Bug 452372 - INFO: hard-safe -> hard-unsafe lock order detected
Summary: INFO: hard-safe -> hard-unsafe lock order detected
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Dave Airlie
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-06-21 16:01 UTC by Tom London
Modified: 2008-10-19 02:05 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2008-10-19 02:05:44 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)
dmesg output (56.31 KB, text/plain)
2008-06-21 16:32 UTC, Tom London 		no flags Details
View All

Description Tom London 2008-06-21 16:01:30 UTC 
Description of problem:

Believe I got this trying "googleearth":

Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost
kernel:<4>======================================================
Jun 21 08:54:33 localhost kernel:<4>[ INFO: hard-safe -> hard-unsafe lock order
detected ]
Jun 21 08:54:33 localhost kernel:<4>2.6.26-0.74.rc6.git4.fc10.i686 #1
Jun 21 08:54:33 localhost
kernel:<4>------------------------------------------------------
Jun 21 08:54:33 localhost kernel:<4>swapper/0 [HC0[0]:SC1[2]:HE0:SE0] is trying
to acquire:
Jun 21 08:54:33 localhost kernel:<4> (&dev->lock.spinlock){-+..}, at:
[<f91b0e48>] drm_lock_take+0x20/0xb5 [drm]
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>and this task is already holding:
Jun 21 08:54:33 localhost kernel:<4> (&dev->tasklet_lock){++..}, at:
[<f91b0604>] drm_locked_tasklet_func+0x18/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4>which would create a new lock dependency:
Jun 21 08:54:33 localhost kernel:<4> (&dev->tasklet_lock){++..} ->
(&dev->lock.spinlock){-+..}
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>but this new dependency connects a
hard-irq-safe lock:
Jun 21 08:54:33 localhost kernel:<4> (&dev->tasklet_lock){++..}
Jun 21 08:54:33 localhost kernel:<4>... which became hard-irq-safe at:
Jun 21 08:54:33 localhost kernel:<4>  [<c0447cfc>] __lock_acquire+0x4a9/0xc18
Jun 21 08:54:33 localhost kernel:<4>  [<c04484d5>] lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>  [<c0645cad>] _spin_lock_irqsave+0x38/0x68
Jun 21 08:54:33 localhost kernel:<4>  [<f91b068f>] drm_locked_tasklet+0x2f/0x74
[drm]
Jun 21 08:54:33 localhost kernel:<4>  [<f91a302f>]
i915_driver_irq_handler+0x142/0x17b [i915]
Jun 21 08:54:33 localhost kernel:<4>  [<c0464cfc>] handle_IRQ_event+0x1a/0x4f
Jun 21 08:54:33 localhost kernel:<4>  [<c0465ca6>] handle_fasteoi_irq+0x7d/0xb6
Jun 21 08:54:33 localhost kernel:<4>  [<c0407073>] do_IRQ+0x98/0xc5
Jun 21 08:54:33 localhost kernel:<4>  [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>to a hard-irq-unsafe lock:
Jun 21 08:54:33 localhost kernel:<4> (&dev->lock.spinlock){-+..}
Jun 21 08:54:33 localhost kernel:<4>... which became hard-irq-unsafe at:
Jun 21 08:54:33 localhost kernel:<4>...  [<c0447d81>] __lock_acquire+0x52e/0xc18
Jun 21 08:54:33 localhost kernel:<4>  [<c04484d5>] lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>  [<c0645bf0>] _spin_lock_bh+0x21/0x4e
Jun 21 08:54:33 localhost kernel:<4>  [<f91b10b0>] drm_lock+0xe6/0x28a [drm]
Jun 21 08:54:33 localhost kernel:<4>  [<f91af3da>] drm_ioctl+0x1b0/0x228 [drm]
Jun 21 08:54:33 localhost kernel:<4>  [<c0497d28>] vfs_ioctl+0x50/0x69
Jun 21 08:54:33 localhost kernel:<4>  [<c0497f7a>] do_vfs_ioctl+0x239/0x24c
Jun 21 08:54:33 localhost kernel:<4>  [<c0497fcd>] sys_ioctl+0x40/0x5b
Jun 21 08:54:33 localhost kernel:<4>  [<c0404c4a>] syscall_call+0x7/0xb
Jun 21 08:54:33 localhost kernel:<4>  [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>other info that might help us debug this:
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>1 lock held by swapper/0:
Jun 21 08:54:33 localhost kernel:<4> #0:  (&dev->tasklet_lock){++..}, at:
