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Subject: Re: 2.6.24-rc7-rt1
From: Mike Galbraith <efault@gmx.de>
To: Gregory Haskins <ghaskins@novell.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Mariusz Kozlowski <m.kozlowski@tuxland.pl>,
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       RT <linux-rt-users@vger.kernel.org>
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debug resume trace

static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
{
	int first;

	/* "this_cpu" is cheaper to preempt than a remote processor */
	if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
		return this_cpu;

	first = first_cpu(*mask);
	if (first != NR_CPUS) {
		if (!cpu_online(first)) {
			WARN_ON_ONCE(1);
			return -1;
		}
		return first;
	}

	return -1;
}

[  156.344352] CPU1 is down
[    3.726557] Intel machine check architecture supported.
[    3.726565] Intel machine check reporting enabled on CPU#0.
[    3.726567] CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
[    3.726570] CPU0: Thermal monitoring enabled
[    3.726576] Back to C!
[    3.727107] Force enabled HPET at resume
[    3.727193] Enabling non-boot CPUs ...
[    3.727446] CPU0 attaching NULL sched-domain.
[    3.727550] WARNING: at kernel/sched_rt.c:385 pick_optimal_cpu()
[    3.727553] Pid: 27, comm: events/0 Not tainted 2.6.24-rt2-smp #73
[    3.727556]  [<b010522a>] show_trace_log_lvl+0x1a/0x30
[    3.727564]  [<b0105ccd>] show_trace+0x12/0x14
[    3.727567]  [<b010641f>] dump_stack+0x6c/0x72
[    3.727569]  [<b0120b0f>] find_lowest_rq+0x199/0x1af
[    3.727573]  [<b0120beb>] push_rt_task+0x6e/0x1ed
[    3.727575]  [<b01276a3>] switched_to_rt+0x39/0x55
[    3.727579]  [<b0128cd1>] task_setprio+0xbf/0x18f
[    3.727581]  [<b014c21e>] __rt_mutex_adjust_prio+0x19/0x1c
[    3.727585]  [<b014c943>] task_blocks_on_rt_mutex+0x14e/0x17e
[    3.727588]  [<b02f2e18>] rt_spin_lock_slowlock+0xed/0x16a
[    3.727593]  [<b02f351a>] __rt_spin_lock+0x41/0x48
[    3.727596]  [<b02f3529>] rt_spin_lock+0x8/0xa
[    3.727598]  [<b013f2c2>] finish_wait+0x25/0x49
[    3.727602]  [<b013c746>] worker_thread+0x64/0xe1
[    3.727605]  [<b013efb2>] kthread+0x39/0x5b
[    3.727607]  [<b0104e83>] kernel_thread_helper+0x7/0x14
[    3.727610]  =======================
[    3.727624] SMP alternatives: switching to SMP code
[    3.728314] Booting processor 1/1 eip 3000


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