------------[ cut here ]------------
WARNING: CPU: 0 PID: 15 at net/mptcp/subflow.c:1389 subflow_data_ready+0x251/0x2d0 net/mptcp/subflow.c:1388
Modules linked in:
CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:subflow_data_ready+0x251/0x2d0 net/mptcp/subflow.c:1388
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 e8 6a bd 89 f7 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 64 0d 00 00 e8 4f bd 89 f7 <0f> 0b e9 67 ff ff ff 44 89 f9 80 e1 07 38 c1 0f 8c f3 fd ff ff 4c
RSP: 0018:ffffc90000146f98 EFLAGS: 00010246
RAX: ffffffff89f72281 RBX: ffff888056d54c80 RCX: ffff88813feb3b80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100510b2a9
R10: ffffed100510b2a9 R11: 1ffff1100510b2a8 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888024aae860 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f835ac13000 CR3: 000000005a4b1000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_data_queue+0x2168/0x59a0 net/ipv4/tcp_input.c:5181
 tcp_rcv_state_process+0x1b5f/0x40d0 net/ipv4/tcp_input.c:6791
 tcp_v6_do_rcv+0x934/0x1320 net/ipv6/tcp_ipv6.c:1510
 tcp_v6_rcv+0x2163/0x27d0 net/ipv6/tcp_ipv6.c:1749
 ip6_protocol_deliver_rcu+0xb5e/0x13b0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x181/0x2c0 net/ipv6/ip6_input.c:483
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5581 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5695
 process_backlog+0x37c/0x6e0 net/core/dev.c:6023
 __napi_poll+0xc0/0x460 net/core/dev.c:6590
 napi_poll net/core/dev.c:6657 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6771
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:968
 smpboot_thread_fn+0x64a/0xa40 kernel/smpboot.c:164
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>