------------[ cut here ]------------
WARNING: net/mptcp/subflow.c:1527 at subflow_data_ready+0x40b/0x790 net/mptcp/subflow.c:1527, CPU#0: syz.0.1348/12540
Modules linked in:
CPU: 0 UID: 0 PID: 12540 Comm: syz.0.1348 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [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 38 37 5b f6 40 84 ed 75 21 e8 ee 3c 5b f6 44 89 fe bf 07 00 00 00 e8 81 37 5b f6 41 83 ff 07 74 09 e8 d6 3c 5b f6 90 <0f> 0b 90 e8 cd 3c 5b f6 48 89 df e8 f5 ac ff ff 31 ff 89 c5 89 c6
RSP: 0018:ffffc90003757828 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888034b4ea00 RCX: ffffffff8b63a98f
RDX: ffff88808b7e4980 RSI: ffffffff8b63a99a RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007
R10: 0000000000000008 R11: ffff88808b7e54b0 R12: ffff88806ab97080
R13: 1ffff920006eaf05 R14: ffff888057666000 R15: 0000000000000008
FS:  00007fcb977f66c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54ea9b42f8 CR3: 0000000035c0e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: fffffffffffffffc DR6: 00000000ffff0ff0 DR7: 0000000000000400
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_established+0xa7f/0x36e0 net/ipv4/tcp_input.c:6474
 tcp_v6_do_rcv+0x11cd/0x1dc0 net/ipv6/tcp_ipv6.c:1607
 sk_backlog_rcv include/net/sock.h:1177 [inline]
 __release_sock+0x158/0x450 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: 0033:0x7fcb9958f749
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:00007fcb977f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fcb997e6090 RCX: 00007fcb9958f749
RDX: 000000000000001c RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007fcb99613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb997e6128 R14: 00007fcb997e6090 R15: 00007ffe4d22c8f8
 </TASK>