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    SubjectRe: 2.6.31-rc5 regression: Oops when USB Serial disconnected while in use
    On Tue, Aug 18, 2009 at 07:00:16PM +0200, Bruno Prémont wrote:
    > Hi Greg,
    >
    > Were you able to reproduce this with a FTDI usbserial device?

    No, I can't find one in my box. I'll go dig in the attic next to try to
    find on, I knew I had one before...

    > 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...

    Yeah, it sounds like it. More info would be great to have if you can
    get it.

    thanks,

    greg k-h
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