fifo panic (was: Re: Panic when building the world under SMP kernel (HTT).)

Robert Watson rwatson at
Fri Sep 9 14:01:36 PDT 2005

On Fri, 9 Sep 2005, Julien Gabel wrote:

> Just to report that i always encountered a panic when building the world 
> using an SMP kernel for a CPU with HTT enable (in the BIOS) and the 
> sysctl machdep.hlt_logical_cpus set to 0.
> Just cvsup'ed (kernel built at Fri Sep 9 18:39:41 CEST 2005).
> See the kernel trace and kernel configuration file attached, please.

Do you have a crash dump for this crash, and a kernel with debugging 
symbols?  There have been occasional fifo panic reports from SMP boxes 
(especially >=4 CPUs doing builds), and I'd like to try to track it down, 
but based on prior experience, we'll need some amount of detailed 
debugging information to get much further.


Robert N M Watson

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