netdev - [PATCH] lockdep: Print more info when MAX_LOCK

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Message-Id: <1360176762-4321-1-git-send-email-greearb@candelatech.com>
Date:	Wed,  6 Feb 2013 10:52:42 -0800
From:	greearb@...delatech.com
To:	netdev@...r.kernel.org
Cc:	peterz@...radead.org, rostedt@...dmis.org, mingo@...nel.org,
	Ben Greear <greearb@...delatech.com>
Subject: [PATCH] lockdep:  Print more info when MAX_LOCK_DEPTH is exceeded.

From: Ben Greear <greearb@...delatech.com>

This helps debug cases where a lock is acquired over and
over without being released.

Signed-off-by: Ben Greear <greearb@...delatech.com>
---
 kernel/lockdep.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 7981e5b..7e76b69 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -3189,8 +3189,12 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 		return 0;
 #endif
 	if (unlikely(curr->lockdep_depth >= MAX_LOCK_DEPTH)) {
+		debug_show_all_locks();
+		lockdep_print_held_locks(current);
+
 		debug_locks_off();
-		printk("BUG: MAX_LOCK_DEPTH too low!\n");
+		printk("BUG: MAX_LOCK_DEPTH too low, depth: %i  max: %lu!\n",
+		       curr->lockdep_depth, MAX_LOCK_DEPTH);
 		printk("turning off the locking correctness validator.\n");
 		dump_stack();
 		return 0;
-- 
1.7.3.4

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