------------[ cut here ]------------
WARNING: CPU: 0 PID: 29091 at net/ipv4/tcp_input.c:2615 tcp_cwnd_reduction+0x329/0x390 net/ipv4/tcp_input.c:2615
Modules linked in:
CPU: 0 PID: 29091 Comm: syz-executor.4 Not tainted 5.17.0-rc3-syzkaller-00043-gf4bc5bbb5fef #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tcp_cwnd_reduction+0x329/0x390 net/ipv4/tcp_input.c:2615
Code: 80 09 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 5a 77 c3 f9 e8 55 77 c3 f9 44 39 e5 41 0f 4f ec eb 81 e8 47 77 c3 f9 <0f> 0b eb d6 e8 9e c6 0a fa e9 33 fd ff ff e8 94 c6 0a fa e9 1c fe
RSP: 0018:ffffc90010c8f6c8 EFLAGS: 00010212
RAX: 000000000000e3fc RBX: ffff888077322640 RCX: ffffc90003405000
RDX: 0000000000040000 RSI: ffffffff87b50149 RDI: 0000000000000003
RBP: ffffc90010c8f8c8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87b4fe9b R11: 0000000000000000 R12: 000000000000000f
R13: 0000000000000000 R14: 0000000000000008 R15: ffff888077322640
FS:  00007feb82c71700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2526ecc1b8 CR3: 0000000033006000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_cong_control net/ipv4/tcp_input.c:3487 [inline]
 tcp_ack+0x40f4/0x5900 net/ipv4/tcp_input.c:3891
 tcp_rcv_established+0x5d9/0x2130 net/ipv4/tcp_input.c:5938
 tcp_v6_do_rcv+0x802/0x13b0 net/ipv6/tcp_ipv6.c:1525
 sk_backlog_rcv include/net/sock.h:1037 [inline]
 __release_sock+0x134/0x3b0 net/core/sock.c:2779
 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2799
 sk_flush_backlog include/net/sock.h:1127 [inline]
 tcp_sendmsg_locked+0x295f/0x3020 net/ipv4/tcp.c:1278
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1444
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:643
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 __sys_sendto+0x21c/0x320 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7feb8431d059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007feb82c71168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007feb84430030 RCX: 00007feb8431d059
RDX: fffffffffffffea7 RSI: 0000000020f6f000 RDI: 0000000000000005
RBP: 00007feb8437708d R08: 0000000020b63fe4 R09: 000000000000001c
R10: 0000000020000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007feb84963b1f R14: 00007feb82c71300 R15: 0000000000022000
 </TASK>