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Date: Tue, 5 Jun 2007 11:40:15 -0700 From: "Siddha, Suresh B" <suresh.b.siddha@...el.com> To: "Darrick J. Wong" <djwong@...ibm.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@...el.com>, linux-kernel@...r.kernel.org, ebiederm@...ssion.com Subject: Re: Device hang when offlining a CPU due to IRQ misrouting On Tue, Jun 05, 2007 at 11:33:01AM -0700, Darrick J. Wong wrote: > On Tue, Jun 05, 2007 at 11:13:42AM -0700, Siddha, Suresh B wrote: > > I see. Your system should have 4 or 8 logical cpu's right. So you must be > > using logical flat mode, right? > > I believe so. The system has two Xeon 5150s with an Intel 5000 chipset > of some sort. > > > When this bug happens, what does /proc/irq/<irq-no>/smp_affinity show? > > root@...3a188:~# cat /proc/irq/114/smp_affinity > 02 Ok. What this shows is that fixup_irqs() failed to move the irq properly. Ideally we should see cpu_online_map here (i.e., 0xfd). So most likely __assign_irq_vector() failed for some reason and I am puzzled for the reason... Does this problem happen only under certain stress or something simple, like boot the kernel echo 2 > /proc/irq/114/smp_affinity wait for irq to hit the cpu1. echo 0 > /sys/devices/system/cpu/cpu1/online will immmd trigger this? thanks, suresh - 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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