BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events mptcp_worker
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
 seqcount_lockdep_reader_access+0x6c/0xf8 include/linux/seqlock.h:73
 ip_vs_conn_out_get+0x2a0/0xd90 net/netfilter/ipvs/ip_vs_conn.c:538
 ip_vs_conn_out_get_proto+0xec/0x14c net/netfilter/ipvs/ip_vs_conn.c:590
 ip_vs_out_hook+0x4c0/0xc28 net/netfilter/ipvs/ip_vs_core.c:1575
 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
 nf_hook_slow+0xb4/0x210 net/netfilter/core.c:619
 nf_hook+0x1f0/0x364 include/linux/netfilter.h:273
 __ip_local_out+0x548/0x65c net/ipv4/ip_output.c:120
 ip_local_out+0x3c/0x148 net/ipv4/ip_output.c:129
 __ip_queue_xmit+0xd0c/0x1638 net/ipv4/ip_output.c:534
 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:548
 __tcp_transmit_skb+0x1e04/0x369c net/ipv4/tcp_output.c:1715
 __tcp_send_ack+0x1d8/0x428 net/ipv4/tcp_output.c:4500
 tcp_send_ack+0x50/0x68 net/ipv4/tcp_output.c:4506
 __mptcp_subflow_send_ack+0x80/0xb0 net/mptcp/protocol.c:552
 mptcp_subflow_send_ack net/mptcp/protocol.c:560 [inline]
 mptcp_send_ack+0xac/0x124 net/mptcp/protocol.c:569
 mptcp_check_data_fin+0x1a8/0x25c net/mptcp/protocol.c:657
 mptcp_worker+0x18c/0xbdc net/mptcp/protocol.c:2994
 process_one_work kernel/workqueue.c:3314 [inline]
 process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397
 worker_thread+0x754/0xba0 kernel/workqueue.c:3478
 kthread+0x2f8/0x3c8 kernel/kthread.c:436
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842