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SubjectRe: 2.6.18-rc5-mm1 + all hotfixes -- BUG: MAX_STACK_TRACE_ENTRIES too low!
On 9/3/06, Miles Lane <miles.lane@gmail.com> wrote:
> On 9/3/06, Ingo Molnar <mingo@elte.hu> wrote:
> >
> > * 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;
> >
> >
>
> 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;
>

By the way, after making this change "make all install modules
modules_install" didn't seem to notice that the file had been
modified. I backed up .config, ran "make mrproper", etc. Is this a
build dependency checker bug?

Thanks,
Miles

--
VGER BF report: H 4.35163e-06
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