BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 13208 Comm: syz.3.2333 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 busylock_acquire net/ipv4/udp.c:1514 [inline]
 __udp_enqueue_schedule_skb+0x104/0x920 net/ipv4/udp.c:1547
 __udpv6_queue_rcv_skb net/ipv6/udp.c:676 [inline]
 udpv6_queue_rcv_one_skb+0x870/0x1650 net/ipv6/udp.c:785
 udpv6_queue_rcv_skb+0x4d8/0x688 net/ipv6/udp.c:803
 udp6_unicast_rcv_skb+0x198/0x290 net/ipv6/udp.c:946
 __udp6_lib_rcv+0xa98/0x1210 net/ipv6/udp.c:1031
 udpv6_rcv+0x2c/0x3c net/ipv6/udp.c:1144
 ip6_protocol_deliver_rcu+0x928/0x11cc net/ipv6/ip6_input.c:438
 ip6_input_finish+0x164/0x294 net/ipv6/ip6_input.c:483
 NF_HOOK+0x2dc/0x36c include/linux/netfilter.h:302
 ip6_input+0x90/0xa8 net/ipv6/ip6_input.c:492
 dst_input include/net/dst.h:463 [inline]
 ip6_rcv_finish+0x1f4/0x220 net/ipv6/ip6_input.c:79
 NF_HOOK+0x2dc/0x36c include/linux/netfilter.h:302
 ipv6_rcv+0x9c/0xbc net/ipv6/ip6_input.c:310
 __netif_receive_skb_one_core net/core/dev.c:5619 [inline]
 __netif_receive_skb+0xcc/0x2a8 net/core/dev.c:5733
 process_backlog+0x408/0x710 net/core/dev.c:6061
 __napi_poll+0xb4/0x3f0 net/core/dev.c:6628
 napi_poll net/core/dev.c:6695 [inline]
 net_rx_action+0x514/0xb18 net/core/dev.c:6809
 handle_softirqs+0x318/0xc60 kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85
 do_softirq+0xf8/0x1a8 kernel/softirq.c:497
 __local_bh_enable_ip+0x250/0x37c kernel/softirq.c:421
 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x1720/0x3118 net/core/dev.c:4411
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:529 [inline]
 neigh_output include/net/neighbour.h:543 [inline]
 ip6_finish_output2+0xd28/0x1840 net/ipv6/ip6_output.c:138
 __ip6_finish_output net/ipv6/ip6_output.c:205 [inline]
 ip6_finish_output+0x594/0x92c net/ipv6/ip6_output.c:216
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x274/0x500 net/ipv6/ip6_output.c:237
 dst_output include/net/dst.h:453 [inline]
 ip6_local_out+0x120/0x15c net/ipv6/output_core.c:161
 ip6_send_skb+0x1a0/0x4e4 net/ipv6/ip6_output.c:2016
 udp_v6_send_skb+0x9f0/0x1608 net/ipv6/udp.c:1305
 udpv6_sendmsg+0x16e8/0x1fac net/ipv6/udp.c:1600
 inet6_sendmsg+0xb4/0xd8 net/ipv6/af_inet6.c:668
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518
 ___sys_sendmsg net/socket.c:2572 [inline]
 __sys_sendmmsg+0x344/0x834 net/socket.c:2658
 __do_sys_sendmmsg net/socket.c:2687 [inline]
 __se_sys_sendmmsg net/socket.c:2684 [inline]
 __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2684
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585