On 01/09/16 08:53, Richard van der Hoff wrote:
On 30/08/16 21:52, Richard van der Hoff wrote:
On 30/08/16 19:48, Alan Stern wrote:
On Tue, 30 Aug 2016, Richard van der Hoff wrote:
I have a USB-3.1 dock; sometimes I see a kernel panic when I unplug it,
which hangs the entire system. It appears that the first unplug is
successful; the second one normally triggers a crash.
Please try applying the patch at the bottom of this email:
http://marc.info/?l=linux-usb&m=147195533502706&w=2
There's a good chance it will fix your problem.
Is there a plan to merge this patch? It certainly seems to help.
I'm still seeing occasional problems. For example, when I unplugged the
dock last night, it seems to have wedged some things, and then plugging
it back in didn't work. See some logs below.
-----
Unplug event:
Sep 6 22:18:31 fred kernel: [45179.725142] usb 3-1: USB disconnect,
device number 2
Sep 6 22:18:31 fred kernel: [45179.725155] usb 3-1.1: USB disconnect,
device number 3
Sep 6 22:18:31 fred kernel: [45179.725163] usb 3-1.1.3: USB disconnect,
device number 5
Sep 6 22:18:31 fred kernel: [45179.828933] ACPI: \_SB_.PCI0.RP01:
acpiphp_glue: Bus check in hotplug_event()
Sep 6 22:18:31 fred kernel: [45179.828970] xhci_hcd 0000:05:00.0:
remove, state 1
Sep 6 22:18:31 fred kernel: [45179.828977] usb usb4: USB disconnect,
device number 1
Sep 6 22:18:31 fred kernel: [45179.828978] usb 4-1: USB disconnect,
device number 2
Sep 6 22:18:31 fred kernel: [45179.828980] usb 4-1.1: USB disconnect,
device number 3
Sep 6 22:18:31 fred kernel: [45179.828981] usb 4-1.1.4: USB disconnect,
device number 4
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4160]
policy: set 'NextDoorBut1' (wlp58s0) as default for IPv6 routing and DNS
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4162]
policy: set 'NextDoorBut1' (wlp58s0) as default for IPv4 routing and DNS
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4165]
dns-mgr: Writing DNS information to /sbin/resolvconf
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4298]
device (enx00249b194c4f): state change: activated -> unmanaged (reason
'removed') [100 10 36]
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4460]
dhcp4 (enx00249b194c4f): canceled DHCP transaction, DHCP client pid 1511
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4460]
dhcp4 (enx00249b194c4f): state changed bound -> done
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4466]
dns-mgr: Writing DNS information to /sbin/resolvconf
Sep 6 22:18:31 fred kernel: [45179.904348] xhci_hcd 0000:05:00.0: Host
not halted after 16000 microseconds.
Sep 6 22:18:31 fred kernel: [45179.905353] xhci_hcd 0000:05:00.0: USB
bus 4 deregistered
Sep 6 22:18:31 fred kernel: [45179.905358] xhci_hcd 0000:05:00.0:
remove, state 1
Sep 6 22:18:31 fred kernel: [45179.905365] usb usb3: USB disconnect,
device number 1
Sep 6 22:18:31 fred NetworkManager[787]: <error> [1473196711.4863]
platform-linux: do-change-link[2]: failure changing link: failure 19 (No
such device)
Sep 6 22:18:31 fred NetworkManager[787]: <warn> [1473196711.4867]
device (enx00249b194c4f): failed to disable userspace IPv6LL address
handling
Sep 6 22:18:31 fred NetworkManager[787]: <info> [1473196711.4876]
devices removed (path:
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/0000:02:02.0/0000:05:00.0/usb4/4-1/4-1.1/4-1.1.4/4-1.1.4:1.0/net/enx00249b194c4f,
iface: enx00249b194c4f)
Sep 6 22:18:31 fred kernel: [45180.318888] usb 1-2: USB disconnect,
device number 3
Sep 6 22:18:43 fred kernel: [45191.592455] INFO: task kworker/2:1:18920
blocked for more than 10 seconds.
