Ubuntu 10.04 Maverick with linux-image-2.6.35-32-generic crash (8 -> 7
vCPUs)

[  150.864022] Cannot set affinity for irq 0
[  150.864040] Broke affinity for irq 42
[  150.864042] Broke affinity for irq 43
[  150.864044] Broke affinity for irq 44
[  150.864046] Broke affinity for irq 45
[  150.864048] Broke affinity for irq 46
[  150.864050] Broke affinity for irq 47
[  150.865076] ------------[ cut here ]------------
[  150.865102] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.865110] invalid opcode: 0000 [#1] SMP 
[  150.865118] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.865126] CPU 1 
[  150.865129] Modules linked in: lp parport xen_blkfront xen_netfront
[  150.865143] 
[  150.865148] Pid: 6, comm: migration/1 Not tainted 2.6.35-32-generic 
#67-Ubuntu /
[  150.865157] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] 
dummy_handler+0x4/0x10
[  150.865173] RSP: e02b:ffff880003e89ea8  EFLAGS: 00010046
[  150.865179] RAX: ffffffffff57b000 RBX: ffff88003fc0c2a0 RCX: 0000000000000000
[  150.865188] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 0000000000000007
[  150.865196] RBP: ffff880003e89ea8 R08: 0000000000000200 R09: 0000000000000000
[  150.865204] R10: ffff880003e91028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.865212] R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000100
[  150.865225] FS:  00007f4000384700(0000) GS:ffff880003e86000(0000) 
knlGS:0000000000000000
[  150.865235] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.865242] CR2: 00007f3fff9b5cc1 CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.865250] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.865259] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.865267] Process migration/1 (pid: 6, threadinfo ffff88003ea5a000, task 
ffff88003ea52de0)
[  150.865276] Stack:
[  150.865280]  ffff880003e89ef8 ffffffff810cb300 0000000000000200 
0000000000000000
[  150.865293] <0> ffffffff81a23840 ffffffff81a23940 0000000000000007 
0000000000000200
[  150.865307] <0> 0000000000000001 0000000000000100 ffff880003e89f18 
ffffffff810cda42
[  150.865323] Call Trace:
[  150.865328]  <IRQ> 
[  150.865337]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.865347]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.865358]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.865368]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865378]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.865385]  <EOI> 
[  150.865392]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865403]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.865409]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.865416]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.865421]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.865427]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.865433]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.865438]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.865444]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.865451]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.865457]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.865463]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.865469]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.865474]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.865481]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.865487]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.865493]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.865497] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.865567] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.865573]  RSP <ffff880003e89ea8>
[  150.865580] ---[ end trace 16903f0f669bcfd1 ]---
[  150.865584] Kernel panic - not syncing: Fatal exception in interrupt
[  150.865587] ------------[ cut here ]------------
[  150.865590] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.865593] invalid opcode: 0000 [#2] SMP 
[  150.865596] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.865599] CPU 0 
[  150.865600] Modules linked in: lp parport xen_blkfront xen_netfront
[  150.865605] 
[  150.865608] Pid: 4, comm: migration/0 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.865611] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] 
dummy_handler+0x4/0x10
[  150.865618] RSP: e02b:ffff880003e6bea8  EFLAGS: 00010046
[  150.865621] RAX: ffffffffff57b000 RBX: ffff88003fc0c060 RCX: 0000000000000000
[  150.865623] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 0000000000000001
[  150.865626] RBP: ffff880003e6bea8 R08: 0000000000000000 R09: 0000000000000000
[  150.865629] R10: ffff880003e73028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.865631] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000100
[  150.865638] FS:  00007ff0fcd32700(0000) GS:ffff880003e68000(0000) 
knlGS:0000000000000000
[  150.865641] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.865643] CR2: 000000000097f808 CR3: 00000000035fc000 CR4: 0000000000002660
[  150.865646] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.865650] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.865653] Process migration/0 (pid: 4, threadinfo ffff88003ea4e000, task 
ffff88003ea50000)
[  150.865655] Stack:
[  150.865657]  ffff880003e6bef8 ffffffff810cb300 ffffffff81ad1760 
0000000000000000
[  150.865661] <0> 0000000000000100 ffffffff81a23340 0000000000000001 
0000000000000000
[  150.865665] <0> 0000000000000001 0000000000000100 ffff880003e6bf18 
ffffffff810cda42
[  150.865671] Call Trace:
[  150.865672]  <IRQ> 
