Dave Anderson reached out and wrote:
----- Original Message -----
> [root kvm7 127.0.0.1-2014-02-07-19:17:09]# crash /boot/System.map-2.6.32-220.el6.x86_64.debug /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux vmcore
>
> crash 5.1.8-1.el6
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> Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
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> Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
> Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
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> GNU gdb (GDB) 7.0
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> >
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>
> crash: page excluded: kernel virtual address: ffffffff81542000 type: "cpu_possible_mask"
>
> I can go into minimal,
>
>
> nm -Bn /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux | grep _stext
> ffffffff81000198 T _stext
>
> cat /proc/kallsyms | grep _stext
> ffffffff81000198 T _stext
>
> If I use the System Map parm I get this warning
>
> WARNING: kernels compiled by different gcc versions:
> /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64.debug/vmlinux: 4.4.5
> vmcore kernel: 4.4.6
>
>
> Would really like to understand why this system crashed. I know I'm a bit
> behind on my kernel versions however, but I should be able to look at this
> kernel??
>
> Thanks
> Tory
It looks like the vmcore and vmlinux file don't match, like maybe the crashing
system was running the standard 2.6.32-220.el6.x86_64 kernel, and you're trying
to debug it using the 2.6.32-220.el6.x86_64.debug kernel variant?
First thing -- *never* use a System.map file unless for some reason you don't
have the original kernel's vmlinux available *and* you feel that the vmlinux
file you have is very close to the crashing kernel's vmlinux. Bit with any
RHEL standard (unmodified) vmlinux/vmcore setup, the System.map is completely
useless.
So the first question is: what kernel generated the vmcore?
Do this:
$ strings vmcore | grep '2.6.32'
Dave
--
Dave you are right, I thought I had to use the devel kernel and in fact my system is not running that, so it crashed with the standard 2.6.32-220.el6.x86_64 kernel.
[tblue@kvm7 127.0.0.1-2014-02-07-19:17:09]$ sudo strings vmcore | grep '2.6.32'
2.6.32-220.el6.x86_64
OSRELEASE=2.6.32-220.el6.x86_64
But it won't take my vmlinux from /boot
crash: /boot/vmlinuz-2.6.32-220.el6.x86_64: not a supported file format
Yes sir you were correct, I was using the wrong kernel!
please wait... (determining panic task)
WARNING: multiple active tasks have called die
KERNEL: /usr/lib/debug/lib/modules/2.6.32-220.el6.x86_64/vmlinux
DUMPFILE: /libvirt/crash/127.0.0.1-2014-02-07-19:17:09/vmcore [PARTIAL DUMP]
CPUS: 32
DATE: Fri Feb 7 18:16:05 2014
UPTIME: 226 days, 21:36:13
LOAD AVERAGE: 2.42, 2.68, 2.69
TASKS: 816
NODENAME: kvm7.domain.com
RELEASE: 2.6.32-220.el6.x86_64
VERSION: #1 SMP Tue Dec 6 19:48:22 GMT 2011
MACHINE: x86_64 (2200 Mhz)
MEMORY: 88 GB
PANIC: ""
PID: 0
COMMAND: "swapper"
TASK: ffff881665514b40 (1 of 32) [THREAD_INFO: ffff880c6124e000]
CPU: 19
STATE: TASK_RUNNING (PANIC)
Nothing stands out as s bug or reason to fail
divide error: 0000 [#1] SMP
last sysfs file: /sys/devices/system/cpu/cpu31/cache/index2/shared_cpu_map
CPU 19
Modules linked in: ext3 jbd ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter ip_tables sunrpc bridge stp llc bonding ipv6 vhost_net macvtap macvlan tun kvm_intel kvm cdc_ether usbnet mii microcode i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support shpchp igb ioatdma dca ses enclosure sg ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif ahci megaraid_sas dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
Pid: 0, comm: swapper Not tainted 2.6.32-220.el6.x86_64 #1 IBM System x3650 M4 -[7915AC1]-/00J6528
RIP: 0010:[<ffffffff81054ad5>] [<ffffffff81054ad5>] find_busiest_group+0x5c5/0xb20
RSP: 0018:ffff880028363c40 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff880028363e64 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8800282cf540 RDI: ffff8800282d5fc0
RBP: ffff880028363dd0 R08: ffff8800282cf860 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffff01
R13: 0000000000015fc0 R14: ffffffffffffffff R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff880028360000(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 00007f4e5215c000 CR3: 00000011bea54000 CR4: 00000000000426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 0, threadinfo ffff880c6124e000, task ffff881665514b40)
Stack:
ffff880028363d70 ffff880028363ce0 ffff880028363ca0 000000000000024d
<0> ffff8800282cf860 ffff880028363e58 0101881664b121a8 0000000600000000
<0> 0000000600000000 ffff8800282cf540 0000000123386cc0 0000000000000008
Call Trace:
<IRQ>
[<ffffffffa02e4669>] ? br_handle_frame_finish+0x179/0x2a0 [bridge]
[<ffffffff8105fc52>] rebalance_domains+0x1a2/0x5b0
[<ffffffff81060153>] run_rebalance_domains+0xf3/0x160
[<ffffffff8107c4f0>] ? get_next_timer_interrupt+0x1b0/0x250
[<ffffffff81072161>] __do_softirq+0xc1/0x1d0
[<ffffffff81097e0a>] ? sched_clock_idle_wakeup_event+0x1a/0x20
[<ffffffff8100c24c>] call_softirq+0x1c/0x30
[<ffffffff8100de85>] do_softirq+0x65/0xa0
[<ffffffff81071f45>] irq_exit+0x85/0x90
[<ffffffff8102a255>] smp_call_function_single_interrupt+0x35/0x40
[<ffffffff8100bdb3>] call_function_single_interrupt+0x13/0x20
<EOI>
[<ffffffff812c4a5e>] ? intel_idle+0xde/0x170
[<ffffffff812c4a41>] ? intel_idle+0xc1/0x170
[<ffffffff813f9f47>] cpuidle_idle_call+0xa7/0x140
[<ffffffff81009e06>] cpu_idle+0xb6/0x110
[<ffffffff814e5f23>] start_secondary+0x202/0x245
Code: d0 b8 01 00 00 00 48 c1 ea 0a 48 85 d2 0f 45 c2 41 89 40 08 66 90 4c 8b 85 e0 fe ff ff 48 8b 45 a8 31 d2 41 8b 48 08 48 c1 e0 0a <48> f7 f1 48 8b 4d b0 48 89 45 a0 31 c0 48 85 c9 74 0c 48 8b 45
RIP [<ffffffff81054ad5>] find_busiest_group+0x5c5/0xb20
RSP <ffff880028363c40>
Is there a forum that would help me figure out what exactly cause this crash as it's not the first time, across this series of servers running KVM
Thank you sir,
Tory
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