linux-kernel - Re: [ipw3945-devel] hang on 2.6.33-rc4

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Message-ID: <20100119054715.GA10780@gamma.logic.tuwien.ac.at>
Date:	Tue, 19 Jan 2010 06:47:16 +0100
From:	Norbert Preining <preining@...ic.at>
To:	reinette chatre <reinette.chatre@...el.com>
Cc:	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [ipw3945-devel] hang on 2.6.33-rc4

Hi Reinette,

On Fr, 15 Jan 2010, reinette chatre wrote:
> > I am having repeatable complete hard lockups on my laptop with 2.6.33-rc4.
> > 2.6.32.3 works fine.
> > 
> > I believe that it is related to the network, because sometimes I can
> > actually log in (gnomes session) and as soon as I do some network
> > related suddenly hard hang, not even Sysrq working anymore.
> > 
> > Interestingly it only happens at a specific AP where the ESSID is
> > hidden (at work). At home I can work without any problems (ESSID not
> > hidden).
> > 
> > Unfortunately I cannot set up a serial console or similar.
> 
> Does that mean no netconsole either? Does anything show up in the logs?
> Is it easy to reproduce? If so, perhaps you can have increased debug at
> that time and hopefully something will be captured in the logs when the
> problem occurs.

Ok, I can confirm that setting up the network is not the problem, nor
is it pinging other hosts. But ssh-ing into another server
made it go boom. From the screenshot I attach it looks like something
in TCP code (that explains why it does not happen in pings), below
I see tcp_data_snd_check

I managed to swithc in time to a console with tail -f syslog before
it hard locked up. The log files are empty, but I got a screenshot photo
which has some hopefully useful information. I cannot scroll up or down
anymore ...

If you want me to create a bug report or you create one in bugzilla,
I can also upload it htere, but I attach it for now.

Best wishes

Norbert
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Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
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Download attachment "photo.jpg" of type "image/jpeg" (249183 bytes)