On Fri, Jan 27, 2012 at 12:22:42PM +0000, Ross Ryles wrote: > Hi, > > I seem to be experiencing intermittent problems with calling close() > on an ftdi_sio device. > > To try and narrow the problem down I've written a small perl script > which loops round opening and closing /dev/ttyUSB0 with a sleep(1) > between each call. After somewhere between 20 and 200 cycles the > system hangs trying to close the device. > > Once the system hangs, I can switch between virtual terminals and > enter username password for them, but nothing more. The same is true > of ssh connections. It prompts for a password then goes silent. A > hard reboot is then required. This sounds quite odd. I'm opening and closing the device for thousands of iterations here without any problems. Can you reproduce it using another USB-serial device or serial port? On another host? > I had loaded the ftdi_sio module with the debug option, but I won't be > able to get to the logs from the crash for a few hours. Would be interesting to see those. So you're able to reproduce with debugging enabled? > I'm running arch linux 3.2.2-1. Can you reproduce it on a vanilla kernel? 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