Sep 6 22:18:43 fred kernel: [45191.592468] Tainted: G W
4.7.0-35b16da #19
Sep 6 22:18:43 fred kernel: [45191.592472] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 6 22:18:43 fred kernel: [45191.592478] kworker/2:1 D
ffff88025669b9f0 0 18920 2 0x00000000
Sep 6 22:18:43 fred kernel: [45191.592503] Workqueue: usb_hub_wq hub_event
Sep 6 22:18:43 fred kernel: [45191.592511] ffff88025669b9f0
ffff8804659f1d80 ffff88046c72bd00 ffff8802d0ef3d00
Sep 6 22:18:43 fred kernel: [45191.592521] ffff88025669b9d0
ffff88025669c000 ffff8804651017f8 ffffffff82214cf4
Sep 6 22:18:43 fred kernel: [45191.592530] ffff8804659f1d80
0000000000000204 ffff88025669ba08 ffffffff81855fa5
Sep 6 22:18:43 fred kernel: [45191.592539] Call Trace:
Sep 6 22:18:43 fred kernel: [45191.592558] [<ffffffff81855fa5>]
schedule+0x35/0x80
Sep 6 22:18:43 fred kernel: [45191.592568] [<ffffffff8163433d>]
usb_kill_urb+0x8d/0xc0
Sep 6 22:18:43 fred kernel: [45191.592583] [<ffffffff810c4490>] ?
wake_atomic_t_function+0x60/0x60
Sep 6 22:18:43 fred kernel: [45191.592593] [<ffffffff81633076>]
usb_hcd_flush_endpoint+0x126/0x190
Sep 6 22:18:43 fred kernel: [45191.592604] [<ffffffff81635fbb>]
usb_disable_endpoint+0x9b/0xb0
Sep 6 22:18:43 fred kernel: [45191.592613] [<ffffffff81636015>]
usb_disable_interface+0x45/0x60
Sep 6 22:18:43 fred kernel: [45191.592627] [<ffffffff81638a2b>]
usb_unbind_interface+0x1bb/0x280
Sep 6 22:18:43 fred kernel: [45191.592638] [<ffffffff8156bfb1>]
__device_release_driver+0xa1/0x160
Sep 6 22:18:43 fred kernel: [45191.592644] [<ffffffff8156c093>]
device_release_driver+0x23/0x30
Sep 6 22:18:43 fred kernel: [45191.592651] [<ffffffff8156b611>]
bus_remove_device+0x101/0x170
Sep 6 22:18:43 fred kernel: [45191.592662] [<ffffffff81567769>]
device_del+0x139/0x260
Sep 6 22:18:43 fred kernel: [45191.592671] [<ffffffff8163d34f>] ?
usb_remove_ep_devs+0x1f/0x30
Sep 6 22:18:43 fred kernel: [45191.592681] [<ffffffff816360b9>]
usb_disable_device+0x89/0x270
Sep 6 22:18:43 fred kernel: [45191.592690] [<ffffffff8162b992>]
usb_disconnect+0x92/0x280
Sep 6 22:18:43 fred kernel: [45191.592698] [<ffffffff8162baf9>]
usb_disconnect+0x1f9/0x280
Sep 6 22:18:43 fred kernel: [45191.592706] [<ffffffff8162baf9>]
usb_disconnect+0x1f9/0x280
Sep 6 22:18:43 fred kernel: [45191.592714] [<ffffffff8162dbc4>]
hub_event+0x744/0x1560
Sep 6 22:18:43 fred kernel: [45191.592723] [<ffffffff810b75bf>] ?
dequeue_task_fair+0x53f/0x960
Sep 6 22:18:43 fred kernel: [45191.592736] [<ffffffff8109a9bb>]
process_one_work+0x16b/0x480
Sep 6 22:18:43 fred kernel: [45191.592746] [<ffffffff8109ad1b>]
worker_thread+0x4b/0x500
Sep 6 22:18:43 fred kernel: [45191.592757] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 6 22:18:43 fred kernel: [45191.592767] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 6 22:18:43 fred kernel: [45191.592775] [<ffffffff810a0f28>]
kthread+0xd8/0xf0
Sep 6 22:18:43 fred kernel: [45191.592786] [<ffffffff8185a51f>]
ret_from_fork+0x1f/0x40
Sep 6 22:18:43 fred kernel: [45191.592795] [<ffffffff810a0e50>] ?
kthread_create_on_node+0x1a0/0x1a0
Sep 6 22:18:43 fred kernel: [45191.592803] INFO: task
kworker/u8:0:19227 blocked for more than 10 seconds.
