Kernel is panicking?

I got linode outage for 2 hours, solved it with restart, linode support says it is php service crash and that my kernel started to panic :-) don't know why it is panicking when all you need is to restart :-) joking. Aynway this is first time for this ever, wondering what could be the cause, which logs file to look? i checked var/log/apache2/error.log and there is nothing, this is from my lish console

NFO: rcu_sched self-detected stall on CPU
3: (2910498 ticks this GP) idle=1c3/140000000000001/0
(t=2940058 jiffies)
Pid: 19638, comm: php5 Tainted: G B D 3.6.5-linode47 #1

[<c01938dd>] ? acct_update_integrals+0x7d/0x130
[<c019204a>] ? __rcu_pending+0xca/0x1b0
[<c01921ef>] ? rcu_check_callbacks+0xbf/0xe0
[<c013e9b5>] ? update_process_times+0x35/0x70
[<c016dbed>] ? tick_sched_timer+0x6d/0xc0
[<c0150db5>] ? __remove_hrtimer+0x45/0xa0
[<c016db80>] ? tick_nohz_handler+0xe0/0xe0
[<c0150f3d>] ? __run_hrtimer+0x4d/0xf0
[<c01513b9>] ? hrtimer_interrupt+0x119/0x2f0
[<c0106887>] ? xen_timer_interrupt+0x17/0x30
[<c018b92f>] ? handle_irq_event_percpu+0x3f/0x150
[<c018ddc5>] ? irq_get_irq_data+0x5/0x10
[<c04e7765>] ? info_for_irq+0x5/0x20
[<c04e7f00>] ? evtchn_from_irq+0x10/0x40
[<c018e081>] ? handle_percpu_irq+0x31/0x50
[<c04e7622>] ? __xen_evtchn_do_upcall+0x162/0x210
[<c04e8a18>] ? xen_evtchn_do_upcall+0x18/0x30
[<c076d887>] ? xen_do_upcall+0x7/0xc
[<c018007b>] ? cpuset_attach+0x17b/0x180
[<c04e00d8>] ? raid6_sse11_gen_syndrome+0xe8/0x100
[<c01013a7>] ? hypercall_page+0x3a7/0x1000
[<c04e7f77>] ? xen_poll_irq_timeout+0x47/0x60
[<c0108245>] ? xen_spin_lock_slow+0x65/0xd0
[<c010830c>] ? xen_spin_lock_flags+0x5c/0x70
[<c076c957>] ? _raw_spin_lock_irqsave+0x27/0x40
[<c01a8e7d>] ? pagevec_lru_move_fn+0x5d/0xb0
[<c01a87b0>] ? pagevec_lookup+0x20/0x20
[<c01a9011>] ? lru_add_drain_cpu+0x61/0xc0
[<c01bd5fb>] ? unmap_region+0x2b/0xc0
[<c01be979>] ? __split_vma+0xd9/0x180
[<c01bebeb>] ? do_munmap+0x1cb/0x2a0
[<c01becf7>] ? vm_munmap+0x37/0x60
[<c076cc21>] ? syscall_call+0x7/0xb
[<c0760000>] ? ceph_str_hash_linux+0x40/0x40</c0760000></c076cc21></c01becf7></c01bebeb></c01be979></c01bd5fb></c01a9011></c01a87b0></c01a8e7d></c076c957></c010830c></c0108245></c04e7f77></c01013a7></c04e00d8></c018007b></c076d887></c04e8a18></c04e7622></c018e081></c04e7f00></c04e7765></c018ddc5></c018b92f></c0106887></c01513b9></c0150f3d></c016db80></c0150db5></c016dbed></c013e9b5></c01921ef></c019204a></c01938dd> 

1 Reply

Got same error, but in swapper, exactly a hour after a few-minutes-long outage that I assumed to be a network outage.

Yes, the binary junk on the (1GPs behind) line was real binary junk.

kernel: INFO: rcu_bh self-detected stall on CPU
kernel:         3: (1 GPs behind) idle=1a9/1/0  /^UGûÊrâÿÿÿÿ<Ìò
kernel:          (t=0 jiffies)
kernel: Pid: 0, comm: swapper/3 Not tainted 3.5.2-linode45 #1
kernel: Call Trace:
kernel: [<c018ccba>] ? print_cpu_stall+0xda/0x190
kernel: [<c01215d7>] ? pvclock_clocksource_read+0xf7/0x190
kernel: [<c01215d7>] ? pvclock_clocksource_read+0xf7/0x190
kernel: [<c018ce3a>] ? __rcu_pending+0xca/0x1a0
kernel: [<c018cfd3>] ? rcu_check_callbacks+0xc3/0xd0
kernel: [<c013ac05>] ? update_process_times+0x35/0x70
kernel: [<c0168cf9>] ? tick_sched_timer+0x59/0xb0
kernel: [<c014c6d5>] ? __remove_hrtimer+0x45/0xa0
kernel: [<c0168ca0>] ? tick_nohz_handler+0xe0/0xe0
kernel: [<c014c85d>] ? __run_hrtimer+0x4d/0xf0
kernel: [<c014ccd9>] ? hrtimer_interrupt+0x119/0x2f0
kernel: [<c0106677>] ? xen_timer_interrupt+0x17/0x30
kernel: [<c0186aef>] ? handle_irq_event_percpu+0x3f/0x150
kernel: [<c0188f65>] ? irq_get_irq_data+0x5/0x10
kernel: [<c04c3e05>] ? info_for_irq+0x5/0x20
kernel: [<c04c45a0>] ? evtchn_from_irq+0x10/0x40
kernel: [<c0189221>] ? handle_percpu_irq+0x31/0x50
kernel: [<c04c3cc2>] ? __xen_evtchn_do_upcall+0x162/0x210
kernel: [<c04c50b8>] ? xen_evtchn_do_upcall+0x18/0x30
kernel: [<c072edc7>] ? xen_do_upcall+0x7/0xc
kernel: [<c01013a7>] ? hypercall_page+0x3a7/0x1000
kernel: [<c010606f>] ? xen_safe_halt+0xf/0x20
kernel: [<c011006c>] ? default_idle+0x1c/0x40
kernel: [<c011028a>] ? cpu_idle+0x4a/0x80</c011028a></c011006c></c010606f></c01013a7></c072edc7></c04c50b8></c04c3cc2></c0189221></c04c45a0></c04c3e05></c0188f65></c0186aef></c0106677></c014ccd9></c014c85d></c0168ca0></c014c6d5></c0168cf9></c013ac05></c018cfd3></c018ce3a></c01215d7></c01215d7></c018ccba>


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