On Fri, 24 Oct 2014, Paul E. McKenney wrote:
> On Fri, Oct 24, 2014 at 02:40:28PM -0400, Eric B Munson wrote:
> > 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.
>
> Yep, looks like something that some other people are running into as well.
>
> If you turn off CONFIG_RCU_NOCB_CPU, do you still get the failure?
>
> Thanx, Paul
>
Disabling CONFIG_RCU_NOCB_CPU fixes the problem. I am able to hibernate
and resume successfully.
Eric
> > 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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