On Jul 07 Stefan Richter wrote:
> It appears to be a regression from -rc4 to -rc6. At the second occasion
> that I switched the monitor off while running 3.0-rc6, the same happened
> again. (IOW judging from the mere two tries I did so far, this issue is
> 100% reproducible.)
>
> khubd locked up; no subsequent device re-attachments were recognized;
> only an USB mouse that was attached to a motherboard USB port already
> before the deadlock continued to let me move the pointer.
Sarah, "gitk v3.0-rc4.. drivers/usb/core/" makes it look like this is from
commit fccf4e86200b8f5edd9a65da26f150e32ba79808. When I find spare time I
will test 3.0-rc6 with that one reverted.
> Jul 7 15:08:41 stein kernel: usb 1-3.2: USB disconnect, device number 4
> Jul 7 15:08:41 stein kernel: generic-usb 0003:1267:0103.0006: can't reset device, 0000:00:12.2-3.3/input1, status -71
> Jul 7 15:08:41 stein kernel: usb 1-3: clear tt 3 (0050) error -71
> Jul 7 15:08:41 stein kernel: generic-usb 0003:1267:0103.0005: can't reset device, 0000:00:12.2-3.3/input0, status -71
> Jul 7 15:08:41 stein kernel: usb 1-3: clear tt 3 (0050) error -71
> Jul 7 15:08:41 stein kernel: generic-usb 0003:1267:0103.0006: can't reset device, 0000:00:12.2-3.3/input1, status -71
> Jul 7 15:08:41 stein kernel: hub 1-3:1.0: hub_port_status failed (err = -71)
> Jul 7 15:08:41 stein kernel: hub 1-3:1.0: connect-debounce failed, port 2 disabled
> Jul 7 15:08:41 stein kernel: usb 1-3: USB disconnect, device number 2
> Jul 7 15:08:41 stein kernel: usb 1-3.1: USB disconnect, device number 3
> Jul 7 15:08:41 stein kernel: usb 1-3.1.1: USB disconnect, device number 6
> Jul 7 15:08:41 stein kernel: usb 1-3: clear tt 3 (0050) error -71
> Jul 7 15:08:41 stein kernel: generic-usb 0003:1267:0103.0005: can't reset device, 0000:00:12.2-3.3/input0, status -71
> Jul 7 15:08:41 stein kernel: usb 1-3: clear tt 3 (0050) error -19
> Jul 7 15:08:41 stein kernel: generic-usb 0003:1267:0103.0006: can't reset device, 0000:00:12.2-3.3/input1, status -71
> Jul 7 15:08:41 stein kernel: usb 1-3: clear tt 3 (0050) error -19
> Jul 7 15:08:41 stein kernel: usb 1-3.3: USB disconnect, device number 5
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: =============================================
> Jul 7 15:08:42 stein kernel: [ INFO: possible recursive locking detected ]
> Jul 7 15:08:42 stein kernel: 3.0.0-rc6 #9
> Jul 7 15:08:42 stein kernel: ---------------------------------------------
> Jul 7 15:08:42 stein kernel: khubd/303 is trying to acquire lock:
> Jul 7 15:08:42 stein kernel: (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffff8129f588>] usb_set_interface+0x84/0x210
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: but task is already holding lock:
> Jul 7 15:08:42 stein kernel: (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffff81299d7d>] usb_disconnect+0x9a/0x140
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: other info that might help us debug this:
> Jul 7 15:08:42 stein kernel: Possible unsafe locking scenario:
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: CPU0
> Jul 7 15:08:42 stein kernel: ----
> Jul 7 15:08:42 stein kernel: lock(hcd->bandwidth_mutex);
> Jul 7 15:08:42 stein kernel: lock(hcd->bandwidth_mutex);
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: *** DEADLOCK ***
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: May be due to missing lock nesting notation
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: 4 locks held by khubd/303:
