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

* Miles Lane <miles.lane@gmail.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@elte.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@elte.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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