[<f91b0604>] drm_locked_tasklet_func+0x18/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>the hard-irq-safe lock's dependencies:
Jun 21 08:54:33 localhost kernel:<4>-> (&dev->tasklet_lock){++..} ops: 0 {
Jun 21 08:54:33 localhost kernel:<4>   initial-use  at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447db7>]
__lock_acquire+0x564/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645cad>]
_spin_lock_irqsave+0x38/0x68
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b0f6e>]
drm_unlock+0x47/0xa3 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<f91af3da>]
drm_ioctl+0x1b0/0x228 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497d28>]
vfs_ioctl+0x50/0x69
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497f7a>]
do_vfs_ioctl+0x239/0x24c
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497fcd>]
sys_ioctl+0x40/0x5b
Jun 21 08:54:33 localhost kernel:<4>                        [<c0404c4a>]
syscall_call+0x7/0xb
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>   in-hardirq-W at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447cfc>]
__lock_acquire+0x4a9/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645cad>]
_spin_lock_irqsave+0x38/0x68
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b068f>]
drm_locked_tasklet+0x2f/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<f91a302f>]
i915_driver_irq_handler+0x142/0x17b [i915]
Jun 21 08:54:33 localhost kernel:<4>                        [<c0464cfc>]
handle_IRQ_event+0x1a/0x4f
Jun 21 08:54:33 localhost kernel:<4>                        [<c0465ca6>]
handle_fasteoi_irq+0x7d/0xb6
Jun 21 08:54:33 localhost kernel:<4>                        [<c0407073>]
do_IRQ+0x98/0xc5
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>   in-softirq-W at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447d20>]
__lock_acquire+0x4cd/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645cad>]
_spin_lock_irqsave+0x38/0x68
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b0604>]
drm_locked_tasklet_func+0x18/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<c042eb69>]
tasklet_hi_action+0x7f/0xec
Jun 21 08:54:33 localhost kernel:<4>                        [<c042f586>]
__do_softirq+0x84/0x10a
Jun 21 08:54:33 localhost kernel:<4>                        [<c0406f7a>]
do_softirq+0x79/0xda
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4> }
Jun 21 08:54:33 localhost kernel:<4> ... key      at: [<f91bc360>]
__key.24129+0x0/0xffff8205 [drm]
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>the hard-irq-unsafe lock's dependencies:
Jun 21 08:54:33 localhost kernel:<4>-> (&dev->lock.spinlock){-+..} ops: 0 {
Jun 21 08:54:33 localhost kernel:<4>   initial-use  at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447db7>]
__lock_acquire+0x564/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645bf0>]
_spin_lock_bh+0x21/0x4e
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b10b0>]
drm_lock+0xe6/0x28a [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<f91af3da>]
drm_ioctl+0x1b0/0x228 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497d28>]
vfs_ioctl+0x50/0x69
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497f7a>]
do_vfs_ioctl+0x239/0x24c
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497fcd>]
sys_ioctl+0x40/0x5b
Jun 21 08:54:33 localhost kernel:<4>                        [<c0404c4a>]
syscall_call+0x7/0xb
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>   in-softirq-W at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447d20>]
__lock_acquire+0x4cd/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645bf0>]
_spin_lock_bh+0x21/0x4e
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b0e48>]
drm_lock_take+0x20/0xb5 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b061f>]
drm_locked_tasklet_func+0x33/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<c042eb69>]
tasklet_hi_action+0x7f/0xec
Jun 21 08:54:33 localhost kernel:<4>                        [<c042f586>]
__do_softirq+0x84/0x10a
Jun 21 08:54:33 localhost kernel:<4>                        [<c0406f7a>]
do_softirq+0x79/0xda
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4>   hardirq-on-W at:
Jun 21 08:54:33 localhost kernel:<4>                        [<c0447d81>]
__lock_acquire+0x52e/0xc18
Jun 21 08:54:33 localhost kernel:<4>                        [<c04484d5>]
lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4>                        [<c0645bf0>]
_spin_lock_bh+0x21/0x4e
Jun 21 08:54:33 localhost kernel:<4>                        [<f91b10b0>]
drm_lock+0xe6/0x28a [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<f91af3da>]
drm_ioctl+0x1b0/0x228 [drm]
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497d28>]
vfs_ioctl+0x50/0x69
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497f7a>]
do_vfs_ioctl+0x239/0x24c
Jun 21 08:54:33 localhost kernel:<4>                        [<c0497fcd>]
sys_ioctl+0x40/0x5b
Jun 21 08:54:33 localhost kernel:<4>                        [<c0404c4a>]
syscall_call+0x7/0xb
Jun 21 08:54:33 localhost kernel:<4>                        [<ffffffff>] 0xffffffff
Jun 21 08:54:33 localhost kernel:<4> }
Jun 21 08:54:33 localhost kernel:<4> ... key      at: [<f91bc358>]
__key.24130+0x0/0xffff820d [drm]
Jun 21 08:54:33 localhost kernel:<4>
Jun 21 08:54:33 localhost kernel:<4>stack backtrace:
Jun 21 08:54:33 localhost kernel:<4>Pid: 0, comm: swapper Not tainted
2.6.26-0.74.rc6.git4.fc10.i686 #1
Jun 21 08:54:33 localhost kernel:<4> [<c0447842>] check_usage+0x1fa/0x20b
Jun 21 08:54:33 localhost kernel:<4> [<c044822d>] __lock_acquire+0x9da/0xc18
Jun 21 08:54:33 localhost kernel:<4> [<c04484d5>] lock_acquire+0x6a/0x90
Jun 21 08:54:33 localhost kernel:<4> [<f91b0e48>] ? drm_lock_take+0x20/0xb5 [drm]
Jun 21 08:54:33 localhost kernel:<4> [<c0645bf0>] _spin_lock_bh+0x21/0x4e
Jun 21 08:54:33 localhost kernel:<4> [<f91b0e48>] ? drm_lock_take+0x20/0xb5 [drm]
Jun 21 08:54:33 localhost kernel:<4> [<f91b0e48>] drm_lock_take+0x20/0xb5 [drm]
Jun 21 08:54:33 localhost kernel:<4> [<f91b061f>]
drm_locked_tasklet_func+0x33/0x74 [drm]
Jun 21 08:54:33 localhost kernel:<4> [<c042eb69>] tasklet_hi_action+0x7f/0xec
Jun 21 08:54:33 localhost kernel:<4> [<c042f586>] __do_softirq+0x84/0x10a
Jun 21 08:54:33 localhost kernel:<4> [<c0406f7a>] do_softirq+0x79/0xda
Jun 21 08:54:33 localhost kernel:<4> [<c0465c29>] ? handle_fasteoi_irq+0x0/0xb6
Jun 21 08:54:33 localhost kernel:<4> [<c042f0ec>] irq_exit+0x44/0x77
Jun 21 08:54:33 localhost kernel:<4> [<c0407087>] do_IRQ+0xac/0xc5
Jun 21 08:54:33 localhost kernel:<4> [<c0405686>] common_interrupt+0x2e/0x34
Jun 21 08:54:33 localhost kernel:<4> [<c04400d8>] ? sched_clock_init+0x73/0x8f
Jun 21 08:54:33 localhost kernel:<4> [<c0548eaa>] ?
acpi_idle_enter_simple+0x19e/0x20e
Jun 21 08:54:33 localhost kernel:<4> [<c052a742>] ? acpi_os_release_lock+0x8/0xa
Jun 21 08:54:33 localhost kernel:<4> [<c0548a83>] acpi_idle_enter_bm+0xbc/0x345
Jun 21 08:54:33 localhost kernel:<4> [<c043fa16>] ? pm_qos_requirement+0x26/0x2b
Jun 21 08:54:33 localhost kernel:<4> [<c05b79f8>] ? menu_select+0x5c/0x78
Jun 21 08:54:33 localhost kernel:<4> [<c05b6d9d>] cpuidle_idle_call+0x67/0x97
Jun 21 08:54:33 localhost kernel:<4> [<c05b6d36>] ? cpuidle_idle_call+0x0/0x97
Jun 21 08:54:33 localhost kernel:<4> [<c0403bf5>] cpu_idle+0xb8/0xd8
Jun 21 08:54:33 localhost kernel:<4> [<c0640dc9>] start_secondary+0x18d/0x195
Jun 21 08:54:33 localhost kernel:<4> =======================

Version-Release number of selected component (if applicable):
kernel-2.6.26-0.74.rc6.git4.fc10.i686

How reproducible:
Don't know

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:
Comment 1 Tom London 2008-06-21 16:32:33 UTC 
Created attachment 309970 [details]
dmesg output

I should mention:

Thinkpax X60, Intel 945 graphics, and I was running compiz.

Attaching complete output from dmesg.
Comment 2 Tom London 2008-07-07 14:45:08 UTC 
Continue to get this with kernel-2.6.26-0.107.rc8.git2.fc10.i686


======================================================
[ INFO: hard-safe -> hard-unsafe lock order detected ]
2.6.26-0.107.rc8.git2.fc10.i686 #1
------------------------------------------------------
googleearth-bin/7964 [HC0[0]:SC1[2]:HE0:SE0] is trying to acquire:
 (&dev->lock.spinlock){-+..}, at: [<f916ce50>] drm_lock_take+0x20/0xb5 [drm]

and this task is already holding:
 (&dev->tasklet_lock){++..}, at: [<f916c60c>] drm_locked_tasklet_func+0x18/0x74
[drm]
which would create a new lock dependency:
 (&dev->tasklet_lock){++..} -> (&dev->lock.spinlock){-+..}

but this new dependency connects a hard-irq-safe lock:
 (&dev->tasklet_lock){++..}
... which became hard-irq-safe at:
  [<c0447dfc>] __lock_acquire+0x4a9/0xc18
  [<c04485d5>] lock_acquire+0x6a/0x90
  [<c0668b15>] _spin_lock_irqsave+0x38/0x68
  [<f916c697>] drm_locked_tasklet+0x2f/0x74 [drm]
  [<f915519f>] i915_driver_irq_handler+0x142/0x17b [i915]
  [<c0464e54>] handle_IRQ_event+0x1a/0x4f
  [<c0465dfe>] handle_fasteoi_irq+0x7d/0xb6
  [<c040707b>] do_IRQ+0x98/0xc5
  [<ffffffff>] 0xffffffff

to a hard-irq-unsafe lock:
 (&dev->lock.spinlock){-+..}
... which became hard-irq-unsafe at:
...  [<c0447e81>] __lock_acquire+0x52e/0xc18
  [<c04485d5>] lock_acquire+0x6a/0x90
  [<c0668a58>] _spin_lock_bh+0x21/0x4e
  [<f916d0b8>] drm_lock+0xe6/0x28a [drm]
  [<f916b3e0>] drm_ioctl+0x1b6/0x22e [drm]
  [<c0497eac>] vfs_ioctl+0x50/0x69
  [<c04980fe>] do_vfs_ioctl+0x239/0x24c
  [<c0498151>] sys_ioctl+0x40/0x5b
  [<c0404c52>] syscall_call+0x7/0xb
  [<ffffffff>] 0xffffffff

other info that might help us debug this:

1 lock held by googleearth-bin/7964:
 #0:  (&dev->tasklet_lock){++..}, at: [<f916c60c>]
drm_locked_tasklet_func+0x18/0x74 [drm]

the hard-irq-safe lock's dependencies:
-> (&dev->tasklet_lock){++..} ops: 0 {
   initial-use  at:
                        [<c0447eb7>] __lock_acquire+0x564/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668b15>] _spin_lock_irqsave+0x38/0x68
                        [<f916cf76>] drm_unlock+0x47/0xa3 [drm]
                        [<f916b3e0>] drm_ioctl+0x1b6/0x22e [drm]
                        [<c0497eac>] vfs_ioctl+0x50/0x69
                        [<c04980fe>] do_vfs_ioctl+0x239/0x24c
                        [<c0498151>] sys_ioctl+0x40/0x5b
                        [<c0404c52>] syscall_call+0x7/0xb
                        [<ffffffff>] 0xffffffff
   in-hardirq-W at:
                        [<c0447dfc>] __lock_acquire+0x4a9/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668b15>] _spin_lock_irqsave+0x38/0x68
                        [<f916c697>] drm_locked_tasklet+0x2f/0x74 [drm]
                        [<f915519f>] i915_driver_irq_handler+0x142/0x17b [i915]
                        [<c0464e54>] handle_IRQ_event+0x1a/0x4f
                        [<c0465dfe>] handle_fasteoi_irq+0x7d/0xb6
                        [<c040707b>] do_IRQ+0x98/0xc5
                        [<ffffffff>] 0xffffffff
   in-softirq-W at:
                        [<c0447e20>] __lock_acquire+0x4cd/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668b15>] _spin_lock_irqsave+0x38/0x68
                        [<f916c697>] drm_locked_tasklet+0x2f/0x74 [drm]
                        [<f915519f>] i915_driver_irq_handler+0x142/0x17b [i915]
                        [<c0464e54>] handle_IRQ_event+0x1a/0x4f
                        [<c0465dfe>] handle_fasteoi_irq+0x7d/0xb6
                        [<c040707b>] do_IRQ+0x98/0xc5
                        [<ffffffff>] 0xffffffff
 }
 ... key      at: [<f9178360>] __key.24144+0x0/0xffff8211 [drm]

