Hi Greg, Were you able to reproduce this with a FTDI usbserial device? I just had a short look with 2.6.31-rc6, it crashes harder... once kernel did panic with general protection fault after reporting tty_port_close_start: count=-1 The second time id started output of an Oops but only half of the first line ever showed up on screen (Intel KMS). Note: this was with just usbserial.ko and ftdi_sio.ko rebuilt with CONFIG_DEBUG_INFO=y in the hope to find out what did access a bad pointer. (make CONFIG_DEBUG_INFO=y drivers/usb/serial/$module.ko) Will retry now with a fresh compile with CONFIG_DEBUG_INFO enabled for whole kernel and see if I can get better information, eventually switching to vesa framebuffer in case the partial output happens again. This pretty much looks like unbalanced ref-count... Thanks, Bruno On Mon, 10 August 2009 Greg KH <gregkh@xxxxxxx> wrote: > > > I have not tried yet with a different USB serial device but will > > > do so soon to see if I can reproduce it there. (the other > > > USBSerial device I have is: 067b:2303 Prolific Technology, Inc. > > > PL2303 Serial Port) > > > > I can't reproduce with this one. > > > > Similar setup, but instead of SheevaPlug (with it's kernel started > > with console=ttyS0,115200 + agetty run by init) I just started > > agetty (same parameters) on a x86 box with uart serial port (e.g. > > that x86 kernel does not have console kernel parameter) and > > connected that one via NullModem cable to the Prolific USBSerial > > converter. > > > > In this case, no matter how often I pull the USBSerial converter > > there is no Oops. > > > > So it must be something that FTDI driver does differently from e.g. > > Prolific one. > > Ok, thanks, I'll dig through my big box of usb devices to try to find > a ftdi device, I was testing this out on a pl2303 device, which is > why I couldn't reproduce it it seems. -- 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
