netdev - Re: [PATCH 1/1] veth: don't free priv->status until dev->destructor (v2)

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Message-ID: <20090722155501.GA12820@us.ibm.com>
Date:	Wed, 22 Jul 2009 10:55:01 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, containers@...ts.osdl.org,
	sachinp@...ibm.com, netdev@...r.kernel.org, matthltc@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] veth: don't free priv->status until
	dev->destructor (v2)

Quoting Stephen Hemminger (shemminger@...tta.com):
> On Wed, 15 Jul 2009 08:50:12 -0700 (PDT)
> David Miller <davem@...emloft.net> wrote:
> 
> > From: "Serge E. Hallyn" <serue@...ibm.com>
> > Date: Fri, 26 Jun 2009 11:24:18 -0500
> > 
> > > I haven't been able to reproduce the original oops though (been
> > > trying to cat the stats sysfs files while rmmoding veth, to no
> > > avail, and haven't found an original bug report or testcase), so
> > > can't verify whether this patch prevents the original oops.
> > 
> > If you 'cat' it you're unlikely to trigger the oops.
> > 
> > You have to hold the sysfs files open, and then elsewhere do the
> > rmmod, wait, and then continue with some access to those open sysfs
> > file descriptors (f.e. do some reads).

Yup, I was doing that too, but couldn't reproduce as yet.

> > I'd also need this patch to be against current sources as they'll
> > never apply since I did the revert quite some time ago.
> > 
> > Thanks.

Ok, thanks - I'll generate a new patch against a fresh pull when
I can confirm that it actually solves the problem.

> My usual way of doing this is:
> 
> #  (sleep 30; cat /sys/class/net/ethX/statistics/tx_bytes) &
> # rmmod the_buggy_driver
> 
> wait...

Can you oops the kernel this way on latest netns?

thanks,
-serge
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