netdev - Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter (rmmod BUG)

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Message-Id: <1227096645.25811.17.camel@localhost.localdomain>
Date:	Wed, 19 Nov 2008 13:10:45 +0100
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: NIU driver: Sun x8 Express Quad Gigabit Ethernet Adapter
	(rmmod BUG)

On Fri, 2008-11-14 at 16:21 -0800, David Miller wrote:
> From: Jesper Dangaard Brouer <jdb@...x.dk>
> Date: Fri, 14 Nov 2008 19:49:22 +0100
> 
> > On Fri, 2008-11-14 at 13:38 +0100, Jesper Dangaard Brouer wrote:
> > > On Thu, 2008-11-13 at 14:08 -0800, David Miller wrote:
> > > > I suspect that something might be changing np->num_ldg, but
> > > > anyways the following debugging patch should provide some
> > > > clues.  Please reproduce this and send the logs it generates.
> > > 
> > > Debugging the rmmod problem...
> > > 
> > > I found a strange behavior, rmmod'ing the niu driver will only cause a
> > > kernel BUG, if the driver was loaded at boot time.  If I remove the
> > > niu.ko driver from /lib/modules/2.6.28-rc4-davem/kernel/drivers/net/
> > > reboot the system.  After that I can load and unload the niu.ko driver
> > > without problems... hmmm
> > 
> > Perhaps this is a regression, as the problem is not in v2.6.27.
> 
> This is what I started to suspect as well.
> 
> > I'll start bisecting monday...
> > 
> > I'm not sure its a NIU driver bug, as the number of changes to niu.c is
> > very small since v2.6.27. (git log v2.6.27.. drivers/net/niu.c)
> 
> Ok, let me know what your bisect finds.

I have given up bisecting because during my bisect I have hit a kernel
that will not boot on my system (it hangs...)

I have attached the full bisect history document...

-- 
Med venlig hilsen / Best regards
  Jesper Brouer
  ComX Networks A/S
  Linux Network developer
  Cand. Scient Datalog / MSc.
  Author of http://adsl-optimizer.dk
  LinkedIn: http://www.linkedin.com/in/brouer

View attachment "bisect_niu_rmmod.apt" of type "text/plain" (10091 bytes)