Re: i386 cpu hotplug bug - instant reboot when onlining secondary

[Zwane Mwaikambo <zwane@arm.linux.org.uk>]

On Sun, 19 Feb 2006, Nathan Lynch wrote:

> On a dual P3 Xeon machine, offlining and then onlining a cpu makes the
> box instantly reboot.  I've been seeing this throughout the 2.6.16-rc
> series, but wasn't able to collect more information until now.  Not
> sure when this last worked, unfortunately.
> 
> With the debugging patch below, I get this on serial console:

Does 2.6.14 work? Also i wonder if it gets out of the trampoline...

Index: linux-2.6.16-rc2/arch/i386/kernel/smpboot.c
===================================================================
RCS file: /home/cvsroot/linux-2.6.16-rc2/arch/i386/kernel/smpboot.c,v
retrieving revision 1.1.1.1
diff -u -p -B -r1.1.1.1 smpboot.c
--- linux-2.6.16-rc2/arch/i386/kernel/smpboot.c	11 Feb 2006 18:55:06 -0000	1.1.1.1
+++ linux-2.6.16-rc2/arch/i386/kernel/smpboot.c	21 Feb 2006 16:19:22 -0000
@@ -514,6 +514,7 @@ static void __devinit start_secondary(vo
 	cpu_init();
 	preempt_disable();
 	smp_callin();
+	Dprintk("startup_secondary\n");
 	while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
 		rep_nop();
 	setup_secondary_APIC_clock();
-
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