BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 6527 Comm: syz.4.364 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 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+0xf8/0x160 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+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 ack_update_msk net/mptcp/options.c:1064 [inline]
 mptcp_incoming_options+0x438/0x1864 net/mptcp/options.c:1215
 tcp_data_queue+0xb4/0x476c net/ipv4/tcp_input.c:5120
 tcp_rcv_established+0xd0c/0x1d08 net/ipv4/tcp_input.c:6113
 tcp_v4_do_rcv+0x38c/0xa7c net/ipv4/tcp_ipv4.c:1683
 tcp_v4_rcv+0x1eb8/0x2464 net/ipv4/tcp_ipv4.c:2114
 ip_protocol_deliver_rcu+0x350/0x77c net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x250/0x48c net/ipv4/ip_input.c:233
 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302
 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:463 [inline]
 ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449
 NF_HOOK+0x2c4/0x358 include/linux/netfilter.h:302
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5581 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5695
 process_backlog+0x408/0x714 net/core/dev.c:6023
 __napi_poll+0xb4/0x3f0 net/core/dev.c:6590
 napi_poll net/core/dev.c:6657 [inline]
 net_rx_action+0x50c/0xb10 net/core/dev.c:6771
 handle_softirqs+0x318/0xc6c 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+0xf8/0x1ac kernel/softirq.c:497
 __local_bh_enable_ip+0x250/0x380 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+0x1704/0x309c net/core/dev.c:4373
 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]
 ip_finish_output2+0xb9c/0x10a4 net/ipv4/ip_output.c:228
 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1
 ip_finish_output+0x40/0x268 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x314/0x414 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xcb0/0x16d8 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546
 __tcp_transmit_skb+0x17c4/0x2b6c net/ipv4/tcp_output.c:1405
 __tcp_send_ack+0x23c/0x4e8 net/ipv4/tcp_output.c:4059
 tcp_send_ack+0x4c/0x68 net/ipv4/tcp_output.c:4065
 mptcp_subflow_shutdown+0xcc/0x2b0 net/mptcp/protocol.c:2986
 mptcp_check_send_data_fin net/mptcp/protocol.c:3044 [inline]
 __mptcp_wr_shutdown+0x17c/0x38c net/mptcp/protocol.c:3060
 __mptcp_close+0x59c/0x6fc net/mptcp/protocol.c:3144
 mptcp_close+0x38/0x180 net/mptcp/protocol.c:3199
 inet_release+0x154/0x1d0 net/ipv4/af_inet.c:430
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1400
 __fput+0x1bc/0x7c0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x54c/0x19a8 kernel/exit.c:880
 do_group_exit+0x194/0x22c kernel/exit.c:1022
 get_signal+0x11d0/0x1310 kernel/signal.c:2871
 do_signal arch/arm64/kernel/signal.c:1081 [inline]
 do_notify_resume+0x34c/0x2b28 arch/arm64/kernel/signal.c:1134
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
vkms_vblank_simulate: vblank timer overrun