From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.candelatech.com ([208.74.158.172]:35953 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754086Ab0KJXCe (ORCPT ); Wed, 10 Nov 2010 18:02:34 -0500 Received: from [192.168.100.195] (firewall.candelatech.com [70.89.124.249]) (authenticated bits=0) by ns3.lanforge.com (8.14.2/8.14.2) with ESMTP id oAAN2Wak027099 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 10 Nov 2010 15:02:33 -0800 Message-ID: <4CDB2488.4040802@candelatech.com> Date: Wed, 10 Nov 2010 15:02:32 -0800 From: Ben Greear MIME-Version: 1.0 To: "linux-wireless@vger.kernel.org" Subject: ath5k/mac80211: Reproducible deadlock with 64-stations. Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: We started up our strenuous wifi testing again, with this morning's wireless-testing (plus some of our own non-wifi-related patches). We have a reproducible kernel hang when attempting to quickly create and configure 64 STA interfaces, no encryption, with an ath5k NIC. It appears to me that this may be a general mac80211 deadlock from the 'sysrq d' output below. We'll attempt to reproduce with a lesser-patched wireless-testing in the meantime. Nov 10 14:54:33 localhost kernel: SysRq : Show Locks Held Nov 10 14:54:33 localhost kernel: Nov 10 14:54:33 localhost kernel: Showing all locks held in the system: Nov 10 14:54:33 localhost kernel: 3 locks held by kworker/0:0/4: Nov 10 14:54:33 localhost kernel: #0: (events){+.+.+.}, at: [] process_one_work+0x13e/0x2bf Nov 10 14:54:33 localhost kernel: #1: ((linkwatch_work).work){+.+.+.}, at: [] process_one_work+0x13e/0x2bf Nov 10 14:54:33 localhost kernel: #2: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by ntpd/1675: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by bash/2182: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by bash/2199: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2517: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2518: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2519: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2520: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2521: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by mingetty/2522: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 1 lock held by bash/2679: Nov 10 14:54:33 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [] n_tty_read+0x1d2/0x5ee Nov 10 14:54:33 localhost kernel: 3 locks held by kworker/0:3/5698: Nov 10 14:54:33 localhost kernel: #0: (events){+.+.+.}, at: [] process_one_work+0x13e/0x2bf Nov 10 14:54:33 localhost kernel: #1: (wireless_nlevent_work){+.+.+.}, at: [] process_one_work+0x13e/0x2bf Nov 10 14:54:33 localhost kernel: #2: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by ip/6438: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] netlink_dump+0x3a/0x16a Nov 10 14:54:33 localhost kernel: 1 lock held by ip/6441: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by ip/6442: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by iwconfig/6443: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 1 lock held by ip/6444: Nov 10 14:54:33 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [] rtnl_lock+0xf/0x11 Nov 10 14:54:33 localhost kernel: 4 locks held by sh/6449: Nov 10 14:54:33 localhost kernel: #0: (&(&i->lock)->rlock){-.-...}, at: [] serial8250_interrupt+0x1e/0xe2 Nov 10 14:54:33 localhost kernel: #1: (&port_lock_key){-.-...}, at: [] serial8250_handle_port+0x10/0x26c Nov 10 14:54:33 localhost kernel: #2: (sysrq_key_table_lock){-.....}, at: [] __handle_sysrq+0x18/0x11d Nov 10 14:54:33 localhost kernel: #3: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x43/0x179 -- Ben Greear Candela Technologies Inc http://www.candelatech.com