After removing dvb-t usb stick (MSI Digivox duo, af9015 based)usb subsystem hangs

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After removing dvb-t usb stick usb subsystem hangs and dmesg shows Call traces.
lsusb hangs so ubuntu-bug hangs also.
No further usb devices are recognised.

Versions:
Linux cubu 2.6.32-18-generic #27-Ubuntu SMP Fri Mar 26 21:13:44 UTC 2010 x86_64 GNU/Linux
Ubuntu 2.6.32-18.27-generic 2.6.32.10+drm33.1
Description: Ubuntu lucid (development branch)
Release: 10.04

Insert of stick:

[43167.500793] usb 1-7.2: new high speed USB device using ehci_hcd and address 6
[43167.614342] usb 1-7.2: configuration #1 chosen from 1 choice
[43167.699517] dvb-usb: found a 'MSI DIGIVOX Duo' in cold state, will try to load a firmware
[43167.699529] usb 1-7.2: firmware: requesting dvb-usb-af9015.fw
[43167.707574] dvb-usb: downloading firmware from file 'dvb-usb-af9015.fw'
[43167.775644] dvb-usb: found a 'MSI DIGIVOX Duo' in warm state.
[43167.775730] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[43167.776825] DVB: registering new adapter (MSI DIGIVOX Duo)
[43168.153241] af9013: firmware version:4.95.0
[43168.156493] DVB: registering adapter 0 frontend 0 (Afatech AF9013 DVB-T)...
[43168.186332] MXL5005S: Attached at address 0xc6
[43168.186339] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[43168.186819] DVB: registering new adapter (MSI DIGIVOX Duo)
[43168.911829] af9013: found a 'Afatech AF9013 DVB-T' in warm state.
[43168.914448] af9013: firmware version:4.95.0
[43168.925831] DVB: registering adapter 1 frontend 0 (Afatech AF9013 DVB-T)...
[43168.926169] MXL5005S: Attached at address 0xc6
[43168.926177] dvb-usb: MSI DIGIVOX Duo successfully initialized and connected.
[43168.935130] usbcore: registered new interface driver dvb_usb_af9015

removal of stick:

[140985.078071] usb 1-7.2: USB disconnect, address 6
[140985.078344] af9015: bulk message failed:-22 (8/-1)
[140985.078351] af9013: I2C read failed reg:d730
[141120.870029] INFO: task khubd:37 blocked for more than 120 seconds.
[141120.870037] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141120.870044] khubd D 00000000ffffffff 0 37 2 0x00000000
[141120.870056] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141120.870066] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141120.870074] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141120.870083] Call Trace:
[141120.870110] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141120.870124] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141120.870136] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141120.870146] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141120.870155] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141120.870165] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141120.870176] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141120.870186] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141120.870193] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141120.870202] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141120.870210] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141120.870217] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141120.870226] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141120.870235] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141120.870244] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141120.870252] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141120.870261] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141120.870269] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141120.870277] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141120.870284] [<ffffffff81084f66>] kthread+0x96/0xa0
[141120.870292] [<ffffffff810141ea>] child_rip+0xa/0x20
[141120.870300] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141120.870306] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141160.747591] npviewer.bin[13098]: segfault at ff999ea8 ip 00000000ff999ea8 sp 00000000fff5ad6c error 14
[141240.870036] INFO: task khubd:37 blocked for more than 120 seconds.
[141240.870045] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141240.870051] khubd D 00000000ffffffff 0 37 2 0x00000000
[141240.870063] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141240.870073] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141240.870082] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141240.870090] Call Trace:
[141240.870117] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141240.870131] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141240.870143] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141240.870153] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141240.870162] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141240.870172] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141240.870184] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141240.870193] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141240.870200] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141240.870209] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141240.870218] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141240.870224] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141240.870233] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141240.870242] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141240.870251] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141240.870260] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141240.870269] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141240.870276] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141240.870285] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141240.870292] [<ffffffff81084f66>] kthread+0x96/0xa0
[141240.870300] [<ffffffff810141ea>] child_rip+0xa/0x20
[141240.870307] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141240.870314] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141360.873794] INFO: task khubd:37 blocked for more than 120 seconds.
[141360.873803] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141360.873809] khubd D 00000000ffffffff 0 37 2 0x00000000
[141360.873821] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141360.873831] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141360.873840] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141360.873848] Call Trace:
[141360.873875] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141360.873891] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141360.873904] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141360.873914] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141360.873924] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141360.873933] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141360.873944] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141360.873954] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141360.873961] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141360.873970] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141360.873979] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141360.873986] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141360.873995] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141360.874003] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141360.874012] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141360.874021] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141360.874030] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141360.874037] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141360.874046] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141360.874053] [<ffffffff81084f66>] kthread+0x96/0xa0
[141360.874061] [<ffffffff810141ea>] child_rip+0xa/0x20
[141360.874068] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141360.874074] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141480.870037] INFO: task khubd:37 blocked for more than 120 seconds.
[141480.870046] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141480.870052] khubd D 00000000ffffffff 0 37 2 0x00000000
[141480.870064] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141480.870074] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141480.870082] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141480.870091] Call Trace:
[141480.870118] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141480.870133] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141480.870145] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141480.870154] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141480.870164] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141480.870173] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141480.870184] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141480.870194] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141480.870201] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141480.870210] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141480.870218] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141480.870225] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141480.870234] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141480.870243] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141480.870252] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141480.870261] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141480.870269] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141480.870277] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141480.870285] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141480.870292] [<ffffffff81084f66>] kthread+0x96/0xa0
[141480.870302] [<ffffffff810141ea>] child_rip+0xa/0x20
[141480.870309] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141480.870316] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141600.880023] INFO: task khubd:37 blocked for more than 120 seconds.
[141600.880031] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141600.880038] khubd D 00000000ffffffff 0 37 2 0x00000000
[141600.880050] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141600.880060] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141600.880069] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141600.880077] Call Trace:
[141600.880105] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141600.880120] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141600.880132] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141600.880141] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141600.880151] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141600.880160] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141600.880171] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141600.880182] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141600.880188] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141600.880197] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141600.880206] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141600.880213] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141600.880222] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141600.880231] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141600.880240] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141600.880248] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141600.880257] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141600.880265] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141600.880274] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141600.880281] [<ffffffff81084f66>] kthread+0x96/0xa0
[141600.880289] [<ffffffff810141ea>] child_rip+0xa/0x20
[141600.880296] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141600.880303] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141720.871366] INFO: task khubd:37 blocked for more than 120 seconds.
[141720.871374] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141720.871381] khubd D 00000000ffffffff 0 37 2 0x00000000
[141720.871392] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141720.871402] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141720.871411] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141720.871419] Call Trace:
[141720.871446] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141720.871460] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141720.871472] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141720.871481] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141720.871491] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141720.871501] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141720.871513] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141720.871523] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141720.871529] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141720.871538] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141720.871547] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141720.871553] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141720.871562] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141720.871571] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141720.871580] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141720.871589] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141720.871598] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141720.871606] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141720.871614] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141720.871621] [<ffffffff81084f66>] kthread+0x96/0xa0
[141720.871629] [<ffffffff810141ea>] child_rip+0xa/0x20
[141720.871636] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141720.871642] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141752.605210] npviewer.bin[13509]: segfault at ff999ea8 ip 00000000ff999ea8 sp 00000000ffe8b7fc error 14
[141840.870022] INFO: task khubd:37 blocked for more than 120 seconds.
[141840.870027] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141840.870030] khubd D 00000000ffffffff 0 37 2 0x00000000
[141840.870037] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141840.870043] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141840.870047] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141840.870051] Call Trace:
[141840.870068] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141840.870077] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141840.870083] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141840.870088] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141840.870093] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141840.870098] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141840.870105] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141840.870110] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141840.870113] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141840.870118] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141840.870123] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141840.870126] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141840.870131] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141840.870135] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141840.870140] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141840.870145] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141840.870149] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141840.870153] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141840.870157] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141840.870161] [<ffffffff81084f66>] kthread+0x96/0xa0
[141840.870165] [<ffffffff810141ea>] child_rip+0xa/0x20
[141840.870169] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141840.870172] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[141960.870045] INFO: task khubd:37 blocked for more than 120 seconds.
[141960.870053] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[141960.870060] khubd D 00000000ffffffff 0 37 2 0x00000000
[141960.870078] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[141960.870090] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[141960.870098] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[141960.870107] Call Trace:
[141960.870133] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[141960.870147] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141960.870161] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[141960.870171] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[141960.870180] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[141960.870190] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[141960.870201] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[141960.870211] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[141960.870218] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[141960.870227] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[141960.870235] [<ffffffff813658f7>] device_del+0x127/0x1d0
[141960.870242] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[141960.870251] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[141960.870259] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[141960.870269] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[141960.870277] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[141960.870286] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[141960.870294] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[141960.870302] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[141960.870309] [<ffffffff81084f66>] kthread+0x96/0xa0
[141960.870317] [<ffffffff810141ea>] child_rip+0xa/0x20
[141960.870324] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[141960.870330] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[142080.870043] INFO: task khubd:37 blocked for more than 120 seconds.
[142080.870051] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[142080.870058] khubd D 00000000ffffffff 0 37 2 0x00000000
[142080.870070] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[142080.870080] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[142080.870089] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[142080.870098] Call Trace:
[142080.870125] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[142080.870139] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[142080.870151] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[142080.870161] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[142080.870170] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[142080.870180] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[142080.870191] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[142080.870201] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[142080.870207] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[142080.870216] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[142080.870225] [<ffffffff813658f7>] device_del+0x127/0x1d0
[142080.870232] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[142080.870240] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[142080.870249] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[142080.870258] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[142080.870268] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[142080.870276] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[142080.870284] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[142080.870292] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[142080.870299] [<ffffffff81084f66>] kthread+0x96/0xa0
[142080.870307] [<ffffffff810141ea>] child_rip+0xa/0x20
[142080.870315] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[142080.870321] [<ffffffff810141e0>] ? child_rip+0x0/0x20
[142200.870031] INFO: task khubd:37 blocked for more than 120 seconds.
[142200.870040] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[142200.870046] khubd D 00000000ffffffff 0 37 2 0x00000000
[142200.870058] ffff880235c09ab0 0000000000000046 0000000000015b80 0000000000015b80
[142200.870068] ffff880235c04890 ffff880235c09fd8 0000000000015b80 ffff880235c044d0
[142200.870077] 0000000000015b80 ffff880235c09fd8 0000000000015b80 ffff880235c04890
[142200.870086] Call Trace:
[142200.870112] [<ffffffffa04dcd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[142200.870126] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[142200.870139] [<ffffffffa04fa0e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[142200.870149] [<ffffffffa04f94b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[142200.870159] [<ffffffffa04f9579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[142200.870168] [<ffffffffa0500051>] af9015_usb_device_exit+0x41/0x60 [dvb_usb_af9015]
[142200.870180] [<ffffffff813d8d74>] usb_unbind_interface+0x124/0x170
[142200.870189] [<ffffffff8136860f>] __device_release_driver+0x6f/0xe0
[142200.870196] [<ffffffff8136877d>] device_release_driver+0x2d/0x40
[142200.870205] [<ffffffff8136779a>] bus_remove_device+0x9a/0xc0
[142200.870213] [<ffffffff813658f7>] device_del+0x127/0x1d0
[142200.870220] [<ffffffff813d5538>] usb_disable_device+0xa8/0x130
[142200.870228] [<ffffffff813cf2d2>] usb_disconnect+0xd2/0x170
[142200.870237] [<ffffffff813cf94f>] hub_port_connect_change+0x8f/0x980
[142200.870246] [<ffffffff813d0c42>] hub_events+0x3b2/0x5a0
[142200.870255] [<ffffffff8153e238>] ? thread_return+0x48/0x420
[142200.870263] [<ffffffff813d0e85>] hub_thread+0x55/0x190
[142200.870271] [<ffffffff810852e0>] ? autoremove_wake_function+0x0/0x40
[142200.870280] [<ffffffff813d0e30>] ? hub_thread+0x0/0x190
[142200.870287] [<ffffffff81084f66>] kthread+0x96/0xa0
[142200.870295] [<ffffffff810141ea>] child_rip+0xa/0x20
[142200.870302] [<ffffffff81084ed0>] ? kthread+0x0/0xa0
[142200.870316] [<ffffffff810141e0>] ? child_rip+0x0/0x20

