2.6.28-rc4: inconsistent lock state durin s2ram

[Matt Mackall]

Just noticed this while looking to see if my iwlagn regression was still
around (doesn't seem to be):

[112342.899610] SMP alternatives: switching to UP code
[112343.045933] 
[112343.045935] =================================
[112343.045937] [ INFO: inconsistent lock state ]
[112343.045941] 2.6.28-rc4 #40
[112343.045943] ---------------------------------
[112343.045945] inconsistent {in-hardirq-W} -> {hardirq-on-W} usage.
[112343.045949] ksoftirqd/0/4 [HC0[0]:SC1[1]:HE1:SE0] takes:
[112343.045951]  (&rq->lock){++..}, at: [<ffffffff802493f5>]
sched_rt_period_timer+0xb9/0x1c7
[112343.045961] {in-hardirq-W} state was registered at:
[112343.045963]   [<ffffffffffffffff>] 0xffffffffffffffff
[112343.045969] irq event stamp: 4112884
[112343.045972] hardirqs last  enabled at (4112884):
[<ffffffff804ed8ca>] _spin_unlock_irq+0x24/0x2e
[112343.045978] hardirqs last disabled at (4112883):
[<ffffffff804eda92>] _spin_lock_irq+0x15/0x41
[112343.045983] softirqs last  enabled at (4112876):
[<ffffffff8022674c>] call_softirq+0x1c/0x28
[112343.045989] softirqs last disabled at (4112881):
[<ffffffff8022674c>] call_softirq+0x1c/0x28
[112343.045994] 
[112343.045995] other info that might help us debug this:
[112343.045997] no locks held by ksoftirqd/0/4.
[112343.045999] 
[112343.046000] stack backtrace:
[112343.046003] Pid: 4, comm: ksoftirqd/0 Not tainted 2.6.28-rc4 #40
[112343.046006] Call Trace:
[112343.046008]  <IRQ>  [<ffffffff8026e41f>] print_usage_bug+0x1a3/0x1b2
[112343.046019]  [<ffffffff8022f1dd>] save_stack_trace+0x22/0x3e
[112343.046023]  [<ffffffff8026ee45>] mark_lock+0x5a9/0x91f
[112343.046028]  [<ffffffff80270369>] __lock_acquire+0x6c2/0x14b2
[112343.046032]  [<ffffffff802711e6>] lock_acquire+0x8d/0xba
[112343.046037]  [<ffffffff802493f5>] sched_rt_period_timer+0xb9/0x1c7
[112343.046041]  [<ffffffff804eda37>] _spin_lock+0x29/0x36
[112343.046045]  [<ffffffff802493f5>] sched_rt_period_timer+0xb9/0x1c7
[112343.046050]  [<ffffffff80355db7>] __next_cpu+0x19/0x26
[112343.046054]  [<ffffffff802493f5>] sched_rt_period_timer+0xb9/0x1c7
[112343.046058]  [<ffffffff804ed8ca>] _spin_unlock_irq+0x24/0x2e
[112343.046063]  [<ffffffff8024933c>] sched_rt_period_timer+0x0/0x1c7
[112343.046068]  [<ffffffff80264c82>] run_hrtimer_pending+0x61/0x10b
[112343.046073]  [<ffffffff80254c83>] __do_softirq+0x8e/0x163
[112343.046077]  [<ffffffff8022674c>] call_softirq+0x1c/0x28
[112343.046079]  <EOI>  [<ffffffff80227db5>] do_softirq+0x45/0xa5
[112343.046086]  [<ffffffff8025452f>] ksoftirqd+0x56/0xcc
[112343.046090]  [<ffffffff802544d9>] ksoftirqd+0x0/0xcc
[112343.046095]  [<ffffffff8026257e>] kthread+0x47/0x73
[112343.046101]  [<ffffffff804ed511>] trace_hardirqs_on_thunk+0x3a/0x3f
[112343.046105]  [<ffffffff80226259>] child_rip+0xa/0x11
[112343.046109]  [<ffffffff80225463>] restore_args+0x0/0x30
[112343.046114]  [<ffffffff80262512>] kthreadd+0x187/0x1ac
[112343.046118]  [<ffffffff80262537>] kthread+0x0/0x73
[112343.046122]  [<ffffffff8022624f>] child_rip+0x0/0x11

-- 
Mathematics is the supreme nostalgia of our time.

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