From: Jay Vosburgh <jay.vosburgh@canonical.com>
To: paulmck@linux.vnet.ibm.com
Cc: Yanko Kaneti <yaneti@declera.com>,
Josh Boyer <jwboyer@fedoraproject.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Cong Wang <cwang@twopensource.com>, Kevin Fenzi <kevin@scrye.com>,
netdev <netdev@vger.kernel.org>,
"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
mroos@linux.ee, tj@kernel.org
Subject: Re: localed stuck in recent 3.18 git in copy_net_ns?
Date: Fri, 24 Oct 2014 15:34:07 -0700 [thread overview]
Message-ID: <8915.1414190047@famine> (raw)
In-Reply-To: <20141024214927.GA4977@linux.vnet.ibm.com>
Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:
>On Sat, Oct 25, 2014 at 12:25:57AM +0300, Yanko Kaneti wrote:
>> On Fri-10/24/14-2014 11:32, Paul E. McKenney wrote:
>> > On Fri, Oct 24, 2014 at 08:35:26PM +0300, Yanko Kaneti wrote:
>> > > On Fri-10/24/14-2014 10:20, Paul E. McKenney wrote:
>
>[ . . . ]
>
>> > > > Well, if you are feeling aggressive, give the following patch a spin.
>> > > > I am doing sanity tests on it in the meantime.
>> > >
>> > > Doesn't seem to make a difference here
>> >
>> > OK, inspection isn't cutting it, so time for tracing. Does the system
>> > respond to user input? If so, please enable rcu:rcu_barrier ftrace before
>> > the problem occurs, then dump the trace buffer after the problem occurs.
>>
>> Sorry for being unresposive here, but I know next to nothing about tracing
>> or most things about the kernel, so I have some cathing up to do.
>>
>> In the meantime some layman observations while I tried to find what exactly
>> triggers the problem.
>> - Even in runlevel 1 I can reliably trigger the problem by starting libvirtd
>> - libvirtd seems to be very active in using all sorts of kernel facilities
>> that are modules on fedora so it seems to cause many simultaneous kworker
>> calls to modprobe
>> - there are 8 kworker/u16 from 0 to 7
>> - one of these kworkers always deadlocks, while there appear to be two
>> kworker/u16:6 - the seventh
>
>Adding Tejun on CC in case this duplication of kworker/u16:6 is important.
>
>> 6 vs 8 as in 6 rcuos where before they were always 8
>>
>> Just observations from someone who still doesn't know what the u16
>> kworkers are..
>
>Could you please run the following diagnostic patch? This will help
>me see if I have managed to miswire the rcuo kthreads. It should
>print some information at task-hang time.
Here's the output of the patch; I let it sit through two hang
cycles.
-J
[ 240.348020] INFO: task ovs-vswitchd:902 blocked for more than 120 seconds.
[ 240.354878] Not tainted 3.17.0-testola+ #4
[ 240.359481] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 240.367285] ovs-vswitchd D ffff88013fc94600 0 902 901 0x00000004
[ 240.367290] ffff8800ab20f7b8 0000000000000002 ffff8800b3304b00 ffff8800ab20ffd8
[ 240.367293] 0000000000014600 0000000000014600 ffff8800b0810000 ffff8800b3304b00
[ 240.367296] ffff8800b3304b00 ffffffff81c59850 ffffffff81c59858 7fffffffffffffff
[ 240.367300] Call Trace:
[ 240.367307] [<ffffffff81722b99>] schedule+0x29/0x70
