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: 0 PID: 6459 Comm: syz-executor.0 Not tainted 5.15.105-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 tfrc_rx_hist_sample_rtt+0x31c/0x3f0 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x4e4/0xaf8 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+0x1ac/0x2d8 net/dccp/input.c:374 dccp_v4_do_rcv+0xa8/0x188 net/dccp/ipv4.c:669 sk_backlog_rcv include/net/sock.h:1057 [inline] __sk_receive_skb+0x3f0/0x960 net/core/sock.c:528 dccp_v4_rcv+0xec4/0x1458 net/dccp/ipv4.c:892 ip_protocol_deliver_rcu+0x36c/0x770 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:307 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:459 [inline] ip_rcv_finish+0x22c/0x264 net/ipv4/ip_input.c:447 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:307 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:566 __netif_receive_skb_one_core net/core/dev.c:5458 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5572 process_backlog+0x3ec/0x7e0 net/core/dev.c:6449 __napi_poll+0xb4/0x624 net/core/dev.c:7008 napi_poll net/core/dev.c:7075 [inline] net_rx_action+0x500/0xc10 net/core/dev.c:7162 __do_softirq+0x344/0xe20 kernel/softirq.c:558 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] invoke_softirq kernel/softirq.c:439 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636 irq_exit+0x14/0x88 kernel/softirq.c:660 handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710 gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:757 call_on_irq_stack+0x2c/0x54 arch/arm64/kernel/entry.S:899 do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267 el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0xbc/0x158 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] __wake_up_common_lock kernel/sched/wait.c:140 [inline] __wake_up_sync_key+0x124/0x1ac kernel/sched/wait.c:205 __unix_dgram_recvmsg+0x4c4/0xe64 net/unix/af_unix.c:2344 unix_dgram_recvmsg+0xd4/0xec net/unix/af_unix.c:2415 ____sys_recvmsg+0x234/0x720 ___sys_recvmsg+0x240/0x2cc net/socket.c:2673 do_recvmmsg+0x310/0x9a4 net/socket.c:2767 __sys_recvmmsg net/socket.c:2846 [inline] __do_sys_recvmmsg net/socket.c:2869 [inline] __se_sys_recvmmsg net/socket.c:2862 [inline] __arm64_sys_recvmmsg+0x180/0x23c net/socket.c:2862 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584