psmouse_disconnect lockdep splat

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Hi,

just saw this while booting rc3+tip/master. Thought I should report it
in case it hasn't been caught and fixed yet.

---

...
[    6.257924] snd_hda_codec_realtek hdaudioC0D0:      Internal Mic=0x12
[    6.280232] iTCO_vendor_support: vendor-support=0
[    6.282063] snd_hda_intel 0000:00:1b.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops)
[    6.285810] psmouse serio2: Failed to deactivate mouse on synaptics-pt/serio0
[    6.286331] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
[    6.286392] iTCO_wdt: Found a Panther Point TCO device (Version=2, TCOBASE=0x0460)
[    6.290473] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/sound/card0/input10
[    6.293635] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input11
[    6.298520] input: HDA Intel PCH Dock Mic as /devices/pci0000:00/0000:00:1b.0/sound/card0/input12
[    6.300605] iTCO_wdt: initialized. heartbeat=30 sec (nowayout=0)
[    6.303861] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input13
[    6.307117] input: HDA Intel PCH Dock Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input14
[    6.310045] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input15
[    6.311645] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input16
[    6.312865] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1b.0/sound/card0/input17
[    6.346990] usb 1-1: New USB device found, idVendor=8087, idProduct=0024
[    6.348316] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    6.350870] hub 1-1:1.0: USB hub found
[    6.352530] hub 1-1:1.0: 6 ports detected
[    6.390558] usb 2-1: New USB device found, idVendor=8087, idProduct=0024
[    6.391706] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    6.393209] hub 2-1:1.0: USB hub found
[    6.394534] hub 2-1:1.0: 8 ports detected
[    6.415139] random: crng init done
[    6.590812] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    6.749939] psmouse serio2: Failed to enable mouse on synaptics-pt/serio0

[    7.000430] ======================================================
[    7.001447] [ INFO: possible circular locking dependency detected ]
[    7.002453] 4.8.0-rc3+ #1 Not tainted
[    7.003420] -------------------------------------------------------
[    7.004366] kworker/0:1/45 is trying to acquire lock:
[    7.005291]  (s_active#41){++++.+}, at: [<ffffffff812675e5>] kernfs_remove_by_name_ns+0x45/0xa0
[    7.006243] 
               but task is already holding lock:
[    7.008074]  (psmouse_mutex){+.+.+.}, at: [<ffffffff815dedfc>] psmouse_disconnect+0x6c/0x150
[    7.009011] 
               which lock already depends on the new lock.

[    7.011753] 
               the existing dependency chain (in reverse order) is:
[    7.013576] 
               -> #1 (psmouse_mutex){+.+.+.}:
[    7.015456]        [<ffffffff810bbf42>] lock_acquire+0xb2/0x200
[    7.016400]        [<ffffffff8174a4c4>] mutex_lock_interruptible_nested+0x64/0x440
[    7.017340]        [<ffffffff815debb1>] psmouse_attr_set_helper+0x31/0x110
[    7.018292]        [<ffffffff8152e038>] dev_attr_store+0x18/0x30
[    7.019214]        [<ffffffff81268f25>] sysfs_kf_write+0x45/0x60
[    7.020125]        [<ffffffff812681d5>] kernfs_fop_write+0x135/0x1c0
[    7.021023]        [<ffffffff811e8358>] __vfs_write+0x28/0x120
[    7.021917]        [<ffffffff811e9498>] vfs_write+0xb8/0x1b0
[    7.022793]        [<ffffffff811ea7e9>] SyS_write+0x49/0xa0
[    7.023650]        [<ffffffff8174e9e9>] entry_SYSCALL_64_fastpath+0x1c/0xac
[    7.024500] 
               -> #0 (s_active#41){++++.+}:
[    7.026151]        [<ffffffff810bb8f9>] __lock_acquire+0x1249/0x1480
[    7.026995]        [<ffffffff810bbf42>] lock_acquire+0xb2/0x200
[    7.027845]        [<ffffffff81266795>] __kernfs_remove+0x225/0x2f0
[    7.028681]        [<ffffffff812675e5>] kernfs_remove_by_name_ns+0x45/0xa0
[    7.029517]        [<ffffffff81269f16>] remove_files.isra.1+0x36/0x70
[    7.030349]        [<ffffffff8126a2e4>] sysfs_remove_group+0x44/0x90
[    7.031185]        [<ffffffff815eae04>] trackpoint_disconnect+0x24/0x40
[    7.032014]        [<ffffffff815dee2a>] psmouse_disconnect+0x9a/0x150
[    7.032843]        [<ffffffff815cca52>] serio_disconnect_driver+0x32/0x40
[    7.033664]        [<ffffffff815cca75>] serio_driver_remove+0x15/0x20
[    7.034490]        [<ffffffff81532cf1>] __device_release_driver+0xa1/0x160
[    7.035316]        [<ffffffff81532dd5>] device_release_driver+0x25/0x40
[    7.036139]        [<ffffffff815ccdfa>] serio_disconnect_port+0x7a/0xb0
[    7.036955]        [<ffffffff815cd8d1>] serio_reconnect_subtree+0x51/0xb0
[    7.037762]        [<ffffffff815cdac2>] serio_handle_event+0x192/0x210
[    7.038568]        [<ffffffff810836d8>] process_one_work+0x1e8/0x740
[    7.039350]        [<ffffffff81083c78>] worker_thread+0x48/0x4e0
[    7.040111]        [<ffffffff8108a323>] kthread+0xf3/0x110
[    7.040863]        [<ffffffff8174ec2f>] ret_from_fork+0x1f/0x40
[    7.041610] 
               other info that might help us debug this:

