Messages in this thread | | | Date | Mon, 28 Jul 2008 11:15:33 -0300 | From | Glauber Costa <> | Subject | Re: [Bisected] Regression: Hang on boot in schedule_timeout_interruptible during ACPI init on SMP |
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On Sat, Jul 26, 2008 at 02:53:11PM -0400, Andrew Drake wrote: > I just discovered; the nolapic_timer parameter causes the problem to go > away entirely. It doesn't seem to have any nasty side effects, so I'm > content to use it. Looking at the dmesg logs, however, I notice that the > "last-good" kernel doesn't even try to use the LAPIC timer, but the > "first-bad" does. I wasn't able to track down any discernible reason. fine, but if you can still help us on this, it would be awesome ;-)
Actually, there is another nasty bug that depends, at least by a first impression, on the lapic timer. I'm planning to save a time today to look further on your problem. > > On a side note, that's the first I've ever heard/seen of that parameter, > I tried it because I noticed the problems started when the LAPIC timer > was successfully set up. I doubt the average user would notice this (you > can't even tell unless you pass apic=debug), so I doubt many others would > discover this fix/workaround. > > The question remains, though, why did it go from "don't try" to "try"?
Probably because the order of initialization of smp entities changed a bit during this series. Probably the lapic timer is now initialized a little bit earlier, before we have the chance to mark it as bad.
If you can send me at least your dmesgs and cpuinfo, it would be really really awesome.
> Thanks, > > Andrew >
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