ccid3_first_li: No RTT estimate available, using fallback RTT
ccid3_first_li: X_recv==0
BUG: stored value of X_recv is zero at net/dccp/ccids/ccid3.c:691/ccid3_first_li()
CPU: 1 PID: 6587 Comm: syz-executor.0 Not tainted 5.18.0-rc2-syzkaller-01070-g85ef87ba9bc2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 ccid3_first_li.cold+0x67/0x17a net/dccp/ccids/ccid3.c:691
 tfrc_lh_interval_add+0x640/0x8e0 net/dccp/ccids/lib/loss_interval.c:157
 tfrc_rx_handle_loss+0x431/0x1dd0 net/dccp/ccids/lib/packet_history.c:328
 ccid3_hc_rx_packet_recv+0x385/0xe90 net/dccp/ccids/ccid3.c:744
 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
 dccp_deliver_input_to_ccids+0xe1/0x260 net/dccp/input.c:176
 dccp_rcv_established net/dccp/input.c:374 [inline]
 dccp_rcv_established+0x107/0x160 net/dccp/input.c:364
 dccp_v4_do_rcv+0x130/0x1a0 net/dccp/ipv4.c:667
 sk_backlog_rcv include/net/sock.h:1051 [inline]
 __sk_receive_skb+0x299/0x820 net/core/sock.c:562
 dccp_v4_rcv+0xfc0/0x1bb0 net/dccp/ipv4.c:890
 ip_protocol_deliver_rcu+0xa3/0xb30 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2ee/0x4c0 net/ipv4/ip_input.c:233
 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:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish+0x1cb/0x2f0 net/ipv4/ip_input.c:437
 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:557
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5435
 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5549
 process_backlog+0x3a0/0x7c0 net/core/dev.c:5877
 __napi_poll+0xb3/0x6e0 net/core/dev.c:6443
 napi_poll net/core/dev.c:6510 [inline]
 net_rx_action+0x8ec/0xc60 net/core/dev.c:6597
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:459
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:451 [inline]
 __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:764 [inline]
 ip_finish_output2+0x7d0/0x2170 net/ipv4/ip_output.c:229
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x32/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x196/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x8fe/0x1c00 net/ipv4/ip_output.c:532
 dccp_transmit_skb+0x973/0x12c0 net/dccp/output.c:138
 dccp_send_ack.part.0+0x16b/0x2f0 net/dccp/output.c:600
 dccp_send_ack+0x53/0x70 net/dccp/output.c:584
 ccid3_hc_rx_send_feedback net/dccp/ccids/ccid3.c:635 [inline]
 ccid3_hc_rx_packet_recv+0x94c/0xe90 net/dccp/ccids/ccid3.c:788
 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
 dccp_deliver_input_to_ccids+0xe1/0x260 net/dccp/input.c:176
 dccp_rcv_established net/dccp/input.c:374 [inline]
 dccp_rcv_established+0x107/0x160 net/dccp/input.c:364
 dccp_v4_do_rcv+0x130/0x1a0 net/dccp/ipv4.c:667
 sk_backlog_rcv include/net/sock.h:1051 [inline]
 __release_sock+0x134/0x3b0 net/core/sock.c:2814
 release_sock+0x54/0x1b0 net/core/sock.c:3347
 dccp_sendmsg+0x67f/0xc90 net/dccp/proto.c:785
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 ____sys_sendmsg+0x32b/0x800 net/socket.c:2413
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467
 __sys_sendmmsg+0x195/0x470 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
 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: 0033:0x7f0957e890e9
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:00007f0958f02168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0957f9bf60 RCX: 00007f0957e890e9
RDX: 0000000000000002 RSI: 0000000020007c40 RDI: 0000000000000004
RBP: 00007f0957ee308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe1c38e36f R14: 00007f0958f02300 R15: 0000000000022000
 </TASK>