linux-kernel - Re: 2.6.18-rc5-mm1 + all hotfixes -- BUG: MAX_STACK_TRACE

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Message-ID: <20060903125458.GA21390@elte.hu>
Date:	Sun, 3 Sep 2006 14:54:58 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Miles Lane <miles.lane@...il.com>
Cc:	Andrew Morton <akpm@...l.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.18-rc5-mm1 + all hotfixes -- BUG: MAX_STACK_TRACE_ENTRIES too low!

* Miles Lane <miles.lane@...il.com> wrote:

> Sorry Andrew.  I don't see clues here to help me target the report to 
> a maintainer. I hope this helps.
> 
> BUG: MAX_STACK_TRACE_ENTRIES too low!
> turning off the locking correctness validator.

Miles, could you try the patch below? (Andrew: if this solves Miles' 
problem then i think this is v2.6.18 material too. [The other 
possibility would be some permanent stack-trace entries leak, in which 
case the patch will not help. If that happens then we'll have to debug 
this some more.])

	Ingo

---------------->
From: Ingo Molnar <mingo@...e.hu>
Subject: lockdep: double the number of stack-trace entries

Miles Lane reported the "BUG: MAX_STACK_TRACE_ENTRIES too low!" message,
which means that during normal use his system produced enough lockdep
events so that the 128-thousand entries stack-trace array got exhausted.
Double the size of the array.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/lockdep_internals.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/kernel/lockdep_internals.h
===================================================================
--- linux.orig/kernel/lockdep_internals.h
+++ linux/kernel/lockdep_internals.h
@@ -27,7 +27,7 @@
  * Stack-trace: tightly packed array of stack backtrace
  * addresses. Protected by the hash_lock.
  */
-#define MAX_STACK_TRACE_ENTRIES	131072UL
+#define MAX_STACK_TRACE_ENTRIES	262144UL

 extern struct list_head all_lock_classes;

-- 
VGER BF report: U 0.5
-
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