Modules did not remove:
Module Size Used by
mxl5005s 38780 2
af9013 21954 2
dvb_usb_af9015 30239 2
dvb_usb 16709 1 dvb_usb_af9015
dvb_core 102929 1 dvb_usb
usbhid 40988 0
snd_usb_audio 92747 0
hid 83280 1 usbhid
snd_usb_lib 18978 1 snd_usb_audio
nls_utf8 1421 1
isofs 33399 1
snd_hda_codec_atihdmi 3023 1
snd_hda_codec_analog 78702 1
binfmt_misc 7960 1
vboxnetadp 5235 0
vboxnetflt 12242 0
vboxdrv 1768247 2 vboxnetadp,vboxnetflt
fbcon 39270 71
tileblit 2487 1 fbcon
font 8053 1 fbcon
bitblit 5811 1 fbcon
softcursor 1565 1 bitblit
vga16fb 12757 0
vgastate 9857 1 vga16fb
snd_hda_intel 25517 4
snd_hda_codec 85727 3 snd_hda_codec_atihdmi,snd_hda_codec_analog,snd_hda_intel
snd_hwdep 6924 2 snd_usb_audio,snd_hda_codec
snd_pcm_oss 41394 0
snd_mixer_oss 16299 1 snd_pcm_oss
snd_pcm 87850 5 snd_usb_audio,snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_dummy 1782 0
snd_seq_oss 31219 0
snd_seq_midi 5829 0
snd_rawmidi 23388 2 snd_usb_lib,snd_seq_midi
snd_seq_midi_event 7267 2 snd_seq_oss,snd_seq_midi
snd_seq 57417 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 23553 2 snd_pcm,snd_seq
ppdev 6375 0
snd_seq_device 6824 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
radeon 738855 3
snd 70978 20 snd_usb_audio,snd_hda_codec_analog,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
psmouse 64288 0
parport_pc 30118 1
ttm 60815 1 radeon
drm_kms_helper 30710 1 radeon
edac_core 45423 0
soundcore 8052 1 snd
edac_mce_amd 9182 0
serio_raw 4918 0
snd_page_alloc 8660 2 snd_hda_intel,snd_pcm
drm 198962 5 radeon,ttm,drm_kms_helper
i2c_algo_bit 6024 1 radeon
asus_atk0110 10033 0
i2c_nforce2 6099 0
lp 9336 0
parport 37160 3 ppdev,parport_pc,lp
ohci1394 30548 0
usb_storage 49833 0
ahci 37550 0
pata_jmicron 2747 0
ieee1394 94798 1 ohci1394
sata_nv 23778 4
forcedeth 55988 0
pata_amd 11962 1

