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Date: Tue, 16 Jun 2009 12:00:15 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Steven Rostedt <rostedt@goodmis.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: bug in tty ldisc and friends
Message-ID: <20090616100015.GD6432@elte.hu>
References: <alpine.DEB.2.00.0906160144340.26673@gandalf.stny.rr.com> <20090616093741.0d5b36bc@lxorguk.ukuu.org.uk> <20090616085028.GA13771@elte.hu> <20090616095706.36f01282@lxorguk.ukuu.org.uk>
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got the debug data off-list (it's large):

 lock-classes:                         1763 [max: 8191]
 direct dependencies:                  9104 [max: 16384]
 indirect dependencies:              129622
 all direct dependencies:           1129624
 dependency chains:                    9781 [max: 32768]
 dependency chain hlocks:             27553 [max: 163840]
 in-hardirq chains:                    1573
 in-softirq chains:                     131
 in-process chains:                    8077
 stack-trace entries:                262144 [max: 262144]

stack-trace entries ran out. And it seems like you didnt quadruple 
MAX_STACK_TRACE_ENTRIES to 1 million entries.

Do we run out of entries right during bootup? Are you 
loading/unloading modules a lot perhaps? Could you send your .config 
please? (assuming a plain bootup triggers it - that should make it 
reproducible to me too)

Thanks,

	Ingo