------------[ cut here ]------------
WARNING: net/mptcp/subflow.c:1528 at subflow_data_ready+0x49b/0x7c0 net/mptcp/subflow.c:1527, CPU#1: syz.2.7205/2131
Modules linked in:
CPU: 1 UID: 0 PID: 2131 Comm: syz.2.7205 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+0x49b/0x7c0 net/mptcp/subflow.c:1527
Code: 48 0f b9 3a e9 c9 fc ff ff e8 21 d7 79 f6 48 89 df 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 6b 0e 00 00 e8 06 d7 79 f6 90 <0f> 0b 90 e9 f2 fd ff ff 90 0f 0b 90 43 0f b6 04 2f 84 c0 0f 85 a1
RSP: 0018:ffffc9000415f740 EFLAGS: 00010293
RAX: ffffffff8b47d9fa RBX: ffff888073d65cc0 RCX: ffff888083dbbd00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888026c6c7cf R09: 1ffff11004d8d8f9
R10: dffffc0000000000 R11: ffffed1004d8d8fa R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888026c6be80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125f35000(0063) knlGS:00000000f5465b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f71941c0 CR3: 000000004f02c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tcp_data_queue+0x1e14/0x5e30 net/ipv4/tcp_input.c:5461
 tcp_rcv_established+0xf57/0x2580 net/ipv4/tcp_input.c:6474
 tcp_v4_do_rcv+0xa90/0x1430 net/ipv4/tcp_ipv4.c:1881
 sk_backlog_rcv include/net/sock.h:1177 [inline]
 __release_sock+0x265/0x3a0 net/core/sock.c:3213
 release_sock+0x5f/0x1f0 net/core/sock.c:3795
 mptcp_connect+0x649/0x830 net/mptcp/protocol.c:3985
 __inet_stream_connect+0x2ae/0xe70 net/ipv4/af_inet.c:679
 inet_stream_connect+0x66/0xa0 net/ipv4/af_inet.c:750
 __sys_connect_file net/socket.c:2089 [inline]
 __sys_connect+0x316/0x440 net/socket.c:2108
 __do_sys_connect net/socket.c:2114 [inline]
 __se_sys_connect net/socket.c:2111 [inline]
 __ia32_sys_connect+0x7a/0x90 net/socket.c:2111
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x1f7/0x590 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f95539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f546555c EFLAGS: 00000206 ORIG_RAX: 000000000000016a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000040
RDX: 000000000000001c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   4:	10 07                	adc    %al,(%rdi)
   6:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   a:	10 08                	adc    %cl,(%rax)
   c:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	ret
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop