[ 1966.343286]
[ 1966.343288] =======================================================
[ 1966.356756] [ INFO: possible circular locking dependency detected ]
[ 1966.356759] 2.6.31-rc1-tip-00978-g99123e5-dirty #438
[ 1966.356761] -------------------------------------------------------
[ 1966.356764] events/0/387 is trying to acquire lock:
[ 1966.356766] (&kvm->lock){+.+.+.}, at: [<ffffffff8100af27>]
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356786]
[ 1966.356787] but task is already holding lock:
[ 1966.356789] (&match->interrupt_work){+.+...}, at:
[<ffffffff810986e9>] worker_thread+0x175/0x2f6
[ 1966.356797]
[ 1966.356798] which lock already depends on the new lock.
[ 1966.356799]
[ 1966.356800]
[ 1966.356801] the existing dependency chain (in reverse order) is:
[ 1966.356803]
[ 1966.356803] -> #1 (&match->interrupt_work){+.+...}:
[ 1966.356809] [<ffffffff810b3bf6>] __lock_acquire+0x1396/0x1710
[ 1966.356817] [<ffffffff810b403c>] lock_acquire+0xcc/0x104
[ 1966.356821] [<ffffffff810994a8>] __cancel_work_timer+0x121/0x247
[ 1966.356825] [<ffffffff8109962c>] cancel_work_sync+0x23/0x39
[ 1966.356828] [<ffffffff8100b280>] kvm_deassign_irq+0xf1/0x183
[ 1966.356832] [<ffffffff8100db6c>] kvm_vm_ioctl+0x8c8/0xc1a
[ 1966.356837] [<ffffffff81156e56>] vfs_ioctl+0x3e/0xa3
[ 1966.356846] [<ffffffff8115741c>] do_vfs_ioctl+0x4be/0x511
[ 1966.356850] [<ffffffff811574c5>] sys_ioctl+0x56/0x8d
[ 1966.356854] [<ffffffff81034fdb>] system_call_fastpath+0x16/0x1b
[ 1966.356860] [<ffffffffffffffff>] 0xffffffffffffffff
[ 1966.356869]
[ 1966.356870] -> #0 (&kvm->lock){+.+.+.}:
[ 1966.356872] [<ffffffff810b392b>] __lock_acquire+0x10cb/0x1710
[ 1966.356875] [<ffffffff810b403c>] lock_acquire+0xcc/0x104
[ 1966.356878] [<ffffffff81cde487>] mutex_lock_nested+0x75/0x2fa
[ 1966.356886] [<ffffffff8100af27>]
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356890] [<ffffffff81098743>] worker_thread+0x1cf/0x2f6
[ 1966.356892] [<ffffffff8109e335>] kthread+0xa8/0xb0
[ 1966.356899] [<ffffffff8103609a>] child_rip+0xa/0x20
[ 1966.356906] [<ffffffffffffffff>] 0xffffffffffffffff
[ 1966.356908]
[ 1966.356909] other info that might help us debug this:
[ 1966.356909]
[ 1966.356911] 2 locks held by events/0/387:
[ 1966.356913] #0: (events){+.+.+.}, at: [<ffffffff810986e9>]
worker_thread+0x175/0x2f6
[ 1966.356917] #1: (&match->interrupt_work){+.+...}, at:
[<ffffffff810986e9>] worker_thread+0x175/0x2f6
[ 1966.356922]
[ 1966.356923] stack backtrace:
[ 1966.356925] Pid: 387, comm: events/0 Not tainted
2.6.31-rc1-tip-00978-g99123e5-dirty #438
[ 1966.356928] Call Trace:
[ 1966.356932] [<ffffffff810b2362>] print_circular_bug_tail+0xd0/0xef
[ 1966.356935] [<ffffffff810b2232>] ? check_noncircular+0xec/0x14c
[ 1966.356939] [<ffffffff810b392b>] __lock_acquire+0x10cb/0x1710
[ 1966.356942] [<ffffffff8100af27>] ?
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356947] [<ffffffff810af6f7>] ? save_trace+0x4e/0xc2
[ 1966.356950] [<ffffffff810b2836>] ? check_irq_usage+0xc6/0xf0
[ 1966.356953] [<ffffffff8100af27>] ?
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356956] [<ffffffff810b403c>] lock_acquire+0xcc/0x104
[ 1966.356959] [<ffffffff8100af27>] ?
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356962] [<ffffffff810986e9>] ? worker_thread+0x175/0x2f6
[ 1966.356965] [<ffffffff81cde487>] mutex_lock_nested+0x75/0x2fa
[ 1966.356968] [<ffffffff8100af27>] ?
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356972] [<ffffffff8100af27>] ?
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356975] [<ffffffff810986e9>] ? worker_thread+0x175/0x2f6
[ 1966.356977] [<ffffffff810986e9>] ? worker_thread+0x175/0x2f6
[ 1966.356980] [<ffffffff810986e9>] ? worker_thread+0x175/0x2f6
[ 1966.356983] [<ffffffff8100af27>]
kvm_assigned_dev_interrupt_work_handler+0x42/0x13a
[ 1966.356986] [<ffffffff81098743>] worker_thread+0x1cf/0x2f6
[ 1966.356989] [<ffffffff810986e9>] ? worker_thread+0x175/0x2f6
[ 1966.356992] [<ffffffff8100aee5>] ?
kvm_assigned_dev_interrupt_work_handler+0x0/0x13a
[ 1966.356996] [<ffffffff8109e788>] ? autoremove_wake_function+0x0/0x63
[ 1966.356998] [<ffffffff81098574>] ? worker_thread+0x0/0x2f6
[ 1966.357001] [<ffffffff8109e335>] kthread+0xa8/0xb0
[ 1966.357005] [<ffffffff8103609a>] child_rip+0xa/0x20
[ 1966.357008] [<ffffffff81035a3c>] ? restore_args+0x0/0x30
[ 1966.357011] [<ffffffff8109e28d>] ? kthread+0x0/0xb0
[ 1966.357014] [<ffffffff81036090>] ? child_rip+0x0/0x20
[ 1966.600740] pci-stub 0000:83:00.0: irq 150 for MSI/MSI-X
[ 1966.601061] pci-stub 0000:83:00.0: irq 150 for MSI/MSI-X
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