[Jeremy Foshee (jeremyfoshee)]

Hi toad,

Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/releases/ . If the issue remains, please run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 558532

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[jonfer (fernandez-jon)]

It happens the same to me.

I have a ASUS M4A785TD-V EVO Motherboard with a SB710 chipset and Lucyd Lynx (Linux nexus 2.6.32-22-generic #33-Ubuntu SMP Wed Apr 28 13:28:05 UTC 2010 x86_64 GNU/Linux).

It happens when I try to open me-tv to watch dvb. The program freezes and yells some error I can't remember right now, I'm not in front of my box, but it's related to some kind of read timeout. I unplug my dvb-t stickit but it does not unload related modules, and if I try to plug another usb device, it does not work. Even the tiny green light of my usb drive does not flash, as if it could get power from the USB port.
These are the modules loaded:

dvb_usb_dib0700 71047 0
dib7000p 18348 2 dvb_usb_dib0700
dib7000m 15907 1 dvb_usb_dib0700
dib0070 8549 2 dvb_usb_dib0700
dvb_usb 16709 1 dvb_usb_dib0700
dib3000mc 12997 1 dvb_usb_dib0700
dib8000 26879 1 dvb_usb_dib0700
dibx000_common 3570 4 dib7000p,dib7000m,dib3000mc,dib8000
dvb_core 102929 3 dib7000p,dvb_usb,dib8000

