BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:414/tfrc_rx_hist_sample_rtt() CPU: 1 PID: 26443 Comm: syz-executor.3 Not tainted 6.6.0-rc2-syzkaller-00716-gfbff653a40f6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 tfrc_rx_hist_sample_rtt+0x3db/0x4a0 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x844/0xf10 net/dccp/ccids/ccid3.c:760 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xe3/0x260 net/dccp/input.c:176 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x106/0x160 net/dccp/input.c:364 dccp_v4_do_rcv+0x169/0x1a0 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1121 [inline] __sk_receive_skb+0x2a8/0xba0 net/core/sock.c:571 dccp_v4_rcv+0x1282/0x1a00 net/dccp/ipv4.c:898 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:304 [inline] NF_HOOK include/linux/netfilter.h:298 [inline] ip_local_deliver+0x1b6/0x550 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x1c4/0x2e0 net/ipv4/ip_input.c:449 NF_HOOK include/linux/netfilter.h:304 [inline] NF_HOOK include/linux/netfilter.h:298 [inline] ip_rcv+0xc9/0x430 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5523 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5637 process_backlog+0x101/0x6b0 net/core/dev.c:5965 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6527 napi_poll net/core/dev.c:6594 [inline] net_rx_action+0x956/0xe90 net/core/dev.c:6727 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x47/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0033:0x7fb052838781 Code: 2c 24 4c 8d 35 a0 78 15 00 48 89 fb 48 89 74 24 10 48 89 54 24 18 eb 20 90 4c 89 ff e8 a8 09 ff ff 41 08 c5 0f 85 ff 01 00 00 <41> 83 c4 01 44 3b 63 04 0f 83 c9 00 00 00 48 8b 34 24 44 89 e1 48 RSP: 002b:00007ffeda1b31c0 EFLAGS: 00000246 RAX: 00000000813a3db6 RBX: 00007fb05299c018 RCX: 000000000000315a RDX: 00000000813a3db6 RSI: 0000000080000000 RDI: 000000000001b783 RBP: 00000000813a3db6 R08: 0000001b31220000 R09: 0000000000001db6 R10: 00000000813a3dba R11: 0000000000000246 R12: 000000000000315a R13: 0000000000000001 R14: 00007fb052990000 R15: ffffffff813a3c01