Hello, We are currently evaluating a new thinclient setup where we use usbip vhci-hcd hostdriver to enable the support for usb devices over the network. We are testing several fpga programmers. One is an usb->serial adapter which uses the ftdi_sio driver. After disconnecting the dongle on the thinclient, the kernel on the vhci_hcd host got stuck. I really can't say if this is related to the vhci_hcd host driver but for me it doesn't look like it. I think this problem is eventually related to usbserial or usbcore. Here is a kernel snip from connecting to disconnect: [1295781.598738] vhci_hcd: changed 0 [1295782.368860] vhci_hcd vhci_hcd: rhport(0) sockfd(3) devid(327691) speed(3) [1295782.369126] vhci_hcd: changed 1 [1295782.475482] vhci_hcd: changed 0 [1295782.583659] usb 3-1: new high-speed USB device number 38 using vhci_hcd [1295782.807841] usb 3-1: new high-speed USB device number 39 using vhci_hcd [1295783.031955] usb 3-1: new high-speed USB device number 40 using vhci_hcd [1295783.032008] usb 3-1: SetAddress Request (40) to port 0 [1295783.055278] usb 3-1: New USB device found, idVendor=0403, idProduct=6014 [1295783.055329] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [1295783.055398] usb 3-1: Product: Digilent USB Device [1295783.055439] usb 3-1: Manufacturer: Digilent [1295783.055478] usb 3-1: SerialNumber: 210248471470 [1295783.058652] ftdi_sio 3-1:1.0: FTDI USB Serial Device converter detected [1295783.058770] usb 3-1: Detected FT232H [1295783.058809] usb 3-1: Number of endpoints 2 [1295783.058848] usb 3-1: Endpoint 1 MaxPacketSize 512 [1295783.058889] usb 3-1: Endpoint 2 MaxPacketSize 512 [1295783.058929] usb 3-1: Setting MaxPacketSize 512 [1295783.059746] usb 3-1: FTDI USB Serial Device converter now attached to ttyUSB0 [1295810.281891] usb 3-1: seqnum max [1295855.427428] vhci_hcd: dequeue a urb ffff880f09d9fc80 [1295855.427485] vhci_hcd: device ffff880efb664268 seems to be still connected [1295855.501236] vhci_hcd: unlink->seqnum 117833 [1295855.501286] vhci_hcd: urb->status -104 [1295855.501405] vhci_hcd: dequeue a urb ffff880ef1dd2c00 [1295855.501461] vhci_hcd: device ffff880efb664268 seems to be still connected [1295855.575760] vhci_hcd: unlink->seqnum 117908 [1295855.575806] vhci_hcd: urb->status -104 [1295855.575907] vhci_hcd: dequeue a urb ffff880ef2c04c00 [1295937.360069] vhci_hcd: connection closed [1295937.360227] vhci_hcd: stop threads [1295937.360299] vhci_hcd: release socket [1295937.360339] vhci_hcd: changed 1 [1295937.360381] vhci_hcd: disconnect device [1295937.360599] usb 3-1: USB disconnect, device number 40 [1295937.360744] vhci_hcd: dequeue a urb ffff880ef1f64ec0 [1295937.360786] vhci_hcd: device ffff880efb664268 seems to be disconnected [1295937.360831] vhci_hcd: gives back urb ffff880ef1f64ec0 [1296024.627193] INFO: task modem-manager:6025 blocked for more than 120 seconds. [1296024.627270] Tainted: G C 3.14-1-amd64 #1 [1296024.627311] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1296024.627381] modem-manager D ffff88303edc6768 0 6025 1 0x20020000 [1296024.627462] ffff88303edc6350 0000000000000086 0000000000014380 0000000000014380 [1296024.627558] ffff88303eed7fd8 ffff88303edc6350 ffff880ef2c04c00 ffff88103d849180 [1296024.627647] ffff880a59c81000 0000000000000000 ffff883078925920 ffff880f82171860 [1296024.627738] Call Trace: [1296024.627850] [<ffffffffa0015be5>] ? usb_kill_urb+0x55/0x90 [usbcore] [1296024.627905] [<ffffffff8109e400>] ? prepare_to_wait_event+0xf0/0xf0 [1296024.627960] [<ffffffffa05fb7e3>] ? usb_serial_generic_close+0x63/0x80 [usbserial] [1296024.628036] [<ffffffff81332ca5>] ? tty_port_shutdown+0x65/0xa0 [1296024.628083] [<ffffffff813335b3>] ? tty_port_close+0x23/0x50 [1296024.628130] [<ffffffff8132a855>] ? tty_release+0xf5/0x5b0 [1296024.628179] [<ffffffff813bd62a>] ? SYSC_sendto+0xda/0x140 [1296024.628228] [<ffffffff811873f5>] ? __fput+0xc5/0x210 [1296024.628279] [<ffffffff8107cda7>] ? task_work_run+0x97/0xd0 [1296024.628330] [<ffffffff81013979>] ? do_notify_resume+0x59/0x90 [1296024.628378] [<ffffffff814c7732>] ? int_signal+0x12/0x17 [1296144.718142] INFO: task khubd:734 blocked for more than 120 seconds. [1296144.718196] Tainted: G C 3.14-1-amd64 #1 [1296144.718238] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1296144.718308] khubd D ffff88403e53d078 0 734 2 0x00000000 [1296144.718388] ffff88403e53cc60 0000000000000046 0000000000014380 0000000000014380 [1296144.718482] ffff88403e545fd8 ffff88403e53cc60 ffff880a59c81088 ffff88403e545c10 [1296144.718572] ffff880a59c8108c ffff88403e53cc60 00000000ffffffff ffff880a59c81090 [1296144.718662] Call Trace: [1296144.718714] [<ffffffff814bc740>] ? schedule_preempt_disabled+0x20/0x70 [1296144.718764] [<ffffffff814be1b3>] ? __mutex_lock_slowpath+0x133/0x1b0 [1296144.718812] [<ffffffff814be246>] ? mutex_lock+0x16/0x25 [1296144.718859] [<ffffffff81329259>] ? __tty_hangup+0x59/0x440 [1296144.718911] [<ffffffffa05f9ebf>] ? usb_serial_disconnect+0x7f/0x130 [usbserial] [1296144.719045] [<ffffffffa001995b>] ? usb_unbind_interface+0x5b/0x1c0 [usbcore] [1296144.719121] [<ffffffff81365b05>] ? __device_release_driver+0x75/0xf0 [1296144.719168] [<ffffffff81365b99>] ? device_release_driver+0x19/0x30 [1296144.719214] [<ffffffff813654f2>] ? bus_remove_device+0xf2/0x140 [1296144.719265] [<ffffffff8136260e>] ? device_del+0x10e/0x1b0 [1296144.719319] [<ffffffffa00176d4>] ? usb_disable_device+0x94/0x1f0 [usbcore] [1296144.719375] [<ffffffffa000de7e>] ? usb_disconnect+0x8e/0x190 [usbcore] [1296144.719431] [<ffffffffa001098e>] ? hub_thread+0x53e/0x1320 [usbcore] [1296144.719483] [<ffffffff8109e400>] ? prepare_to_wait_event+0xf0/0xf0 [1296144.719537] [<ffffffffa0010450>] ? usb_reset_device+0x170/0x170 [usbcore] [1296144.719589] [<ffffffff8107f911>] ? kthread+0xc1/0xe0 [1296144.719633] [<ffffffff8107f850>] ? kthread_create_on_node+0x180/0x180 [1296144.719681] [<ffffffff814c73cc>] ? ret_from_fork+0x7c/0xb0 [1296144.719726] [<ffffffff8107f850>] ? kthread_create_on_node+0x180/0x180 [1296144.719851] INFO: task modem-manager:6025 blocked for more than 120 seconds. [1296144.719919] Tainted: G C 3.14-1-amd64 #1 [1296144.719959] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1296144.720028] modem-manager D ffff88303edc6768 0 6025 1 0x20020000 [1296144.720105] ffff88303edc6350 0000000000000086 0000000000014380 0000000000014380 [1296144.720195] ffff88303eed7fd8 ffff88303edc6350 ffff880ef2c04c00 ffff88103d849180 [1296144.720285] ffff880a59c81000 0000000000000000 ffff883078925920 ffff880f82171860 [1296144.720374] Call Trace: [1296144.720426] [<ffffffffa0015be5>] ? usb_kill_urb+0x55/0x90 [usbcore] [1296144.720475] [<ffffffff8109e400>] ? prepare_to_wait_event+0xf0/0xf0 [1296144.720528] [<ffffffffa05fb7e3>] ? usb_serial_generic_close+0x63/0x80 [usbserial] [1296144.720601] [<ffffffff81332ca5>] ? tty_port_shutdown+0x65/0xa0 [1296144.720648] [<ffffffff813335b3>] ? tty_port_close+0x23/0x50 [1296144.720694] [<ffffffff8132a855>] ? tty_release+0xf5/0x5b0 [1296144.720742] [<ffffffff813bd62a>] ? SYSC_sendto+0xda/0x140 [1296144.720789] [<ffffffff811873f5>] ? __fput+0xc5/0x210 [1296144.720836] [<ffffffff8107cda7>] ? task_work_run+0x97/0xd0 [1296144.720885] [<ffffffff81013979>] ? do_notify_resume+0x59/0x90 [1296144.720931] [<ffffffff814c7732>] ? int_signal+0x12/0x17 [1296144.721371] INFO: task