On Tue, 2009-09-22 at 18:08 +0900, Tejun Heo wrote: > Can you please try the patch below? Also, please build the kernel > with debug info and ask gdb which line the crash corresponds to? > ie. l *pcpu_embed_first_chunk+0x1e2 Patch applied, no additional output visible: OAPIC[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:b0000000:30000000) NR_CPUS: 12 nr_cpumask_bits:12 nr_cpu_ids:12 nr_node_ids:2 PERCPU: Embedded 23 pages/cpu @ffff880028200000 s73688 r0 d20520 u26214 PANIC: early exception 06 rip 10:ffffffff81598250 error 0 cr2 d0fff6 Pid: 0, comm: swapper Not tainted 2.6.31-07068-g43c266-dirty #1 Call Trace: [] early_idt_handler+0x55/0x68 [] ? pcpu_setup_first_chunk+0x40b/0x703 [] ? pcpu_setup_first_chunk+0x427/0x703 [] pcpu_embed_first_chunk+0x1fd/0x261 [] ? pcpu_fc_alloc+0x0/0xac [] ? pcpu_fc_free+0x0/0x1f [] setup_per_cpu_areas+0x65/0x219 [] start_kernel+0x124/0x2c5 [] x86_64_start_reservations+0x82/0x86 [] x86_64_start_kernel+0xe4/0xeb RIP pcpu_setup_first_chunk+0x40d/0x703 gdb output: (gdb) l *pcpu_embed_first_chunk+0x1fd 0xffffffff81587a78 is in pcpu_embed_first_chunk (mm/percpu.c:1845). 1840 1841 pr_info("PERCPU: Embedded %zu pages/cpu @%p s%zu r%zu d%zu u%zu \n", 1842 PFN_DOWN(size_sum), base, ai->static_size, ai->reserved_size, 1843 ai->dyn_size, ai->unit_size); 1844 1845 rc = pcpu_setup_first_chunk(ai, base); 1846 goto out_free; 1847 1848 out_free_areas: 1849 for (group = 0; group < ai->nr_groups; group++) Regards, Tony V.