Re: 2.6.18-rc5-mm1 + all hotfixes -- BUG: MAX_STACK_TRACE_ENTRIES too low!

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On 9/3/06, Ingo Molnar <[email protected]> wrote:

* Miles Lane <[email protected]> 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 <[email protected]>
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 <[email protected]>
---
 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;



Ingo, there seemed to be a difference between the file you editted and
the one in Andrew's tree.  I remade you patch so it applies cleanly.
I'll test and let you know.  One word of caution, I only hit the
problem once and I'm not sure how to trigger the condition.  I'll do
my best.

Thanks,
       Miles

--- kernel/lockdep_internals.h~ 2006-09-03 09:59:29.000000000 -0700
+++ kernel/lockdep_internals.h  2006-09-03 10:00:55.000000000 -0700
@@ -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: H 0.0351707
-
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