On Tue, Apr 23, 2019 at 09:13:06AM -0700, syzbot wrote: > DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS) > WARNING: CPU: 0 PID: 1553 at kernel/locking/lockdep.c:3673 > __lock_acquire+0x1887/0x3fb0 kernel/locking/lockdep.c:3673 > down_write+0x38/0x90 kernel/locking/rwsem.c:70 > anon_vma_lock_write include/linux/rmap.h:120 [inline] All anon_vmas share the same lockdep map, so I think this is just a victim of someone else who's taken all the lockdep classes.