[  150.865677]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.865681]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.865686]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.865690]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865694]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.865696]  <EOI> 
[  150.865700]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865704]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.865708]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.865712]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.865716]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.865720]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.865724]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.865728]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.865731]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.865736]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.865740]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.865744]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.865748]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.865752]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.865756]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.865760]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.865764]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.865766] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.865802] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.865807]  RSP <ffff880003e6bea8>
[  150.865812] ---[ end trace 16903f0f669bcfd2 ]---
[  150.865815] Kernel panic - not syncing: Fatal exception in interrupt
[  150.865818] ------------[ cut here ]------------
[  150.865821] Pid: 4, comm: migration/0 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.865824] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.865826] Call Trace:
[  150.865827] invalid opcode: 0000 [#3]  <IRQ> SMP 
[  150.865832]  [<ffffffff8158b8eb>] panic+0x90/0x113
[  150.865834] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.865838]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.865840] CPU 2 
[  150.865841] Modules linked in: [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.865845]  lp parport [<ffffffff8100de4b>] die+0x5b/0x90
[  150.865849]  xen_blkfront xen_netfront [<ffffffff8158f484>] 
do_trap+0xc4/0x170
[  150.865853] 
[  150.865855] 
[  150.865857]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.865860] Pid: 9, comm: migration/2 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.865862] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] ? 
dummy_handler+0x4/0x10
[  150.865868]  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.865870] RSP: e02b:ffff880003ea7ea8  EFLAGS: 00010046
[  150.865873]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.865875] RAX: ffffffffff57b000 RBX: ffff88003fc0c4e0 RCX: 0000000000000000
[  150.865878] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 000000000000000d
[  150.865881]  [<ffffffff8100733f>] ? xen_restore_fl_direct_end+0x0/0x1
[  150.865883] RBP: ffff880003ea7ea8 R08: 0000000000000400 R09: 0000000000000000
[  150.865885] R10: ffff880003eaf028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.865889]  [<ffffffff810cfe39>] ? check_for_new_grace_period+0xb9/0xd0
[  150.865892] R13: 0000000000000000 R14: 000000000000000d R15: 0000000000000100
[  150.865895]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.865897] FS:  00007f4000384700(0000) GS:ffff880003ea4000(0000) 
knlGS:0000000000000000
[  150.865900] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.865903]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.865905] CR2: 00007f3fff9b5cc1 CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.865907] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.865910]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.865913] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.865915] Process migration/2 (pid: 9, threadinfo ffff88003ea84000, task 
ffff88003ea90000)
[  150.865918]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.865920] Stack:
[  150.865921]  ffff880003ea7ef8 [<ffffffff810cda42>] 
handle_percpu_irq+0x42/0x80
[  150.865925]  ffffffff810cb300 0000000000000400 [<ffffffff81349a56>] 
xen_evtchn_do_upcall+0x1d6/0x200
[  150.865929]  0000000000000000
[  150.865931] <0> [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865934]  ffffffff81a23e40 ffffffff81a23f40 [<ffffffff8100b02e>] 
xen_do_hypervisor_callback+0x1e/0x30
[  150.865939]  000000000000000d <EOI>  0000000000000400
[  150.865942] <0> [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865945]  0000000000000001 0000000000000100 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.865950]  ffff880003ea7f18 ffffffff810cda42 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.865955] 
[  150.865956] Call Trace:
[  150.865959]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.865961]  <IRQ> 