This is the dmesg output:

[ 177.413252] ehci_hcd 0000:00:12.2: force halt; handhake ffffc90000650824 00004000 00000000 -> -110
[ 177.413301] ehci_hcd 0000:00:12.2: HC died; cleaning up
[ 177.413334] usb 1-1: USB disconnect, address 2
[ 192.261966] dvb-usb: error while stopping stream.
[ 206.778845] dvb-usb: could not submit URB no. 0 - get them all back
[ 206.778857] dvb-usb: error while enabling fifo.
[ 360.970053] INFO: task khubd:44 blocked for more than 120 seconds.
[ 360.970060] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 360.970066] khubd D 0000000000000000 0 44 2 0x00000000
[ 360.970077] ffff880119d07b40 0000000000000046 0000000000015bc0 0000000000015bc0
[ 360.970087] ffff880119d09ab0 ffff880119d07fd8 0000000000015bc0 ffff880119d096f0
[ 360.970096] 0000000000015bc0 ffff880119d07fd8 0000000000015bc0 ffff880119d09ab0
[ 360.970104] Call Trace:
[ 360.970131] [<ffffffffa043dd45>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[ 360.970144] [<ffffffff81085320>] ? autoremove_wake_function+0x0/0x40
[ 360.970156] [<ffffffffa03860e2>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[ 360.970166] [<ffffffffa03854b3>] dvb_usb_exit+0x53/0xd0 [dvb_usb]
[ 360.970176] [<ffffffffa0385579>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[ 360.970187] [<ffffffff813d92d4>] usb_unbind_interface+0x124/0x170
[ 360.970196] [<ffffffff81368c8f>] __device_release_driver+0x6f/0xe0
[ 360.970203] [<ffffffff81368dfd>] device_release_driver+0x2d/0x40
[ 360.970212] [<ffffffff81367e1a>] bus_remove_device+0x9a/0xc0
[ 360.970220] [<ffffffff81365f77>] device_del+0x127/0x1d0
[ 360.970227] [<ffffffff813d5a98>] usb_disable_device+0xa8/0x130
[ 360.970236] [<ffffffff813cf832>] usb_disconnect+0xd2/0x170
[ 360.970244] [<ffffffff813cf931>] hub_quiesce+0x61/0xc0
[ 360.970252] [<ffffffff813d0e21>] hub_events+0x31/0x5a0
[ 360.970260] [<ffffffff8153e768>] ? thread_return+0x48/0x420
[ 360.970270] [<ffffffff810397a9>] ? default_spin_lock_flags+0x9/0x10
[ 360.970278] [<ffffffff813d13e5>] hub_thread+0x55/0x190
[ ...

[Jeremy Foshee (jeremyfoshee)]

This bug report was marked as Incomplete and has not had any updated comments for quite some time. As a result this bug is being closed. Please reopen if this is still an issue in the current Ubuntu release http://www.ubuntu.com/getubuntu/download . Also, please be sure to provide any requested information that may have been missing. To reopen the bug, click on the current status under the Status column and change the status back to "New". Thanks.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

[Kim Tyler (ktyler)]

It has been happening to me regularly on AMD64 dual core, causing USB devices to stop.
uname -a
Linux mike 2.6.32-28-generic #55-Ubuntu SMP Mon Jan 10 23:42:43 UTC 2011 x86_64 GNU/Linux

USB devices will only work if rebooted. The USB disconnect message was NOT caused by physical intervention - it just happens.

