netdev - Re: 2.6.29.1: unregister

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Message-ID: <20090429090809.GA2995@ami.dom.local>
Date:	Wed, 29 Apr 2009 11:08:09 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	"Alexander V. Lukyanov" <lav@...is.ru>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.29.1: unregister_netdevice problem

On Wed, Apr 29, 2009 at 09:45:10AM +0400, Alexander V. Lukyanov wrote:
> On Tue, Apr 28, 2009 at 10:49:58PM +0200, Jarek Poplawski wrote:
> > Do you mean if you wait a bit longer (until the first one is really removed)
> 
> The problem is that it is never removed. I waited for at least 30 minutes.
> 
> > before running another one, it doesn't s(t)uck? Is there a change e.g. wrt.
> > 2.6.28?
> 
> I mean, 'vconfig rem' on another interface stucks if the previous vconfig
> has not finished, and it never finishes. So I cannot check if other vlan
> interfaces have the same 'refcnt' problem. So far I tried 'vconfig rem' on
> two vlan interfaces and I have a dozen.
> 
> Again, the problem only happens after I notice surprisingly high LA (30
> instead of 2-6) and interactive slowness. When it happens, I check network
> usage, disk usage, cpu usage, mem usage - they are normal or even lower than
> usual.
> 
> The server is running transparent squid and named. The last kernel version
> was 2.6.27.21 and it did not have this problem.

So looks like a regression. Alas this thing could be hard to debug and
still more data is needed. For the beginning maybe: .config, dmesg,
and a few SysRq logs while this happens e.g. Alt-PrtScr with t, d, w, q
(gzipped or as attachments to a bugzilla report). (If it's not a big
problem trying 2.6.28.9 could be helpful too.)

Thanks,
Jarek P.
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