Hi Andrew,

The 2.6.26-rc5-mm1 kernel panics while bootup on 32 way, x86_64 machine.
passing noapic as the command line parameter, boots up
the machine fine.

kernel BUG at arch/x86/kernel/io_apic_64.c:355!
invalid opcode: 0000 [1] SMP 
last sysfs file: 
CPU 24 
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.26-rc5-mm1-autotest #1
RIP: 0010:[<ffffffff8021b9da>]  [<ffffffff8021b9da>] add_pin_to_irq+0x7a/0x90
RSP: 0018:ffff81061e4cbb60  EFLAGS: 00010216
RAX: 00000000000000f0 RBX: 00000000000000f0 RCX: 0000000000000001
RDX: 0000000000000018 RSI: 0000000000000006 RDI: 00000000000000f0
RBP: 0000000000000006 R08: 0000000000000018 R09: 0000000000000006
R10: 0000000000000008 R11: ffffffff803948e6 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000018 R15: ffff81061e4cbc04
FS:  0000000000000000(0000) GS:ffff810bfe7be5c0(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 1, threadinfo ffff81061e4ca000, task ffff81032e4b96d0)
Stack:  0000000000000006 ffffffff8021ba6e 00000000000000f0 0000000000000001
 0000000000000000 0000000000000000 ffff81061e4cbc00 ffffffff80218991
 00000000000000f0 0000000000000000 0000000000000001 ffffffff80218a1a
Call Trace:
 [<ffffffff8021ba6e>] io_apic_set_pci_routing+0x7e/0xb0
 [<ffffffff80218991>] mp_register_gsi+0xb1/0xd0
 [<ffffffff80218a1a>] acpi_register_gsi+0x6a/0x70
 [<ffffffff80394b20>] acpi_pci_irq_enable+0x14f/0x220
 [<ffffffff803948e6>] acpi_pci_allocate_irq+0x0/0x4c
 [<ffffffff8036e14a>] do_pci_enable_device+0x4a/0x70
 [<ffffffff8036e1c1>] __pci_enable_device_flags+0x51/0x60
 [<ffffffff804f1608>] tg3_init_one+0x58/0x1640
 [<ffffffff80229790>] default_wake_function+0x0/0x10
 [<ffffffff8022e942>] set_cpus_allowed_ptr+0xc2/0xf0
 [<ffffffff803703b7>] pci_device_probe+0xe7/0x130
 [<ffffffff803c38b6>] driver_probe_device+0x96/0x1a0
 [<ffffffff803c3a49>] __driver_attach+0x89/0x90
 [<ffffffff803c39c0>] __driver_attach+0x0/0x90
 [<ffffffff803c2dbd>] bus_for_each_dev+0x4d/0x80
 [<ffffffff8028f708>] kmem_cache_alloc+0xc8/0xf0
 [<ffffffff803c341e>] bus_add_driver+0xae/0x220
 [<ffffffff803c3cd6>] driver_register+0x56/0x130
 [<ffffffff80370678>] __pci_register_driver+0x68/0xb0
 [<ffffffff806e5060>] tg3_init+0x0/0x20
 [<ffffffff806c8a63>] kernel_init+0x153/0x320
 [<ffffffff8020c378>] child_rip+0xa/0x12
 [<ffffffff806c8910>] kernel_init+0x0/0x320
 [<ffffffff8020c36e>] child_rip+0x0/0x12


Code: 89 05 27 88 43 00 7f 29 48 0f bf c1 48 8d 14 00 48 c1 e0 03 48 29 d0 48 8d 90 00 44 74 80 66 89 32 66 44 89 42 02 48 83 c4 08 c3 <0f> 0b eb fe 66 90 48 c7 c7 08 7d 5e 80 31 c0 e8 72 7b 01 00 66 
RIP  [<ffffffff8021b9da>] add_pin_to_irq+0x7a/0x90
 RSP <ffff81061e4cbb60>
---[ end trace 5a53b6247c28d358 ]---
Kernel panic - not syncing: Attempted to kill init!
Pid: 1, comm: swapper Tainted: G      D   2.6.26-rc5-mm1-autotest #1

Call Trace:
 [<ffffffff802335e6>] panic+0x86/0x170
 [<ffffffff8023434e>] printk+0x4e/0x60
 [<ffffffff80236d30>] do_exit+0x770/0x780
 [<ffffffff8020c817>] oops_end+0x87/0x90
 [<ffffffff8020ddf6>] do_invalid_op+0x86/0xa0
 [<ffffffff8021b9da>] add_pin_to_irq+0x7a/0x90
 [<ffffffff803ad7d4>] vt_console_print+0x224/0x2f0
 [<ffffffff80373f00>] dummycon_dummy+0x0/0x10
 [<ffffffff80500c09>] error_exit+0x0/0x51
 [<ffffffff803948e6>] acpi_pci_allocate_irq+0x0/0x4c
 [<ffffffff8021b9da>] add_pin_to_irq+0x7a/0x90
 [<ffffffff8021ba6e>] io_apic_set_pci_routing+0x7e/0xb0
 [<ffffffff80218991>] mp_register_gsi+0xb1/0xd0
 [<ffffffff80218a1a>] acpi_register_gsi+0x6a/0x70
 [<ffffffff80394b20>] acpi_pci_irq_enable+0x14f/0x220
 [<ffffffff803948e6>] acpi_pci_allocate_irq+0x0/0x4c
 [<ffffffff8036e14a>] do_pci_enable_device+0x4a/0x70
 [<ffffffff8036e1c1>] __pci_enable_device_flags+0x51/0x60
 [<ffffffff804f1608>] tg3_init_one+0x58/0x1640
 [<ffffffff80229790>] default_wake_function+0x0/0x10
 [<ffffffff8022e942>] set_cpus_allowed_ptr+0xc2/0xf0
 [<ffffffff803703b7>] pci_device_probe+0xe7/0x130
 [<ffffffff803c38b6>] driver_probe_device+0x96/0x1a0
 [<ffffffff803c3a49>] __driver_attach+0x89/0x90
 [<ffffffff803c39c0>] __driver_attach+0x0/0x90
 [<ffffffff803c2dbd>] bus_for_each_dev+0x4d/0x80
 [<ffffffff8028f708>] kmem_cache_alloc+0xc8/0xf0
 [<ffffffff803c341e>] bus_add_driver+0xae/0x220
 [<ffffffff803c3cd6>] driver_register+0x56/0x130
 [<ffffffff80370678>] __pci_register_driver+0x68/0xb0
 [<ffffffff806e5060>] tg3_init+0x0/0x20
 [<ffffffff806c8a63>] kernel_init+0x153/0x320
 [<ffffffff8020c378>] child_rip+0xa/0x12
 [<ffffffff806c8910>] kernel_init+0x0/0x320
 [<ffffffff8020c36e>] child_rip+0x0/0x12

-- 
Thanks & Regards,
Kamalesh Babulal,
Linux Technology Center,
IBM, ISTL.