Date:	Fri, 13 May 2011 10:20:50 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	TB <lkml@...hboom.com>
CC:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: kernel BUG at net/ipv4/tcp_output.c:1006!

On 05/13/2011 10:11 AM, TB wrote:
> This is the 2.6.38.5 kernel with the patch in
> [PATCH] tcp_cubic: limit delayed_ack ratio to prevent divide error
>
> Had this crash a few days ago, but never got any response to subsequent
> emails. Another server crashed today with a network related backtrace,
> but netconsole did not work.

We've seen some funny things with the in-kernel igb driver.

Not crashes, but just strange performance issues and CRC errors
on the wire and such.  Intel's igb driver seems to work fine
for us.

If you have no other things to try..you might try using the
out-of-kernel igb driver from Intel and see if that makes
any difference.

Thanks,
Ben

>
> The network switch is a
> HP ProCurve J9147A 2910al-48G Switch, revision W.14.49, ROM W.14.04
>
> MTU is set at 1500
> No firewall rules in the filter chain
> No mangle or NAT loaded or compiled in the kernel.
> Bonding on 2 igb gigabit ethernet is activated.
> Network traffic was at 700mbit and 900mbit in each instance.
>
> [405542.454073] ------------[ cut here ]------------
> [405542.454109] kernel BUG at net/ipv4/tcp_output.c:1006!
> [405542.454136] invalid opcode: 0000 [#1]
>
> [405542.454166] last sysfs file:
> /sys/devices/pci0000:00/0000:00:1f.2/host6/scsi_host/host6/proc_name
> [405542.454213] CPU 0
>
> [405542.454220] Modules linked in:
>   i2c_i801
>   evdev
>   i2c_core
>   button
>   [last unloaded: scsi_wait_scan]
>
> [405542.454300]
> [405542.454320] Pid: 0, comm: swapper Not tainted 2.6.38.5 #8
>
> /
>
> [405542.454379] RIP: 0010:[<ffffffff814e7ed2>]
>   [<ffffffff814e7ed2>] tcp_fragment+0x22/0x29a
> [405542.454433] RSP: 0018:ffff8800bf403a30  EFLAGS: 00010202
> [405542.454460] RAX: ffff88000cd35000 RBX: ffff88006b84f480 RCX:
> 0000000000000218
> [405542.454504] RDX: 0000000000001708 RSI: ffff88006b84f480 RDI:
> ffff880008d6b200
> [405542.454548] RBP: 0000000000001540 R08: 0000000000000002 R09:
> 000000001027984a
> [405542.454592] R10: ffff8800b915f428 R11: ffff880008d6b200 R12:
> ffff88006b84f4a8
> [405542.454636] R13: 0000000000001708 R14: 0000000000000000 R15:
> ffff880008d6b200
> [405542.454680] FS:  0000000000000000(0000) GS:ffff8800bf400000(0000)
> knlGS:0000000000000000
> [405542.454726] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [405542.454754] CR2: 00007f94055c7000 CR3: 000000083e0bd000 CR4:
> 00000000000006f0
> [405542.454798] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [405542.454842] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> 0000000000000400
> [405542.454886] Process swapper (pid: 0, threadinfo ffffffff8176c000,
> task ffffffff81777020)
> [405542.454931] Stack:
> [405542.454951]  0000000000000000
>   0000021808d6b798
>   00000002000005b4
>   ffff88006b84f480
>
> [405542.455006]  ffff880008d6b200
>   ffff88006b84f4a8
>   0000000000000015
>   0000000000000000
>
> [405542.455061]  ffff880008d6b300
>   ffffffff814df7a4
>   ffff8802a3965140
>   00000000000001a0
>
> [405542.455115] Call Trace:
> [405542.455137]<IRQ>
>
> [405542.455162]  [<ffffffff814df7a4>] ? tcp_mark_head_lost+0x13c/0x202
> [405542.455192]  [<ffffffff814e33a8>] ? tcp_ack+0xe98/0x1a89
> [405542.455220]  [<ffffffff814e42ca>] ? tcp_validate_incoming+0x69/0x290
> [405542.455250]  [<ffffffff814e4c9b>] ? tcp_rcv_established+0x7aa/0xa13
> [405542.455281]  [<ffffffff814ec60b>] ? tcp_v4_do_rcv+0x1b2/0x382
> [405542.455310]  [<ffffffff814c95d4>] ? nf_iterate+0x40/0x78
> [405542.455338]  [<ffffffff814ecc5f>] ? tcp_v4_rcv+0x484/0x797
> [405542.455368]  [<ffffffff814d11c7>] ? ip_local_deliver_finish+0xab/0x139
> [405542.455398]  [<ffffffff814ae2b3>] ? __netif_receive_skb+0x31c/0x349
> [405542.455428]  [<ffffffff814aec82>] ? netif_receive_skb+0x67/0x6d
> [405542.455457]  [<ffffffff814af1fb>] ? napi_gro_receive+0x9d/0xab
> [405542.455485]  [<ffffffff814aed57>] ? napi_skb_finish+0x1c/0x31
> [405542.455516]  [<ffffffff813e4248>] ? igb_poll+0x7d5/0xb2e
> [405542.455544]  [<ffffffff813e432f>] ? igb_poll+0x8bc/0xb2e
> [405542.455572]  [<ffffffff813e211a>] ? igb_msix_ring+0x6e/0x75
> [405542.455602]  [<ffffffff8106749c>] ? handle_IRQ_event+0x51/0x119
> [405542.455631]  [<ffffffff814af337>] ? net_rx_action+0xa7/0x212
> [405542.455661]  [<ffffffff8103b6c2>] ? __do_softirq+0xbe/0x184
> [405542.455690]  [<ffffffff8100364c>] ? call_softirq+0x1c/0x28
> [405542.455719]  [<ffffffff81005085>] ? do_softirq+0x31/0x63
> [405542.455746]  [<ffffffff8103b56c>] ? irq_exit+0x36/0x78
> [405542.455773]  [<ffffffff81004784>] ? do_IRQ+0x98/0xae
> [405542.455802]  [<ffffffff81562ed3>] ? ret_from_intr+0x0/0xe
> [405542.455829]<EOI>
>
> [405542.455860]  [<ffffffff81009a41>] ? mwait_idle+0xb9/0xf3
> [405542.455888]  [<ffffffff81001c6e>] ? cpu_idle+0x57/0x8d
> [405542.455921]  [<ffffffff81801c49>] ? start_kernel+0x34e/0x35a
> [405542.455950]  [<ffffffff81801398>] ? x86_64_start_kernel+0xf3/0xf9
> [405542.455977] Code:
> f>
>
> [405542.456239] RIP
>   [<ffffffff814e7ed2>] tcp_fragment+0x22/0x29a
> [405542.456270]  RSP<ffff8800bf403a30>
> [405542.456543] ---[ end trace 231aaa222f893065 ]---
> [405542.456600] Kernel panic - not syncing: Fatal exception in interrupt
> [405542.456659] Pid: 0, comm: swapper Tainted: G      D     2.6.38.5 #8
> [405542.456719] Call Trace:
> [405542.456770]<IRQ>
>   [<ffffffff81560960>] ? panic+0x9d/0x1a0
> [405542.456863]  [<ffffffff81562ed3>] ? ret_from_intr+0x0/0xe
> [405542.456923]  [<ffffffff810365bb>] ? kmsg_dump+0x46/0xec
> [405542.456981]  [<ffffffff81006176>] ? oops_end+0x9f/0xac
> [405542.457039]  [<ffffffff81003f83>] ? do_invalid_op+0x85/0x8f
> [405542.457097]  [<ffffffff814e7ed2>] ? tcp_fragment+0x22/0x29a
> [405542.457156]  [<ffffffff814e80a9>] ? tcp_fragment+0x1f9/0x29a
> [405542.457216]  [<ffffffff810033d5>] ? invalid_op+0x15/0x20
> [405542.457276]  [<ffffffff814e7ed2>] ? tcp_fragment+0x22/0x29a
> [405542.457337]  [<ffffffff814df7a4>] ? tcp_mark_head_lost+0x13c/0x202
> [405542.457400]  [<ffffffff814e33a8>] ? tcp_ack+0xe98/0x1a89
> [405542.457461]  [<ffffffff814e42ca>] ? tcp_validate_incoming+0x69/0x290
> [405542.457524]  [<ffffffff814e4c9b>] ? tcp_rcv_established+0x7aa/0xa13
> [405542.457586]  [<ffffffff814ec60b>] ? tcp_v4_do_rcv+0x1b2/0x382
> [405542.457645]  [<ffffffff814c95d4>] ? nf_iterate+0x40/0x78
> [405542.457703]  [<ffffffff814ecc5f>] ? tcp_v4_rcv+0x484/0x797
> [405542.457761]  [<ffffffff814d11c7>] ? ip_local_deliver_finish+0xab/0x139
> [405542.457827]  [<ffffffff814ae2b3>] ? __netif_receive_skb+0x31c/0x349
> [405542.457894]  [<ffffffff814aec82>] ? netif_receive_skb+0x67/0x6d
> [405542.457953]  [<ffffffff814af1fb>] ? napi_gro_receive+0x9d/0xab
> [405542.458021]  [<ffffffff814aed57>] ? napi_skb_finish+0x1c/0x31
> [405542.458080]  [<ffffffff813e4248>] ? igb_poll+0x7d5/0xb2e
> [405542.458138]  [<ffffffff813e432f>] ? igb_poll+0x8bc/0xb2e
> [405542.458196]  [<ffffffff813e211a>] ? igb_msix_ring+0x6e/0x75
> [405542.458254]  [<ffffffff8106749c>] ? handle_IRQ_event+0x51/0x119
> [405542.458313]  [<ffffffff814af337>] ? net_rx_action+0xa7/0x212
> [405542.458371]  [<ffffffff8103b6c2>] ? __do_softirq+0xbe/0x184
> [405542.458430]  [<ffffffff8100364c>] ? call_softirq+0x1c/0x28
> [405542.458488]  [<ffffffff81005085>] ? do_softirq+0x31/0x63
> [405542.458545]  [<ffffffff8103b56c>] ? irq_exit+0x36/0x78
> [405542.458602]  [<ffffffff81004784>] ? do_IRQ+0x98/0xae
> [405542.458660]  [<ffffffff81562ed3>] ? ret_from_intr+0x0/0xe
> [405542.458717]<EOI>
>   [<ffffffff81009a41>] ? mwait_idle+0xb9/0xf3
> [405542.458810]  [<ffffffff81001c6e>] ? cpu_idle+0x57/0x8d
> [405542.458867]  [<ffffffff81801c49>] ? start_kernel+0x34e/0x35a
> [405542.458926]  [<ffffffff81801398>] ? x86_64_start_kernel+0xf3/0xf9
>
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-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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