adb:22930 blocked for more than 120 seconds. [1296144.721416] Tainted: G C 3.14-1-amd64 #1 [1296144.721456] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1296144.721525] adb D ffff88403dc9c668 0 22930 1 0x20020000 [1296144.721602] ffff88403dc9c250 0000000000200086 0000000000014380 0000000000014380 [1296144.721691] ffff88403d37ffd8 ffff88403dc9c250 ffff880ef24318e8 ffff88403d37fc38 [1296144.721781] ffff880ef24318ec ffff88403dc9c250 00000000ffffffff ffff880ef24318f0 [1296144.721870] Call Trace: [1296144.721909] [<ffffffff814bc740>] ? schedule_preempt_disabled+0x20/0x70 [1296144.721958] [<ffffffff814be1b3>] ? __mutex_lock_slowpath+0x133/0x1b0 [1296144.722022] [<ffffffff814be246>] ? mutex_lock+0x16/0x25 [1296144.722091] [<ffffffffa001dccc>] ? usbdev_open+0xbc/0x210 [usbcore] [1296144.722148] [<ffffffff81189ded>] ? chrdev_open+0x9d/0x180 [1296144.722194] [<ffffffff81189d50>] ? cdev_put+0x30/0x30 [1296144.722239] [<ffffffff811835aa>] ? do_dentry_open+0x1ba/0x2c0 [1296144.722284] [<ffffffff81183878>] ? finish_open+0x28/0x40 [1296144.722331] [<ffffffff811940cc>] ? do_last+0xa5c/0x11c0 [1296144.722376] [<ffffffff81190839>] ? link_path_walk+0x69/0x840 [1296144.722425] [<ffffffff811948e6>] ? path_openat+0xb6/0x670 [1296144.722471] [<ffffffff8101287e>] ? __switch_to+0x41e/0x4b0 [1296144.722518] [<ffffffff814bbe96>] ? __schedule+0x2a6/0x6e0 [1296144.722564] [<ffffffff81195655>] ? do_filp_open+0x35/0x80 [1296144.722614] [<ffffffff8119e729>] ? touch_atime+0x69/0x140 [1296144.722660] [<ffffffff811a0ebc>] ? __alloc_fd+0x7c/0x120 [1296144.722706] [<ffffffff81184ec4>] ? do_sys_open+0x124/0x210 [1296144.722754] [<ffffffff814c8fec>] ? sysenter_dispatch+0x7/0x21 [1296264.813162] INFO: task khubd:734 blocked for more than 120 seconds. [1296264.813215] Tainted: G C 3.14-1-amd64 #1 [1296264.813257] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [1296264.813327] khubd D ffff88403e53d078 0 734 2 0x00000000 [1296264.813407] ffff88403e53cc60 0000000000000046 0000000000014380 0000000000014380 [1296264.813503] ffff88403e545fd8 ffff88403e53cc60 ffff880a59c81088 ffff88403e545c10 [1296264.813593] ffff880a59c8108c ffff88403e53cc60 00000000ffffffff ffff880a59c81090 [1296264.813683] Call Trace: [1296264.813732] [<ffffffff814bc740>] ? schedule_preempt_disabled+0x20/0x70 [1296264.813782] [<ffffffff814be1b3>] ? __mutex_lock_slowpath+0x133/0x1b0 [1296264.813830] [<ffffffff814be246>] ? mutex_lock+0x16/0x25 [1296264.813877] [<ffffffff81329259>] ? __tty_hangup+0x59/0x440 [1296264.813928] [<ffffffffa05f9ebf>] ? usb_serial_disconnect+0x7f/0x130 [usbserial] [1296264.814064] [<ffffffffa001995b>] ? usb_unbind_interface+0x5b/0x1c0 [usbcore] [1296264.814139] [<ffffffff81365b05>] ? __device_release_driver+0x75/0xf0 [1296264.814185] [<ffffffff81365b99>] ? device_release_driver+0x19/0x30 [1296264.814232] [<ffffffff813654f2>] ? bus_remove_device+0xf2/0x140 [1296264.814281] [<ffffffff8136260e>] ? device_del+0x10e/0x1b0 [1296264.814335] [<ffffffffa00176d4>] ? usb_disable_device+0x94/0x1f0 [usbcore] [1296264.814392] [<ffffffffa000de7e>] ? usb_disconnect+0x8e/0x190 [usbcore] [1296264.814448] [<ffffffffa001098e>] ? hub_thread+0x53e/0x1320 [usbcore] [1296264.814500] [<ffffffff8109e400>] ? prepare_to_wait_event+0xf0/0xf0 [1296264.814555] [<ffffffffa0010450>] ? usb_reset_device+0x170/0x170 [usbcore] [1296264.814606] [<ffffffff8107f911>] ? kthread+0xc1/0xe0 [1296264.814650] [<ffffffff8107f850>] ? kthread_create_on_node+0x180/0x180 [1296264.814698] [<ffffffff814c73cc>] ? ret_from_fork+0x7c/0xb0 [1296264.814744] [<ffffffff8107f850>] ? kthread_create_on_node+0x180/0x180 greetings Hendrik -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
