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    SubjectRe: netconsole system freeze when cable unplugged
    On Sat, Mar 10, 2007 at 02:06:28PM +0000, Simon Arlott wrote:
    > On 10/03/07 13:38, Andi Kleen wrote:
    > >Simon Arlott <simon@fire.lp0.eu> writes:
    > >
    > >>On 09/03/07 20:42, Francois Romieu wrote:
    > >>>Simon Arlott <simon@fire.lp0.eu> :
    > >>>>When I unplug the cable the system just stops responding to
    > >>>>anything, at all. No message is printed to the console when the
    > >>>>cable is plugged back in.
    > >>>rtl8139_interrupt (spin_lock(&tp->lock))
    > >>>-> rtl8139_weird_interrupt
    > >>> -> rtl_check_media
    > >>> -> mii_check_media (printk(KERN_INFO "%s: link down\n", ...))
    > >>> [netpoll stuff here]
    > >>> -> rtl8139_poll_controller
    > >>> -> rtl8139_interrupt
    > >>> *deadlock*
    > >>>See below for my random stuff of the day. Feel free to open a PR at
    > >>>bugzilla.kernel.org if the issue does not go away.
    > >>The patch doesn't fix it, nothing changes. I'm not sure how this can
    > >>be debugged if printk won't work...
    > >
    > >earlyprintk can be called directly (early_printk()) and should
    > >work. It won't log over the network of course.
    >
    > It also won't log over the serial console either :(

    It does, you just have to configure it properly.

    earlyprintk=serial,ttySx,baud

    -Andi
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