From mboxrd@z Thu Jan 1 00:00:00 1970 From: dormando Subject: Re: IPv6 kernel warning Date: Mon, 7 Oct 2013 11:13:37 -0700 (PDT) Message-ID: References: <20130920131153.GF12758@n2100.arm.linux.org.uk> <20130920160830.GA4241@marquez.int.rhx> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Michele Baldessari , Russell King - ARM Linux , netdev To: Yuchung Cheng Return-path: Received: from rydia.net ([69.46.88.68]:41614 "EHLO mail.rydia.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751475Ab3JGSZJ (ORCPT ); Mon, 7 Oct 2013 14:25:09 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: > > > > 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] [] dump_stack+0x19/0x1d [125311.722002] [] warn_slowpath_common+0x70/0xa0 [125311.722005] [] warn_slowpath_null+0x1a/0x20 [125311.722007] [] tcp_fastretrans_alert+0xb58/0xc80 [125311.722011] [] tcp_ack+0x6df/0xe90 [125311.722016] [] ? ipt_do_table+0x22a/0x680 [125311.722018] [] ? tcp_validate_incoming+0x63/0x320 [125311.722021] [] tcp_rcv_established+0x2cc/0x810 [125311.722023] [] tcp_v4_do_rcv+0x254/0x4f0 [125311.722025] [] tcp_v4_rcv+0x5fc/0x750 [125311.722027] [] ? ip_rcv+0x350/0x350 [125311.722032] [] ? nf_hook_slow+0x7d/0x160 [125311.722034] [] ? ip_rcv+0x350/0x350 [125311.722036] [] ip_local_deliver_finish+0xce/0x250 [125311.722037] [] ip_local_deliver+0x4c/0x80 [125311.722039] [] ip_rcv_finish+0x119/0x360 [125311.722040] [] ip_rcv+0x230/0x350 [125311.722046] [] __netif_receive_skb_core+0x477/0x600 [125311.722049] [] __netif_receive_skb+0x27/0x70 [125311.722051] [] process_backlog+0xf4/0x1e0 [125311.722053] [] net_rx_action+0xf5/0x250 [125311.722056] [] __do_softirq+0xef/0x270 [125311.722058] [] irq_exit+0x95/0xa0 [125311.722062] [] do_IRQ+0x66/0xe0 [125311.722065] [] common_interrupt+0x6a/0x6a [125311.722065] [] ? default_idle+0x21/0xc0 [125311.722082] [] arch_cpu_idle+0xf/0x20 [125311.722086] [] cpu_startup_entry+0xb3/0x230 [125311.722091] [] 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.