From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750704AbWBBKzv (ORCPT ); Thu, 2 Feb 2006 05:55:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750712AbWBBKzv (ORCPT ); Thu, 2 Feb 2006 05:55:51 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:44957 "EHLO mx3.mail.elte.hu") by vger.kernel.org with ESMTP id S1750704AbWBBKzv (ORCPT ); Thu, 2 Feb 2006 05:55:51 -0500 Date: Thu, 2 Feb 2006 11:54:29 +0100 From: Ingo Molnar To: Herbert Xu Cc: "David S. Miller" , linux-kernel@vger.kernel.org Subject: Re: [lock validator] inet6_destroy_sock(): soft-safe -> soft-unsafe lock dependency Message-ID: <20060202105429.GA4895@elte.hu> References: <20060128152204.GA13940@elte.hu> <20060131102758.GA31460@gondor.apana.org.au> <20060131.024323.83813817.davem@davemloft.net> <20060201133219.GA1435@elte.hu> <20060201202610.GA13107@gondor.apana.org.au> <20060202074627.GA6805@elte.hu> <20060202084824.GA17299@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060202084824.GA17299@gondor.apana.org.au> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=no SpamAssassin version=3.0.3 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org hm, i got a new one: ============================================ [ BUG: circular locking deadlock detected! ] -------------------------------------------- sshd/28997 is trying to acquire lock: (&sk->sk_lock.slock){-+}, at: [] packet_rcv+0xbf/0x34b but task is already holding lock: (&dev->xmit_lock){-+}, at: [] qdisc_restart+0x46/0x207 which lock already depends on the new lock, which could lead to circular deadlocks! the dependency chain (in reverse order) is: -> #2 (&dev->xmit_lock){-+}: [] qdisc_restart+0x46/0x207 -> #1 (&dev->queue_lock){-+}: [] dev_queue_xmit+0xc3/0x21e -> #0 (&sk->sk_lock.slock){-+}: [] packet_rcv+0xbf/0x34b other info that might help us debug this: 1 locks held by sshd/28997: #0: (&dev->xmit_lock){-+}, at: [] qdisc_restart+0x46/0x207 stack backtrace: [] show_trace+0xd/0xf [] dump_stack+0x15/0x17 [] print_circular_bug_tail+0x42/0x4b [] debug_lock_chain+0xb30/0xd58 [] debug_lock_chain_spin+0x31/0x48 [] _raw_spin_lock+0x34/0x7f [] _spin_lock+0x8/0xa [] packet_rcv+0xbf/0x34b [] dev_queue_xmit_nit+0xbb/0xdd [] qdisc_restart+0xff/0x207 [] dev_queue_xmit+0xda/0x21e [] ip_output+0x237/0x2c1 [] ip_queue_xmit+0x394/0x417 [] tcp_transmit_skb+0x5d4/0x5f6 [] __tcp_push_pending_frames+0x256/0x305 [] tcp_sendmsg+0x8ae/0x975 [] inet_sendmsg+0x39/0x46 [] do_sock_write+0xbd/0xc6 [] sock_aio_write+0x56/0x64 [] do_sync_write+0xb1/0xe6 [] vfs_write+0xbd/0x155 [] sys_write+0x3b/0x60 [] syscall_call+0x7/0xb