[    7.043777]  Possible unsafe locking scenario:

[    7.045191]        CPU0                    CPU1
[    7.045883]        ----                    ----
[    7.046549]   lock(psmouse_mutex);
[    7.047216]                                lock(s_active#41);
[    7.047881]                                lock(psmouse_mutex);
[    7.048526]   lock(s_active#41);
[    7.049165] 
                *** DEADLOCK ***

[    7.051023] 6 locks held by kworker/0:1/45:
[    7.051638]  #0:  ("events_long"){.+.+.+}, at: [<ffffffff81083659>] process_one_work+0x169/0x740
[    7.052298]  #1:  (serio_event_work){+.+.+.}, at: [<ffffffff81083659>] process_one_work+0x169/0x740
[    7.052964]  #2:  (serio_mutex){+.+.+.}, at: [<ffffffff815cd950>] serio_handle_event+0x20/0x210
[    7.053633]  #3:  (&dev->mutex){......}, at: [<ffffffff81532dcd>] device_release_driver+0x1d/0x40
[    7.054312]  #4:  (&serio->drv_mutex){+.+.+.}, at: [<ffffffff815cca40>] serio_disconnect_driver+0x20/0x40
[    7.055002]  #5:  (psmouse_mutex){+.+.+.}, at: [<ffffffff815dedfc>] psmouse_disconnect+0x6c/0x150
[    7.055702] 
               stack backtrace:
[    7.057050] CPU: 0 PID: 45 Comm: kworker/0:1 Not tainted 4.8.0-rc3+ #1
[    7.057745] Hardware name: LENOVO 2320CTO/2320CTO, BIOS G2ET86WW (2.06 ) 11/13/2012
[    7.058462] Workqueue: events_long serio_handle_event
[    7.059179]  0000000000000000 ffff880213537a20 ffffffff81336955 ffffffff825e1190
[    7.059917]  ffffffff825e1190 ffff880213537a60 ffffffff810b8dd3 ffff880213537aa0
[    7.060657]  ffff880213540828 ffff880213540850 0000000000000006 ffff880213540760
[    7.061390] Call Trace:
[    7.062113]  [<ffffffff81336955>] dump_stack+0x67/0x92
[    7.062843]  [<ffffffff810b8dd3>] print_circular_bug+0x1e3/0x250
[    7.063576]  [<ffffffff810bb8f9>] __lock_acquire+0x1249/0x1480
[    7.064305]  [<ffffffff810ba20f>] ? mark_held_locks+0x6f/0xa0
[    7.065033]  [<ffffffff8174b7a8>] ? __mutex_unlock_slowpath+0xf8/0x1a0
[    7.065764]  [<ffffffff810bbf42>] lock_acquire+0xb2/0x200
[    7.066495]  [<ffffffff812675e5>] ? kernfs_remove_by_name_ns+0x45/0xa0
[    7.067229]  [<ffffffff81266795>] __kernfs_remove+0x225/0x2f0
[    7.067959]  [<ffffffff812675e5>] ? kernfs_remove_by_name_ns+0x45/0xa0
[    7.068691]  [<ffffffff812662c4>] ? kernfs_find_ns+0x94/0x140
[    7.069416]  [<ffffffff812675e5>] kernfs_remove_by_name_ns+0x45/0xa0
[    7.070148]  [<ffffffff81269f16>] remove_files.isra.1+0x36/0x70
[    7.070876]  [<ffffffff8126a2e4>] sysfs_remove_group+0x44/0x90
[    7.071605]  [<ffffffff815eae04>] trackpoint_disconnect+0x24/0x40
[    7.072334]  [<ffffffff815dee2a>] psmouse_disconnect+0x9a/0x150
[    7.073063]  [<ffffffff815cca52>] serio_disconnect_driver+0x32/0x40
[    7.073795]  [<ffffffff815cca75>] serio_driver_remove+0x15/0x20
[    7.074528]  [<ffffffff81532cf1>] __device_release_driver+0xa1/0x160
[    7.075260]  [<ffffffff81532dd5>] device_release_driver+0x25/0x40
[    7.075991]  [<ffffffff815ccdfa>] serio_disconnect_port+0x7a/0xb0
[    7.076721]  [<ffffffff815cd8d1>] serio_reconnect_subtree+0x51/0xb0
[    7.077451]  [<ffffffff815cdac2>] serio_handle_event+0x192/0x210
[    7.078183]  [<ffffffff810836d8>] process_one_work+0x1e8/0x740
[    7.078919]  [<ffffffff81083659>] ? process_one_work+0x169/0x740
[    7.079663]  [<ffffffff81083c78>] worker_thread+0x48/0x4e0
[    7.080407]  [<ffffffff81748119>] ? schedule+0x49/0xa0
[    7.081148]  [<ffffffff81091201>] ? preempt_count_sub+0xa1/0x110
[    7.081901]  [<ffffffff81083c30>] ? process_one_work+0x740/0x740
[    7.082649]  [<ffffffff8108a323>] kthread+0xf3/0x110
[    7.083397]  [<ffffffff8174ec2f>] ret_from_fork+0x1f/0x40
[    7.084152]  [<ffffffff8108a230>] ? kthread_create_on_node+0x230/0x230
[    7.391560] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23) initialised: dm-devel@xxxxxxxxxx
[    7.412104] loop: module loaded
[    7.771919] psmouse serio2: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 3/3
[    7.961843] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/serio2/input/input18
[    8.474792] input: ACPI Virtual Keyboard Device as /devices/virtual/input/input19

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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