BUG: warning at kernel/lockdep.c:2427/check_flags()

After some hours running 2.6.17-rc6-mm1 + combo-patch I've got this:

[12138.880686] BUG: warning at kernel/lockdep.c:2427/check_flags()
[12138.880692]
[12138.880693] Call Trace:
[12138.880702]  [<ffffffff80240374>] check_flags+0x86/0x201
[12138.880707]  [<ffffffff80240873>] lock_acquire+0x2f/0xa3
[12138.880713]  [<ffffffff8025fcae>] sys_munmap+0x5e/0xa7
[12138.880719]  [<ffffffff8020944e>] system_call+0x7e/0x83
[12138.880723]
[12138.880725] irq event stamp: 18146
[12138.880728] hardirqs last  enabled at (18145): [<ffffffff8049dffc>] _spin_unlock_irq+0x28/0x50
[12138.880734] hardirqs last disabled at (18146): [<ffffffff8049d61e>] trace_hardirqs_off_thunk+0x35/0x67
[12138.880742] softirqs last  enabled at (18112): [<ffffffff8022c1ae>] __do_softirq+0xb2/0xba
[12138.880748] softirqs last disabled at (18105): [<ffffffff8020a2c2>] call_softirq+0x1e/0x28


I don't know if/how it is reproducible.

-- 
	Paolo Ornati
	Linux 2.6.17-rc6-mm1-lockdep on x86_64
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