On Fri, Jan 27, 2012 at 08:25:10PM +0000, Ross Ryles wrote: > > Can you reproduce it on a vanilla kernel? > > I've just reproduced it on vanilla 3.2.1 and with debug enabled. Log attached. Excellent. The backtrace at the end points to your host controller (at least ftdi_sio is not to blame). The generic usb_serial close is killing the read_urb and then something goes wrong. What do you say about this, Alan? Jan 27 20:08:11 localhost kernel: [ 305.801102] drivers/usb/serial/ftdi_sio.c: ftdi_close Jan 27 20:11:06 localhost kernel: [ 480.593315] INFO: task openclose.pl:835 blocked for more than 120 seconds. Jan 27 20:11:06 localhost kernel: [ 480.593663] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Jan 27 20:11:06 localhost kernel: [ 480.593827] openclose.pl D 0000000100000608 0 835 830 0x00000000 Jan 27 20:11:06 localhost kernel: [ 480.593832] ffff8800b1d99cc8 0000000000000086 ffffffff00000000 0000000000000002 Jan 27 20:11:06 localhost kernel: [ 480.593837] ffff8800b6334740 ffff8800b1d99fd8 ffff8800b1d99fd8 ffff8800b1d99fd8 Jan 27 20:11:06 localhost kernel: [ 480.593841] ffff8800b62bf200 ffff8800b6334740 ffff8800b1d99c08 ffffffffa01231cd Jan 27 20:11:06 localhost kernel: [ 480.593845] Call Trace: Jan 27 20:11:06 localhost kernel: [ 480.593869] [<ffffffffa01231cd>] ? start_ed_unlink+0x1d/0x70 [ohci_hcd] Jan 27 20:11:06 localhost kernel: [ 480.593874] [<ffffffffa0124607>] ? ohci_urb_dequeue+0x77/0xc0 [ohci_hcd] Jan 27 20:11:06 localhost kernel: [ 480.593880] [<ffffffff81237cf7>] ? kobject_put+0x27/0x60 Jan 27 20:11:06 localhost kernel: [ 480.593884] [<ffffffff81303307>] ? put_device+0x17/0x20 Jan 27 20:11:06 localhost kernel: [ 480.593889] [<ffffffff814258bf>] schedule+0x3f/0x60 Jan 27 20:11:06 localhost kernel: [ 480.593899] [<ffffffffa000d4c5>] usb_kill_urb+0x75/0xb0 [usbcore] Jan 27 20:11:06 localhost kernel: [ 480.593904] [<ffffffff81088cb0>] ? abort_exclusive_wait+0xb0/0xb0 Jan 27 20:11:06 localhost kernel: [ 480.593909] [<ffffffffa0519f30>] generic_cleanup+0x50/0xe0 [usbserial] Jan 27 20:11:06 localhost kernel: [ 480.593913] [<ffffffffa051a063>] usb_serial_generic_close+0x23/0x50 [usbserial] Jan 27 20:11:06 localhost kernel: [ 480.593917] [<ffffffffa05281a9>] ftdi_close+0x39/0x70 [ftdi_sio] Jan 27 20:11:06 localhost kernel: [ 480.593921] [<ffffffffa0517029>] serial_down+0x29/0x30 [usbserial] Jan 27 20:11:06 localhost kernel: [ 480.593925] [<ffffffff812dbb02>] tty_port_shutdown+0x62/0x70 Jan 27 20:11:06 localhost kernel: [ 480.593928] [<ffffffff812dc5fc>] tty_port_close+0x2c/0x60 Jan 27 20:11:06 localhost kernel: [ 480.593932] [<ffffffffa0517802>] serial_close+0x42/0x80 [usbserial] Jan 27 20:11:06 localhost kernel: [ 480.593936] [<ffffffff812d3899>] tty_release+0x169/0x5c0 Jan 27 20:11:06 localhost kernel: [ 480.593940] [<ffffffff8104f373>] ? __wake_up+0x53/0x70 Jan 27 20:11:06 localhost kernel: [ 480.593944] [<ffffffff811a5332>] ? fsnotify+0x1c2/0x2a0 Jan 27 20:11:06 localhost kernel: [ 480.593949] [<ffffffff81168c0a>] fput+0xda/0x210 Jan 27 20:11:06 localhost kernel: [ 480.593952] [<ffffffff81165406>] filp_close+0x66/0x90 Jan 27 20:11:06 localhost kernel: [ 480.593955] [<ffffffff811654e4>] sys_close+0xb4/0x120 Jan 27 20:11:06 localhost kernel: [ 480.593959] [<ffffffff814290c2>] system_call_fastpath+0x16/0x1b Thanks, Johan -- 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