[ 401.047139] usb 1-8: USB disconnect, address 5
[ 600.422545] INFO: task khubd:30 blocked for more than 120 seconds.
[ 600.422554] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 600.422560] khubd D 0000000000000000 0 30 2 0x00000000
[ 600.422571] ffff88007ca95ad0 0000000000000046 0000000000015bc0 0000000000015bc0
[ 600.422580] ffff88007ca71aa8 ffff88007ca95fd8 0000000000015bc0 ffff88007ca716f0
[ 600.422588] 0000000000015bc0 ffff88007ca95fd8 0000000000015bc0 ffff88007ca71aa8
[ 600.422596] Call Trace:
[ 600.422630] [<ffffffffa0d0a7b5>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[ 600.422644] [<ffffffff81084720>] ? autoremove_wake_function+0x0/0x40
[ 600.422656] [<ffffffffa0103332>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[ 600.422666] [<ffffffffa0102523>] dvb_usb_exit+0x63/0x110 [dvb_usb]
[ 600.422675] [<ffffffffa0102619>] dvb_usb_device_exit+0x49/0x60 [dvb_usb]
[ 600.422686] [<ffffffff813dc164>] usb_unbind_interface+0x124/0x170
[ 600.422696] [<ffffffff8136b7ff>] __device_release_driver+0x6f/0xe0
[ 600.422702] [<ffffffff8136b96d>] device_release_driver+0x2d/0x40
[ 600.422709] [<ffffffff8136a98a>] bus_remove_device+0x9a/0xc0
[ 600.422718] [<ffffffff81368ae7>] device_del+0x127/0x1d0
[ 600.422724] [<ffffffff813d88e0>] usb_disable_device+0x70/0x130
[ 600.422734] [<ffffffff813d26b2>] usb_disconnect+0xd2/0x170
[ 600.422740] [<ffffffff813d2d22>] hub_port_connect_change+0x92/0x9d0
[ 600.422746] [<ffffffff813d4062>] hub_events+0x3b2/0x5a0
[ 600.422755] [<ffffffff81542903>] ? thread_return+0x223/0x420
[ 600.422762] [<ffffffff813d42a5>] hub_thread+0x55/0x190
[ 600.422768] [<ffffffff81084720>] ? autoremove_wake_function+0x0/0x40
[ 600.422774] [<ffffffff813d4250>] ? hub_thread+0x0/0x190
[ 600.422780] [<ffffffff810843a6>] kthread+0x96/0xa0
[ 600.422788] [<ffffffff810131ea>] child_rip+0xa/0x20
[ 600.422794] [<ffffffff81084310>] ? kthread+0x0/0xa0
[ 600.422800] [<ffffffff810131e0>] ? child_rip+0x0/0x20
[ 720.422543] INFO: task khubd:30 blocked for more than 120 seconds.
[ 720.422551] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 720.422557] khubd D 0000000000000000 0 30 2 0x00000000
[ 720.422567] ffff88007ca95ad0 0000000000000046 0000000000015bc0 0000000000015bc0
[ 720.422576] ffff88007ca71aa8 ffff88007ca95fd8 0000000000015bc0 ffff88007ca716f0
[ 720.422584] 0000000000015bc0 ffff88007ca95fd8 0000000000015bc0 ffff88007ca71aa8
[ 720.422592] Call Trace:
[ 720.422627] [<ffffffffa0d0a7b5>] dvb_unregister_frontend+0xc5/0x110 [dvb_core]
[ 720.422641] [<ffffffff81084720>] ? autoremove_wake_function+0x0/0x40
[ 720.422654] [<ffffffffa0103332>] dvb_usb_adapter_frontend_exit+0x22/0x40 [dvb_usb]
[ 720.422663] [<ffffffffa0102523>] dvb_usb_exit+0x63/0x110 [dvb_usb]
[ 720.422673] [<f...

[Felix (apoapo)]

Quite often when i disconnect my dvb-t stick all my usb devices stop working. Here is the dmesg output:

