netdev - Re: kernel panic in fib_rules_lookup [2.6.27.7 vendor-patched]

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Date:	Thu, 21 Oct 2010 00:05:53 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joe Buehler <aspam@....net>
Cc:	netdev@...r.kernel.org
Subject: Re: kernel panic in fib_rules_lookup [2.6.27.7 vendor-patched]

Le mercredi 20 octobre 2010 à 13:43 -0400, Joe Buehler a écrit :
> Eric Dumazet wrote:
> 
> > 2.6.27 is a bit old, you might try :
> > 
> > commit 7fa7cb7109d07c29ab28bb877bc7049a0150dbe5
> > Author: Eric Dumazet <eric.dumazet@...il.com>
> > Date:   Mon Sep 27 04:18:27 2010 +0000
> 
> Alas, after more load testing I find that the panic still occurs:
> 
> CPU 1 Unable to handle kernel paging request at virtual address
> 0000000000000000, epc == ffffffff8146728c, ra == ffffffff81467258
> Oops[#1]:
> Cpu 1
> $ 0   : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> $ 4   : ffffffffffffffff a80000008c9d78f0 a80000009acd9880 000000000a205a7c
> $ 8   : 0000000000000000 0000000000000020 a80000009a9c49d0 0000000000000000
> $12   : ffffffff8155de00 0000000000000004 0000000000000001 0000000000000000
> $16   : 0000000000000000 a80000008c9d78f0 0000000000000002 a80000009b94ed80
> $20   : a80000009b94edf8 0000000000000000 0000000000000003 a80000008c9d78a0
> $24   : 0000000000000000 ffffffff812df388
> $28   : a80000008c9d4000 a80000008c9d7840 fffffffffffffff5 ffffffff81467258
> Hi    : 0000000000000000
> Lo    : 0000000000000000
> epc   : ffffffff8146728c fib_rules_lookup+0x11c/0x260
>     Not tainted
> ra    : ffffffff81467258 fib_rules_lookup+0xe8/0x260
> Status: 1010cce3    KX SX UX KERNEL EXL IE
> Cause : 00800008
> BadVA : 0000000000000000
> PrId  : 000d0409 (Cavium Octeon)
> Modules linked in: x_tables ip_tables iptable_filter nf_conntrack
> nf_conntrack_ipv4 nf_nat iptable_nat tun xt_tcpudp xt_state ipt_REJECT
> ipv6 ip6_tables ip6table_filter ip6t_ipv6header ip6t_REJECT
> Process qscope7500 (pid: 1343, threadinfo=a80000008c9d4000,
> task=a80000008c068ac0, tls=000000002d51e920)
> Stack : ffffffffffffffff 0000000000000003 a80000008c9d78d8 a80000008c9d79d8
>         a80000008c9d78f0 0000000000000000 ffffffff816c39c0 ffffffffffffffff
>         0000000000000003 00000000000004a6 0000000000000000 ffffffff814bd2a4
>         0000000000000000 a80000008c9d78d8 0000000000000000 ffffffffc001aa24
>         a80000008c9d78d8 ffffffff81478a38 0000000000000003 0000000000000001
>         0000000000000000 0000000000000000 0000000000000001 000000000a205a7c
>         0a2059bf00000000 0000000000000000 0000000000000000 0000000000000000
>         0000000000000000 0000000000000000 a80000008c9d79d0 0000000000000000
>         a80000008c9d79d8 a8000000994ff380 0000000000000000 0000000000000000
>         a80000008c9d79d0 ffffffff816c39c0 0000000000000003 00000000000004a6
>         ...
> Call Trace:
> [<ffffffff8146728c>] fib_rules_lookup+0x11c/0x260
> [<ffffffff814bd2a4>] fib_lookup+0x2c/0x48
> [<ffffffff81478a38>] __ip_route_output_key+0x918/0xf38
> [<ffffffff81479090>] ip_route_output_flow+0x38/0x2e8
> [<ffffffff81482c44>] ip_queue_xmit+0x38c/0x3a8
> [<ffffffff81497f5c>] tcp_transmit_skb+0x3f4/0x7d0
> [<ffffffff8149af2c>] __tcp_push_pending_frames+0x1fc/0x9e0
> [<ffffffff8148cf50>] tcp_sendmsg+0x900/0xe00
> [<ffffffff81441f7c>] sock_aio_write+0x16c/0x190
> [<ffffffff811d0424>] do_sync_write+0xbc/0x130
> [<ffffffff811d10a8>] vfs_write+0x150/0x158
> [<ffffffff811d124c>] sys_write+0x5c/0x118
> [<ffffffff8114532c>] handle_sys+0x12c/0x148
> 
> 
> Code: 0040282d  00000000  de100000 <de020000> cc400000  1614ffce
> 00000000  2405fffd  dfbf0058
> Fatal exception: panic in 5 seconds
> Kernel panic - not syncing: Fatal exception
> Rebooting in 1 seconds..

Thanks Joe

Could you provide a disassembly of function fib_rules_lookup ?



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