Re: Netconsole & sungem: hang when link down

[Colin Leroy]

On 06 Oct 2004 at 18h10, Benjamin Herrenschmidt wrote:

Hi, 

> On Wed, 2004-10-06 at 16:39, Colin Leroy wrote:
> > Hi,
> > 
> > I noticed that, if you have netconsole set up and using a sungem
> > card, and if the network cable is not plugged in, that the whole
> > kernel hangs shortly after the "device not up yet, forcing it"
> > netconsole message. I suspect this is due to the autoneg in sungem,
> > but didn't have time to look further. 
> > 
> > Would you have any hints on the cause of this problem?
> 
> Not sure, I suppose the driver is doing printk's with spinlocks held
> from the autoneg stuff and there is a spinlock deadlock happening ...

Thanks. I'll look into this. If I'm not mistaken, I've got no way of
catching it easily, do I ? CONFIG_DEBUG_SPINLOCK's help seems to say
that I need NMI watchdog in order to catch deadlocks, which is only
available on x86(_64).

-- 
Colin
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