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Date: Fri, 24 Oct 2014 14:40:28 -0400
From: Eric B Munson <emunson@...mai.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Commit 35ce7f29a breaks hibernation for XPS 13
On Fri, 24 Oct 2014, Paul E. McKenney wrote:
> On Fri, Oct 24, 2014 at 12:36:12PM -0400, Eric B Munson wrote:
> > On Fri, 24 Oct 2014, Paul E. McKenney wrote:
> >
> > > On Fri, Oct 24, 2014 at 12:08:15PM -0400, Eric B Munson wrote:
> > > > Paul,
> > > >
> > > > As of 3.18-rc1 I can no longer hibernate my Dell XPS-13. Bisect points
> > > > the finger at 35ce7f29a. A revert of that commit confirms, I can once
> > > > again hibernate my machine without it.
> > > >
> > > > When the hibernation fails I see this in dmesg:
> > > > [ 37.953313] PM: Syncing filesystems ... done.
> > > > [ 37.963694] Freezing user space processes ... (elapsed 0.001 seconds) done.
> > > > [ 37.965297] PM: Marking nosave pages: [mem 0x00000000-0x00000fff]
> > > > [ 37.965299] PM: Marking nosave pages: [mem 0x00058000-0x00058fff]
> > > > [ 37.965301] PM: Marking nosave pages: [mem 0x0009d000-0x000fffff]
> > > > [ 37.965304] PM: Marking nosave pages: [mem 0xc496a000-0xc4b6bfff]
> > > > [ 37.965315] PM: Marking nosave pages: [mem 0xdadb7000-0xdcffefff]
> > > > [ 37.965479] PM: Marking nosave pages: [mem 0xdd000000-0xffffffff]
> > > > [ 37.966000] PM: Basic memory bitmaps created
> > > > [ 37.966046] PM: Preallocating image memory... done (allocated 181989 pages)
> > > > [ 38.141524] PM: Allocated 727956 kbytes in 0.17 seconds (4282.09 MB/s)
> > > > [ 38.141525] Freezing remaining freezable tasks ...
> > > > [ 58.151863] Freezing of tasks failed after 20.004 seconds (0 tasks refusing to freeze, wq_busy=1):
> > > > [ 58.151894]
> > > > [ 58.151896] Restarting kernel threads ... done.
> > > > [ 58.181915] PM: Basic memory bitmaps freed
> > > > [ 58.181917] Restarting tasks ... done.
> > > >
> > > >
> > > > I am not sure what else I can provide that might be useful, but I did
> > > > see the thread on net-dev about this same commit. Please CC me on any
> > > > fixes and I will be happy to test.
> > >
> > > Thank you for the bug report!
> > >
> > > Does the following patch help?
> > >
> > > Thanx, Paul
> >
> > Paul,
> >
> > This patch does not help. I see the same dmesg output and failure to
> > hibernate.
>
> Thank you for testing it. Does the following (untested, might not even
> build) patch help? (Or feel free to wait until I have done some testing
> on it.)
>
> Thanx, Paul
Still didn't help. If it helps, when I attempt to reboot after trying
to hibernate I see a kworker thread hung and get the stack trace below
from that thread. I assume this is the same thread that is holding up
the hibernate.
Oct 24 14:26:46 lappy-486 kernel: [ 240.479810] INFO: task kworker/1:0:16 blocked for more than 120 seconds.