> Jul 7 15:08:42 stein kernel: #0: (&__lockdep_no_validate__){+.+.+.}, at: [<ffffffff8129a891>] hub_thread+0xdf/0xe5a
> Jul 7 15:08:42 stein kernel: #1: (&__lockdep_no_validate__){+.+.+.}, at: [<ffffffff81299d3c>] usb_disconnect+0x59/0x140
> Jul 7 15:08:42 stein kernel: #2: (hcd->bandwidth_mutex){+.+.+.}, at: [<ffffffff81299d7d>] usb_disconnect+0x9a/0x140
> Jul 7 15:08:42 stein kernel: #3: (&__lockdep_no_validate__){+.+.+.}, at: [<ffffffff812674fe>] device_release_driver+0x18/0x2d
> Jul 7 15:08:42 stein kernel:
> Jul 7 15:08:42 stein kernel: stack backtrace:
> Jul 7 15:08:42 stein kernel: Pid: 303, comm: khubd Not tainted 3.0.0-rc6 #9
> Jul 7 15:08:42 stein kernel: Call Trace:
> Jul 7 15:08:42 stein kernel: [<ffffffff8105cfaf>] __lock_acquire+0x169b/0x1734
> Jul 7 15:08:42 stein kernel: [<ffffffff8105a1ff>] ? mark_held_locks+0x52/0x70
> Jul 7 15:08:42 stein kernel: [<ffffffff8102e603>] ? sub_preempt_count+0x92/0xa6
> Jul 7 15:08:42 stein kernel: [<ffffffff8134fcc1>] ? _raw_spin_unlock_irq+0x36/0x53
> Jul 7 15:08:42 stein kernel: [<ffffffff810465eb>] ? wait_on_cpu_work+0x6a/0x99
> Jul 7 15:08:42 stein kernel: [<ffffffff8129f588>] ? usb_set_interface+0x84/0x210
> Jul 7 15:08:42 stein kernel: [<ffffffff8105d471>] lock_acquire+0x57/0x6d
> Jul 7 15:08:42 stein kernel: [<ffffffff8129f588>] ? usb_set_interface+0x84/0x210
> Jul 7 15:08:42 stein kernel: [<ffffffff8102e6c4>] ? add_preempt_count+0xad/0xb2
> Jul 7 15:08:42 stein kernel: [<ffffffff8134e711>] mutex_lock_nested+0x5e/0x2f9
> Jul 7 15:08:42 stein kernel: [<ffffffff8129f588>] ? usb_set_interface+0x84/0x210
> Jul 7 15:08:42 stein kernel: [<ffffffff810466e1>] ? wait_on_work+0xc7/0x115
> Jul 7 15:08:42 stein kernel: [<ffffffff8104661a>] ? wait_on_cpu_work+0x99/0x99
> Jul 7 15:08:42 stein kernel: [<ffffffff8129f588>] usb_set_interface+0x84/0x210
> Jul 7 15:08:42 stein kernel: [<ffffffff81046803>] ? __cancel_work_timer+0xd4/0x11d
> Jul 7 15:08:42 stein kernel: [<ffffffff812a099b>] usb_unbind_interface+0x93/0xd1
> Jul 7 15:08:42 stein kernel: [<ffffffff812673e6>] __device_release_driver+0x67/0xb0
> Jul 7 15:08:42 stein kernel: [<ffffffff81267506>] device_release_driver+0x20/0x2d
> Jul 7 15:08:42 stein kernel: [<ffffffff81266a24>] bus_remove_device+0xb1/0xc6
> Jul 7 15:08:42 stein kernel: [<ffffffff812654fa>] device_del+0x11b/0x187
> Jul 7 15:08:42 stein kernel: [<ffffffff8129e81b>] usb_disable_device+0x55/0x14b
> Jul 7 15:08:42 stein kernel: [<ffffffff81299d87>] usb_disconnect+0xa4/0x140
> Jul 7 15:08:42 stein kernel: [<ffffffff8129acef>] hub_thread+0x53d/0xe5a
> Jul 7 15:08:42 stein kernel: [<ffffffff8134d259>] ? schedule+0x878/0x8b0
> Jul 7 15:08:42 stein kernel: [<ffffffff8134ccf0>] ? schedule+0x30f/0x8b0
> Jul 7 15:08:42 stein kernel: [<ffffffff8104b06d>] ? wake_up_bit+0x25/0x25
> Jul 7 15:08:42 stein kernel: [<ffffffff8134fd24>] ? _raw_spin_unlock_irqrestore+0x46/0x64
> Jul 7 15:08:42 stein kernel: [<ffffffff8129a7b2>] ? hub_probe+0x7f3/0x7f3
> Jul 7 15:08:42 stein kernel: [<ffffffff8104acca>] kthread+0x7d/0x85
> Jul 7 15:08:42 stein kernel: [<ffffffff81351594>] kernel_thread_helper+0x4/0x10
> Jul 7 15:08:42 stein kernel: [<ffffffff8102e4f5>] ? finish_task_switch+0x42/0xbe
> Jul 7 15:08:42 stein kernel: [<ffffffff813500c4>] ? retint_restore_args+0xe/0xe
> Jul 7 15:08:42 stein kernel: [<ffffffff8104ac4d>] ? __init_kthread_worker+0x56/0x56
> Jul 7 15:08:42 stein kernel: [<ffffffff81351590>] ? gs_change+0xb/0xb
>
--
Stefan Richter
-=====-==-== -=== --===
http://arcgraph.de/sr/
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