http://www.kerneloops.org/submitresult.php?number=435696 i have an Arduino USB device connected to a USB port... an application reads from the ttyUSBx device assigned to it... When i disconnect+reconnect the Arduino, the multi-threaded application hangs in state Zl with 1 as parent PID... it needs a SIGKILL to remove it... but: the application was supposed to find arduino's new device ttyUSBy... ttyUSBx is not re-used, when i disconnect the arduino again, although nobody uses ttyUSBx anymore (at least no application)... here r some more log lines: May 30 17:48:30 vaako kernel: usb 2-1: Product: FT232R USB UART May 30 17:48:30 vaako kernel: usb 2-1: Manufacturer: FTDI May 30 17:48:30 vaako kernel: usb 2-1: SerialNumber: A70063G2 May 30 17:49:16 vaako kernel: BUG: unable to handle kernel NULL pointer derefere nce at 0000000000000088 -arne
As this is a fedora specific issue, please create the bug in their bugzilla. This should already be fixed in the 2.6.29 kernel releases.