From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756456Ab3LSNgw (ORCPT ); Thu, 19 Dec 2013 08:36:52 -0500 Received: from mail.southpole.se ([37.247.8.11]:46046 "EHLO mail.southpole.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756285Ab3LSNgs (ORCPT ); Thu, 19 Dec 2013 08:36:48 -0500 Message-ID: <52B2F668.2030400@southpole.se> Date: Thu, 19 Dec 2013 14:36:40 +0100 From: Jonas Bonn User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: "linux-kernel@vger.kernel.org" , netdev@vger.kernel.org Subject: Lockdep warning Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Assp-Version: 2.3.3(13335) on assp.southpole.se X-Assp-ID: assp.southpole.se 60200-09453 X-Assp-Session: 7F3FC39682B0 (mail 1) X-Assp-Client-TLS: yes X-Assp-Server-TLS: yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Here's a lockdep warning that I'm seeing on an MX28 with 3.13-rc4. This seems to happen as soon as the network link comes up... including the 'netdev' list here as the backtrace shows the FEC driver in the stacktrace. Any advice on how to proceed to track this down appreciated... /Jonas [ 37.140857] fec 800f0000.ethernet eth0: Freescale FEC PHY driver [Generic PHY] (mii_bus:phy_addr=800f0000.etherne:00, irq=-1) [ 37.148951] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 39.155538] libphy: 800f0000.etherne:00 - Link is Up - 100/Full [ 39.162273] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 41.167998] [ 41.169546] ================================= [ 41.173925] [ INFO: inconsistent lock state ] [ 41.178308] 3.13.0-rc4-00018-g3b78c2f-dirty #8 Not tainted [ 41.183808] --------------------------------- [ 41.188182] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. [ 41.194213] connmand/337 [HC0[0]:SC1[1]:HE1:SE0] takes: [ 41.199452] (&(&sk->sk_dst_lock)->rlock){+.?...}, at: [] __udp4_lib_rcv+0x7e0/0x8a8 [ 41.208175] {SOFTIRQ-ON-W} state was registered at: [ 41.213071] [] __lock_acquire+0x5d0/0x1a64 [ 41.218274] [] lock_acquire+0x9c/0x104 [ 41.223115] [] _raw_spin_lock+0x28/0x38 [ 41.228052] [] ip6_datagram_connect+0x258/0x43c [ 41.233669] [] inet_dgram_connect+0x58/0x84 [ 41.238945] [] SyS_connect+0x64/0x8c [ 41.243610] [] ret_fast_syscall+0x0/0x44 [ 41.248629] irq event stamp: 70302 [ 41.252050] hardirqs last enabled at (70302): [] __getnstimeofday+0x15c/0x178 [ 41.260193] hardirqs last disabled at (70301): [] __getnstimeofday+0x28/0x178 [ 41.268243] softirqs last enabled at (70208): [] __do_softirq+0x198/0x2c4 [ 41.276049] softirqs last disabled at (70217): [] irq_exit+0xa4/0xf8 [ 41.283309] [ 41.283309] other info that might help us debug this: [ 41.289856] Possible unsafe locking scenario: [ 41.289856] [ 41.295793] CPU0 [ 41.298250] ---- [ 41.300706] lock(&(&sk->sk_dst_lock)->rlock); [ 41.305277] [ 41.307908] lock(&(&sk->sk_dst_lock)->rlock); [ 41.312652] [ 41.312652] *** DEADLOCK *** [ 41.312652] [ 41.318605] 2 locks held by connmand/337: [ 41.322628] #0: (rcu_read_lock){.+.+..}, at: [] __netif_receive_skb_core+0x34/0x5e0 [ 41.331445] #1: (rcu_read_lock){.+.+..}, at: [] ip_local_deliver+0x5c/0x30c [ 41.339559] [ 41.339559] stack backtrace: [ 41.343959] CPU: 0 PID: 337 Comm: connmand Not tainted 3.13.0-rc4-00018-g3b78c2f-dirty #8 [ 41.352208] [] (unwind_backtrace+0x0/0xf0) from [] (show_stack+0x10/0x14) [ 41.360797] [] (show_stack+0x10/0x14) from [] (print_usage_bug.part.27+0x218/0x280) [ 41.370251] [] (print_usage_bug.part.27+0x218/0x280) from [] (mark_lock+0x288/0x668) [ 41.379784] [] (mark_lock+0x288/0x668) from [] (__lock_acquire+0x598/0x1a64) [ 41.388620] [] (__lock_acquire+0x598/0x1a64) from [] (lock_acquire+0x9c/0x104) [ 41.397639] [] (lock_acquire+0x9c/0x104) from [] (_raw_spin_lock+0x28/0x38) [ 41.406390] [] (_raw_spin_lock+0x28/0x38) from [] (__udp4_lib_rcv+0x7e0/0x8a8) [ 41.415399] [] (__udp4_lib_rcv+0x7e0/0x8a8) from [] (ip_local_deliver+0xc8/0x30c) [ 41.424667] [] (ip_local_deliver+0xc8/0x30c) from [] (ip_rcv+0x35c/0x74c) [ 41.433247] [] (ip_rcv+0x35c/0x74c) from [] (__netif_receive_skb_core+0x2d8/0x5e0) [ 41.442611] [] (__netif_receive_skb_core+0x2d8/0x5e0) from [] (napi_gro_receive+0x74/0xa0) [ 41.452675] [] (napi_gro_receive+0x74/0xa0) from [] (fec_enet_rx_napi+0x304/0x704) [ 41.462037] [] (fec_enet_rx_napi+0x304/0x704) from [] (net_rx_action+0xc0/0x20c) [ 41.471235] [] (net_rx_action+0xc0/0x20c) from [] (__do_softirq+0xec/0x2c4) [ 41.479987] [] (__do_softirq+0xec/0x2c4) from [] (irq_exit+0xa4/0xf8) [ 41.488208] [] (irq_exit+0xa4/0xf8) from [] (handle_IRQ+0x34/0x84) [ 41.496172] [] (handle_IRQ+0x34/0x84) from [] (__irq_usr+0x44/0x60)