Sep 6 22:18:43 fred kernel: [45191.592809] Tainted: G W
4.7.0-35b16da #19
Sep 6 22:18:43 fred kernel: [45191.592812] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Sep 6 22:18:43 fred kernel: [45191.592817] kworker/u8:0 D
ffff88020855bac8 0 19227 2 0x00000000
Sep 6 22:18:43 fred kernel: [45191.592837] Workqueue: kacpi_hotplug
acpi_hotplug_work_fn
Sep 6 22:18:43 fred kernel: [45191.592842] ffff88020855bac8
ffff88020855bbc8 ffff880469582dc0 ffff88038e2e2dc0
Sep 6 22:18:43 fred kernel: [45191.592850] ffff880200000030
ffff88020855c000 ffff880465f740fc ffff88038e2e2dc0
Sep 6 22:18:43 fred kernel: [45191.592859] 00000000ffffffff
ffff880465f74100 ffff88020855bae0 ffffffff81855fa5
Sep 6 22:18:43 fred kernel: [45191.592867] Call Trace:
Sep 6 22:18:43 fred kernel: [45191.592877] [<ffffffff81855fa5>]
schedule+0x35/0x80
Sep 6 22:18:43 fred kernel: [45191.592886] [<ffffffff8185624e>]
schedule_preempt_disabled+0xe/0x10
Sep 6 22:18:43 fred kernel: [45191.592897] [<ffffffff81857ea9>]
__mutex_lock_slowpath+0xb9/0x130
Sep 6 22:18:43 fred kernel: [45191.592907] [<ffffffff81857f3f>]
mutex_lock+0x1f/0x30
Sep 6 22:18:43 fred kernel: [45191.592914] [<ffffffff8162b951>]
usb_disconnect+0x51/0x280
Sep 6 22:18:43 fred kernel: [45191.592924] [<ffffffff816314f0>]
usb_remove_hcd+0xd0/0x240
Sep 6 22:18:43 fred kernel: [45191.592935] [<ffffffff8164416f>]
usb_hcd_pci_remove+0x6f/0x140
Sep 6 22:18:43 fred kernel: [45191.592944] [<ffffffff81687485>]
xhci_pci_remove+0x55/0x70
Sep 6 22:18:43 fred kernel: [45191.592957] [<ffffffff81441649>]
pci_device_remove+0x39/0xc0
Sep 6 22:18:43 fred kernel: [45191.592964] [<ffffffff8156bfb1>]
__device_release_driver+0xa1/0x160
Sep 6 22:18:43 fred kernel: [45191.592971] [<ffffffff8156c093>]
device_release_driver+0x23/0x30
Sep 6 22:18:43 fred kernel: [45191.592979] [<ffffffff81439e5a>]
pci_stop_bus_device+0x8a/0xa0
Sep 6 22:18:43 fred kernel: [45191.592986] [<ffffffff81439e01>]
pci_stop_bus_device+0x31/0xa0
Sep 6 22:18:43 fred kernel: [45191.592992] [<ffffffff81439e01>]
pci_stop_bus_device+0x31/0xa0
Sep 6 22:18:43 fred kernel: [45191.593000] [<ffffffff81439f82>]
pci_stop_and_remove_bus_device+0x12/0x20
Sep 6 22:18:43 fred kernel: [45191.593011] [<ffffffff8145460f>]
disable_slot+0x4f/0xa0
Sep 6 22:18:43 fred kernel: [45191.593021] [<ffffffff81454d75>]
acpiphp_check_bridge.part.8+0xd5/0xf0
Sep 6 22:18:43 fred kernel: [45191.593030] [<ffffffff814555d4>]
acpiphp_hotplug_notify+0x174/0x250
Sep 6 22:18:43 fred kernel: [45191.593040] [<ffffffff81455460>] ?
free_bridge+0x110/0x110
Sep 6 22:18:43 fred kernel: [45191.593051] [<ffffffff814853a8>]
acpi_device_hotplug+0x3fa/0x456
Sep 6 22:18:43 fred kernel: [45191.593062] [<ffffffff8147d4a0>]
acpi_hotplug_work_fn+0x1e/0x29
Sep 6 22:18:43 fred kernel: [45191.593073] [<ffffffff8109a9bb>]
process_one_work+0x16b/0x480
Sep 6 22:18:43 fred kernel: [45191.593083] [<ffffffff8109ad1b>]
worker_thread+0x4b/0x500
Sep 6 22:18:43 fred kernel: [45191.593093] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 6 22:18:43 fred kernel: [45191.593103] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 6 22:18:43 fred kernel: [45191.593111] [<ffffffff810a0f28>]
kthread+0xd8/0xf0
Sep 6 22:18:43 fred kernel: [45191.593118] [<ffffffff8185a51f>]
ret_from_fork+0x1f/0x40
Sep 6 22:18:43 fred kernel: [45191.593127] [<ffffffff810a0e50>] ?
