Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00

From: Ingo Molnar
Date: Fri Jun 17 2005 - 06:20:40 EST

* Ingo Molnar <mingo@xxxxxxx> wrote:

> > There doesn't seem to be any actual lockups, just messages. I will try
> > disabling the above when I get home this evening. Can't get to the
> > system right now.
> i tweaked the softlockup detector in the last patch a bit (to fix
> false positives under very high loads), might have broken it on SMP.

yeah - found a bug that could explain the symptoms on your system.
Called softlockup_tick() from the global timer interrupt, instead of the
per-CPU timer interrupt. So on SMP the other CPUs would not see any
softlockup ticks at all, and would incorrectly report soft lockups.
This bug is fixed in the -48-36 patch i just uploaded.

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