just noticed this on a build of Linus' tree from sometime yesterday.
Dave
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[ INFO: suspicious rcu_dereference_check() usage. ]
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kernel/sched_rt.c:1266 invoked rcu_dereference_check() without protection!
other info that might help us debug this:
rcu_scheduler_active = 1, debug_locks = 0
1 lock held by watchdog/0/12:
#0: (&rq->lock){-.-.-.}, at: [<ffffffff8104c460>] post_schedule.part.25+0x14/0x4a
stack backtrace:
Pid: 12, comm: watchdog/0 Not tainted 2.6.39+ #43
Call Trace:
[<ffffffff8108c376>] lockdep_rcu_dereference+0xa7/0xaf
[<ffffffff8104b7ee>] find_lowest_rq+0x11b/0x19a
[<ffffffff81055667>] push_rt_task.part.69+0x7b/0x1d2
[<ffffffff810558cc>] post_schedule_rt+0x1f/0x27
[<ffffffff8104c47c>] post_schedule.part.25+0x30/0x4a
[<ffffffff814c8ac9>] schedule+0x76e/0x7ca
[<ffffffff810bf0af>] ? watchdog_enable+0x194/0x194
[<ffffffff810bf0af>] ? watchdog_enable+0x194/0x194
[<ffffffff810bf122>] watchdog+0x73/0xb6
[<ffffffff810793e9>] kthread+0xa8/0xb0
[<ffffffff814ce230>] ? sub_preempt_count+0xa1/0xb4
[<ffffffff814d24a4>] kernel_thread_helper+0x4/0x10
[<ffffffff814cb698>] ? retint_restore_args+0x13/0x13
[<ffffffff81079341>] ? __init_kthread_worker+0x5a/0x5a
[<ffffffff814d24a0>] ? gs_change+0x13/0x13