Hi. Using 3.7.3 kernel and connecting two rs232 usb adapters, CP2102 and FT232RL, one after disconnecting another. After few cycles of reconnecting and using socat (below) I'm getting problems accessing ttyUSB0: ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fffb70c6ae0) = -1 ENOTTY (Inappropriate ioctl for device) Unloading and reloading (by udev) modules ftdio_sio, cp210x, usbserial doesn't help. I have to reboot to get ttyUSB0 working (regardless of which driver, ftdio_sio or cp210x is handling ttyUSB0 - both stop working). Any clues? Device found: [ 1215.692096] usb 6-2: new full-speed USB device number 16 using uhci_hcd [ 1216.256286] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 1216.256300] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1216.256308] usb 6-2: Product: FT232R USB UART [ 1216.256315] usb 6-2: Manufacturer: FTDI [ 1216.256322] usb 6-2: SerialNumber: A9W9TBMV [ 1216.310445] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 1216.310647] usb 6-2: Detected FT232RL [ 1216.310656] usb 6-2: Number of endpoints 2 [ 1216.310665] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 1216.310672] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 1216.310679] usb 6-2: Setting MaxPacketSize 64 [ 1216.312449] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 and a problem with accessing ttyUSB0: [root@t400 ~]# socat -ddd -s -u /dev/ttyUSB0,raw,echo=0,b115200,crnl,noctty,nonblock - | logger 2013/01/18 23:14:25 socat[8095] E tcgetattr(3, 0x7fff09579470): Inappropriate ioctl for device 2013/01/18 23:14:25 socat[8095] E tcgetattr(3, 0x7fff095793e0): Inappropriate ioctl for device 2013/01/18 23:14:25 socat[8095] E tcgetattr(3, 0x7fff095795b0): Inappropriate ioctl for device which is: munmap(0x7faf81706000, 4096) = 0 write(2, "2013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6c40): Inappropriate ioctl for device\n", 952013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6c40): Inappropriate ioctl for device ) = 95 ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fffb70c6a70) = -1 ENOTTY (Inappropriate ioctl for device) write(2, "2013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6bb0): Inappropriate ioctl for device\n", 952013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6bb0): Inappropriate ioctl for device ) = 95 ioctl(3, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fffb70c6ae0) = -1 ENOTTY (Inappropriate ioctl for device) write(2, "2013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6d80): Inappropriate ioctl for device\n", 952013/01/18 23:14:55 socat[8120] E tcgetattr(3, 0x7fffb70c6d80): Inappropriate ioctl for device ) = 95 fcntl(3, F_SETFD, FD_CLOEXEC) = 0 ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7fffb70c6f50) = -1 ENOTTY (Inappropriate ioctl for device) select(4, [3], [1], [], NULL) = 2 (in [3], out [1]) kernel log: [ 59.985654] tun: Universal TUN/TAP device driver, 1.6 [ 59.985658] tun: (C) 1999-2004 Max Krasnyansky <maxk@xxxxxxxxxxxx> [ 60.010608] ip_tables: (C) 2000-2006 Netfilter Core Team [ 60.014958] nf_conntrack version 0.5.0 (16384 buckets, 65536 max) [ 114.796110] usb 6-2: new full-speed USB device number 2 using uhci_hcd [ 115.360163] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 115.360176] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 115.360184] usb 6-2: Product: FT232R USB UART [ 115.360192] usb 6-2: Manufacturer: FTDI [ 115.360199] usb 6-2: SerialNumber: A9W9TBMV [ 115.423115] usbcore: registered new interface driver usbserial [ 115.423468] usbcore: registered new interface driver usbserial_generic [ 115.424272] usbserial: USB Serial support registered for generic [ 115.429982] usbcore: registered new interface driver ftdi_sio [ 115.430471] usbserial: USB Serial support registered for FTDI USB Serial Device [ 115.430970] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 115.431217] usb 6-2: Detected FT232RL [ 115.431226] usb 6-2: Number of endpoints 2 [ 115.431234] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 115.431241] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 115.431249] usb 6-2: Setting MaxPacketSize 64 [ 115.434351] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 122.664151] usb 6-2: USB disconnect, device number 2 [ 122.665319] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 122.665552] ftdi_sio 6-2:1.0: device disconnected [ 125.164067] usb 6-2: new full-speed USB device number 3 using uhci_hcd [ 125.328152] usb 6-2: New USB device