kthread_create_on_node+0x1a0/0x1a0
<repeats several times>
----
I ran a show-blocked-tasks after plugging the dock back in:
Sep 7 09:03:30 fred kernel: [83879.382761] sysrq: SysRq : Show Blocked
State
Sep 7 09:03:30 fred kernel: [83879.382778] task
PC stack pid father
Sep 7 09:03:30 fred kernel: [83879.383327] kworker/2:1 D
ffff88025669b9f0 0 18920 2 0x00000000
Sep 7 09:03:30 fred kernel: [83879.383356] Workqueue: usb_hub_wq hub_event
Sep 7 09:03:30 fred kernel: [83879.383363] ffff88025669b9f0
ffff8804659f1d80 ffff88046c72bd00 ffff8802d0ef3d00
Sep 7 09:03:30 fred kernel: [83879.383374] ffff88025669b9d0
ffff88025669c000 ffff8804651017f8 ffffffff82214cf4
Sep 7 09:03:30 fred kernel: [83879.383385] ffff8804659f1d80
0000000000000204 ffff88025669ba08 ffffffff81855fa5
Sep 7 09:03:30 fred kernel: [83879.383395] Call Trace:
Sep 7 09:03:30 fred kernel: [83879.383416] [<ffffffff81855fa5>]
schedule+0x35/0x80
Sep 7 09:03:30 fred kernel: [83879.383427] [<ffffffff8163433d>]
usb_kill_urb+0x8d/0xc0
Sep 7 09:03:30 fred kernel: [83879.383444] [<ffffffff810c4490>] ?
wake_atomic_t_function+0x60/0x60
Sep 7 09:03:30 fred kernel: [83879.383454] [<ffffffff81633076>]
usb_hcd_flush_endpoint+0x126/0x190
Sep 7 09:03:30 fred kernel: [83879.383465] [<ffffffff81635fbb>]
usb_disable_endpoint+0x9b/0xb0
Sep 7 09:03:30 fred kernel: [83879.383475] [<ffffffff81636015>]
usb_disable_interface+0x45/0x60
Sep 7 09:03:30 fred kernel: [83879.383490] [<ffffffff81638a2b>]
usb_unbind_interface+0x1bb/0x280
Sep 7 09:03:30 fred kernel: [83879.383500] [<ffffffff8156bfb1>]
__device_release_driver+0xa1/0x160
Sep 7 09:03:30 fred kernel: [83879.383508] [<ffffffff8156c093>]
device_release_driver+0x23/0x30
Sep 7 09:03:30 fred kernel: [83879.383514] [<ffffffff8156b611>]
bus_remove_device+0x101/0x170
Sep 7 09:03:30 fred kernel: [83879.383525] [<ffffffff81567769>]
device_del+0x139/0x260
Sep 7 09:03:30 fred kernel: [83879.383535] [<ffffffff8163d34f>] ?
usb_remove_ep_devs+0x1f/0x30
Sep 7 09:03:30 fred kernel: [83879.383545] [<ffffffff816360b9>]
usb_disable_device+0x89/0x270
Sep 7 09:03:30 fred kernel: [83879.383554] [<ffffffff8162b992>]
usb_disconnect+0x92/0x280
Sep 7 09:03:30 fred kernel: [83879.383562] [<ffffffff8162baf9>]
usb_disconnect+0x1f9/0x280
Sep 7 09:03:30 fred kernel: [83879.383570] [<ffffffff8162baf9>]
usb_disconnect+0x1f9/0x280
Sep 7 09:03:30 fred kernel: [83879.383579] [<ffffffff8162dbc4>]
hub_event+0x744/0x1560
Sep 7 09:03:30 fred kernel: [83879.383587] [<ffffffff810b75bf>] ?
