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SubjectRe: 2.6.28-rc6: early panic with boot option "nosmp"
On Thu, Dec 04, 2008 at 12:13:43PM +0200, Andi Kleen wrote:
> On Thu, Dec 04, 2008 at 10:28:06AM +0800, Wu Fengguang wrote:
> > Hi,
> >
> > The boot option "maxcpus=0" or "nosmp" makes kernel 2.6.28-rc6 panic
> > immediately after booting:
> >
> > PANIC: early exception 0e rip 10:ffffffff8176d6ff error 0 cr2 9
>
> It would be useful if you could look the ffffffff8176d6ff
> address up in your System.map or using gdb.

addr2line -e vmlinux -f 0xffffffff8176d6ff
__get_smp_config
/cc/linux-2.6/arch/x86/kernel/mpparse.c:607


582 /*
583 * Scan the memory blocks for an SMP configuration block.
584 */
585 static void __init __get_smp_config(unsigned int early)
586 {
587 struct intel_mp_floating *mpf = mpf_found;
588
589 if (x86_quirks->mach_get_smp_config) {
590 if (x86_quirks->mach_get_smp_config(early))
591 return;
592 }
593 if (acpi_lapic && early)
594 return;
595 /*
596 * ACPI supports both logical (e.g. Hyper-Threading) and physical
597 * processors, where MPS only supports physical.
598 */
599 if (acpi_lapic && acpi_ioapic) {
600 printk(KERN_INFO "Using ACPI (MADT) for SMP configuration "
601 "information\n");
602 return;
603 } else if (acpi_lapic)
604 printk(KERN_INFO "Using ACPI for processor (LAPIC) "
605 "configuration information\n");
606
607 printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n",
608 mpf->mpf_specification);

The exception raised on dereferencing mpf or mpf_found.

Thanks,
Fengguang


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