BUG: MAX_LOCK_DEPTH too low!

[Kirill A. Shutemov]

Hi,

I've got this BUG on up-to-date Linus tree (aed606e):

[ 1145.439071] BUG: MAX_LOCK_DEPTH too low!
[ 1145.439077] turning off the locking correctness validator.
[ 1145.439081] Pid: 4619, comm: kvm Not tainted 3.7.0-08682-gaed606e-dirty #166
[ 1145.439084] Call Trace:
[ 1145.439094]  [<ffffffff810e6094>] __lock_acquire.isra.24+0xc54/0xe10
[ 1145.439099]  [<ffffffff810e6873>] lock_acquire+0x93/0x140
[ 1145.439106]  [<ffffffff8117bfa8>] ? mm_take_all_locks+0x148/0x1b0
[ 1145.439111]  [<ffffffff8173d239>] down_write+0x49/0x90
[ 1145.439115]  [<ffffffff8117bfa8>] ? mm_take_all_locks+0x148/0x1b0
[ 1145.439119]  [<ffffffff8117bfa8>] mm_take_all_locks+0x148/0x1b0
[ 1145.439124]  [<ffffffff81192253>] ? do_mmu_notifier_register+0x153/0x180
[ 1145.439128]  [<ffffffff8119217f>] do_mmu_notifier_register+0x7f/0x180
[ 1145.439132]  [<ffffffff811922b3>] mmu_notifier_register+0x13/0x20
[ 1145.439138]  [<ffffffff81006036>] kvm_dev_ioctl+0x3e6/0x520
[ 1145.439142]  [<ffffffff810e40e8>] ? debug_check_no_locks_freed+0xd8/0x170
[ 1145.439148]  [<ffffffff811be6c7>] do_vfs_ioctl+0x97/0x540
[ 1145.439152]  [<ffffffff811bec01>] sys_ioctl+0x91/0xb0
[ 1145.439158]  [<ffffffff8132464e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 1145.439163]  [<ffffffff817478c6>] system_call_fastpath+0x1a/0x1f

-- 
 Kirill A. Shutemov
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