------------[ cut here ]------------
WARNING: CPU: 1 PID: 1081 at include/net/tcp.h:1228 tcp_snd_cwnd_set include/net/tcp.h:1228 [inline]
WARNING: CPU: 1 PID: 1081 at include/net/tcp.h:1228 tcp_cwnd_reduction+0x32f/0x390 net/ipv4/tcp_input.c:2665
Modules linked in:
CPU: 1 PID: 1081 Comm: syz-executor.0 Not tainted 6.6.0-rc4-syzkaller-00173-g776fe19953b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:tcp_snd_cwnd_set include/net/tcp.h:1228 [inline]
RIP: 0010:tcp_cwnd_reduction+0x32f/0x390 net/ipv4/tcp_input.c:2665
Code: 03 7e 7b 89 ab a0 09 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 3f 80 cb f8 e8 3a 80 cb f8 0f 0b eb e4 e8 31 80 cb f8 <0f> 0b eb ac e8 b8 37 21 f9 e9 2e fd ff ff e8 ae 37 21 f9 e9 18 fe
RSP: 0018:ffffc90004aff838 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802c77ee40 RCX: 0000000000000000
RDX: ffff888014fd9dc0 RSI: ffffffff88bc468f RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffffffff1976c99 R12: 0000000000000008
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000006
FS:  00007fb6b37806c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6b373ed58 CR3: 00000000793fb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_cong_control net/ipv4/tcp_input.c:3524 [inline]
 tcp_ack+0x40a5/0x5a00 net/ipv4/tcp_input.c:3938
 tcp_rcv_established+0x5ff/0x1fa0 net/ipv4/tcp_input.c:6042
 tcp_v4_do_rcv+0x669/0x9e0 net/ipv4/tcp_ipv4.c:1728
 sk_backlog_rcv include/net/sock.h:1121 [inline]
 __release_sock+0x132/0x3a0 net/core/sock.c:2983
 release_sock+0x58/0x1b0 net/core/sock.c:3520
 tcp_sendmsg+0x38/0x40 net/ipv4/tcp.c:1337
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:840
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x255/0x340 net/socket.c:2194
 __do_sys_sendto net/socket.c:2206 [inline]
 __se_sys_sendto net/socket.c:2202 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2202
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb6b2a7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb6b37800c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb6b2b9bf80 RCX: 00007fb6b2a7cae9
RDX: 0000000000000001 RSI: 00000000200004c0 RDI: 0000000000000003
RBP: 00007fb6b2ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000805 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fb6b2b9bf80 R15: 00007ffeec4ee268
 </TASK>