------------[ cut here ]------------
WARNING: net/mptcp/subflow.c:1527 at subflow_data_ready+0x40b/0x790 net/mptcp/subflow.c:1527, CPU#0: syz.2.4863/9125
Modules linked in:
CPU: 0 UID: 0 PID: 9125 Comm: syz.2.4863 Tainted: G     U    I  L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [I]=FIRMWARE_WORKAROUND, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:subflow_data_ready+0x40b/0x790 net/mptcp/subflow.c:1527
Code: 89 ee e8 a8 49 5d f6 40 84 ed 75 21 e8 5e 4f 5d f6 44 89 fe bf 07 00 00 00 e8 f1 49 5d f6 41 83 ff 07 74 09 e8 46 4f 5d f6 90 <0f> 0b 90 e8 3d 4f 5d f6 48 89 df e8 f5 ac ff ff 31 ff 89 c5 89 c6
RSP: 0018:ffffc900041df798 EFLAGS: 00010287
RAX: 0000000000001d33 RBX: ffff88807cf71980 RCX: ffffc9000c3b9000
RDX: 0000000000080000 RSI: ffffffff8b6109aa RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007
R10: 000000000000000b R11: ffff88804b5e8b30 R12: ffff888043db5400
R13: 1ffff9200083bef3 R14: ffff88805985e000 R15: 000000000000000b
FS:  00007f48c7a766c0(0000) GS:ffff8881248fc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31210ff8 CR3: 000000008439a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tcp_data_ready+0x114/0x5a0 net/ipv4/tcp_input.c:5371
 tcp_data_queue+0x1ac2/0x4ff0 net/ipv4/tcp_input.c:5461
 tcp_rcv_state_process+0xfb6/0x6540 net/ipv4/tcp_input.c:7185
 tcp_v4_do_rcv+0x68e/0x10a0 net/ipv4/tcp_ipv4.c:1904
 sk_backlog_rcv include/net/sock.h:1177 [inline]
 __release_sock+0x361/0x450 net/core/sock.c:3213
 release_sock+0x5a/0x220 net/core/sock.c:3795
 mptcp_connect+0x914/0xae0 net/mptcp/protocol.c:3991
 __inet_stream_connect+0x915/0xf50 net/ipv4/af_inet.c:679
 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:750
 __sys_connect_file+0x141/0x1a0 net/socket.c:2089
 __sys_connect+0x13b/0x160 net/socket.c:2108
 __do_sys_connect net/socket.c:2114 [inline]
 __se_sys_connect net/socket.c:2111 [inline]
 __x64_sys_connect+0x72/0xb0 net/socket.c:2111
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f48c6b8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f48c7a76038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f48c6de5fa0 RCX: 00007f48c6b8f7c9
RDX: 0000000000000051 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f48c6c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48c6de6038 R14: 00007f48c6de5fa0 R15: 00007ffe4d8bc618
 </TASK>