Messages in this thread | | | Date | Tue, 5 Jun 2007 11:40:15 -0700 | From | "Siddha, Suresh B" <> | Subject | Re: Device hang when offlining a CPU due to IRQ misrouting |
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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@elm3a188:~# 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?
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