[467616.983504] usb 1-3: USB disconnect, device number 3
[467616.986622] af9015: bulk message failed:-19 (8/0)
[467616.986630] af9013: I2C read failed reg:d417
[467616.986636] af9015: bulk message failed:-19 (8/0)
[467616.986640] af9013: I2C read failed reg:d417
[467616.986646] af9015: bulk message failed:-19 (9/0)
[467616.986651] mxl5007t_write_reg: 469: failed!
[467616.986656] mxl5007t_sleep: error -121 on line 715
[467616.986661] af9015: bulk message failed:-19 (9/0)
[467616.986665] mxl5007t_write_reg: 469: failed!
[467616.986670] mxl5007t_sleep: error -121 on line 717
[467616.986675] af9015: bulk message failed:-19 (8/0)
[467616.986680] af9013: I2C read failed reg:d417
[467616.986685] af9015: bulk message failed:-19 (8/0)
[467616.986689] af9013: I2C read failed reg:d417
[467616.986695] af9015: bulk message failed:-19 (8/0)
[467616.986699] af9013: I2C read failed reg:d730
[467760.640056] INFO: task khubd:31 blocked for more than 120 seconds.
[467760.640066] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[467760.640075] khubd D cac05b7e 0 31 2 0x00000000
[467760.640087] f52bddcc 00000046 f397b2c0 cac05b7e f52bdd64 c1807020 c192ce00 c192ce00
[467760.640109] f6ca3110 0001a94b f7bc0e00 f5136580 c1807020 00000000 00000001 f5136580
[467760.640131] c1053b90 00100100 00200200 f397b2c0 f3213fc8 f51dc968 f52bdda8 c1036628
[467760.640153] Call Trace:
[467760.640168] [<c1053b90>] ? try_to_wake_up+0x190/0x190
[467760.640178] [<c1036628>] ? default_spin_lock_flags+0x8/0x10
[467760.640186] [<c15a55ed>] ? _raw_spin_lock_irqsave+0x2d/0x40
[467760.640194] [<c15a39e5>] schedule+0x35/0x50
[467760.640216] [<f9d69835>] dvb_unregister_frontend+0xa5/0xf0 [dvb_core]
[467760.640228] [<f9214136>] ? rc_free_device+0x36/0x40 [rc_core]
[467760.640236] [<c10799a0>] ? add_wait_queue+0x50/0x50
[467760.640247] [<f9225849>] dvb_usb_adapter_frontend_exit+0x39/0x70 [dvb_usb]
[467760.640257] [<f922458b>] dvb_usb_exit+0x3b/0xb0 [dvb_usb]
[467760.640267] [<f9224642>] dvb_usb_device_exit+0x42/0x60 [dvb_usb]
[467760.640276] [<c14152ec>] usb_unbind_interface+0x3c/0x140
[467760.640286] [<c138433b>] __device_release_driver+0x5b/0xb0
[467760.640293] [<c13843b4>] device_release_driver+0x24/0x40
[467760.640301] [<c1383f2a>] bus_remove_device+0x5a/0x80
[467760.640308] [<c1381c47>] device_del+0xe7/0x150
[467760.640315] [<c1413349>] usb_disable_device+0x89/0x1b0
[467760.640323] [<c140cf0e>] usb_disconnect+0x7e/0x100
[467760.640331] [<c140dbfa>] hub_port_connect_change+0x8a/0x640
[467760.640338] [<c14129bb>] ? usb_control_msg+0xdb/0x100
[467760.640346] [<c140a040>] ? clear_port_feature+0x50/0x60
[467760.640354] [<c140e5ed>] hub_events+0x43d/0x570
[467760.640362] [<c1079a9d>] ? finish_wait+0x4d/0x70
[467760.640369] [<c140e720>] ? hub_events+0x570/0x570
[467760.640376] [<c140e745>] hub_thread+0x25/0x140
[467760.640383] [<c10799a0>] ? add_wait_queue+0x50/0x50
[467760.640391] [<c107919d>] kthread+0x6d/0x80
[467760.640398] [<c1079130>] ? flush_kthread_worker+0x80/0x80
[467760.640406] [<c15acd7e>] kernel_thread_hel...