the hard-irq-unsafe lock's dependencies:
-> (&dev->lock.spinlock){-+..} ops: 0 {
   initial-use  at:
                        [<c0447eb7>] __lock_acquire+0x564/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668a58>] _spin_lock_bh+0x21/0x4e
                        [<f916d0b8>] drm_lock+0xe6/0x28a [drm]
                        [<f916b3e0>] drm_ioctl+0x1b6/0x22e [drm]
                        [<c0497eac>] vfs_ioctl+0x50/0x69
                        [<c04980fe>] do_vfs_ioctl+0x239/0x24c
                        [<c0498151>] sys_ioctl+0x40/0x5b
                        [<c0404c52>] syscall_call+0x7/0xb
                        [<ffffffff>] 0xffffffff
   in-softirq-W at:
                        [<c0447e20>] __lock_acquire+0x4cd/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668a58>] _spin_lock_bh+0x21/0x4e
                        [<f916ce50>] drm_lock_take+0x20/0xb5 [drm]
                        [<f916c627>] drm_locked_tasklet_func+0x33/0x74 [drm]
                        [<c042ec79>] tasklet_hi_action+0x7f/0xec
                        [<c042f696>] __do_softirq+0x84/0x10a
                        [<c0406f82>] do_softirq+0x79/0xda
                        [<ffffffff>] 0xffffffff
   hardirq-on-W at:
                        [<c0447e81>] __lock_acquire+0x52e/0xc18
                        [<c04485d5>] lock_acquire+0x6a/0x90
                        [<c0668a58>] _spin_lock_bh+0x21/0x4e
                        [<f916d0b8>] drm_lock+0xe6/0x28a [drm]
                        [<f916b3e0>] drm_ioctl+0x1b6/0x22e [drm]
                        [<c0497eac>] vfs_ioctl+0x50/0x69
                        [<c04980fe>] do_vfs_ioctl+0x239/0x24c
                        [<c0498151>] sys_ioctl+0x40/0x5b
                        [<c0404c52>] syscall_call+0x7/0xb
                        [<ffffffff>] 0xffffffff
 }
 ... key      at: [<f9178358>] __key.24145+0x0/0xffff8219 [drm]

stack backtrace:
Pid: 7964, comm: googleearth-bin Not tainted 2.6.26-0.107.rc8.git2.fc10.i686 #1
 [<c0447942>] check_usage+0x1fa/0x20b
 [<c044832d>] __lock_acquire+0x9da/0xc18
 [<c04485d5>] lock_acquire+0x6a/0x90
 [<f916ce50>] ? drm_lock_take+0x20/0xb5 [drm]
 [<c0668a58>] _spin_lock_bh+0x21/0x4e
 [<f916ce50>] ? drm_lock_take+0x20/0xb5 [drm]
 [<f916ce50>] drm_lock_take+0x20/0xb5 [drm]
 [<f916c627>] drm_locked_tasklet_func+0x33/0x74 [drm]
 [<c042ec79>] tasklet_hi_action+0x7f/0xec
 [<c042f696>] __do_softirq+0x84/0x10a
 [<c0406f82>] do_softirq+0x79/0xda
 [<c042f1fc>] irq_exit+0x44/0x77
 [<c04147ab>] smp_apic_timer_interrupt+0x6e/0x7c
 [<c040576f>] apic_timer_interrupt+0x33/0x38
 =======================
Comment 3 Tom London 2008-10-06 16:01:49 UTC 
Haven't seen this in ages......

Close?
Comment 4 John Poelstra 2008-10-19 02:05:44 UTC 
Please reopen if you see it again with latest kernel.  Thanks for the update
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