linux-kernel - Re: 2.6.18-rc4-mm[1,2,3] -- Network card not getting assigned an "eth" device name

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Date:	Mon, 28 Aug 2006 12:03:28 -0700
From:	Andrew Morton <akpm@...l.org>
To:	"Miles Lane" <miles.lane@...il.com>
Cc:	"David Miller" <davem@...emloft.net>,
	"Dan Williams" <dcbw@...hat.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jeremy@...p.org,
	Robert Love <rml@...ell.com>
Subject: Re: 2.6.18-rc4-mm[1,2,3] -- Network card not getting assigned an
 "eth" device name

On Mon, 28 Aug 2006 08:52:02 -0700
"Miles Lane" <miles.lane@...il.com> wrote:

> On 8/27/06, David Miller <davem@...emloft.net> wrote:
> > From: Andrew Morton <akpm@...l.org>
> > Date: Sun, 27 Aug 2006 00:19:43 -0700
> >
> > > Jeremy reported that a while back too.  I do not know what is causing it
> > > and as far as I know no net developers have yet looked into it.
> >
> > A debugging patch like this one should help figure out the culprit.
> >
> > If we don't see the gibberish netdevice name printed in the kernel
> > logs, then likely something is corrupting the netdevice structure or
> > the memory holding the name.
> >
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index d4a1ec3..45f9b19 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -738,6 +738,11 @@ int dev_change_name(struct net_device *d
> >
> >         if (!dev_valid_name(newname))
> >                 return -EINVAL;
> > +#if 1
> > +       printk("[%s:%d]: Changing netdevice name from [%s] to [%s]\n",
> > +              current->comm, current->pid,
> > +              dev->name, newname);
> > +#endif
> >
> >         if (strchr(newname, '%')) {
> >                 err = dev_alloc_name(dev, newname);
> >
> 
> Dan, do you have any idea why NetworkManager from Ubuntu 6.06.1
> would be corrupting network device names on recent MM kernels?
> I haven't seen this happening with Ubuntu's kernels.  If you like, I can
> send you my kernel .config file.
> 
> Here's what I get:
> 

grepping for `ioctl' gives:

ioctl(9, SIOCGIWNAME, 0xbfe38d8c)                 = -1 EINVAL (Invalid argument)
ioctl(9, SIOCETHTOOL, 0xbfe38d2c)                 = 0
ioctl(11, SIOCGIFHWADDR, {ifr_name="eth0", ???})  = -1 ENODEV (No such device)
ioctl(11, SIOCGIFFLAGS, {ifr_name="eth0", ???})   = -1 ENODEV (No such device)

Perhaps you could generate the strace output for 2.6.18-rc5, grep that for
ioctl, look for differences?  That initial SIOCGIWNAME failure is fishy.
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