dequeue_task_fair+0x53f/0x960
Sep 7 09:03:30 fred kernel: [83879.383600] [<ffffffff8109a9bb>]
process_one_work+0x16b/0x480
Sep 7 09:03:30 fred kernel: [83879.383611] [<ffffffff8109ad1b>]
worker_thread+0x4b/0x500
Sep 7 09:03:30 fred kernel: [83879.383621] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 7 09:03:30 fred kernel: [83879.383631] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 7 09:03:30 fred kernel: [83879.383640] [<ffffffff810a0f28>]
kthread+0xd8/0xf0
Sep 7 09:03:30 fred kernel: [83879.383648] [<ffffffff8185a51f>]
ret_from_fork+0x1f/0x40
Sep 7 09:03:30 fred kernel: [83879.383657] [<ffffffff810a0e50>] ?
kthread_create_on_node+0x1a0/0x1a0
Sep 7 09:03:30 fred kernel: [83879.383665] kworker/u8:0 D
ffff88020855bac8 0 19227 2 0x00000000
Sep 7 09:03:30 fred kernel: [83879.383686] Workqueue: kacpi_hotplug
acpi_hotplug_work_fn
Sep 7 09:03:30 fred kernel: [83879.383691] ffff88020855bac8
ffff88020855bbc8 ffff880469582dc0 ffff88038e2e2dc0
Sep 7 09:03:30 fred kernel: [83879.383700] ffff880200000030
ffff88020855c000 ffff880465f740fc ffff88038e2e2dc0
Sep 7 09:03:30 fred kernel: [83879.383708] 00000000ffffffff
ffff880465f74100 ffff88020855bae0 ffffffff81855fa5
Sep 7 09:03:30 fred kernel: [83879.383717] Call Trace:
Sep 7 09:03:30 fred kernel: [83879.383728] [<ffffffff81855fa5>]
schedule+0x35/0x80
Sep 7 09:03:30 fred kernel: [83879.383738] [<ffffffff8185624e>]
schedule_preempt_disabled+0xe/0x10
Sep 7 09:03:30 fred kernel: [83879.383748] [<ffffffff81857ea9>]
__mutex_lock_slowpath+0xb9/0x130
Sep 7 09:03:30 fred kernel: [83879.383758] [<ffffffff81857f3f>]
mutex_lock+0x1f/0x30
Sep 7 09:03:30 fred kernel: [83879.383766] [<ffffffff8162b951>]
usb_disconnect+0x51/0x280
Sep 7 09:03:30 fred kernel: [83879.383776] [<ffffffff816314f0>]
usb_remove_hcd+0xd0/0x240
Sep 7 09:03:30 fred kernel: [83879.383786] [<ffffffff8164416f>]
usb_hcd_pci_remove+0x6f/0x140
Sep 7 09:03:30 fred kernel: [83879.383795] [<ffffffff81687485>]
xhci_pci_remove+0x55/0x70
Sep 7 09:03:30 fred kernel: [83879.383809] [<ffffffff81441649>]
pci_device_remove+0x39/0xc0
Sep 7 09:03:30 fred kernel: [83879.383816] [<ffffffff8156bfb1>]
__device_release_driver+0xa1/0x160
Sep 7 09:03:30 fred kernel: [83879.383823] [<ffffffff8156c093>]
device_release_driver+0x23/0x30
Sep 7 09:03:30 fred kernel: [83879.383831] [<ffffffff81439e5a>]
pci_stop_bus_device+0x8a/0xa0
Sep 7 09:03:30 fred kernel: [83879.383838] [<ffffffff81439e01>]
pci_stop_bus_device+0x31/0xa0
Sep 7 09:03:30 fred kernel: [83879.383844] [<ffffffff81439e01>]
pci_stop_bus_device+0x31/0xa0
Sep 7 09:03:30 fred kernel: [83879.383851] [<ffffffff81439f82>]
pci_stop_and_remove_bus_device+0x12/0x20
Sep 7 09:03:30 fred kernel: [83879.383862] [<ffffffff8145460f>]
disable_slot+0x4f/0xa0
Sep 7 09:03:30 fred kernel: [83879.383871] [<ffffffff81454d75>]
acpiphp_check_bridge.part.8+0xd5/0xf0
Sep 7 09:03:30 fred kernel: [83879.383881] [<ffffffff814555d4>]
acpiphp_hotplug_notify+0x174/0x250
Sep 7 09:03:30 fred kernel: [83879.383890] [<ffffffff81455460>] ?
