linux-kernel - Re: [PATCH] lockdep: increase static allocations

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Date:	Sat, 01 Mar 2014 05:33:06 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	peterz@...radead.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lockdep: increase static allocations

On Fri, 2014-02-28 at 14:32 -0500, Sasha Levin wrote: 
> On 01/08/2014 02:21 PM, Sasha Levin wrote:
> > Fuzzing a recent kernel with a large configuration hits the static
> > allocation limits and disables lockdep.
> >
> > This patch doubles the limits.
> >
> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> > ---
> >   kernel/locking/lockdep_internals.h | 6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
> > index 4f560cf..51c4b24 100644
> > --- a/kernel/locking/lockdep_internals.h
> > +++ b/kernel/locking/lockdep_internals.h
> > @@ -54,9 +54,9 @@ enum {
> >    * table (if it's not there yet), and we check it for lock order
> >    * conflicts and deadlocks.
> >    */
> > -#define MAX_LOCKDEP_ENTRIES	16384UL
> > +#define MAX_LOCKDEP_ENTRIES	32768UL
> >
> > -#define MAX_LOCKDEP_CHAINS_BITS	15
> > +#define MAX_LOCKDEP_CHAINS_BITS	16
> >   #define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)
> >
> >   #define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
> > @@ -65,7 +65,7 @@ enum {
> >    * Stack-trace: tightly packed array of stack backtrace
> >    * addresses. Protected by the hash_lock.
> >    */
> > -#define MAX_STACK_TRACE_ENTRIES	262144UL
> > +#define MAX_STACK_TRACE_ENTRIES	524288UL
> >
> >   extern struct list_head all_lock_classes;
> >   extern struct lock_chain lock_chains[];
> >
> 
> 
> Can someone pick the patch up please? PeterZ even (seemed to) acked it.

I have to do the (exact) same to rt trees, else lockdep routinely gets
in a snit, takes it's cool toys and goes home.

-Mike

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