[Janus (ysangkok+launchpad)]

[30551.206239] usb 2-5: dvb_usb_v2: usb_bulk_msg() failed=-19
[30551.206246] i2c i2c-6: af9013: i2c rd failed=-19 reg=d417 len=1
[30720.972038] INFO: task khubd:20 blocked for more than 120 seconds.
[30720.972046] Tainted: PF O 3.13.0-27-generic #50-Ubuntu
[30720.972048] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[30720.972050] khubd D d2e1c0b0 0 20 2 0x00000000
[30720.972057] f71c5b5c 00000046 f71c5af4 d2e1c0b0 00000246 c1a8b540 43195a3f 00001bc9
[30720.972063] c1a8b540 d2e98cf0 f71519e0 f7bd8540 00000001 f71519e0 c1082b00 00100100
[30720.972068] 00200200 e7d07f90 e4778228 d2e1c0b0 f71c5b40 c107513d e7c8ac00 00000246
[30720.972074] Call Trace:
[30720.972088] [<c1082b00>] ? wake_up_state+0x20/0x20
[30720.972093] [<c107513d>] ? kthread_stop+0x3d/0xc0
[30720.972098] [<c10911bb>] ? prepare_to_wait_event+0x6b/0xd0
[30720.972103] [<c16529b3>] schedule+0x23/0x60
[30720.972132] [<f903b04d>] dvb_unregister_frontend+0x9d/0x100 [dvb_core]
[30720.972141] [<f8f24b06>] ? rc_free_device+0x36/0x40 [rc_core]
[30720.972145] [<c1091220>] ? prepare_to_wait_event+0xd0/0xd0
[30720.972152] [<f901a3ad>] dvb_usbv2_exit+0xad/0x310 [dvb_usb_v2]
[30720.972156] [<c10862ed>] ? __enqueue_entity+0x6d/0x80
[30720.972162] [<f901a67f>] dvb_usbv2_disconnect+0x6f/0xf0 [dvb_usb_v2]
[30720.972168] [<c12f77a3>] ? format_decode+0x323/0x390
[30720.972175] [<c1415460>] ? __pm_runtime_suspend+0x70/0x70
[30720.972179] [<c14154c0>] ? pm_suspend_timer_fn+0x60/0x60
[30720.972187] [<c14abb4a>] usb_unbind_interface+0x4a/0x190
[30720.972191] [<c1409d81>] __device_release_driver+0x61/0xc0
[30720.972195] [<c1409dfd>] device_release_driver+0x1d/0x30
[30720.972198] [<c1409773>] bus_remove_device+0xc3/0x130
[30720.972202] [<c14060b4>] ? device_remove_attrs+0x54/0x70
[30720.972206] [<c1406aec>] device_del+0xec/0x170
[30720.972210] [<c14a9746>] usb_disable_device+0x86/0x240
[30720.972213] [<c1406efd>] ? _dev_info+0x2d/0x30
[30720.972217] [<c149ec3d>] usb_disconnect+0x9d/0x1d0
[30720.972220] [<c14a186a>] hub_port_connect_change+0xca/0xaa0
[30720.972224] [<c14a8376>] ? usb_control_msg+0xb6/0xd0
[30720.972227] [<c14a2678>] hub_events+0x438/0xa60
[30720.972231] [<c1652578>] ? __schedule+0x358/0x770
[30720.972234] [<c1091044>] ? finish_wait+0x44/0x60
[30720.972238] [<c14a2cc5>] hub_thread+0x25/0x140
[30720.972241] [<c1091220>] ? prepare_to_wait_event+0xd0/0xd0
[30720.972244] [<c14a2ca0>] ? hub_events+0xa60/0xa60
[30720.972247] [<c1074f21>] kthread+0xa1/0xc0
[30720.972252] [<c165d037>] ret_from_kernel_thread+0x1b/0x28
[30720.972256] [<c1074e80>] ? kthread_create_on_node+0x150/0x150
[30720.972329] INFO: task vlc:19266 blocked for more than 120 seconds.
[30720.972332] Tainted: PF O 3.13.0-27-generic #50-Ubuntu
[30720.972334] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[30720.972335] vlc D c108ac82 0 19266 15309 0x00000000
[30720.972339] e478dcb0 00000082 e478dc90 c108ac82 f7bd85b0 c1a8b540 e9fa1d45 00001bc8
[30720.972345] c1a8b540 f62540b0 f62526d0 f7bd8540 d2e1c0b0 f62526d0 e478dc88 c100ecb0
[30720.972349] 00000000 f62529f4 f7bd5e00 f9ec6d...