[ 240.367310] [<ffffffff81725b6c>] schedule_timeout+0x1dc/0x260
[ 240.367313] [<ffffffff81722f69>] ? _cond_resched+0x29/0x40
[ 240.367316] [<ffffffff81723818>] ? wait_for_completion+0x28/0x160
[ 240.367321] [<ffffffff811081a7>] ? queue_stop_cpus_work+0xc7/0xe0
[ 240.367324] [<ffffffff81723896>] wait_for_completion+0xa6/0x160
[ 240.367328] [<ffffffff81099980>] ? wake_up_state+0x20/0x20
[ 240.367331] [<ffffffff810d0ecc>] _rcu_barrier+0x20c/0x480
[ 240.367334] [<ffffffff810d1195>] rcu_barrier+0x15/0x20
[ 240.367338] [<ffffffff81625010>] netdev_run_todo+0x60/0x300
[ 240.367341] [<ffffffff8162f9ee>] rtnl_unlock+0xe/0x10
[ 240.367349] [<ffffffffa01ffcc5>] internal_dev_destroy+0x55/0x80 [openvswitch]
[ 240.367354] [<ffffffffa01ff622>] ovs_vport_del+0x32/0x40 [openvswitch]
[ 240.367358] [<ffffffffa01f8dd0>] ovs_dp_detach_port+0x30/0x40 [openvswitch]
[ 240.367363] [<ffffffffa01f8ea5>] ovs_vport_cmd_del+0xc5/0x110 [openvswitch]
[ 240.367367] [<ffffffff81651d75>] genl_family_rcv_msg+0x1a5/0x3c0
[ 240.367370] [<ffffffff81651f90>] ? genl_family_rcv_msg+0x3c0/0x3c0
[ 240.367372] [<ffffffff81652021>] genl_rcv_msg+0x91/0xd0
[ 240.367376] [<ffffffff81650091>] netlink_rcv_skb+0xc1/0xe0
[ 240.367378] [<ffffffff816505bc>] genl_rcv+0x2c/0x40
[ 240.367381] [<ffffffff8164f626>] netlink_unicast+0xf6/0x200
[ 240.367383] [<ffffffff8164fa4d>] netlink_sendmsg+0x31d/0x780
[ 240.367387] [<ffffffff8164ca74>] ? netlink_rcv_wake+0x44/0x60
[ 240.367391] [<ffffffff81606a53>] sock_sendmsg+0x93/0xd0
[ 240.367395] [<ffffffff81337700>] ? apparmor_capable+0x60/0x60
[ 240.367399] [<ffffffff81614f27>] ? verify_iovec+0x47/0xd0
[ 240.367402] [<ffffffff81606e79>] ___sys_sendmsg+0x399/0x3b0
[ 240.367406] [<ffffffff812598a2>] ? kernfs_seq_stop_active+0x32/0x40
[ 240.367410] [<ffffffff8101c385>] ? native_sched_clock+0x35/0x90
[ 240.367413] [<ffffffff8101c385>] ? native_sched_clock+0x35/0x90
[ 240.367416] [<ffffffff8101c3e9>] ? sched_clock+0x9/0x10
[ 240.367420] [<ffffffff811277fc>] ? acct_account_cputime+0x1c/0x20
[ 240.367424] [<ffffffff8109ce6b>] ? account_user_time+0x8b/0xa0
[ 240.367428] [<ffffffff81200bd5>] ? __fget_light+0x25/0x70
[ 240.367431] [<ffffffff81607c02>] __sys_sendmsg+0x42/0x80
[ 240.367433] [<ffffffff81607c52>] SyS_sendmsg+0x12/0x20
[ 240.367436] [<ffffffff81727464>] tracesys_phase2+0xd8/0xdd
[ 240.367439] rcu_show_nocb_setup(): rcu_sched nocb state:
[ 240.372734] 0: ffff88013fc0e600 l:ffff88013fc0e600 n:ffff88013fc8e600 .G.
[ 240.379673] 1: ffff88013fc8e600 l:ffff88013fc0e600 n: (null) .G.
[ 240.386611] 2: ffff88013fd0e600 l:ffff88013fd0e600 n:ffff88013fd8e600 N..
[ 240.393550] 3: ffff88013fd8e600 l:ffff88013fd0e600 n: (null) N..
[ 240.400489] rcu_show_nocb_setup(): rcu_bh nocb state:
[ 240.405525] 0: ffff88013fc0e3c0 l:ffff88013fc0e3c0 n:ffff88013fc8e3c0 ...
[ 240.412463] 1: ffff88013fc8e3c0 l:ffff88013fc0e3c0 n: (null) ...
[ 240.419401] 2: ffff88013fd0e3c0 l:ffff88013fd0e3c0 n:ffff88013fd8e3c0 ...
[ 240.426339] 3: ffff88013fd8e3c0 l:ffff88013fd0e3c0 n: (null) ...
[ 360.432020] INFO: task ovs-vswitchd:902 blocked for more than 120 seconds.
