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    Subjectkernel 2.6.37 : oops in cleanup_once
    Hello.
    We recently upgraded one machine with vanilla 2.6.37, and experienced 2
    kernel oops since. Each oops is after ~1 week of uptime.
    The last oops was last night but we didn't had any trace.

    Here is the previous oops :

    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316042]
    BUG: unable to handle kernel NULL pointer dereference at 000000000000000d
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316096]
    IP: [<ffffffff8130e6bf>] cleanup_once+0x3f/0xa0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316135] PGD 0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316157]
    Oops: 0002 [#1] SMP
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316188]
    last sysfs file: /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316234] CPU 1
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316240]
    Modules linked in: xt_physdev ip6t_LOG nf_conntrack_ipv6 nf_defrag_ipv6
    ipt_LOG xt_multiport xt_limit nf_conntrack_tftp nf_conntrack_ftp tun
    ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat
    nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT
    xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm ipv6 8021q
    bridge stp ext2 mbcache fuse snd_pcm snd_timer snd soundcore
    snd_page_alloc i5000_edac edac_core psmouse evdev i5k_amb tpm_tis tpm
    joydev dcdbas tpm_bios pcspkr rng_core ghes shpchp serio_raw pci_hotplug
    processor hed button thermal_sys xfs exportfs dm_mod sg sr_mod sd_mod
    cdrom usbhid hid usb_storage qla2xxx scsi_transport_fc scsi_tgt uhci_hcd
    mptsas mptscsih ehci_hcd mptbase bnx2 scsi_transport_sas scsi_mod [last
    unloaded: scsi_wait_scan]
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316694]
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316715]
    Pid: 0, comm: kworker/0:0 Not tainted 2.6.37-dsiun-110105 #17
    0MY736/PowerEdge M600
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316761]
    RIP: 0010:[<ffffffff8130e6bf>] [<ffffffff8130e6bf>] cleanup_once+0x3f/0xa0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316808]
    RSP: 0018:ffff8800cfc43e20 EFLAGS: 00010202
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316834]
    RAX: ffff8803d3158018 RBX: ffff8803d3158000 RCX: 0000000000000005
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.316878]
    RDX: 0b000209f1beadde RSI: 00000000000000ac RDI: ffffffff8152a970
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318512]
    RBP: 00000000000248f6 R08: 00000000003d0900 R09: 0000000000000000
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318560]
    R10: dead000000200200 R11: 0000000000000000 R12: ffff8800cfc43ea0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318604]
    R13: 0000000000000100 R14: ffff88040fc99fd8 R15: 0000000000000000
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318652]
    FS: 0000000000000000(0000) GS:ffff8800cfc40000(0000) knlGS:0000000000000000
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318698]
    CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318725]
    CR2: 000000000000000d CR3: 00000000014f1000 CR4: 00000000000026e0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318768]
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318812]
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318855]
    Process kworker/0:0 (pid: 0, threadinfo ffff88040fc98000, task
    ffff88040fc6c2e0)
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318901]
    Stack:
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318921]
    0000000000000082 00000001029221c1 00000000000248f6 ffffffff8130e988
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.318971]
    ffff88040fc90000 ffff88040fc90000 ffffffff8152a9a0 ffffffff8105e95f
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319021]
    ffff8800cfc43e58 ffff88040fc91020 ffffffff8130e950 ffff88040fc99fd8
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319072]
    Call Trace:
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319093] <IRQ>
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319116]
    [<ffffffff8130e988>] ? peer_check_expire+0x38/0x110
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319146]
    [<ffffffff8105e95f>] ? run_timer_softirq+0x16f/0x350
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319175]
    [<ffffffff8130e950>] ? peer_check_expire+0x0/0x110
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319204]
    [<ffffffff81079c6b>] ? ktime_get+0x5b/0xe0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319232]
    [<ffffffff8105685a>] ? __do_softirq+0xaa/0x1e0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319260]
    [<ffffffff81003ddc>] ? call_softirq+0x1c/0x30
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319288]
    [<ffffffff81005f75>] ? do_softirq+0x65/0xa0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319315]
    [<ffffffff81056745>] ? irq_exit+0x85/0x90
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319343]
    [<ffffffff8102137a>] ? smp_apic_timer_interrupt+0x6a/0xa0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319373]
    [<ffffffff81003893>] ? apic_timer_interrupt+0x13/0x20
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319401] <EOI>
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319427]
    [<ffffffffa032218c>] ? acpi_idle_enter_bm+0x243/0x27b [processor]
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319473]
    [<ffffffffa0322185>] ? acpi_idle_enter_bm+0x23c/0x27b [processor]
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319519]
    [<ffffffff812c0deb>] ? cpuidle_idle_call+0x8b/0x140
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319547]
    [<ffffffff8100208a>] ? cpu_idle+0x6a/0xf0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319573]
    Code: 00 48 8b 05 c4 c2 21 00 48 3d 60 a9 52 81 74 5c 48 8d 58 e8 48 8b
    15 11 02 24 00 2b 53 28 48 39 ea 72 49 48 8b 4b 18 48 8b 53 20 <48> 89
    51 08 48 89 0a 48 89 43 18 48 89 43 20 f0 ff 40 14 48 c7
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319768]
    RIP [<ffffffff8130e6bf>] cleanup_once+0x3f/0xa0
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319797]
    RSP <ffff8800cfc43e20>
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.319820]
    CR2: 000000000000000d
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320187]
    ---[ end trace eaf3ed2d46c78768 ]---
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320257]
    Kernel panic - not syncing: Fatal exception in interrupt
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320329]
    Pid: 0, comm: kworker/0:0 Tainted: G D 2.6.37-dsiun-110105 #17
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320418]
    Call Trace:
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320481]
    <IRQ> [<ffffffff8137c75e>] ? panic+0x92/0x1a2
    Jan 21 13:15:41 linkwood.u11.univ-nantes.prive kernel: [172825.320601]
    [<ffffffff81007357>] ? oops_end+0xe7/0xf0


    Any ideas ??

    This machine is running lots of kvm hosts. I can provide the .config if
    needed.

    --
    Yann Dupont - Service IRTS, DSI Université de Nantes
    Tel : 02.53.48.49.20 - Mail/Jabber : Yann.Dupont@univ-nantes.fr

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