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Date: Mon, 09 Nov 2009 15:16:16 +0100 From: Mike Galbraith <efault@....de> To: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>, LKML <linux-kernel@...r.kernel.org>, pm list <linux-pm@...ts.linux-foundation.org>, Greg KH <gregkh@...e.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Jesse Barnes <jbarnes@...tuousgeek.org> Subject: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt_count leakage in keventd On Mon, 2009-11-09 at 15:02 +0100, Thomas Gleixner wrote: > On Mon, 9 Nov 2009, Ingo Molnar wrote: > > > > ok, then my observation should not apply. > > I think it _IS_ releated because the worker_thread is CPU affine and > the debug_smp_processor_id() check does: > > if (cpumask_equal(¤t->cpus_allowed, cpumask_of(this_cpu))) > > which prevents that usage of smp_processor_id() in ksoftirqd and > keventd in preempt enabled regions is warned on. > > We saw exaclty the same back trace with fd21073 (sched: Fix affinity > logic in select_task_rq_fair()). > > Rafael, can you please add a printk to debug_smp_processor_id() so we > can see on which CPU we are running ? I suspect we are on the wrong > one. I wonder if that's not intimately related to the problem I had, namely newidle balancing offline CPUs as they're coming up, making a mess of cpu enumeration. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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