[ 360.438881] Not tainted 3.17.0-testola+ #4
[ 360.443484] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 360.451289] ovs-vswitchd D ffff88013fc94600 0 902 901 0x00000004
[ 360.451293] ffff8800ab20f7b8 0000000000000002 ffff8800b3304b00 ffff8800ab20ffd8
[ 360.451297] 0000000000014600 0000000000014600 ffff8800b0810000 ffff8800b3304b00
[ 360.451300] ffff8800b3304b00 ffffffff81c59850 ffffffff81c59858 7fffffffffffffff
[ 360.451303] Call Trace:
[ 360.451311] [<ffffffff81722b99>] schedule+0x29/0x70
[ 360.451314] [<ffffffff81725b6c>] schedule_timeout+0x1dc/0x260
[ 360.451317] [<ffffffff81722f69>] ? _cond_resched+0x29/0x40
[ 360.451320] [<ffffffff81723818>] ? wait_for_completion+0x28/0x160
[ 360.451325] [<ffffffff811081a7>] ? queue_stop_cpus_work+0xc7/0xe0
[ 360.451327] [<ffffffff81723896>] wait_for_completion+0xa6/0x160
[ 360.451331] [<ffffffff81099980>] ? wake_up_state+0x20/0x20
[ 360.451335] [<ffffffff810d0ecc>] _rcu_barrier+0x20c/0x480
[ 360.451338] [<ffffffff810d1195>] rcu_barrier+0x15/0x20
[ 360.451342] [<ffffffff81625010>] netdev_run_todo+0x60/0x300
[ 360.451345] [<ffffffff8162f9ee>] rtnl_unlock+0xe/0x10
[ 360.451353] [<ffffffffa01ffcc5>] internal_dev_destroy+0x55/0x80 [openvswitch]
[ 360.451358] [<ffffffffa01ff622>] ovs_vport_del+0x32/0x40 [openvswitch]
[ 360.451362] [<ffffffffa01f8dd0>] ovs_dp_detach_port+0x30/0x40 [openvswitch]
[ 360.451366] [<ffffffffa01f8ea5>] ovs_vport_cmd_del+0xc5/0x110 [openvswitch]
[ 360.451370] [<ffffffff81651d75>] genl_family_rcv_msg+0x1a5/0x3c0
[ 360.451373] [<ffffffff81651f90>] ? genl_family_rcv_msg+0x3c0/0x3c0
[ 360.451376] [<ffffffff81652021>] genl_rcv_msg+0x91/0xd0
[ 360.451379] [<ffffffff81650091>] netlink_rcv_skb+0xc1/0xe0
[ 360.451381] [<ffffffff816505bc>] genl_rcv+0x2c/0x40
[ 360.451384] [<ffffffff8164f626>] netlink_unicast+0xf6/0x200
[ 360.451387] [<ffffffff8164fa4d>] netlink_sendmsg+0x31d/0x780
[ 360.451390] [<ffffffff8164ca74>] ? netlink_rcv_wake+0x44/0x60
[ 360.451394] [<ffffffff81606a53>] sock_sendmsg+0x93/0xd0
[ 360.451399] [<ffffffff81337700>] ? apparmor_capable+0x60/0x60
[ 360.451402] [<ffffffff81614f27>] ? verify_iovec+0x47/0xd0
[ 360.451406] [<ffffffff81606e79>] ___sys_sendmsg+0x399/0x3b0
[ 360.451410] [<ffffffff812598a2>] ? kernfs_seq_stop_active+0x32/0x40
[ 360.451414] [<ffffffff8101c385>] ? native_sched_clock+0x35/0x90
[ 360.451417] [<ffffffff8101c385>] ? native_sched_clock+0x35/0x90
[ 360.451419] [<ffffffff8101c3e9>] ? sched_clock+0x9/0x10
[ 360.451424] [<ffffffff811277fc>] ? acct_account_cputime+0x1c/0x20
[ 360.451427] [<ffffffff8109ce6b>] ? account_user_time+0x8b/0xa0
[ 360.451431] [<ffffffff81200bd5>] ? __fget_light+0x25/0x70
[ 360.451434] [<ffffffff81607c02>] __sys_sendmsg+0x42/0x80
[ 360.451437] [<ffffffff81607c52>] SyS_sendmsg+0x12/0x20
[ 360.451440] [<ffffffff81727464>] tracesys_phase2+0xd8/0xdd
[ 360.451442] rcu_show_nocb_setup(): rcu_sched nocb state:
[ 360.456737] 0: ffff88013fc0e600 l:ffff88013fc0e600 n:ffff88013fc8e600 ...
[ 360.463676] 1: ffff88013fc8e600 l:ffff88013fc0e600 n: (null) ...
[ 360.470614] 2: ffff88013fd0e600 l:ffff88013fd0e600 n:ffff88013fd8e600 N..
[ 360.477554] 3: ffff88013fd8e600 l:ffff88013fd0e600 n: (null) N..
