Messages in this thread Patch in this message |  | | Date | Thu, 7 Feb 2013 04:12:34 -0800 | From | tip-bot for Ben Greear <> | Subject | [tip:core/locking] lockdep: Print more info when MAX_LOCK_DEPTH is exceeded |
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Commit-ID: 7a508076d4efdfd4fcb6fbd50a32d2c1a6e98791 Gitweb: http://git.kernel.org/tip/7a508076d4efdfd4fcb6fbd50a32d2c1a6e98791 Author: Ben Greear <greearb@candelatech.com> AuthorDate: Wed, 6 Feb 2013 10:56:19 -0800 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 7 Feb 2013 12:17:43 +0100
lockdep: Print more info when MAX_LOCK_DEPTH is exceeded
This helps debug cases where a lock is acquired over and over without being released.
Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ben Greear <greearb@candelatech.com> Cc: peterz@infradead.org Link: http://lkml.kernel.org/r/1360176979-4421-1-git-send-email-greearb@candelatech.com [ Changed the printout ordering. ] Signed-off-by: Ingo Molnar <mingo@kernel.org> --- kernel/lockdep.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/lockdep.c b/kernel/lockdep.c index c783e80..1966746 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -3192,9 +3192,14 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, #endif if (unlikely(curr->lockdep_depth >= MAX_LOCK_DEPTH)) { 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"); + + lockdep_print_held_locks(current); + debug_show_all_locks(); dump_stack(); + return 0; }
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