From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: Hung tasks related to do_filp_open in net-next (3.8.0-rc3+) Date: Thu, 24 Jan 2013 10:42:11 -0800 Message-ID: <51018083.1000304@candelatech.com> References: <51005858.4040107@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: "linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , netdev Return-path: In-Reply-To: <51005858.4040107-my8/4N5VtI7c+919tysfdA@public.gmane.org> Sender: linux-nfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org On 01/23/2013 01:38 PM, Ben Greear wrote: > > I cranked up my 3000 NFS mounts test case on today's net-next (3.8.0-rc3+) > and about 8 of these splats. There were around 780 mounts active > when these occurred. > > Seems like the system continues OK, so not sure how important > this is... I'm seeing this occasionally on 3.7.3 (plus Eric's patch to fix the crashes I was seeing), so it's not a regression. Maybe it's just expected on a very overloaded system.... Thanks, Ben > > INFO: task btserver:8756 blocked for more than 180 seconds. > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > btserver D 0000000000000004 0 8756 5781 0x00000080 > ffff880404ab1bf8 0000000000000046 0000000004ab1ba8 0000000000000432 > ffff880404ab0010 ffff880402263f20 ffff880404ab1fd8 00000000000132c0 > 00000000000132c0 00000000000132c0 ffff880404ab1fd8 00000000000132c0 > Call Trace: > [] schedule+0x5f/0x61 > [] schedule_preempt_disabled+0x13/0x1f > [] __mutex_lock_common+0x264/0x42d > [] ? do_last+0x1db/0xa4e > [] ? do_last+0x1db/0xa4e > [] mutex_lock_nested+0x16/0x18 > [] do_last+0x1db/0xa4e > [] ? path_init+0xcd/0x2b6 > [] path_openat+0xcb/0x363 > [] ? __lock_acquire+0x1df/0x53d > [] do_filp_open+0x38/0x84 > [] ? _raw_spin_unlock+0x45/0x52 > [] ? __alloc_fd+0x106/0x11a > [] ? __schedule+0x561/0x5a3 > 8021q: adding VLAN 0 to HW filter on device eth4#621 > [] do_sys_open+0x6d/0xff > 8021q: adding VLAN 0 to HW filter on device eth3#612 > [] sys_open+0x1c/0x1e > [] system_call_fastpath+0x16/0x1b > 2 locks held by btserver/8756: > #0: (sb_writers#10){......}, at: [] mnt_want_write+0x1f/0x48 > #1: (&type->i_mutex_dir_key#4){......}, at: [] do_last+0x1db/0xa4e > > > -- Ben Greear Candela Technologies Inc http://www.candelatech.com -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html