[ 360.484494] rcu_show_nocb_setup(): rcu_bh nocb state:
[ 360.489529] 0: ffff88013fc0e3c0 l:ffff88013fc0e3c0 n:ffff88013fc8e3c0 ...
[ 360.496469] 1: ffff88013fc8e3c0 l:ffff88013fc0e3c0 n: (null) .G.
[ 360.503407] 2: ffff88013fd0e3c0 l:ffff88013fd0e3c0 n:ffff88013fd8e3c0 ...
[ 360.510346] 3: ffff88013fd8e3c0 l:ffff88013fd0e3c0 n: (null) ...
---
-Jay Vosburgh, jay.vosburgh@canonical.com
next prev parent reply other threads:[~2014-10-24 22:34 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 20:15 localed stuck in recent 3.18 git in copy_net_ns? Kevin Fenzi
2014-10-20 20:43 ` Dave Jones
2014-10-20 20:53 ` Kevin Fenzi
2014-10-21 21:12 ` Kevin Fenzi
2014-10-22 17:12 ` Josh Boyer
2014-10-22 17:37 ` Cong Wang
2014-10-22 17:49 ` Josh Boyer
2014-10-22 17:53 ` Eric W. Biederman
2014-10-22 18:11 ` Paul E. McKenney
2014-10-22 18:25 ` Eric W. Biederman
2014-10-22 18:55 ` Paul E. McKenney
2014-10-22 19:33 ` Josh Boyer
2014-10-22 22:40 ` Yanko Kaneti
2014-10-22 23:24 ` Paul E. McKenney
2014-10-23 6:09 ` Yanko Kaneti
2014-10-23 12:27 ` Paul E. McKenney
2014-10-23 15:33 ` Paul E. McKenney
[not found] ` <CA+5PVA4H6EAf6cBc4a_8W8x4Mgppjc5GsskKaCRry2jq+LP+FA@mail.gmail.com>
2014-10-23 16:28 ` Paul E. McKenney
2014-10-23 19:51 ` Yanko Kaneti
2014-10-23 20:05 ` Paul E. McKenney
2014-10-23 21:45 ` Yanko Kaneti
2014-10-23 22:04 ` Paul E. McKenney
2014-10-24 4:48 ` Jay Vosburgh
2014-10-24 14:50 ` Paul E. McKenney
2014-10-24 18:20 ` Jay Vosburgh
2014-10-24 18:33 ` Paul E. McKenney
2014-10-24 9:08 ` Yanko Kaneti
2014-10-24 15:40 ` Paul E. McKenney
2014-10-24 16:29 ` Yanko Kaneti
2014-10-24 16:54 ` Paul E. McKenney
2014-10-24 17:09 ` Yanko Kaneti
2014-10-24 17:20 ` Paul E. McKenney
2014-10-24 17:35 ` Yanko Kaneti
2014-10-24 18:32 ` Paul E. McKenney
2014-10-24 18:49 ` Jay Vosburgh
2014-10-24 18:57 ` Paul E. McKenney
2014-10-24 20:15 ` Paul E. McKenney
2014-10-24 21:25 ` Yanko Kaneti
2014-10-24 21:49 ` Paul E. McKenney
2014-10-24 22:02 ` Jay Vosburgh
2014-10-24 22:16 ` Paul E. McKenney
2014-10-24 22:41 ` Jay Vosburgh
2014-10-24 22:34 ` Jay Vosburgh [this message]
2014-10-24 22:59 ` Paul E. McKenney
2014-10-24 23:05 ` Paul E. McKenney
2014-10-25 0:20 ` Jay Vosburgh
2014-10-25 2:03 ` Paul E. McKenney
2014-10-25 4:33 ` Jay Vosburgh
2014-10-25 5:16 ` Paul E. McKenney
2014-10-25 16:38 ` Jay Vosburgh
2014-10-25 18:18 ` Paul E. McKenney
2014-10-27 17:45 ` Paul E. McKenney
2014-10-27 20:43 ` Jay Vosburgh
2014-10-27 21:07 ` Paul E. McKenney
2014-10-28 8:12 ` Yanko Kaneti
2014-10-28 12:50 ` Paul E. McKenney
2014-10-28 13:00 ` Yanko Kaneti
2014-10-28 15:54 ` Kevin Fenzi
2014-10-28 16:15 ` Paul E. McKenney
2014-10-25 12:09 ` Yanko Kaneti
2014-10-25 13:38 ` Paul E. McKenney
2014-10-22 17:59 ` Paul E. McKenney
2014-10-22 18:03 ` Josh Boyer
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