------------[ cut here ]------------
WARNING: CPU: 1 PID: 23 at net/mptcp/subflow.c:1520 subflow_data_ready+0x4b8/0x7e0 net/mptcp/subflow.c:1519
Modules linked in:
CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:subflow_data_ready+0x4b8/0x7e0 net/mptcp/subflow.c:1519
Code: 0f 0b 90 90 e9 bc fc ff ff e8 d4 2c 59 f6 48 89 df 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 6e 0e 00 00 e8 b9 2c 59 f6 90 <0f> 0b 90 e9 e5 fd ff ff 90 0f 0b 90 43 0f b6 04 2f 84 c0 0f 85 a1
RSP: 0018:ffffc900001d6d40 EFLAGS: 00010246
RAX: ffffffff8b668207 RBX: ffff88804f4eb600 RCX: ffff88801d2fda00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8880677d542f R09: 1ffff1100cefaa85
R10: dffffc0000000000 R11: ffffed100cefaa86 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880677d4b00 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000058146000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tcp_data_queue+0x548/0x6380 net/ipv4/tcp_input.c:5197
 tcp_rcv_state_process+0x2767/0x4140 net/ipv4/tcp_input.c:6922
 tcp_v6_do_rcv+0x89d/0x13f0 net/ipv6/tcp_ipv6.c:1670
 tcp_v6_rcv+0x23c2/0x2c30 net/ipv6/tcp_ipv6.c:1916
 ip6_protocol_deliver_rcu+0xcb0/0x15c0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:318
 ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:318
 __netif_receive_skb_one_core net/core/dev.c:5991 [inline]
 __netif_receive_skb+0xd3/0x380 net/core/dev.c:6104
 process_backlog+0x60e/0x14f0 net/core/dev.c:6456
 __napi_poll+0xc4/0x360 net/core/dev.c:7506
 napi_poll net/core/dev.c:7569 [inline]
 net_rx_action+0x707/0xe30 net/core/dev.c:7696
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968
 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>