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Commit c0540606 authored by Ben Greear's avatar Ben Greear Committed by Ingo Molnar
Browse files

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: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarBen 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: default avatarIngo Molnar <mingo@kernel.org>
parent ce6711f3

kernel/lockdep.c

+6 −1
Original line number Original line Diff line number Diff line
@@ -3190,9 +3190,14 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, 
#endif

#endif

	if (unlikely(curr->lockdep_depth >= MAX_LOCK_DEPTH)) {

	if (unlikely(curr->lockdep_depth >= MAX_LOCK_DEPTH)) {

		debug_locks_off();

		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");

		printk("turning off the locking correctness validator.\n");



		lockdep_print_held_locks(current);

		debug_show_all_locks();

		dump_stack();

		dump_stack();



		return 0;

		return 0;

	}

	}