Kernel panic in find_busiest_group

We are experiencing a kernel panic in find_busiest_group function call (find_busiest_group+0x3f1/0xbb0); the issue seems to be causes by a division by zero.

The issue seems to be related to these bug reports:
• Ubuntu: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/824304
• Ubuntu: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1024309
• RHEL5: https://bugzilla.redhat.com/show_bug.cgi?id=644903

We are running a large number of servers using the 2.6.35-30-server kernel on HP blade and HP rack servers (physical servers, no vmware, etc). The servers have been stable for >200 days but startin som weeks ago servers started locking up (at least 7 servers up to now).

In the postings mentioned above I see large similarity with our issue.
- are we experiencing the same issue(s)?
- where can we find a released patch for this issue?
- or, which kernel version has such a patch included by default?

Kind regards

Michiel

What we see on screen after the kernel panic (no dumps, system is completely unresponsive):
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[1502604.203815] [<ffffffff8159a67c>1 start secondary+Ox100/0x102
[1502604.203827] Code: 90 90 Bb 48 08 48 86 60 48 01 ca 48 39 e6 75 fZ 41 89 51 08 48 86 95 60 fe ff fl 48 Elb 75 98 86 4a 08 413 89 10 31 d2 48 cl cO Od <48> 17 ft 48 86 4d a0 48 89 45 90 31 GO 48 85 c9 74 Oc 48 86 45
[1502604.203870] RIP Wfffffff81050c71>1 find_busiest_group+0x3f1/0x660
[1502604.203877] RSP <ff1188052e223660>
[1502604.203902] 1 end trace 9e41a1d3ca5e1318
[1502604.203913] Hemel panic - not syncing: Fatal exception in interrupt
[15011604.203927] lid: 0, comm: swapper Tainted: G D 2.6.35-30-server 061-Ubuntu
[1502604.203930] Call Trace,
[1502604.203933] <IRQ> [afffffff8159ff65>1 panic+0x90/0x113
[1502604.203972] f<ffffifff815a421a>1 oops_end+0xea/Oxf0
[1502604.203981] [afffffff13100de01,>1 die+Ox56/0x90
[1502604.203993] 1<ffffffff815a3a84>1 do_trap+Oxc4/0x170
[1502604.204001] [(ffffffff810066ff>] do_diuide_error*Ox0f/Ox60
[1502604.204029] [afffffff81050c71>1 ? find_busiest_group+Ox3f1/0x660
[1502604.204037] Iaffffff1810513607>1 ? try_to_wake_up0x267/0x400
[1502604.204050] Wfffffff8100acfb>1 divide_error+Ox16/0x20
[1502604.204071] Wfffffff81050c71>1 ? find_busiest_group+Ox3f1/0x660
[1502604.204097] [affffffal11076f6>1 ? free_one_page+Oxla6/0x3f0
[1502604.204106] Wfffffff81057560>1 load_balance+Oxd0/0x520
[1502604.204125] Wfffffff81011609>1 ? sched_clock+0x9/0x10
[1502604.204136] [<ffffffff810118d3>I ? native_sched_clock+Ox13/0x60
[1502604.204147] f<ffffifff81057a99>1 rebalance_domains+0x99/0x180
[1502604.204162] [afffffff810571.9>1 run_rebalance_domains+0x49/Oxf0
[1502604.204187] 1<ffffffff8108a633>1 ? ktime_get+0x63/0xe0
[1502604.204202] [(ffffffff8106(162d>1 do_softirg+Oxbd/8x200
[1502604.204221] [afffffff8108f9ca>1 ? tick_prograo_event+Ox2a/0x30
[1502604.204229] Iafffffff13100afdc>1 call_softirq+Oxlc/0x30
[1502604.204252] Wfffffff8100ca65>1 do_softirg+0x65/0xa0
[1502604.204260] [(ffffffff8106134e5>1 irg_exit+0x135/0x90
[1502604.204287] [<ffffffff815aa730>I sop_apictimer_interrupt+0x70/0x96
[1502604.204306] [<ffffffff8100aa93>1 apic_timer_interrupt+0x13/0x20
[1502604.204312] <ED]> f<ffff11ff8130a664>1 7 intel_idle+Oxe4/0x180
[1502604.204335] [<ffffffff8130a647>1 ? intel_idle+Oxc7/00180
[1502604.204375] f<ffffifff814876c2>1 cpuidle_idle_call+0x92/0x140
[1502604.204425] [afffffff131008d93>1 cpu idle+Ox63/0x110
[1502604.204436] 1<ffffffff8159a67c>1 start_secondary+Ox100/0x102
[1502605.273609] panic occurred, switching back to text console
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