BUG: stored value of X_recv is zero at net/dccp/ccids/ccid3.c:691/ccid3_first_li() CPU: 0 PID: 3117 Comm: syz-executor214 Not tainted 6.0.0-rc6-syzkaller-17715-g5aa266bb455b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 ccid3_first_li+0x274/0x280 net/dccp/ccids/ccid3.c:691 tfrc_lh_interval_add+0x280/0x444 net/dccp/ccids/lib/loss_interval.c:157 tfrc_rx_handle_loss+0x23c/0x920 net/dccp/ccids/lib/packet_history.c:328 ccid3_hc_rx_packet_recv+0x17c/0x4b8 net/dccp/ccids/ccid3.c:744 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+0x120/0x1a4 net/dccp/input.c:374 dccp_v4_do_rcv+0x58/0xd0 net/dccp/ipv4.c:666 sk_backlog_rcv include/net/sock.h:1100 [inline] __sk_receive_skb+0x2a4/0x494 net/core/sock.c:565 dccp_v4_rcv+0x964/0xc5c net/dccp/ipv4.c:889 ip_protocol_deliver_rcu+0x224/0x414 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x124/0x1d8 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0xd0/0xf4 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x16c/0x190 net/ipv4/ip_input.c:444 NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0x80/0xb0 net/ipv4/ip_input.c:564 __netif_receive_skb_one_core net/core/dev.c:5485 [inline] __netif_receive_skb+0x70/0x14c net/core/dev.c:5599 process_backlog+0x23c/0x384 net/core/dev.c:5927 __napi_poll+0x5c/0x24c net/core/dev.c:6511 napi_poll+0x110/0x484 net/core/dev.c:6578 net_rx_action+0x18c/0x40c net/core/dev.c:6689 _stext+0x168/0x37c ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x54 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84 invoke_softirq+0x70/0xbc kernel/softirq.c:452 __irq_exit_rcu+0xf0/0x140 kernel/softirq.c:650 irq_exit_rcu+0x10/0x40 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:471 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:485 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:490 el1h_64_irq+0x64/0x68 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] ktime_get_with_offset+0x14c/0x218 kernel/time/timekeeping.c:889 ktime_get_real include/linux/timekeeping.h:79 [inline] ccid3_hc_tx_send_packet+0x38/0x3b8 net/dccp/ccids/ccid3.c:276 ccid_hc_tx_send_packet net/dccp/ccid.h:167 [inline] dccp_write_xmit+0x50/0x148 net/dccp/output.c:356 dccp_sendmsg+0x2d0/0x300 net/dccp/proto.c:783 inet_sendmsg+0xb0/0x118 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x308/0x450 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmmsg+0x228/0x594 net/socket.c:2622 __do_sys_sendmmsg net/socket.c:2651 [inline] __se_sys_sendmmsg net/socket.c:2648 [inline] __arm64_sys_sendmmsg+0x30/0x44 net/socket.c:2648 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values() Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values()