On Mon, 2009-09-21 at 12:26 -0700, H. Peter Anvin wrote:
> Could you please do a git bisect on this problem?

On Mon, 2009-09-21 at 21:36 +0200, Ingo Molnar wrote:
> strip the leading g. (which stands for Git)

Thanks Ingo. 11-step bisection reveals:

chainsaw@prometheus /cvs/linux-2.6 $ git bisect bad
fd1e8a1fe2b54df6c185b4fa65f181f50b9c4d4e is the first bad commit
commit fd1e8a1fe2b54df6c185b4fa65f181f50b9c4d4e
Author: Tejun Heo <tj@kernel.org>
Date:   Fri Aug 14 15:00:51 2009 +0900

    percpu: introduce pcpu_alloc_info and pcpu_group_info

I will repeat the early exception here:
IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: INT_SRC_OVR (bus 0 bus_irq 14 global_irq 14 high edge)
ACPI: INT_SRC_OVR (bus 0 bus_irq 15 global_irq 15 high edge)
Using ACPI (MADT) for SMP configuration information
ACPI: HPET id: 0x10de8201 base: 0xfed00000
SMP: allowing 12 CPUs, 0 hotplug CPUs
Allocating PCI resources starting at b00000000 (gap:b00000000:3000000
NR_CPUS: 12 nr_cpumask_bits:12 nr_cpu_ids:12 nr_node_ids:2
PERCPU: Embedded 23 pages/cpu @ffff880028200000 s73688 r0 d20520 u262
PANIC: early exception 06 rip 10:ffffffff815a50e6 error 0 cr2 d0fff6
Pid: 0, comm: swapper Not tained 2.6.31-07068-g43c266 #1
Call Trace:
[<ffffffff81591175>] early_idt_handler+0x55/0x68
[<ffffffff815a50e6>] ? pcpu_setup_first_chunk+0x40b/0x692
[<ffffffff815a50ff>] ? pcpu_setup_first_chunk+0x424/0x692
[<ffffffff815a5867>] pcpu_embed_first_chunk+0x1e2/0x241
[<ffffffff81598c14>] ? pcpu_fc_alloc+0x0/0xac
[<ffffffff81598bf5>] ? pcpu_fc_free+0x0/0x1f
[<ffffffff81598a36>] setup_per_cpu_areas+0x65/0x219
[<ffffffff815919bf>] start_kernel+0x124/0x2c5
[<ffffffff81591252>] x86_64_start_reservations+0x82/0x86
[<ffffffff8159133a>] x86_64_start_kernel+0xe4/0xeb
RIP pcpu_setup_first_chunk+0x40b/0x692

Config attached.

Regards,
Tony V.