found, idVendor=10c4, idProduct=ea60 [ 125.328165] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 125.328173] usb 6-2: Product: CP2102 USB to UART Bridge Controller [ 125.328181] usb 6-2: Manufacturer: Silicon Labs [ 125.328188] usb 6-2: SerialNumber: 0001 [ 125.342690] usbcore: registered new interface driver cp210x [ 125.342846] usbserial: USB Serial support registered for cp210x [ 125.342970] cp210x 6-2:1.0: cp210x converter detected [ 125.452106] usb 6-2: reset full-speed USB device number 3 using uhci_hcd [ 125.600719] usb 6-2: cp210x converter now attached to ttyUSB0 [ 158.376173] usb 6-2: USB disconnect, device number 3 [ 158.377385] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 [ 158.377631] cp210x 6-2:1.0: device disconnected [ 160.996090] usb 6-2: new full-speed USB device number 4 using uhci_hcd [ 161.565156] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 161.565170] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 161.565179] usb 6-2: Product: FT232R USB UART [ 161.565186] usb 6-2: Manufacturer: FTDI [ 161.565193] usb 6-2: SerialNumber: A9W9TBMV [ 161.616326] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 161.616523] usb 6-2: Detected FT232RL [ 161.616533] usb 6-2: Number of endpoints 2 [ 161.616541] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 161.616549] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 161.616556] usb 6-2: Setting MaxPacketSize 64 [ 161.618363] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 172.264170] usb 6-2: USB disconnect, device number 4 [ 172.265361] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 172.265603] ftdi_sio 6-2:1.0: device disconnected [ 175.868109] usb 6-2: new full-speed USB device number 5 using uhci_hcd [ 176.032171] usb 6-2: New USB device found, idVendor=10c4, idProduct=ea60 [ 176.032184] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 176.032193] usb 6-2: Product: CP2102 USB to UART Bridge Controller [ 176.032200] usb 6-2: Manufacturer: Silicon Labs [ 176.032207] usb 6-2: SerialNumber: 0001 [ 176.037429] cp210x 6-2:1.0: cp210x converter detected [ 176.148083] usb 6-2: reset full-speed USB device number 5 using uhci_hcd [ 176.296534] usb 6-2: cp210x converter now attached to ttyUSB0 [ 179.208158] usb 6-2: USB disconnect, device number 5 [ 179.209051] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 [ 179.209186] cp210x 6-2:1.0: device disconnected [ 181.432130] usb 6-2: new full-speed USB device number 6 using uhci_hcd [ 181.998176] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 181.998189] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 181.998198] usb 6-2: Product: FT232R USB UART [ 181.998205] usb 6-2: Manufacturer: FTDI [ 181.998212] usb 6-2: SerialNumber: A9W9TBMV [ 182.050340] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 182.050532] usb 6-2: Detected FT232RL [ 182.050542] usb 6-2: Number of endpoints 2 [ 182.050550] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 182.050558] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 182.050565] usb 6-2: Setting MaxPacketSize 64 [ 182.052353] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 190.368207] usb 6-2: USB disconnect, device number 6 [ 190.368884] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 190.369019] ftdi_sio 6-2:1.0: device disconnected [ 201.412081] usb 6-2: new full-speed USB device number 7 using uhci_hcd [ 201.928646] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 201.928658] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 201.928666] usb 6-2: Product: FT232R USB UART [ 201.928673] usb 6-2: Manufacturer: FTDI [ 201.928680] usb 6-2: SerialNumber: A9W9TBMV [ 201.975670] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 201.975954] usb 6-2: Detected FT232RL [ 201.975963] usb 6-2: Number of endpoints 2 [ 201.975971] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 201.975979] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 201.975987] usb 6-2: Setting MaxPacketSize 64 [ 201.978420] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 208.720121] usb 6-2: USB disconnect, device number 7 [ 208.720744] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 208.720914] ftdi_sio 6-2:1.0: device disconnected [ 212.752140] usb 6-2: new full-speed USB device number 8 using uhci_hcd [ 212.911539] usb 6-2: New USB device found, idVendor=10c4, idProduct=ea60 [ 212.911550] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 212.911559] usb 6-2: Product: CP2102 