[  150.865964]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.865967]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.865971]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.865974]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.865977]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.865980]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.865984]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.865987]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.865990]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.865993]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.865995]  <EOI>  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.865999]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866003]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866006]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866010]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866012]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866016]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866019]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.866022]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866025]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866029]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866032]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866035]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866038]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866041]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866044]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866047]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866050]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866054]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866058]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866061]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866064]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866067]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866069]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866072]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866073] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.866097] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866099]  RSP <ffff880003ea7ea8>
[  150.866104] ---[ end trace 16903f0f669bcfd3 ]---
[  150.866106] Kernel panic - not syncing: Fatal exception in interrupt
[  150.866108] ------------[ cut here ]------------
[  150.866111] Pid: 9, comm: migration/2 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.866114] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.866116] Call Trace:
[  150.866117] invalid opcode: 0000 [#4]  <IRQ> SMP 
[  150.866121]  [<ffffffff8158b8eb>] panic+0x90/0x113
[  150.866123] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.866127]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866128] CPU 3 
[  150.866130] Modules linked in: [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.866133]  lp parport [<ffffffff8100de4b>] die+0x5b/0x90
[  150.866137]  xen_blkfront xen_netfront [<ffffffff8158f484>] 
do_trap+0xc4/0x170
[  150.866141] 
[  150.866143] 
[  150.866145]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.866148] Pid: 12, comm: migration/3 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.866151] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] ? 
dummy_handler+0x4/0x10
[  150.866156]  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866158] RSP: e02b:ffff880003ec5ea8  EFLAGS: 00010046
[  150.866161]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.866164] RAX: ffffffffff57b000 RBX: ffff88003fc0c8a0 RCX: 0000000000000000
[  150.866166] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 0000000000000013
[  150.866169] RBP: ffff880003ec5ea8 R08: 0000000000000600 R09: 0000000000000000
[  150.866172]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.866174] R10: ffff880003ecd028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.866176] R13: 0000000000000000 R14: 0000000000000013 R15: 0000000000000100
[  150.866179]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.866182] FS:  00007ff3e47dc700(0000) GS:ffff880003ec2000(0000) 
knlGS:0000000000000000
[  150.866185] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.866188]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.866190] CR2: 00007ff3e47e3000 CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.866193]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.866195] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.866199]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866201] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.866204] Process migration/3 (pid: 12, threadinfo ffff88003ea9e000, task 
ffff88003ea944d0)
[  150.866207]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866208] Stack:
[  150.866210]  ffff880003ec5ef8 [<ffffffff81349a56>] 
xen_evtchn_do_upcall+0x1d6/0x200
[  150.866214]  ffffffff810cb300 0000000000000600 [<ffffffff810b3300>] ? 
cpu_stopper_thread+0x110/0x1d0
[  150.866218]  0000000000000000
[  150.866219] <0> [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.866223]  ffff88003fc02800 <EOI>  ffff88003fc02900 0000000000000013 
[<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866228]  0000000000000600
[  150.866230] <0> [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866233]  0000000000000001 0000000000000100 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.866238]  ffff880003ec5f18 ffffffff810cda42 [<ffffffff81006bad>] ? 
xen_force_evtchn_callback+0xd/0x10
[  150.866242] 
[  150.866243] Call Trace:
[  150.866246]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866248]  <IRQ>  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866253]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866256]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866260]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866263]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866266]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.866269]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866272]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866275]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866278]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.866280]  <EOI>  [<ffffffff8158e6de>] ? 
_raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866285]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866288]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866292]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866294]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866298]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866301]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866304]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.866308]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866310]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866314]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866318]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866320]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866323]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866327]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866330]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866333]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866337]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866340]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866343]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866346]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866350]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866353]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866356]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866358] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.866390] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866393]  RSP <ffff880003ec5ea8>
[  150.866397] ---[ end trace 16903f0f669bcfd4 ]---
[  150.866399] Kernel panic - not syncing: Fatal exception in interrupt
[  150.866402] Pid: 12, comm: migration/3 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.866405] ------------[ cut here ]------------
[  150.866408] Call Trace:
[  150.866410] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.866412]  <IRQ> 
[  150.866414] invalid opcode: 0000 [#5] SMP  [<ffffffff8158b8eb>] 
panic+0x90/0x113
[  150.866419] 
[  150.866421] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.866424]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866426] CPU 4 
[  150.866428] Modules linked in: [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.866432]  lp parport [<ffffffff8100de4b>] die+0x5b/0x90
[  150.866436]  xen_blkfront xen_netfront [<ffffffff8158f484>] 
do_trap+0xc4/0x170
[  150.866441] 
[  150.866442] 
[  150.866445]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.866448] Pid: 15, comm: migration/4 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.866451] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] ? 
dummy_handler+0x4/0x10
[  150.866458]  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866461] RSP: e02b:ffff880003ee3ea8  EFLAGS: 00010046
[  150.866464]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.866466] RAX: ffffffffff57b000 RBX: ffff88003fc0cd20 RCX: 0000000000000000
[  150.866470] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 0000000000000019
[  150.866473]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.866475] RBP: ffff880003ee3ea8 R08: 0000000000000800 R09: 0000000000000000
[  150.866479] R10: ffff880003eeb028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.866482]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.866484] R13: 0000000000000000 R14: 0000000000000019 R15: 0000000000000100
[  150.866488]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.866491] FS:  00007ff3e47dc700(0000) GS:ffff880003ee0000(0000) 
knlGS:0000000000000000
[  150.866494] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.866497]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.866499] CR2: 00000000014b3bb8 CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.866503]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866505] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.866509]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866511] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.866515] Process migration/4 (pid: 15, threadinfo ffff88003eab8000, task 
ffff88003eab16f0)
[  150.866518]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.866520] Stack:
[  150.866522]  ffff880003ee3ef8 [<ffffffff810b3300>] ? 
cpu_stopper_thread+0x110/0x1d0
[  150.866526]  ffffffff810cb300 0000000000000800 [<ffffffff8100b02e>] 
xen_do_hypervisor_callback+0x1e/0x30
[  150.866531]  0000000000000000 <EOI> 
[  150.866533] <0> ffff88003fc02e00 [<ffffffff810b3300>] ? 
cpu_stopper_thread+0x110/0x1d0
[  150.866538]  ffff88003fc02f00 0000000000000019 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.866543]  0000000000000800
[  150.866545] <0> [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866549]  0000000000000001 0000000000000100 [<ffffffff81006bad>] ? 
xen_force_evtchn_callback+0xd/0x10
[  150.866554]  ffff880003ee3f18 ffffffff810cda42 [<ffffffff81007352>] ? 
check_events+0x12/0x20
[  150.866558] 
[  150.866560] Call Trace:
[  150.866563]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866565]  <IRQ>  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866571]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866574]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866578]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866581]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866585]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.866588]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866592]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866596]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866600]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.866603]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866605]  <EOI> 
[  150.866608]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866611]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866614]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866619]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866622]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866626]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866629]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866633]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.866636]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866640]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866644]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866648]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866652]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866656]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866660]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866664]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866668]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866671]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866675]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866679]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866683]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866687]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.866689] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.866724] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866728]  RSP <ffff880003ee3ea8>
[  150.866733] ---[ end trace 16903f0f669bcfd5 ]---
[  150.866736] Kernel panic - not syncing: Fatal exception in interrupt
[  150.866739] Pid: 15, comm: migration/4 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.866742] ------------[ cut here ]------------
[  150.866745] Call Trace:
[  150.866747] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.866750]  <IRQ> 
[  150.866752] invalid opcode: 0000 [#6] SMP  [<ffffffff8158b8eb>] 
panic+0x90/0x113
[  150.866756] 
[  150.866758] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.866762]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866764] CPU 5 
[  150.866766] Modules linked in: [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.866770]  lp parport [<ffffffff8100de4b>] die+0x5b/0x90
[  150.866775]  xen_blkfront xen_netfront [<ffffffff8158f484>] 
do_trap+0xc4/0x170
[  150.866780] 
[  150.866782] 
[  150.866784]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.866787] Pid: 18, comm: migration/5 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.866791] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] ? 
