netdev - Re: IPv6 kernel warning

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Date:	Mon, 7 Oct 2013 11:13:37 -0700 (PDT)
From:	dormando <dormando@...ia.net>
To:	Yuchung Cheng <ycheng@...gle.com>
cc:	Michele Baldessari <michele@...syn.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	netdev <netdev@...r.kernel.org>
Subject: Re: IPv6 kernel warning

> >
> > there's been multiple reports about this one:
> > https://bugzilla.redhat.com/show_bug.cgi?id=989251
> > http://bugzilla.kernel.org/show_bug.cgi?id=60779
> >
> > Could you try Yuchung's debug patch?
> > http://www.spinics.net/lists/netdev/msg250193.html
> Yes it looks like the same bug. Please try that patch to help identify
> this elusive bug.
>

Hi!

We get this one a few times a day in production. Here's a warning with
your debug trace in the line immediately following:
(I censored a few things)

 [125311.721950] ------------[ cut here ]------------
 [125311.721961] WARNING: at net/ipv4/tcp_input.c:2776 tcp_fastretrans_alert+0xb58/0xc80()
 [125311.721962] Modules linked in: bridge ip_vs macvlan coretemp crc32_pclmul ghash_clmulni_intel gpio_ich ipmi_watchdog microcode ipmi_devintf sb_edac lpc_ich edac_core mfd_core ipmi_si ipmi_msghandler iptable_nat nf_nat_ipv4 nf_nat ixgbe igb mdio i2c_algo_bit ptp pps_core
 [125311.721981] CPU: 11 PID: 0 Comm: swapper/11 Not tainted 3.10.13 #1
 [125311.721982] Hardware name: Supermicro XXXXXXXXXXX, BIOS 1.1 10/03/2012
 [125311.721984]  ffffffff81a82007 ffff88407fc63958 ffffffff816bb9cc ffff88407fc63998
 [125311.721986]  ffffffff8104b940 00ff8840ad904f82 ffff883b8a165b00 0000000000004120
 [125311.721989]  0000000000000001 0000000000000019 0000000000000000 ffff88407fc639a8
 [125311.721991] Call Trace:
 [125311.721992]  <IRQ>  [<ffffffff816bb9cc>] dump_stack+0x19/0x1d
 [125311.722002]  [<ffffffff8104b940>] warn_slowpath_common+0x70/0xa0
 [125311.722005]  [<ffffffff8104b98a>] warn_slowpath_null+0x1a/0x20
 [125311.722007]  [<ffffffff81616db8>] tcp_fastretrans_alert+0xb58/0xc80
 [125311.722011]  [<ffffffff8161891f>] tcp_ack+0x6df/0xe90
 [125311.722016]  [<ffffffff8164e0ca>] ? ipt_do_table+0x22a/0x680
 [125311.722018]  [<ffffffff816194b3>] ? tcp_validate_incoming+0x63/0x320
 [125311.722021]  [<ffffffff8161a55c>] tcp_rcv_established+0x2cc/0x810
 [125311.722023]  [<ffffffff81622c84>] tcp_v4_do_rcv+0x254/0x4f0
 [125311.722025]  [<ffffffff816245ac>] tcp_v4_rcv+0x5fc/0x750
 [125311.722027]  [<ffffffff815ffa00>] ? ip_rcv+0x350/0x350
 [125311.722032]  [<ffffffff815df3ad>] ? nf_hook_slow+0x7d/0x160
 [125311.722034]  [<ffffffff815ffa00>] ? ip_rcv+0x350/0x350
 [125311.722036]  [<ffffffff815fface>] ip_local_deliver_finish+0xce/0x250
 [125311.722037]  [<ffffffff815ffc9c>] ip_local_deliver+0x4c/0x80
 [125311.722039]  [<ffffffff815ff329>] ip_rcv_finish+0x119/0x360
 [125311.722040]  [<ffffffff815ff8e0>] ip_rcv+0x230/0x350
 [125311.722046]  [<ffffffff815b4067>] __netif_receive_skb_core+0x477/0x600
 [125311.722049]  [<ffffffff815b4217>] __netif_receive_skb+0x27/0x70
 [125311.722051]  [<ffffffff815b4354>] process_backlog+0xf4/0x1e0
 [125311.722053]  [<ffffffff815b4b45>] net_rx_action+0xf5/0x250
 [125311.722056]  [<ffffffff81053a5f>] __do_softirq+0xef/0x270
 [125311.722058]  [<ffffffff81053cb5>] irq_exit+0x95/0xa0
 [125311.722062]  [<ffffffff816c8f26>] do_IRQ+0x66/0xe0
 [125311.722065]  [<ffffffff816bf62a>] common_interrupt+0x6a/0x6a
 [125311.722065]  <EOI>  [<ffffffff8100abf1>] ? default_idle+0x21/0xc0
 [125311.722082]  [<ffffffff8100a54f>] arch_cpu_idle+0xf/0x20
 [125311.722086]  [<ffffffff8108f353>] cpu_startup_entry+0xb3/0x230
 [125311.722091]  [<ffffffff816b439e>] start_secondary+0x1dc/0x1e3
 [125311.722093] ---[ end trace e77cd5ba583fcbe9 ]---
 [125311.722096] 355.355.1.355:22496 F0x4120 S1 s7 IF25+17-1-24f0 ur57 rr3 rt0 um0 hs23120 nxt23120

It's been happening with all 3.10 kernels, and the one above is .13 as
stated in the trace.
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