USB to UART Bridge Controller [ 212.911567] usb 6-2: Manufacturer: Silicon Labs [ 212.911574] usb 6-2: SerialNumber: 0001 [ 212.916700] cp210x 6-2:1.0: cp210x converter detected [ 213.028104] usb 6-2: reset full-speed USB device number 8 using uhci_hcd [ 213.172172] usb 6-2: cp210x converter now attached to ttyUSB0 [ 807.640161] usb 6-2: USB disconnect, device number 8 [ 807.641334] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 [ 807.641577] cp210x 6-2:1.0: device disconnected [ 810.640093] usb 6-2: new full-speed USB device number 9 using uhci_hcd [ 811.208154] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 811.208167] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 811.208175] usb 6-2: Product: FT232R USB UART [ 811.208183] usb 6-2: Manufacturer: FTDI [ 811.208190] usb 6-2: SerialNumber: A9W9TBMV [ 811.259306] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 811.259507] usb 6-2: Detected FT232RL [ 811.259516] usb 6-2: Number of endpoints 2 [ 811.259524] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 811.259532] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 811.259539] usb 6-2: Setting MaxPacketSize 64 [ 811.262459] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 825.496159] usb 6-2: USB disconnect, device number 9 [ 825.496836] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 825.496998] ftdi_sio 6-2:1.0: device disconnected [ 828.344083] usb 6-2: new full-speed USB device number 10 using uhci_hcd [ 828.509148] usb 6-2: New USB device found, idVendor=10c4, idProduct=ea60 [ 828.509162] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 828.509170] usb 6-2: Product: CP2102 USB to UART Bridge Controller [ 828.509178] usb 6-2: Manufacturer: Silicon Labs [ 828.509185] usb 6-2: SerialNumber: 0001 [ 828.514331] cp210x 6-2:1.0: cp210x converter detected [ 828.624117] usb 6-2: reset full-speed USB device number 10 using uhci_hcd [ 828.773481] usb 6-2: cp210x converter now attached to ttyUSB0 [ 835.416141] usb 6-2: USB disconnect, device number 10 [ 835.418207] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0 [ 835.418419] cp210x 6-2:1.0: device disconnected [ 837.176104] usb 6-2: new full-speed USB device number 11 using uhci_hcd [ 837.742175] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 837.742190] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 837.742199] usb 6-2: Product: FT232R USB UART [ 837.742206] usb 6-2: Manufacturer: FTDI [ 837.742213] usb 6-2: SerialNumber: A9W9TBMV [ 837.794292] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 837.794483] usb 6-2: Detected FT232RL [ 837.794492] usb 6-2: Number of endpoints 2 [ 837.794500] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 837.794508] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 837.794515] usb 6-2: Setting MaxPacketSize 64 [ 837.796791] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 847.320187] usb 6-2: USB disconnect, device number 11 [ 847.320837] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 847.320997] ftdi_sio 6-2:1.0: device disconnected [ 848.880117] usb 6-2: new full-speed USB device number 12 using uhci_hcd [ 849.444245] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 849.444251] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 849.444254] usb 6-2: Product: FT232R USB UART [ 849.444257] usb 6-2: Manufacturer: FTDI [ 849.444259] usb 6-2: SerialNumber: A9W9TBMV [ 849.496469] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 849.496672] usb 6-2: Detected FT232RL [ 849.496681] usb 6-2: Number of endpoints 2 [ 849.496689] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 849.496697] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 849.496704] usb 6-2: Setting MaxPacketSize 64 [ 849.498442] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 858.650031] usbserial: USB Serial deregistering driver FTDI USB Serial Device [ 858.650574] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 858.650724] usbcore: deregistering interface driver ftdi_sio [ 858.650915] ftdi_sio 6-2:1.0: device disconnected [ 861.952207] usb 6-2: USB disconnect, device number 12 [ 864.480119] usb 6-2: new full-speed USB device number 13 using uhci_hcd [ 864.992179] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 864.992192] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 864.992201] usb 6-2: Product: FT232R USB UART [ 864.992208] usb 6-2: Manufacturer: FTDI [ 864.992215] usb 6-2: SerialNumber: A9W9TBMV [ 865.050749] usbcore: registered new interface driver ftdi_sio [ 865.050913] usbserial: USB Serial support registered for FTDI USB Serial Device [ 865.051415] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 865.051594] usb 6-2: Detected FT232RL [ 865.051603] usb 6-2: Number of endpoints 2 [ 865.051611] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 865.051619] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 865.051626] usb 6-2: Setting MaxPacketSize 64 [ 865.053280] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 876.468944] usbserial: USB Serial deregistering driver cp210x [ 876.469128] usbcore: deregistering interface driver cp210x [ 879.139616] usbserial: USB Serial deregistering driver FTDI USB Serial Device [ 879.141600] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 879.141780] usbcore: deregistering interface driver ftdi_sio [ 879.141962] ftdi_sio 6-2:1.0: device disconnected [ 884.024151] usb 6-2: USB disconnect, device number 13 [ 898.164094] usb 6-2: new full-speed USB device number 14 using uhci_hcd [ 898.728171] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 898.728184] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 898.728193] usb 6-2: Product: FT232R USB UART [ 898.728200] usb 6-2: Manufacturer: FTDI [ 898.728207] usb 6-2: SerialNumber: A9W9TBMV [ 898.786148] usbcore: registered new interface driver ftdi_sio [ 898.786296] usbserial: USB Serial support registered for FTDI USB Serial Device [ 898.786801] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 898.786968] usb 6-2: Detected FT232RL [ 898.786977] usb 6-2: Number of endpoints 2 [ 898.786985] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 898.786993] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 898.787000] usb 6-2: Setting MaxPacketSize 64 [ 898.789573] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 949.517371] usbserial: USB Serial deregistering driver FTDI USB Serial Device [ 949.518070] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 949.518210] usbcore: deregistering interface driver ftdi_sio [ 949.519399] ftdi_sio 6-2:1.0: device disconnected [ 959.888070] usbserial: USB Serial deregistering driver generic [ 959.888316] usbcore: deregistering interface driver usbserial_generic [ 959.888464] usbcore: deregistering interface driver usbserial [ 966.360200] usb 6-2: USB disconnect, device number 14 [ 971.064099] usb 6-2: new full-speed USB device number 15 using uhci_hcd [ 971.629155] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 971.629169] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 971.629178] usb 6-2: Product: FT232R USB UART [ 971.629185] usb 6-2: Manufacturer: FTDI [ 971.629192] usb 6-2: SerialNumber: A9W9TBMV [ 971.686522] usbcore: registered new interface driver usbserial [ 971.686708] usbcore: registered new interface driver usbserial_generic [ 971.686890] usbserial: USB Serial support registered for generic [ 971.687838] usbcore: registered new interface driver ftdi_sio [ 971.688273] usbserial: USB Serial support registered for FTDI USB Serial Device [ 971.688433] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 971.688514] usb 6-2: Detected FT232RL [ 971.688517] usb 6-2: Number of endpoints 2 [ 971.688519] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 971.688522] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 971.688524] usb 6-2: Setting MaxPacketSize 64 [ 971.690186] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 [ 1214.112160] usb 6-2: USB disconnect, device number 15 [ 1214.112786] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 1214.112957] ftdi_sio 6-2:1.0: device disconnected [ 1215.692096] usb 6-2: new full-speed USB device number 16 using uhci_hcd [ 1216.256286] usb 6-2: New USB device found, idVendor=0403, idProduct=6001 [ 1216.256300] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1216.256308] usb 6-2: Product: FT232R USB UART [ 1216.256315] usb 6-2: Manufacturer: FTDI [ 1216.256322] usb 6-2: SerialNumber: A9W9TBMV [ 1216.310445] ftdi_sio 6-2:1.0: FTDI USB Serial Device converter detected [ 1216.310647] usb 6-2: Detected FT232RL [ 1216.310656] usb 6-2: Number of endpoints 2 [ 1216.310665] usb 6-2: Endpoint 1 MaxPacketSize 64 [ 1216.310672] usb 6-2: Endpoint 2 MaxPacketSize 64 [ 1216.310679] usb 6-2: Setting MaxPacketSize 64 [ 1216.312449] usb 6-2: FTDI USB Serial Device converter now attached to ttyUSB0 -- Arkadiusz Miśkiewicz, arekm / maven.pl -- To 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