dummy_handler+0x4/0x10
[  150.866798]  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.866801] RSP: e02b:ffff880003f01ea8  EFLAGS: 00010046
[  150.866804]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.866807] RAX: ffffffffff57b000 RBX: ffff88003ea7b1e0 RCX: 0000000000000000
[  150.866810] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 000000000000001f
[  150.866814]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.866816] RBP: ffff880003f01ea8 R08: 0000000000000a00 R09: 0000000000000000
[  150.866819] R10: ffff880003f09028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.866823]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.866825] R13: 0000000000000000 R14: 000000000000001f R15: 0000000000000100
[  150.866829]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.866832] FS:  00007ff3e47dc700(0000) GS:ffff880003efe000(0000) 
knlGS:0000000000000000
[  150.866835] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.866839]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.866841] CR2: 00007ff3e32ec4d6 CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.866845]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866848] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.866851] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.866855]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866858] Process migration/5 (pid: 18, threadinfo ffff88003eac2000, task 
ffff88003eab5bc0)
[  150.866860] Stack:
[  150.866863]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.866865]  ffff880003f01ef8 ffffffff810cb300 [<ffffffff810b3300>] ? 
cpu_stopper_thread+0x110/0x1d0
[  150.866871]  0000000000000a00 0000000000000000 [<ffffffff8100b02e>] 
xen_do_hypervisor_callback+0x1e/0x30
[  150.866876] 
[  150.866877] <0> <EOI>  ffff88003fc03400 ffff88003fc03500 
[<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866883]  000000000000001f 0000000000000a00 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.866889] 
[  150.866890] <0> 0000000000000001 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.866895]  0000000000000100 ffff880003f01f18 [<ffffffff81006bad>] ? 
xen_force_evtchn_callback+0xd/0x10
[  150.866901]  ffffffff810cda42
[  150.866904]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866906] Call Trace:
[  150.866908]  <IRQ>  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866915]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.866919]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.866923]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.866926]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.866931]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.866934]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.866938]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866942]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.866945]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.866948]  <EOI>  [<ffffffff8158e6de>] ? 
_raw_spin_unlock_irqrestore+0x1e/0x30
[  150.866955]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.866958]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.866963]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866966]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.866970]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.866973]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.866978]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.866982]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.866986]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.866989]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.866994]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.866997]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.867001]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.867004]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.867008]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.867012]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.867017]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867020]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.867024]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.867028]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.867032]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.867036]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.867040]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.867042] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.867081] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.867086]  RSP <ffff880003f01ea8>
[  150.867091] ---[ end trace 16903f0f669bcfd6 ]---
[  150.867093] Kernel panic - not syncing: Fatal exception in interrupt
[  150.867097] Pid: 18, comm: migration/5 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.867100] ------------[ cut here ]------------
[  150.867102] Call Trace:
[  150.867104] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.867106]  <IRQ> 
[  150.867108] invalid opcode: 0000 [#7] SMP  [<ffffffff8158b8eb>] 
panic+0x90/0x113
[  150.867113] 
[  150.867114] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.867118]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867120] CPU 6 
[  150.867122] Modules linked in: [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.867126]  lp parport [<ffffffff8100de4b>] die+0x5b/0x90
[  150.867130]  xen_blkfront xen_netfront [<ffffffff8158f484>] 
do_trap+0xc4/0x170
[  150.867135] 
[  150.867136] 
[  150.867139]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.867142] Pid: 21, comm: migration/6 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.867145] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] ? 
dummy_handler+0x4/0x10
[  150.867151]  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.867154] RSP: e02b:ffff880003f1fea8  EFLAGS: 00010046
[  150.867157]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.867159] RAX: ffffffffff57b000 RBX: ffff88003ea7b660 RCX: 0000000000000000
[  150.867162] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 0000000000000025
[  150.867165]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.867168] RBP: ffff880003f1fea8 R08: 0000000000000c00 R09: 0000000000000000
[  150.867170] R10: ffff880003f27028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.867173]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.867176] R13: 0000000000000000 R14: 0000000000000025 R15: 0000000000000100
[  150.867179]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.867183] FS:  00007fba0e73e720(0000) GS:ffff880003f1c000(0000) 
knlGS:0000000000000000
[  150.867186] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.867189]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.867191] CR2: 00007fba0e744000 CR3: 000000003cccc000 CR4: 0000000000002660
[  150.867194] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.867197]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.867199] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.867202] Process migration/6 (pid: 21, threadinfo ffff88003eadc000, task 
ffff88003ead2de0)
[  150.867205]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.867207] Stack:
[  150.867209]  ffff880003f1fef8 [<ffffffff81349a56>] 
xen_evtchn_do_upcall+0x1d6/0x200
[  150.867213]  ffffffff810cb300 0000000000000c00 [<ffffffff810b3300>] ? 
cpu_stopper_thread+0x110/0x1d0
[  150.867218]  0000000000000000
[  150.867220] <0> [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.867223]  ffff88003fc03a00 <EOI>  ffff88003fc03b00 0000000000000025 
[<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.867230]  0000000000000c00
[  150.867231] <0> [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.867235]  0000000000000001 0000000000000100 [<ffffffff8100122a>] ? 
hypercall_page+0x22a/0x1010
[  150.867241]  ffff880003f1ff18 ffffffff810cda42 [<ffffffff81006bad>] ? 
xen_force_evtchn_callback+0xd/0x10
[  150.867246] 
[  150.867247] Call Trace:
[  150.867250]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.867252]  <IRQ>  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.867259]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.867262]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.867266]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.867269]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.867273]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.867276]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.867280]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.867283]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.867286]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.867288]  <EOI>  [<ffffffff8158e6de>] ? 
_raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867294]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.867297]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.867301]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.867304]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.867308]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.867311]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.867315]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.867319]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.867322]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.867326]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.867329]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.867333]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.867336]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.867339]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.867343]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.867346]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.867350]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867353]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.867356]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.867359]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.867363]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.867366]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.867369]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.867371] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.867403] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.867406]  RSP <ffff880003f1fea8>
[  150.867409] ---[ end trace 16903f0f669bcfd7 ]---
[  150.867411] Kernel panic - not syncing: Fatal exception in interrupt
[  150.867414] Pid: 21, comm: migration/6 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.867416] Call Trace:
[  150.867417]  <IRQ>  [<ffffffff8158b8eb>] panic+0x90/0x113
[  150.867423]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867426]  [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.867429]  [<ffffffff8100de4b>] die+0x5b/0x90
[  150.867432]  [<ffffffff8158f484>] do_trap+0xc4/0x170
[  150.867435]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.867439]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.867442]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.867445]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.867448]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.867452]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.867455]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.867458]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.867461]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.867464]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.867468]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.867471]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.867473]  <EOI>  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.867478]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.867481]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.867485]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.867488]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.867491]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.867494]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.867498]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.867501]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.867504]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.867507]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.867510]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.867513]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.867517]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.867520]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.867523]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.867526]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.875072] ------------[ cut here ]------------
[  150.875072] kernel BUG at 
/build/buildd/linux-2.6.35/arch/x86/xen/spinlock.c:344!
