------------[ cut here ]------------
WARNING: CPU: 0 PID: 13 at net/ipv4/tcp_input.c:2613 tcp_cwnd_reduction+0x321/0x380 net/ipv4/tcp_input.c:2613
Modules linked in:
CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tcp_cwnd_reduction+0x321/0x380 net/ipv4/tcp_input.c:2613
Code: 80 09 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 f2 ef c6 f9 e8 ed ef c6 f9 41 39 ec 41 0f 4e ec eb 89 e8 df ef c6 f9 <0f> 0b eb d6 e8 36 b1 0d fa e9 38 fd ff ff e8 2c b1 0d fa e9 20 fe
RSP: 0018:ffffc90000d275a8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88807e309800 RCX: 0000000000000100
RDX: ffff888011910000 RSI: ffffffff87b0bae1 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87b0b838 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000004 R15: ffff88807e309800
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c01823a0f6 CR3: 000000007cea4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tcp_cong_control net/ipv4/tcp_input.c:3485 [inline]
 tcp_ack+0x4160/0x5920 net/ipv4/tcp_input.c:3889
 tcp_rcv_established+0x5d7/0x2130 net/ipv4/tcp_input.c:5936
 tcp_v4_do_rcv+0x600/0x8d0 net/ipv4/tcp_ipv4.c:1716
 tcp_v4_rcv+0x2768/0x3080 net/ipv4/tcp_ipv4.c:2110
 ip_protocol_deliver_rcu+0xa7/0xee0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:460 [inline]
 ip_rcv_finish+0x1da/0x2f0 net/ipv4/ip_input.c:429
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_rcv+0xaa/0xd0 net/ipv4/ip_input.c:540
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5462
 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5576
 process_backlog+0x2a5/0x6c0 net/core/dev.c:6452
 __napi_poll+0xaf/0x440 net/core/dev.c:7020
 napi_poll net/core/dev.c:7087 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7174
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>