kernel/panic.c: turn off locks debug before releasing console lock

Commit 08d78658f3 ("panic: release stale console lock to always get the
logbuf printed out") introduced an unwanted bad unlock balance report when
panic() is called directly and not from OOPS (e.g.  from out_of_memory()).
The difference is that in case of OOPS we disable locks debug in
oops_enter() and on direct panic call nobody does that.

Fixes: 08d78658f3 ("panic: release stale console lock to always get the logbuf printed out")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Xie XiuQi <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: "K. Y. Srinivasan" <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

kernel/panic.c

@@ -152,8 +152,11 @@ void panic(const char *fmt, ...)
 	 * We may have ended up stopping the CPU holding the lock (in
 	 * smp_send_stop()) while still having some valuable data in the console
 	 * buffer.  Try to acquire the lock then release it regardless of the
-	 * result.  The release will also print the buffers out.
+	 * result.  The release will also print the buffers out.  Locks debug
+	 * should be disabled to avoid reporting bad unlock balance when
+	 * panic() is not being callled from OOPS.
 	 */
+	debug_locks_off();
 	console_trylock();
 	console_unlock();