BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 4491 Comm: kworker/1:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Workqueue: events free_user_ns
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3777 [inline]
 validate_chain kernel/locking/lockdep.c:3798 [inline]
 __lock_acquire+0x1864/0x6634 kernel/locking/lockdep.c:5063
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 local_lock_acquire+0x44/0x14c include/linux/local_lock_internal.h:29
 refill_obj_stock+0x90/0x360 mm/memcontrol.c:3327
 obj_cgroup_uncharge+0x14/0x20 mm/memcontrol.c:3399
 memcg_slab_free_hook+0x10c/0x1f4 mm/slab.h:569
 slab_free mm/slub.c:3682 [inline]
 kmem_cache_free+0x104/0x318 mm/slub.c:3709
 free_user_ns+0x200/0x318 kernel/user_namespace.c:219
 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292
 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439
 kthread+0x254/0x2e0 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850