linux-kernel - Re: 2.6.24-rc7-rt1

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Date:	Tue, 15 Jan 2008 11:50:48 -0500
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Mike Galbraith" <efault@....de>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Mariusz Kozlowski" <m.kozlowski@...land.pl>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"RT" <linux-rt-users@...r.kernel.org>
Subject: Re: 2.6.24-rc7-rt1

>>> On Tue, Jan 15, 2008 at  4:28 AM, in message
<1200389315.4130.3.camel@...er.simson.net>, Mike Galbraith <efault@....de>
wrote: 

> 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

This gives me a much better hint, Mike.  Thanks!

-Greg

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