BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:417/tfrc_rx_hist_sample_rtt() CPU: 1 PID: 3600 Comm: syz-executor391 Not tainted 5.15.104-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 tfrc_rx_hist_sample_rtt+0x370/0x460 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x636/0xd50 net/dccp/ccids/ccid3.c:760 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids net/dccp/input.c:176 [inline] dccp_rcv_established+0x1b3/0x310 net/dccp/input.c:374 dccp_v4_do_rcv+0xcd/0x190 net/dccp/ipv4.c:669 sk_backlog_rcv include/net/sock.h:1057 [inline] __sk_receive_skb+0x416/0x9c0 net/core/sock.c:528 ip_protocol_deliver_rcu+0x381/0x730 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1db/0x320 net/ipv4/ip_input.c:231 NF_HOOK+0x364/0x410 include/linux/netfilter.h:307 NF_HOOK+0x364/0x410 include/linux/netfilter.h:307 __netif_receive_skb_one_core net/core/dev.c:5458 [inline] __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5572 process_backlog+0x363/0x7f0 net/core/dev.c:6449 __napi_poll+0xc7/0x440 net/core/dev.c:7008 napi_poll net/core/dev.c:7075 [inline] net_rx_action+0x617/0xda0 net/core/dev.c:7162 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 do_softirq+0x162/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b1/0x1f0 kernel/softirq.c:383 rcu_read_unlock_bh include/linux/rcupdate.h:766 [inline] ip_finish_output2+0xece/0x1270 net/ipv4/ip_output.c:229 dst_output include/net/dst.h:449 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x1296/0x1ce0 net/ipv4/ip_output.c:532 dccp_transmit_skb+0xc29/0x1030 net/dccp/output.c:138 dccp_xmit_packet+0x2ef/0x530 net/dccp/output.c:281 dccp_write_xmit+0x131/0x220 net/dccp/output.c:366 dccp_sendmsg+0x69c/0xa30 net/dccp/proto.c:794 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff5d6020399 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 16 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdcde4e4f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff5d6020399 RDX: 000000000c004004 RSI: 0000000020004340 RDI: 0000000000000005 RBP: 0000000000000000 R08: 00007ffdcde4e520 R09: 00007ffdcde4e520 R10: 00007ffdcde4e520 R11: 0000000000000246 R12: 00007ffdcde4e518 R13: 00007ffdcde4e530 R14: 00007ffdcde4e570 R15: 0000000000000000