Return-path: Received: from fg-out-1718.google.com ([72.14.220.152]:28136 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753220AbYHDKBR (ORCPT ); Mon, 4 Aug 2008 06:01:17 -0400 Received: by fg-out-1718.google.com with SMTP id 19so951196fgg.17 for ; Mon, 04 Aug 2008 03:01:14 -0700 (PDT) Message-ID: <4896D34A.1000005@gmail.com> (sfid-20080804_120123_804523_637C5AF0) Date: Mon, 04 Aug 2008 12:00:42 +0200 From: Jiri Slaby MIME-Version: 1.0 To: Dave Young CC: Pekka J Enberg , Andrew Morton , Johannes Berg , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, Bob Copeland Subject: Re: [BUG] wireless : cpu stuck for 61s References: <20080729055731.GA3265@darkstar> <1217334724.10489.47.camel@johannes.berg> <20080730020820.8bcc00e2.akpm@linux-foundation.org> <20080730031047.54e13e2d.akpm@linux-foundation.org> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: Dave Young napsal(a): > Lockdep helped me, this morning I get a lockdep warning about this, > > [ 171.432140] [ INFO: possible recursive locking detected ] > [ 171.433113] 2.6.27-rc1-smp #4 > [ 171.434079] --------------------------------------------- > [ 171.435039] ath5k_pci/2447 is trying to acquire lock: > [ 171.435990] (&sc->lock){--..}, at: [] > ath5k_config_interface+0xd5/0x340 [ath5k] > [ 171.437046] > [ 171.437048] but task is already holding lock: > [ 171.438903] (&sc->lock){--..}, at: [] > ath5k_config_interface+0x3d/0x340 [ath5k] > [ 171.439953] > [ 171.439954] other info that might help us debug this: > [ 171.441795] 3 locks held by ath5k_pci/2447: > [ 171.442729] #0: ((name)){--..}, at: [] run_workqueue+0x102/0x1d0 > [ 171.443800] #1: (&(&local->scan_work)->work){--..}, at: > [] run_workqueue+0x102/0x1d0 > [ 171.444859] #2: (&sc->lock){--..}, at: [] > ath5k_config_interface+0x3d/0x340 [ath5k] > > Deadlock happen here, I remove the lock in the sub routine, tested and > fixed the problem for me. > I will send the patch after a while. That's some kind different. 2.6.26 can't suffer from the thing above (opposing to 27-rc1). Pasting the original issue below. Maybe it's been fixed too? I suppose you don't encounter the problem anymore in 27-rc1 with your/Bob's/mine (fix for the same thing in the same manner) patch applied? BUG: soft lockup - CPU#0 stuck for 61s! [events/0:9] Modules linked in: radeonfb fb_ddc i2c_algo_bit snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss rfcomm l2cap bluetooth vfat fuse rtc_cmos rtc_core psmouse intel_agp pl2303 rtc_lib ath5k e100 i2c_i801 serio_raw usbserial agpgart 3c59x mii snd_hda_intel snd_pcm mac80211 snd_timer snd_page_alloc cfg80211 snd_hwdep snd soundcore thermal processor button thermal_sys evdev sg Pid: 9, comm: events/0 Tainted: G W (2.6.26-smp #3) EIP: 0060:[] EFLAGS: 00000246 CPU: 0 EIP is at mutex_lock_nested+0x1b3/0x280 EAX: 00000000 EBX: f7bf5284 ECX: f7c7e000 EDX: f7bf52a8 ESI: f7bf5288 EDI: 00000246 EBP: f7c7fedc ESP: f7c7fe9c DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 CR0: 8005003b CR2: b800c5ac CR3: 36e71000 CR4: 000006d0 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 DR6: ffff0ff0 DR7: 00000400 [] ? debugfs_create_file+0x46/0x210 [] ? debugfs_create_file+0x46/0x210 [] debugfs_create_file+0x46/0x210 [] debugfs_create_dir+0x21/0x30 [] ieee80211_sta_debugfs_add+0x2d/0x150 [mac80211] [] sta_info_debugfs_add_work+0x89/0x130 [mac80211] [] ? rate_control_pid_add_sta_debugfs+0x0/0x30 [mac80211] [] run_workqueue+0x156/0x1d0 [] ? run_workqueue+0x102/0x1d0 [] ? sta_info_debugfs_add_work+0x0/0x130 [mac80211] [] worker_thread+0x88/0xe0 [] ? autoremove_wake_function+0x0/0x40 [] ? worker_thread+0x0/0xe0 [] kthread+0x42/0x70 [] ? kthread+0x0/0x70 [] kernel_thread_helper+0x7/0x14 ======================= BUG: soft lockup - CPU#0 stuck for 61s! [events/0:9] Modules linked in: radeonfb fb_ddc i2c_algo_bit snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss rfcomm l2cap bluetooth vfat fuse rtc_cmos rtc_core psmouse intel_agp pl2303 rtc_lib ath5k e100 i2c_i801 serio_raw usbserial agpgart 3c59x mii snd_hda_intel snd_pcm mac80211 snd_timer snd_page_alloc cfg80211 snd_hwdep snd soundcore thermal processor button thermal_sys evdev sg Pid: 9, comm: events/0 Tainted: G W (2.6.26-smp #3) EIP: 0060:[] EFLAGS: 00000246 CPU: 0 EIP is at mutex_lock_nested+0x1b3/0x280 EAX: 00000000 EBX: f7bf5284 ECX: f7c7e000 EDX: f7bf52a8 ESI: f7bf5288 EDI: 00000246 EBP: f7c7fedc ESP: f7c7fe9c DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 CR0: 8005003b CR2: b800c5ac CR3: 36e71000 CR4: 000006d0 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 DR6: ffff0ff0 DR7: 00000400 [] ? debugfs_create_file+0x46/0x210 [] ? debugfs_create_file+0x46/0x210 [] debugfs_create_file+0x46/0x210 [] debugfs_create_dir+0x21/0x30 [] ieee80211_sta_debugfs_add+0x2d/0x150 [mac80211] [] sta_info_debugfs_add_work+0x89/0x130 [mac80211] [] ? rate_control_pid_add_sta_debugfs+0x0/0x30 [mac80211] [] run_workqueue+0x156/0x1d0 [] ? run_workqueue+0x102/0x1d0 [] ? sta_info_debugfs_add_work+0x0/0x130 [mac80211] [] worker_thread+0x88/0xe0 [] ? autoremove_wake_function+0x0/0x40 [] ? worker_thread+0x0/0xe0 [] kthread+0x42/0x70 [] ? kthread+0x0/0x70 [] kernel_thread_helper+0x7/0x14 =======================