linux-kernel - Re: netconsole system freeze when cable unplugged

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Message-ID: <20070310203157.GB10459@waste.org>
Date:	Sat, 10 Mar 2007 14:31:57 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Simon Arlott <simon@...e.lp0.eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: netconsole system freeze when cable unplugged

On Fri, Mar 09, 2007 at 09:42:43PM +0100, 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*

Probably the best thing that can be done here aside from moving
mii_check_media outside interrupt handling is to add
netpoll_plug/unplug(dev) methods that push work off to netpoll's queue
for drivers that have a netpoll recursion problem.

-- 
Mathematics is the supreme nostalgia of our time.
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