netdev - Re: netconsole system freeze when cable unplugged

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Date:	10 Mar 2007 14:38:23 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Francois Romieu <romieu@...zoreil.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: netconsole system freeze when cable unplugged

Simon Arlott <simon@...e.lp0.eu> writes:

> On 09/03/07 20:42, Francois Romieu wrote:
> > Simon Arlott <simon@...e.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.

-Andi
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