Oct 24 14:26:46 lappy-486 kernel: [ 240.479815] Tainted: G E 3.18.0-rc1+ #78
Oct 24 14:26:46 lappy-486 kernel: [ 240.479816] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct 24 14:26:46 lappy-486 kernel: [ 240.479818] kworker/1:0 D ffff88021f254600 0 16 2 0x00000000
Oct 24 14:26:46 lappy-486 kernel: [ 240.479827] Workqueue: usb_hub_wq hub_event
Oct 24 14:26:46 lappy-486 kernel: [ 240.479829] ffff880213a93908 0000000000000046 ffff880213a83200 ffff880213a93fd8
Oct 24 14:26:46 lappy-486 kernel: [ 240.479831] 0000000000014600 0000000000014600 ffff88021357e400 ffff880213a83200
Oct 24 14:26:46 lappy-486 kernel: [ 240.479834] 0000000000014600 ffffffff81c58a10 ffffffff81c58a18 7fffffffffffffff
Oct 24 14:26:46 lappy-486 kernel: [ 240.479836] Call Trace:
Oct 24 14:26:46 lappy-486 kernel: [ 240.479843] [<ffffffff8174d919>] schedule+0x29/0x70
Oct 24 14:26:46 lappy-486 kernel: [ 240.479846] [<ffffffff8175091c>] schedule_timeout+0x20c/0x280
Oct 24 14:26:46 lappy-486 kernel: [ 240.479851] [<ffffffff81097bbd>] ? check_preempt_curr+0x8d/0xa0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479854] [<ffffffff81097bed>] ? ttwu_do_wakeup+0x1d/0xd0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479857] [<ffffffff8174e616>] wait_for_completion+0xa6/0x160
Oct 24 14:26:46 lappy-486 kernel: [ 240.479860] [<ffffffff8109abb0>] ? wake_up_state+0x20/0x20
Oct 24 14:26:46 lappy-486 kernel: [ 240.479863] [<ffffffff810ce267>] _rcu_barrier+0x157/0x200
Oct 24 14:26:46 lappy-486 kernel: [ 240.479865] [<ffffffff810ce365>] rcu_barrier+0x15/0x20
Oct 24 14:26:46 lappy-486 kernel: [ 240.479870] [<ffffffff816632f0>] netdev_run_todo+0x60/0x300
Oct 24 14:26:46 lappy-486 kernel: [ 240.479874] [<ffffffff8166ddee>] rtnl_unlock+0xe/0x10
Oct 24 14:26:46 lappy-486 kernel: [ 240.479877] [<ffffffff8165d3c5>] unregister_netdev+0x25/0x30
Oct 24 14:26:46 lappy-486 kernel: [ 240.479883] [<ffffffffa05b9768>] usbnet_disconnect+0x48/0xf0 [usbnet]
Oct 24 14:26:46 lappy-486 kernel: [ 240.479888] [<ffffffff81577a28>] usb_unbind_interface+0x1f8/0x2c0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479893] [<ffffffff814c90e6>] ? rpm_idle+0xd6/0x2b0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479898] [<ffffffff814bf3cf>] __device_release_driver+0x7f/0xf0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479901] [<ffffffff814bf463>] device_release_driver+0x23/0x30
Oct 24 14:26:46 lappy-486 kernel: [ 240.479904] [<ffffffff814bed58>] bus_remove_device+0x108/0x180
Oct 24 14:26:46 lappy-486 kernel: [ 240.479907] [<ffffffff814bb4d9>] device_del+0x129/0x1e0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479910] [<ffffffff81575140>] usb_disable_device+0xb0/0x290
Oct 24 14:26:46 lappy-486 kernel: [ 240.479913] [<ffffffff8156a554>] usb_disconnect+0x94/0x2c0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479915] [<ffffffff8156cbe4>] hub_event+0x994/0x1500
Oct 24 14:26:46 lappy-486 kernel: [ 240.479919] [<ffffffff810a4c5e>] ? dequeue_task_fair+0x44e/0x660
Oct 24 14:26:46 lappy-486 kernel: [ 240.479924] [<ffffffff81088280>] process_one_work+0x150/0x3f0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479927] [<ffffffff81088971>] worker_thread+0x121/0x520
Oct 24 14:26:46 lappy-486 kernel: [ 240.479930] [<ffffffff81088850>] ? rescuer_thread+0x330/0x330
Oct 24 14:26:46 lappy-486 kernel: [ 240.479932] [<ffffffff8108d942>] kthread+0xd2/0xf0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479935] [<ffffffff8108d870>] ? kthread_create_on_node+0x180/0x180
Oct 24 14:26:46 lappy-486 kernel: [ 240.479939] [<ffffffff81751ffc>] ret_from_fork+0x7c/0xb0
Oct 24 14:26:46 lappy-486 kernel: [ 240.479941] [<ffffffff8108d870>] ? kthread_create_on_node+0x180/0x180
Eric
>
> ------------------------------------------------------------------------
>
> diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> index 29fb23f33c18..927c17b081c7 100644
> --- a/kernel/rcu/tree_plugin.h
> +++ b/kernel/rcu/tree_plugin.h
> @@ -2546,9 +2546,13 @@ static void rcu_spawn_one_nocb_kthread(struct rcu_state *rsp, int cpu)
> rdp->nocb_leader = rdp_spawn;
> if (rdp_last && rdp != rdp_spawn)
> rdp_last->nocb_next_follower = rdp;
> - rdp_last = rdp;
> - rdp = rdp->nocb_next_follower;
> - rdp_last->nocb_next_follower = NULL;
> + if (rdp == rdp_spawn) {
> + rdp = rdp->nocb_next_follower;
> + } else {
> + rdp_last = rdp;
> + rdp = rdp->nocb_next_follower;
> + rdp_last->nocb_next_follower = NULL;
> + }
> } while (rdp);
> rdp_spawn->nocb_next_follower = rdp_old_leader;
> }
>
--
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