linux-kernel - Re: bug in tty ldisc and friends

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Message-ID: <20090616090937.GE13771@elte.hu>
Date:	Tue, 16 Jun 2009 11:09:37 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: bug in tty ldisc and friends


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > Hm, have you tried the patch i sent to you that extends the 
> > number-lock-locks-tracked limit you have run into? It is 
> > trivial.
> 
> I tried upping the number of locks a while ago - it has no effect, 
> which checking on irc seems to fit the general pattern of the 
> reports against Fedora.
> 
> The good thing is I trigger this at boot time reliably - so if 
> you've got some debug stuff you want to stick in I can do that

Could you please turn on CONFIG_DEBUG_LOCKDEP=y and after the 
overflow has happened, send us (or upload somewhere) the output of 
"cat /proc/lock*" ?

If we run out of chains then the source of the leak should be 
clearly visible in that debug outpt.

Thanks,

	Ingo
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