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From: John Baldwin <jhb@FreeBSD.org>
To: freebsd-smp@FreeBSD.org
Date: Thu, 12 May 2005 16:40:38 -0400
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cc: smp@FreeBSD.org
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cc: Kris Kennaway <kris@obsecurity.org>
Subject: Re: 'panic: spin lock held too long' at boot
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On Friday 06 May 2005 11:44 am, Kris Kennaway wrote:
> The following has happened twice recently while booting 6.0 on a
> 12-processor e4500:
>
> [...]
> Waiting 8 seconds for SCSI devices to settle
> SMP: AP CPU #11 Launched!
> SMP: AP CPU #10 Launched!
> SMP: AP CPU #9 Launched!
> SMP: AP CPU #8 Launched!
> SMP: AP CPU #7 Launched!
> SMP: AP CPU #6 Launched!
> SMP: AP CPU #5 Launched!
> SMP: AP CPU #4 Launched!
> SMP: AP CPU #3 Launched!
> SMP: AP CPU #2 Launched!
> SMP: AP CPU #1 Launched!
> panic: spin lock held too long0xffffff813e774730 foor >5 seecons
> cpuid = 11
> KDB: enter: panic
> [hangs]
>
> Any ideas?

Could be related to how the idle loop is coded.  Try hacking on it so that it 
does a try lock of sched_lock and only calls mi_switch() if it succeeds, 
otherwise loop around and call sched_runnable() again.

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org