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: 31101 Comm: syz-executor.0 Not tainted 6.1.82-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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+0x38f/0x4a0 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x6aa/0xf40 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+0xfb/0x1e0 net/dccp/ipv4.c:674 sk_backlog_rcv include/net/sock.h:1117 [inline] __sk_receive_skb+0x41a/0x9d0 net/core/sock.c:568 ip_protocol_deliver_rcu+0x381/0x740 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2b4/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x39d/0x450 include/linux/netfilter.h:302 NF_HOOK+0x39d/0x450 include/linux/netfilter.h:302 __netif_receive_skb_one_core net/core/dev.c:5528 [inline] __netif_receive_skb+0x1c6/0x530 net/core/dev.c:5642 process_backlog+0x381/0x760 net/core/dev.c:5970 __napi_poll+0xc7/0x470 net/core/dev.c:6537 napi_poll net/core/dev.c:6604 [inline] net_rx_action+0x70f/0xeb0 net/core/dev.c:6715 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 RIP: 0033:0x7f41f5a39bc4 Code: 4d 00 49 8b 55 f8 49 8d 45 f8 48 39 d1 0f 83 e5 00 00 00 0f 1f 00 48 89 50 08 48 89 c6 48 8b 50 f8 48 83 e8 08 48 39 d1 72 ec <49> 83 c5 08 48 89 0e 4c 39 eb 75 c8 48 89 ea eb 0d 0f 1f 00 48 8b RSP: 002b:00007ffe435d4d90 EFLAGS: 00000246 RAX: 00007f41f540a698 RBX: 00007f41f540b258 RCX: ffffffff89cacb5e RDX: ffffffff89cacb5e RSI: 00007f41f540a6a0 RDI: 00007f41f5400008 RBP: 00007f41f5400008 R08: 00007f41f5400060 R09: 00000000000000f0 R10: 000000008132978d R11: 0000000000000246 R12: 0000001b2e928754 R13: 00007f41f540a6e0 R14: 00007f41f5ba0000 R15: 00007f41f5bac018