------------[ cut here ]------------
WARNING: CPU: 0 PID: 1124 at net/mptcp/subflow.c:1389 subflow_data_ready+0x251/0x2d0 net/mptcp/subflow.c:1388
Modules linked in:
CPU: 0 PID: 1124 Comm: kworker/u4:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: krdsd rds_send_worker
RIP: 0010:subflow_data_ready+0x251/0x2d0 net/mptcp/subflow.c:1388
Code: 41 5c 41 5d 41 5e 41 5f 5d c3 e8 8a c0 6f f7 48 89 df 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 94 0a 00 00 e8 6f c0 6f 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:ffffc900000071b8 EFLAGS: 00010246
RAX: ffffffff8a12b201 RBX: ffff88802ff4bfc0 RCX: ffff888026c38000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888079131547 R09: 1ffff1100f2262a8
R10: dffffc0000000000 R11: ffffed100f2262a9 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888018664460 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000004f000 CR3: 000000005f3d7000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 tcp_data_queue+0x21af/0x5990 net/ipv4/tcp_input.c:5181
 tcp_rcv_state_process+0x1bb2/0x4140 net/ipv4/tcp_input.c:6791
 tcp_v6_do_rcv+0x934/0x1320 net/ipv6/tcp_ipv6.c:1510
 tcp_v6_rcv+0x21d9/0x2840 net/ipv6/tcp_ipv6.c:1749
 ip6_protocol_deliver_rcu+0x900/0x13a0 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x181/0x2c0 net/ipv6/ip6_input.c:483
 NF_HOOK+0x329/0x3b0 include/linux/netfilter.h:302
 NF_HOOK+0x329/0x3b0 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+0x38d/0x6f0 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+0x5dd/0xb20 net/core/dev.c:6771
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 do_softirq+0x142/0x210 kernel/softirq.c:497
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:421
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x1c61/0x37f0 net/core/dev.c:4373
 neigh_output include/net/neighbour.h:545 [inline]
 ip6_finish_output2+0xdd6/0x15d0 net/ipv6/ip6_output.c:138
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_xmit+0x10c5/0x1860 net/ipv6/ip6_output.c:357
 inet6_csk_xmit+0x42a/0x6b0 net/ipv6/inet6_connection_sock.c:135
 __tcp_transmit_skb+0x1c92/0x31a0 net/ipv4/tcp_output.c:1405
 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline]
 tcp_write_xmit+0x1761/0x6300 net/ipv4/tcp_output.c:2720
 __tcp_push_pending_frames+0x93/0x340 net/ipv4/tcp_output.c:2905
 do_tcp_sendpages+0x28be/0x30c0 net/ipv4/tcp.c:1122
 tcp_sendpage_locked net/ipv4/tcp.c:1148 [inline]
 tcp_sendpage+0xa1/0xc0 net/ipv4/tcp.c:1158
 inet_sendpage+0x1b5/0x340 net/ipv4/af_inet.c:873
 rds_tcp_xmit+0x606/0xb20 net/rds/tcp_send.c:118
 rds_send_xmit+0x1264/0x2610 net/rds/send.c:366
 rds_send_worker+0x79/0x2b0 net/rds/threads.c:200
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>