panic with tg_shares_up again?

[Yinghai Lu]

yesterday's tip on one 32 cores sytem

[   22.048032] calling  hpet_late_init+0x0/0x19c @ 1
[   22.052037] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 31
[   22.057035] hpet0: 3 comparators, 32-bit 25.000000 MHz counter
[   22.068047] divide error: 0000 [#1] SMP
[   22.071994] last sysfs file:
[   22.072030] CPU 8
[   22.072030] Modules linked in:
[   22.072030] Pid: 0, comm: swapper Not tainted
2.6.28-rc8-tip-01347-gab88ef6-dirty #327
[   22.072030] RIP: 0010:[<ffffffff8025066e>]  [<ffffffff8025066e>]
tg_shares_up+0x100/0x1d1
[   22.072030] RSP: 0018:ffff882024a87d48  EFLAGS: 00010246
[   22.072030] RAX: 0000000000618800 RBX: ffff880028081680 RCX: ffff88084421d680
[   22.072030] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
[   22.072030] RBP: ffff882024a87db8 R08: 0000000000000080 R09: ffff88104441e460
[   22.072030] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81117da0
[   22.072030] R13: 0000000000000040 R14: 0000000000000004 R15: 0000000000000800
[   22.072030] FS:  0000000000000000(0000) GS:ffff881824da7980(0000)
knlGS:0000000000000000
[   22.072030] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[   22.072030] CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
[   22.072030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   22.072030] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   22.072030] Process swapper (pid: 0, threadinfo ffff88182467c000,
task ffff880824af9650)
[   22.072030] Stack:
[   22.072030]  0000000000000020 ffffffff810ed680 0000000000001000
0000000000000000
[   22.072030]  0000000000000000 ffff88104441e460 0000000000000283
00000004810ee000
[   22.072030]  0000000000000000 ffffffff81117da0 ffff88104441e360
ffffffff8025056e
[   22.072030] Call Trace:
[   22.072030]  <IRQ> <0> [<ffffffff8025056e>] ? tg_shares_up+0x0/0x1d1
[   22.072030]  [<ffffffff8024a9e1>] ? tg_nop+0x0/0x8
[   22.072030]  [<ffffffff8024cd78>] walk_tg_tree+0x74/0x8d
[   22.072030]  [<ffffffff80254063>] update_shares+0x48/0x4d
[   22.072030]  [<ffffffff80254478>] rebalance_domains+0x161/0x53c
[   22.072030]  [<ffffffff8025489c>] run_rebalance_domains+0x49/0xe4
[   22.072030]  [<ffffffff8026020a>] __do_softirq+0x83/0x145
[   22.072030]  [<ffffffff8022a15c>] call_softirq+0x1c/0x28
[   22.072030]  [<ffffffff8022b0a0>] do_softirq+0x34/0x76
[   22.072030]  [<ffffffff8025ff1b>] irq_exit+0x3f/0x82
[   22.072030]  [<ffffffff8023a75d>] smp_apic_timer_interrupt+0x93/0xac
[   22.072030]  [<ffffffff80229b73>] apic_timer_interrupt+0x13/0x20
[   22.072030]  <EOI> <0>Code: 44 24 08 4a 8b 0c f0 48 85 c9 0f 84 b6
00 00 00 49 8b 44 24 10 4a 8b 04 f0 48 8b 80 a8 00 00 00 48 85 c0 74
10 49 0f af c7 31 d2 <48> f7 75 b0 48 89 45 d0 eb 11 4c 89 f8 31 d2 48
c7 45 d0 00 00
[   22.072030] RIP  [<ffffffff8025066e>] tg_shares_up+0x100/0x1d1
[   22.072030]  RSP <ffff882024a87d48>
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