [<ffffffff802a880c>] ? might_fault+0x64/0xb8
> [ 38.564262] [<ffffffff80440a09>] drm_mode_getresources+0x289/0x54f
> [ 38.564262] [<ffffffff803753ac>] ? __rcu_read_lock+0x0/0x3a
> [ 38.564262] [<ffffffff80440780>] ? drm_mode_getresources+0x0/0x54f
> [ 38.564262] [<ffffffff80438486>] drm_ioctl+0x21e/0x2ec
> [ 38.564262] [<ffffffff802cfed2>] vfs_ioctl+0x6a/0x82
> [ 38.564262] [<ffffffff802d034d>] do_vfs_ioctl+0x463/0x4a4
> [ 38.564262] [<ffffffff802d03df>] sys_ioctl+0x51/0x74
> [ 38.564262] [<ffffffff8020bc2b>] system_call_fastpath+0x16/0x1b
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