ccid3_first_li: No RTT estimate available, using fallback RTT ccid3_first_li: X_recv==0 BUG: stored value of X_recv is zero at net/dccp/ccids/ccid3.c:691/ccid3_first_li() CPU: 1 PID: 6581 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 ccid3_first_li+0x354/0x3c0 net/dccp/ccids/ccid3.c:691 tfrc_lh_interval_add+0x4a4/0x694 net/dccp/ccids/lib/loss_interval.c:157 tfrc_rx_handle_loss+0x564/0x14e0 net/dccp/ccids/lib/packet_history.c:328 ccid3_hc_rx_packet_recv+0x2bc/0xc98 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+0x1ac/0x2d8 net/dccp/input.c:374 dccp_v4_do_rcv+0xe8/0x1d4 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1121 [inline] __sk_receive_skb+0x3e4/0x8ec net/core/sock.c:571 dccp_v4_rcv+0xf68/0x14f8 net/dccp/ipv4.c:898 ip_protocol_deliver_rcu+0x1f8/0x47c net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x23c/0x46c net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x224/0x250 net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5552 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5666 process_backlog+0x3c0/0x70c net/core/dev.c:5994 __napi_poll+0xb4/0x648 net/core/dev.c:6556 napi_poll net/core/dev.c:6623 [inline] net_rx_action+0x5e4/0xdc4 net/core/dev.c:6756 __do_softirq+0x2d0/0xd54 kernel/softirq.c:553 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:886 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 do_softirq+0xb8/0x170 kernel/softirq.c:454 __local_bh_enable_ip+0x2b0/0x4ac kernel/softirq.c:381 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33 rcu_read_unlock_bh include/linux/rcupdate.h:819 [inline] __dev_queue_xmit+0x182c/0x32c0 net/core/dev.c:4396 dev_queue_xmit include/linux/netdevice.h:3082 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0xdc4/0x1394 net/ipv4/ip_output.c:233 __ip_finish_output+0x1b0/0x458 ip_finish_output+0x44/0x2e4 net/ipv4/ip_output.c:321 NF_HOOK_COND include/linux/netfilter.h:293 [inline] ip_output+0x1a8/0x21c net/ipv4/ip_output.c:431 dst_output include/net/dst.h:458 [inline] ip_local_out net/ipv4/ip_output.c:127 [inline] __ip_queue_xmit+0xdd8/0x1874 net/ipv4/ip_output.c:533 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:547 dccp_transmit_skb+0xbd4/0x11dc net/dccp/output.c:138 dccp_send_sync+0x154/0x20c net/dccp/output.c:666 __dccp_rcv_established+0x27c/0x4a8 net/dccp/input.c:346 dccp_rcv_established+0x288/0x2d8 net/dccp/input.c:376 dccp_v4_do_rcv+0xe8/0x1d4 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1121 [inline] __release_sock+0x1a8/0x408 net/core/sock.c:2983 release_sock+0x68/0x1b0 net/core/sock.c:3520 dccp_sendmsg+0x448/0xae8 net/dccp/proto.c:803 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:846 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2558 ___sys_sendmsg net/socket.c:2612 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2698 __do_sys_sendmmsg net/socket.c:2727 [inline] __se_sys_sendmmsg net/socket.c:2724 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2724 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 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: 6924 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 tfrc_rx_hist_sample_rtt+0x34c/0x444 net/dccp/ccids/lib/packet_history.c:414 ccid3_hc_rx_packet_recv+0x554/0xc98 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+0xe8/0x1d4 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1121 [inline] __sk_receive_skb+0x3e4/0x8ec net/core/sock.c:571 dccp_v4_rcv+0xf68/0x14f8 net/dccp/ipv4.c:898 ip_protocol_deliver_rcu+0x1f8/0x47c net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x23c/0x46c net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x224/0x250 net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5552 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5666 process_backlog+0x3c0/0x70c net/core/dev.c:5994 __napi_poll+0xb4/0x648 net/core/dev.c:6556 napi_poll net/core/dev.c:6623 [inline] net_rx_action+0x5e4/0xdc4 net/core/dev.c:6756 __do_softirq+0x2d0/0xd54 kernel/softirq.c:553 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:886 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:434 [inline] __irq_exit_rcu+0x200/0x494 kernel/softirq.c:632 irq_exit_rcu+0x14/0x84 kernel/softirq.c:644 __el1_irq arch/arm64/kernel/entry-common.c:503 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:517 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:522 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:591 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:176 [inline] arch_local_irq_restore arch/arm64/include/asm/irqflags.h:196 [inline] lock_acquire+0x278/0x71c kernel/locking/lockdep.c:5756 __might_fault+0xc4/0x124 mm/memory.c:5896 _copy_from_user include/linux/uaccess.h:146 [inline] copy_from_user include/linux/uaccess.h:183 [inline] copy_msghdr_from_user+0xb4/0x59c net/socket.c:2488 sendmsg_copy_msghdr net/socket.c:2589 [inline] ___sys_sendmsg net/socket.c:2608 [inline] __sys_sendmmsg+0x2e0/0x7d8 net/socket.c:2698 __do_sys_sendmmsg net/socket.c:2727 [inline] __se_sys_sendmmsg net/socket.c:2724 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2724 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values() BUG: stored value of X_recv is zero at net/dccp/ccids/ccid3.c:691/ccid3_first_li() CPU: 1 PID: 7036 Comm: syz-executor.0 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 ccid3_first_li+0x354/0x3c0 net/dccp/ccids/ccid3.c:691 tfrc_lh_interval_add+0x4a4/0x694 net/dccp/ccids/lib/loss_interval.c:157 tfrc_rx_handle_loss+0x564/0x14e0 net/dccp/ccids/lib/packet_history.c:328 ccid3_hc_rx_packet_recv+0x2bc/0xc98 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+0x1ac/0x2d8 net/dccp/input.c:374 dccp_v4_do_rcv+0xe8/0x1d4 net/dccp/ipv4.c:675 sk_backlog_rcv include/net/sock.h:1121 [inline] __sk_receive_skb+0x3e4/0x8ec net/core/sock.c:571 dccp_v4_rcv+0xf68/0x14f8 net/dccp/ipv4.c:898 ip_protocol_deliver_rcu+0x1f8/0x47c net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x23c/0x46c net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x224/0x250 net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:304 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5552 [inline] __netif_receive_skb+0x18c/0x400 net/core/dev.c:5666 process_backlog+0x3c0/0x70c net/core/dev.c:5994 __napi_poll+0xb4/0x648 net/core/dev.c:6556 napi_poll net/core/dev.c:6623 [inline] net_rx_action+0x5e4/0xdc4 net/core/dev.c:6756 __do_softirq+0x2d0/0xd54 kernel/softirq.c:553 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:886 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:434 [inline] __irq_exit_rcu+0x200/0x494 kernel/softirq.c:632 irq_exit_rcu+0x14/0x84 kernel/softirq.c:644 __el1_irq arch/arm64/kernel/entry-common.c:503 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:517 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:522 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:591 qlist_free_all+0x3c/0xcc mm/kasan/quarantine.c:183 kasan_quarantine_reduce+0x118/0x124 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x2c/0x8c mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x90/0x4a0 mm/slab.h:762 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x2c8/0x46c mm/slub.c:3523 __alloc_skb+0x19c/0x3d8 net/core/skbuff.c:640 alloc_skb include/linux/skbuff.h:1286 [inline] alloc_skb_with_frags+0xc8/0x5c0 net/core/skbuff.c:6313 sock_alloc_send_pskb+0x76c/0x884 net/core/sock.c:2795 sock_alloc_send_skb include/net/sock.h:1883 [inline] dccp_sendmsg+0x34c/0xae8 net/dccp/proto.c:764 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:846 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2558 ___sys_sendmsg net/socket.c:2612 [inline] __sys_sendmmsg+0x318/0x7d8 net/socket.c:2698 __do_sys_sendmmsg net/socket.c:2727 [inline] __se_sys_sendmmsg net/socket.c:2724 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2724 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595