free_bridge+0x110/0x110
Sep 7 09:03:30 fred kernel: [83879.383902] [<ffffffff814853a8>]
acpi_device_hotplug+0x3fa/0x456
Sep 7 09:03:30 fred kernel: [83879.383913] [<ffffffff8147d4a0>]
acpi_hotplug_work_fn+0x1e/0x29
Sep 7 09:03:30 fred kernel: [83879.383923] [<ffffffff8109a9bb>]
process_one_work+0x16b/0x480
Sep 7 09:03:30 fred kernel: [83879.383934] [<ffffffff8109ad1b>]
worker_thread+0x4b/0x500
Sep 7 09:03:30 fred kernel: [83879.383944] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 7 09:03:30 fred kernel: [83879.383954] [<ffffffff8109acd0>] ?
process_one_work+0x480/0x480
Sep 7 09:03:30 fred kernel: [83879.383962] [<ffffffff810a0f28>]
kthread+0xd8/0xf0
Sep 7 09:03:30 fred kernel: [83879.383970] [<ffffffff8185a51f>]
ret_from_fork+0x1f/0x40
Sep 7 09:03:30 fred kernel: [83879.383979] [<ffffffff810a0e50>] ?
kthread_create_on_node+0x1a0/0x1a0
Sep 7 09:03:30 fred kernel: [83879.384090] lsusb D
ffff88025716fb58 0 20060 20041 0x00000004
Sep 7 09:03:30 fred kernel: [83879.384099] ffff88025716fb58
ffff88047ec97e00 ffff88046c72bd00 ffff88038e2c8000
Sep 7 09:03:30 fred kernel: [83879.384108] 0000000000000000
ffff880257170000 ffff880465d9d8fc ffff88038e2c8000
Sep 7 09:03:30 fred kernel: [83879.384116] 00000000ffffffff
ffff880465d9d900 ffff88025716fb70 ffffffff81855fa5
Sep 7 09:03:30 fred kernel: [83879.384125] Call Trace:
Sep 7 09:03:30 fred kernel: [83879.384135] [<ffffffff81855fa5>]
schedule+0x35/0x80
Sep 7 09:03:30 fred kernel: [83879.384144] [<ffffffff8185624e>]
schedule_preempt_disabled+0xe/0x10
Sep 7 09:03:30 fred kernel: [83879.384154] [<ffffffff81857ea9>]
__mutex_lock_slowpath+0xb9/0x130
Sep 7 09:03:30 fred kernel: [83879.384164] [<ffffffff81857f3f>]
mutex_lock+0x1f/0x30
Sep 7 09:03:30 fred kernel: [83879.384174] [<ffffffff8163f912>]
usbdev_open+0xd2/0x220
Sep 7 09:03:30 fred kernel: [83879.384183] [<ffffffff812222ef>]
chrdev_open+0xbf/0x1b0
Sep 7 09:03:30 fred kernel: [83879.384192] [<ffffffff8121a773>]
do_dentry_open+0x203/0x310
Sep 7 09:03:30 fred kernel: [83879.384198] [<ffffffff81222230>] ?
cdev_put+0x30/0x30
Sep 7 09:03:30 fred kernel: [83879.384206] [<ffffffff8121bc44>]
vfs_open+0x54/0x80
Sep 7 09:03:30 fred kernel: [83879.384216] [<ffffffff812285fc>] ?
may_open+0x8c/0x100
Sep 7 09:03:30 fred kernel: [83879.384226] [<ffffffff8122bf3b>]
path_openat+0x2eb/0x1440
Sep 7 09:03:30 fred kernel: [83879.384237] [<ffffffff81507bfb>] ?
tty_flip_buffer_push+0x2b/0x30
Sep 7 09:03:30 fred kernel: [83879.384249] [<ffffffff810c3e54>] ?
__wake_up+0x44/0x50
Sep 7 09:03:30 fred kernel: [83879.384260] [<ffffffff8122e321>]
do_filp_open+0x91/0x100
Sep 7 09:03:30 fred kernel: [83879.384269] [<ffffffff8121c367>] ?
__vfs_write+0x37/0x160
Sep 7 09:03:30 fred kernel: [83879.384281] [<ffffffff8123ca06>] ?
__alloc_fd+0x46/0x190
Sep 7 09:03:30 fred kernel: [83879.384289] [<ffffffff8121bfe4>]
do_sys_open+0x124/0x210
Sep 7 09:03:30 fred kernel: [83879.384298] [<ffffffff8121c0ee>]
SyS_open+0x1e/0x20
Sep 7 09:03:30 fred kernel: [83879.384305] [<ffffffff8185a2f6>]
entry_SYSCALL_64_fastpath+0x1e/0xa8
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