[  150.875072] invalid opcode: 0000 [#8] SMP 
[  150.875072] last sysfs file: 
/sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
[  150.875072] CPU 7 
[  150.875072] Modules linked in: lp parport xen_blkfront xen_netfront
[  150.875072] 
[  150.875072] Pid: 24, comm: migration/7 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu /
[  150.875072] RIP: e030:[<ffffffff81007d24>]  [<ffffffff81007d24>] 
dummy_handler+0x4/0x10
[  150.875072] RSP: e02b:ffff880003f3dea8  EFLAGS: 00010046
[  150.875072] RAX: ffffffffff57b000 RBX: ffff88003ea7bae0 RCX: 0000000000000000
[  150.875072] RDX: 0000000000400200 RSI: 0000000000000000 RDI: 000000000000002b
[  150.875072] RBP: ffff880003f3dea8 R08: 0000000000000e00 R09: 0000000000000000
[  150.875072] R10: ffff880003f45028 R11: 0000000000012ef0 R12: 0000000000000000
[  150.875072] R13: 0000000000000000 R14: 000000000000002b R15: 0000000000000100
[  150.875072] FS:  00007fa82decb700(0000) GS:ffff880003f3a000(0000) 
knlGS:0000000000000000
[  150.875072] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  150.875072] CR2: 00007fa82d93ad8c CR3: 0000000001a2a000 CR4: 0000000000002660
[  150.875072] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  150.875072] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  150.875072] Process migration/7 (pid: 24, threadinfo ffff88003eb04000, task 
ffff88003eb08000)
[  150.875072] Stack:
[  150.875072]  ffff880003f3def8 ffffffff810cb300 000000231f6291bf 
00000000003d1d38
[  150.875072] <0> ffff880003f3def8 ffff88003eb16100 000000000000002b 
0000000000000e00
[  150.875072] <0> 0000000000000001 0000000000000100 ffff880003f3df18 
ffffffff810cda42
[  150.875072] Call Trace:
[  150.875072]  <IRQ> 
[  150.875072]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.875072]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.875072]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.875072]  [<ffffffff810b3301>] ? cpu_stopper_thread+0x111/0x1d0
[  150.875072]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.875072]  <EOI> 
[  150.875072]  [<ffffffff810b3301>] ? cpu_stopper_thread+0x111/0x1d0
[  150.875072]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.875072]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.875072]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.875072]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.875072]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.875072]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.875072]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.875072]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.875072]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.875072]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.875072]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.875072]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.875072]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.875072]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.875072]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.875072]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.875072] Code: 89 e5 c9 0f 95 c0 c3 55 b8 01 00 00 00 86 07 84 c0 48 89 
e5 0f 94 c0 c9 0f b6 c0 c3 eb 09 90 90 90 90 90 90 90 90 90 55 48 89 e5 <0f> 0b 
eb fe eb 06 90 90 90 90 90 90 55 ba ff ff ff ff 48 89 e5 
[  150.875072] RIP  [<ffffffff81007d24>] dummy_handler+0x4/0x10
[  150.875072]  RSP <ffff880003f3dea8>
[  150.875072] ---[ end trace 16903f0f669bcfd8 ]---
[  150.875072] Kernel panic - not syncing: Fatal exception in interrupt
[  150.875072] Pid: 24, comm: migration/7 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.875072] Call Trace:
[  150.875072]  <IRQ>  [<ffffffff8158b8eb>] panic+0x90/0x113
[  150.875072]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.875072]  [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.875072]  [<ffffffff8100de4b>] die+0x5b/0x90
[  150.875072]  [<ffffffff8158f484>] do_trap+0xc4/0x170
[  150.875072]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.875072]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.875072]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.875072]  [<ffffffff8108e98e>] ? clockevents_program_event+0x5e/0xa0
