3.9.0: panic during boot at tick_do_broadcast

[CAI Qian]

Never saw any of those during testing of all 3.9 rc releases.

[    1.023422] Intel PMU driver. 
[    1.025859] perf_event_intel: PEBS disabled due to CPU errata, please upgrade microcode 
[    1.032534] ... version:                3 
[    1.036078] ... bit width:              48 
[    1.039506] ... generic registers:      8 
[    1.042856] ... value mask:             0000ffffffffffff 
[    1.047382] ... max period:             000000007fffffff 
[    1.052229] ... fixed-purpose events:   3 
[    1.055641] ... event mask:             00000007000000ff 
[    1.065070] smpboot: Booting Node   0, Processors  #1 
[    1.082422] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048 
[    1.089361] IP: [<ffffffff810a73af>] tick_do_broadcast+0x6f/0xb0 
[    1.094455] PGD 0  
[    1.096126] Oops: 0000 [#1] SMP  
[    1.098793] Modules linked in: 
[    1.101464] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0+ #1 
[    1.106487] Hardware nt DL120 G7, BIOS J01 02/01/2012 
[    1.510871] task: ffff8802041c8000 ti: ffff8802041c2000 task.ti: ffff8802041c2000 
[    1.517310] RIP: 0010:[<ffffffff810a73af>]  [<ffffffff810a73af>] tick_do_broadcast+0x6f/0xb0 
[    1.524408] RSP: 0000:ffff88020f403d10  EFLAGS: 00010002 
[    1.528867] RAX: 0000000000000000 RBX: ffff88020705a0d0 RCX: 0000000000000001 
[    1.535019] RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffff88020705a0d0 
[    1.540963] RBP: ffff88020f403d20 R08: 0000000000000002 R09: 0000000000000001 
[    1.546980] R10: 0000000000000002 R11: 000000000000b37c R12: 000000000000d9a0 
[    1.553124] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 
[    1.559060] FS:  0000000000000000(0000) GS:ffff88020f400000(0000) knlGS:0000000000000000 
[    1.566007] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 
[    1.570771] CR2: 0000000000000048 CR3: 00000000018d5000 CR4: 00000000000407f0 
[    1.576792] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
[    1.582933] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
[    1.588880] Stack: 
[    1.590563]  ffffffff818dca80 ffffffff818e8400 ffff88020f403d30 ffffffff810a75b1 
[    1.596932]  ffff88020f403d50 ffffffff810a75d4 0 0000000000000000 
[    2.002208]  ffff88020f403d60 ffffffff81004935 ffff88020f403db0 ffffffff810df624 
[    2.008450] Call Trace: 
[    2.010471]  <IRQ>  
[    2.012057]  [<ffffffff810a75b1>] tick_do_periodic_broadcast+0x41/0x50 
[    2.017847]  [<ffffffff810a75d4>] tick_handle_periodic_broadcast+0x14/0x50 
[    2.023640]  [<ffffffff81004935>] timer_interrupt+0x15/0x20 
[    2.028291]  [<ffffffff810df624>] handle_irq_event_percpu+0x54/0x1e0 
[    2.033810]  [<ffffffff8108a7be>] ? task_tick_fair+0x16e/0x550 
[    2.038626]  [<ffffffff810df7f2>] handle_irq_event+0x42/0x70 
[    2.043418]  [<ffffffff810e20ff>] handle_edge_irq+0x6f/0x110 
[    2.048508]  [<ffffffff8100415f>] handle_irq+0xbf/0x150 
[    2.052945]  [<ffffffff810569c1>] ? irq_enter+0x51/0x90 
[    2.057362]  [<ffffffff8108915c>] ? update_curr+0xec/0x170 
[    2.062044]  [<ffffffff816011fa>] do_IRQ+0x5a/0xe0 
[    2.066110]  [<ffffffff815f78ea>] common_interrupt+0x6a/0x6a 
[    2.070846]  [<ffffffff810567a4>] ? __do_softirq+0x94/0x220 
[    2.075555]  [<ffffffff81056761>] ? __do_softirq+0x51/0x220 
[    2.080335]  [<ffffffff81056aa5>] irq_exit+0xa5/0xb0 
[    2.084518]  [<ffffffff816012ee>] smp_apic_timer_interrupt+0x6e/0x99 
[    2.089842]  [<ffffffff8160057a>] apic_timer_interrupt+0x6a/0x70 
[    2.095022]  <EOI>  
[    2.096597]  [<ffffffff815e0b30>] ? native_cpu_up+0x157.309461]  [<ffffffff815e21ea>] _cpu_up+0xc0/0x133 
[    2.505201]  [<ffffffff815e2334>] cpu_up+0xd7/0xea 
[    2.509184]  [<ffffffff81a0eec3>] smp_init+0x76/0xa6 
[    2.513717]  [<ffffffff819f1f55>] kernel_init_freeable+0xdb/0x1ec 
[    2.518789]  [<ffffffff815d50d0>] ? rest_init+0x80/0x80 
[    2.523207]  [<ffffffff815d50de>] kernel_init+0xe/0xf0 
[    2.527647]  [<ffffffff815ff89c>] ret_from_fork+0x7c/0xb0 
[    2.532127]  [<ffffffff815d50d0>] ? rest_init+0x80/0x80 
[    2.536569] Code: c3 0f 1f 00 48 63 35 15 8e 92 00 48 89 df 49 c7 c4 a0 d9 00 00 e8 52 e0 24 00 89 c0 48 89 df 48 8b 04 c5 e0 43 9c 81 4a 8b 04 20 <ff> 50 48 48 8b 5d f0 4c 8b 65 f8 c9 c3 0f 1f 40 00 f0 0f b3 07  
[    2.552724] RIP  [<ffffffff810a73af>] tick_do_broadcast+0x6f/0xb0 
[    2.558161]  RSP <ffff88020f403d10> 
[    2.561059] CR2: 0000000000000048 
[    2.563901] ---[ end trace e29222d88d06c928 ]--- 
[    2.567755] Kernel panic - not syncing: Fatal exception in interrupt 
[    3.600013] Shutting down cpus with NMI 

CAI Qian
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