BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 6868 Comm: syz.0.974 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
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:3871 [inline]
 validate_chain kernel/locking/lockdep.c:3892 [inline]
 __lock_acquire+0xe64/0x2a6c kernel/locking/lockdep.c:5254
 lock_acquire+0x150/0x370 kernel/locking/lockdep.c:5908
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x164/0xf14 kernel/locking/mutex.c:821
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
 __blk_mq_unfreeze_queue+0x38/0x218 block/blk-mq.c:215
 blk_mq_unfreeze_queue_nomemrestore+0x2c/0x104 block/blk-mq.c:232
 blk_mq_unfreeze_queue include/linux/blk-mq.h:962 [inline]
 elevator_change+0x218/0x35c block/elevator.c:683
 elevator_set_default+0x190/0x2b0 block/elevator.c:754
 blk_register_queue+0x2fc/0x3d4 block/blk-sysfs.c:992
 __add_disk+0x558/0xb44 block/genhd.c:524
 add_disk_fwnode+0xd4/0x340 block/genhd.c:593
 device_add_disk+0x38/0x4c block/genhd.c:623
 add_disk include/linux/blkdev.h:798 [inline]
 nbd_dev_add+0x594/0x884 drivers/block/nbd.c:2026
 nbd_genl_connect+0x7f4/0x12b0 drivers/block/nbd.c:2223
 genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2556
 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg+0xc8/0x17c net/socket.c:815
 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713
 ___sys_sendmsg+0x198/0x224 net/socket.c:2767
 __sys_sendmsg+0x158/0x204 net/socket.c:2799
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590