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    SubjectRe: Kernel oops when clearing bgp neighbor info with TCP MD5SUM enabled


    Once upon a time, like on 09-10-17 10:57 AM, Anirban Sinha wrote:
    > On Thu, 8 Oct 2009, David Miller wrote:
    >
    >>>>> We are noticing a kernel OOPS on 2.6.26 kernel when we issue the command
    >>>>> "clear ip bgp <bgp-peer-ip>" on Quagga BGP routing software.

    and btw, this is the crash (on mips) we are talking about:

    # [23:10:35.108808] Kernel bug detected[#1]:
    [23:10:35.112527] Cpu 0
    [23:10:35.114676] $ 0 : 0000000000000000 0000000014001fe0
    0000000000000066 0000000000000004
    [23:10:35.122845] $ 4 : ffffffff80516c10 0000000014001fe0
    ffffffff8050c010 0000000000000004
    [23:10:35.131015] $ 8 : 0000000000000000 0000000000000041
    ffffffff805142e8 0000000000000001
    [23:10:35.139184] $12 : ffffffff80600000 ffffffff805f0000
    0000000000000064 0000000000000190
    [23:10:35.147354] $16 : 0000000000000102 ffffffff803afdf0
    ffffffff80539040 ffffffff80600780
    [23:10:35.155526] $20 : ffffffff80540000 0000000000200200
    ffffffff804c0000 000000000000000a
    [23:10:35.163695] $24 : a3d70a3d70a3d70b 8000000000000003
    [23:10:35.171865] $28 : ffffffff8050c000 ffffffff8050fd90
    9000000010030000 ffffffff801487a8
    [23:10:35.180035] Hi : 0000000000000000
    [23:10:35.183819] Lo : 0000000000000000
    [23:10:35.187603] epc : ffffffff801487a8 run_timer_softirq+0x198/0x258
    Tainted: P
    [23:10:35.196032] ra : ffffffff801487a8 run_timer_softirq+0x198/0x258
    [23:10:35.202395] Status: 14001fe3 KX SX UX KERNEL EXL IE
    [23:10:35.207814] Cause : 00808024
    [23:10:35.210911] PrId : 01041100 (SiByte SB1A)
    [23:10:35.215209] Modules linked in: xt_state ipt_REJECT iptable_filter
    nf_conntrack_ftp ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4
    ip_tables ebtable_filter ebtables bridge llc zeug_ipmcdrv(P) irqdisp(P)
    zvirt(P) zeugmod(P) softdog
    [23:10:35.236024] Process swapper (pid: 0, threadinfo=ffffffff8050c000,
    task=ffffffff805142e8, tls=0000000000000000)
    [23:10:35.246169] Stack : ffffffff8050fd90 ffffffff8050fd90
    0000000014001fe0 ffffffff805ff3e0
    [23:10:35.254166] ffffffff806003c4 0000000000000001
    ffffffff8053f650 ffffffff805706d0
    [23:10:35.262337] ffffffff80572020 ffffffff80142280
    ffffffff806003c0 0000000000000000
    [23:10:35.270507] 0000000014001fe0 000000000000c5b0
    ffffffff8fefc520 ffffffff8feea52c
    [23:10:35.278676] 0000000000000015 0000000000004460
    0000000000000940 ffffffff8fe1bf00
    [23:10:35.286846] ffffffff8fffdab0 ffffffff80142410
    0000000000000000 ffffffff80142778
    [23:10:35.295017] ffffffff80103d20 ffffffff80103d20
    0000000000000000 0000000014001fe1
    [23:10:35.303187] 0000000000040000 ffffffff8050c010
    0000000000000000 a80000017f87c138
    [23:10:35.311357] 0000000014001fe0 ffffffffffff00fe
    0000000000000004 a80000017e7e0680
    [23:10:35.319528] 0000000000000000 000000000000001d
    ffffffff8050ffe0 0000000000001f00
    [23:10:35.327696] ...
    [23:10:35.330536] Call Trace:
    [23:10:35.333201] [<ffffffff801487a8>] run_timer_softirq+0x198/0x258
    [23:10:35.339224] [<ffffffff80142280>] __do_softirq+0x198/0x288
    [23:10:35.344812] [<ffffffff80142410>] do_softirq+0xa0/0xa8
    [23:10:35.350057] [<ffffffff80142778>] irq_exit+0x70/0x88
    [23:10:35.355131] [<ffffffff80103d20>] ret_from_irq+0x0/0x4
    [23:10:35.360377] [<ffffffff801063f4>] cpu_idle+0x1c/0x88
    [23:10:35.365455]
    [23:10:35.367171]
    [23:10:35.367174] Code: 0040382d 0c04ef4c 00000000 <0200000d> 0c10ee9c
    0260202d dfa60000 17a6ffe5 00000000
    [23:10:35.378822] Kernel panic - not syncing: Fatal exception in
    interrupt



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