Happens to me on 2.6.20-8.
Feb 16 07:25:58 reactor kernel: [ 628.004000] BUG: soft lockup detected on CPU#0! Feb 16 07:25:58 reactor kernel: [ 628.004000] [softlockup_tick+156/240] softlockup_tick+0x9c/0xf0 Feb 16 07:25:58 reactor kernel: [ 628.004000] [update_process_times+51/128] update_process_times+0x33/0x80 Feb 16 07:25:58 reactor kernel: [ 628.004000] [smp_apic_timer_interrupt+112/128] smp_apic_timer_interrupt+0x70/0x80 Feb 16 07:25:58 reactor kernel: [ 628.004000] [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30 Feb 16 07:25:58 reactor kernel: [ 628.004000] [try_to_del_timer_sync+7/80] try_to_del_timer_sync+0x7/0x50 Feb 16 07:25:58 reactor kernel: [ 628.004000] [del_timer_sync+14/32] del_timer_sync+0xe/0x20 Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a130bf>] MlmeAuthReqAction+0x5f/0x1e0 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a07b58>] MlmeQueueFull+0x28/0x40 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a07ccc>] MlmeEnqueue+0xbc/0xf0 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [do_timer+564/2080] do_timer+0x234/0x820 Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a129b0>] AuthTimeout+0x0/0x40 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a0ced3>] CntlWaitAuthProc+0x73/0x110 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a129b0>] AuthTimeout+0x0/0x40 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a047de>] StateMachinePerformAction+0x1e/0x30 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a09481>] MlmeHandler+0x151/0x170 [rt61] Feb 16 07:25:58 reactor kernel: [ 628.004000] [run_timer_softirq+303/416] run_timer_softirq+0x12f/0x1a0 Feb 16 07:25:58 reactor kernel: [ 628.004000] [timer_interrupt+89/176] timer_interrupt+0x59/0xb0 Feb 16 07:25:58 reactor kernel: [ 628.004000] [__do_softirq+130/256] __do_softirq+0x82/0x100 Feb 16 07:25:58 reactor kernel: [ 628.004000] [do_softirq+85/96] do_softirq+0x55/0x60 Feb 16 07:25:58 reactor kernel: [ 628.004000] [smp_apic_timer_interrupt+117/128] smp_apic_timer_interrupt+0x75/0x80 Feb 16 07:25:58 reactor kernel: [ 628.004000] [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30 Feb 16 07:25:58 reactor kernel: [ 628.004000] [default_idle+0/96] default_idle+0x0/0x60 Feb 16 07:25:58 reactor kernel: [ 628.004000] [native_safe_halt+2/16] native_safe_halt+0x2/0x10 Feb 16 07:25:58 reactor kernel: [ 628.004000] [default_idle+61/96] default_idle+0x3d/0x60 Feb 16 07:25:58 reactor kernel: [ 628.004000] [cpu_idle+73/208] cpu_idle+0x49/0xd0 Feb 16 07:25:58 reactor kernel: [ 628.004000] [start_kernel+863/1056] start_kernel+0x35f/0x420 Feb 16 07:25:58 reactor kernel: [ 628.004000] [unknown_bootoption+0/608] unknown_bootoption+0x0/0x260
Happens to me on 2.6.20-8.
Feb 16 07:25:58 reactor kernel: [ 628.004000] BUG: soft lockup detected on CPU#0! tick+156/ 240] softlockup_ tick+0x9c/ 0xf0 process_ times+51/ 128] update_ process_ times+0x33/ 0x80 timer_interrupt +112/128] smp_apic_ timer_interrupt +0x70/0x80 interrupt+ 40/48] apic_timer_ interrupt+ 0x28/0x30 del_timer_ sync+7/ 80] try_to_ del_timer_ sync+0x7/ 0x50 sync+14/ 32] del_timer_ sync+0xe/ 0x20 on+0x5f/ 0x1e0 [rt61] 0x28/0x40 [rt61] 0xbc/0xf0 [rt61] 0x234/0x820 0x0/0x40 [rt61] c+0x73/ 0x110 [rt61] 0x0/0x40 [rt61] formAction+ 0x1e/0x30 [rt61] 0x151/0x170 [rt61] softirq+ 303/416] run_timer_ softirq+ 0x12f/0x1a0 interrupt+ 89/176] timer_interrupt +0x59/0xb0 130/256] __do_softirq+ 0x82/0x100 0x55/0x60 timer_interrupt +117/128] smp_apic_ timer_interrupt +0x75/0x80 interrupt+ 40/48] apic_timer_ interrupt+ 0x28/0x30 idle+0x0/ 0x60 safe_halt+ 2/16] native_ safe_halt+ 0x2/0x10 idle+61/ 96] default_ idle+0x3d/ 0x60 kernel+ 863/1056] start_kernel+ 0x35f/0x420 bootoption+ 0/608] unknown_ bootoption+ 0x0/0x260
Feb 16 07:25:58 reactor kernel: [ 628.004000] [softlockup_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [update_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [smp_apic_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [apic_timer_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [try_to_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [del_timer_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a130bf>] MlmeAuthReqActi
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a07b58>] MlmeQueueFull+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a07ccc>] MlmeEnqueue+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [do_timer+564/2080] do_timer+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a129b0>] AuthTimeout+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a0ced3>] CntlWaitAuthPro
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a129b0>] AuthTimeout+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a047de>] StateMachinePer
Feb 16 07:25:58 reactor kernel: [ 628.004000] [<f8a09481>] MlmeHandler+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [run_timer_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [timer_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [__do_softirq+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [do_softirq+85/96] do_softirq+
Feb 16 07:25:58 reactor kernel: [ 628.004000] [smp_apic_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [apic_timer_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [default_idle+0/96] default_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [native_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [default_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [cpu_idle+73/208] cpu_idle+0x49/0xd0
Feb 16 07:25:58 reactor kernel: [ 628.004000] [start_
Feb 16 07:25:58 reactor kernel: [ 628.004000] [unknown_