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): -------------------------- [1502604.203815] [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 [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] [afffffff8159ff65>1 panic+0x90/0x113 [1502604.203972] f1 oops_end+0xea/Oxf0 [1502604.203981] [afffffff13100de01,>1 die+Ox56/0x90 [1502604.203993] 11 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] [I ? native_sched_clock+Ox13/0x60 [1502604.204147] f1 rebalance_domains+0x99/0x180 [1502604.204162] [afffffff810571.9>1 run_rebalance_domains+0x49/Oxf0 [1502604.204187] 11 ? 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] [I sop_apictimer_interrupt+0x70/0x96 [1502604.204306] [1 apic_timer_interrupt+0x13/0x20 [1502604.204312] f1 7 intel_idle+Oxe4/0x180 [1502604.204335] [1 ? intel_idle+Oxc7/00180 [1502604.204375] f1 cpuidle_idle_call+0x92/0x140 [1502604.204425] [afffffff131008d93>1 cpu idle+Ox63/0x110 [1502604.204436] 11 start_secondary+Ox100/0x102 [1502605.273609] panic occurred, switching back to text console --------------------------

When	Who	Action	New State
2012-12-12	actionparsnip	Answer	Answered
2012-12-12	M Janssen	Reopen	Open
2012-12-12	actionparsnip	Comment	Open

Ubuntulinux package

History of question #216591

Ubuntu
linux package