[  150.875072]  [<ffffffff81090008>] ? tick_dev_program_event+0x48/0x110
[  150.875072]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.875072]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.875072]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.875072]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.875072]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.875072]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.875072]  [<ffffffff810b3301>] ? cpu_stopper_thread+0x111/0x1d0
[  150.875072]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.875072]  <EOI>  [<ffffffff810b3301>] ? cpu_stopper_thread+0x111/0x1d0
[  150.875072]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.875072]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.875072]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.875072]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.875072]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.875072]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.875072]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.875072]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.875072]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.875072]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.875072]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.875072]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.875072]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.875072]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.875072]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.875072]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[  150.870676] Pid: 6, comm: migration/1 Tainted: G      D     
2.6.35-32-generic #67-Ubuntu
[  150.870676] Call Trace:
[  150.870676]  <IRQ>  [<ffffffff8158b8eb>] panic+0x90/0x113
[  150.870676]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.870676]  [<ffffffff8158fc1a>] oops_end+0xea/0xf0
[  150.870676]  [<ffffffff8100de4b>] die+0x5b/0x90
[  150.870676]  [<ffffffff8158f484>] do_trap+0xc4/0x170
[  150.870676]  [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0
[  150.870676]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.870676]  [<ffffffff81007281>] ? xen_vcpuop_set_next_event+0x41/0x70
[  150.870676]  [<ffffffff8158e6b5>] ? _raw_spin_lock_irq+0x15/0x20
[  150.870676]  [<ffffffff8100ad5b>] invalid_op+0x1b/0x20
[  150.870676]  [<ffffffff81007d24>] ? dummy_handler+0x4/0x10
[  150.870676]  [<ffffffff810cb507>] ? irq_to_desc+0x17/0x20
[  150.870676]  [<ffffffff810cb300>] handle_IRQ_event+0x50/0x160
[  150.870676]  [<ffffffff810cda42>] handle_percpu_irq+0x42/0x80
[  150.870676]  [<ffffffff81349a56>] xen_evtchn_do_upcall+0x1d6/0x200
[  150.870676]  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.870676]  [<ffffffff8100b02e>] xen_do_hypervisor_callback+0x1e/0x30
[  150.870676]  <EOI>  [<ffffffff810b3300>] ? cpu_stopper_thread+0x110/0x1d0
[  150.870676]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.870676]  [<ffffffff8100122a>] ? hypercall_page+0x22a/0x1010
[  150.870676]  [<ffffffff81006bad>] ? xen_force_evtchn_callback+0xd/0x10
[  150.870676]  [<ffffffff81007352>] ? check_events+0x12/0x20
[  150.870676]  [<ffffffff810072f9>] ? xen_irq_enable_direct_end+0x0/0x7
[  150.870676]  [<ffffffff810b346f>] ? stop_machine_cpu_stop+0xaf/0xe0
[  150.870676]  [<ffffffff810b33c0>] ? stop_machine_cpu_stop+0x0/0xe0
[  150.870676]  [<ffffffff810b32e6>] ? cpu_stopper_thread+0xf6/0x1d0
[  150.870676]  [<ffffffff8158bff1>] ? schedule+0x3e1/0x850
[  150.870676]  [<ffffffff8158e6de>] ? _raw_spin_unlock_irqrestore+0x1e/0x30
[  150.870676]  [<ffffffff810b31f0>] ? cpu_stopper_thread+0x0/0x1d0
[  150.870676]  [<ffffffff810801e6>] ? kthread+0x96/0xa0
[  150.870676]  [<ffffffff8100aee4>] ? kernel_thread_helper+0x4/0x10
[  150.870676]  [<ffffffff8100a313>] ? int_ret_from_sys_call+0x7/0x1b
[  150.870676]  [<ffffffff8158ec5d>] ? retint_restore_args+0x5/0x6
[  150.870676]  [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10

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https://bugs.launchpad.net/bugs/1007002

Title:
  Xen VCPUs hotplug does not work

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