BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 6245 Comm: syz.0.686 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline]
 validate_chain kernel/locking/lockdep.c:3876 [inline]
 __lock_acquire+0xf88/0x2f44 kernel/locking/lockdep.c:5237
 lock_acquire+0x140/0x368 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:158
 spin_lock include/linux/spinlock.h:342 [inline]
 elevator_find_get+0x34/0xe8 block/elevator.c:113
 elevator_switch+0x108/0x384 block/elevator.c:571
 elevator_change+0x200/0x358 block/elevator.c:681
 elevator_set_default+0x190/0x2b0 block/elevator.c:754
 blk_register_queue+0x2f8/0x3d0 block/blk-sysfs.c:987
 __add_disk+0x568/0xb3c block/genhd.c:528
 add_disk_fwnode+0xe8/0x42c block/genhd.c:597
 device_add_disk+0x38/0x4c block/genhd.c:627
 add_disk include/linux/blkdev.h:794 [inline]
 nbd_dev_add+0x588/0x85c drivers/block/nbd.c:1984
 nbd_genl_connect+0x7c4/0x1564 drivers/block/nbd.c:2125
 genl_family_rcv_msg_doit+0x1e4/0x2d8 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x444/0x620 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg+0xc8/0x138 net/socket.c:802
 ____sys_sendmsg+0x418/0x70c net/socket.c:2698
 ___sys_sendmsg+0x198/0x224 net/socket.c:2752
 __sys_sendmsg+0x160/0x214 net/socket.c:2784
 __do_sys_sendmsg net/socket.c:2789 [inline]
 __se_sys_sendmsg net/socket.c:2787 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2787
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
 el0_svc+0x60/0x25c arch/arm64/kernel/entry-common.c:723
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594