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 UID: 0 PID: 6952 Comm: syz-executor.0 Not tainted 6.12.0-rc6-syzkaller-00200-g563047e691f2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 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+0xe8/0x1d8 net/dccp/ipv4.c:680 sk_backlog_rcv include/net/sock.h:1115 [inline] __sk_receive_skb+0x3e8/0x8c0 net/core/sock.c:570 dccp_v4_rcv+0xf68/0x146c net/dccp/ipv4.c:903 ip_protocol_deliver_rcu+0x1f8/0x484 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x284/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5783 process_backlog+0x640/0x123c net/core/dev.c:6115 __napi_poll+0xb4/0x3fc net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:6970 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:637 irq_exit_rcu+0x14/0x84 kernel/softirq.c:649 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:194 (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] (L) _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 (L) spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] skb_queue_tail+0xe8/0x124 net/core/skbuff.c:4034 qpolicy_simple_push+0x28/0x38 net/dccp/qpolicy.c:17 dccp_qpolicy_push+0x90/0xc8 net/dccp/qpolicy.c:97 dccp_sendmsg+0x5f4/0xb08 net/dccp/proto.c:794 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2607 ___sys_sendmsg net/socket.c:2661 [inline] __sys_sendmmsg+0x318/0x7e0 net/socket.c:2747 __do_sys_sendmmsg net/socket.c:2776 [inline] __se_sys_sendmmsg net/socket.c:2773 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2773 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 BUG: stored value of X_recv is zero at net/dccp/ccids/ccid3.c:691/ccid3_first_li() CPU: 0 UID: 0 PID: 7042 Comm: syz-executor.0 Not tainted 6.12.0-rc6-syzkaller-00200-g563047e691f2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 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+0xe8/0x1d8 net/dccp/ipv4.c:680 sk_backlog_rcv include/net/sock.h:1115 [inline] __sk_receive_skb+0x3e8/0x8c0 net/core/sock.c:570 dccp_v4_rcv+0xf68/0x146c net/dccp/ipv4.c:903 ip_protocol_deliver_rcu+0x1f8/0x484 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x284/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5783 process_backlog+0x640/0x123c net/core/dev.c:6115 __napi_poll+0xb4/0x3fc net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:6970 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 do_softirq+0x90/0xf8 kernel/softirq.c:455 __local_bh_enable_ip+0x288/0x44c kernel/softirq.c:382 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:33 rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x1814/0x3548 net/core/dev.c:4459 dev_queue_xmit include/linux/netdevice.h:3094 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0xda4/0x1384 net/ipv4/ip_output.c:236 __ip_finish_output+0x1b0/0x45c ip_finish_output+0x44/0x2e8 net/ipv4/ip_output.c:324 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x1a8/0x21c net/ipv4/ip_output.c:434 dst_output include/net/dst.h:450 [inline] ip_local_out net/ipv4/ip_output.c:130 [inline] __ip_queue_xmit+0xe10/0x1878 net/ipv4/ip_output.c:536 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:550 dccp_transmit_skb+0xbd8/0x11e0 net/dccp/output.c:138 dccp_send_ack+0x140/0x2bc net/dccp/output.c:600 ccid3_hc_rx_send_feedback net/dccp/ccids/ccid3.c:635 [inline] ccid3_hc_rx_packet_recv+0x4d0/0xc98 net/dccp/ccids/ccid3.c:788 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+0xe8/0x1d8 net/dccp/ipv4.c:680 sk_backlog_rcv include/net/sock.h:1115 [inline] __release_sock+0x1a8/0x3d8 net/core/sock.c:3072 release_sock+0x68/0x1b8 net/core/sock.c:3626 dccp_sendmsg+0x460/0xb08 net/dccp/proto.c:803 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2607 ___sys_sendmsg net/socket.c:2661 [inline] __sys_sendmmsg+0x318/0x7e0 net/socket.c:2747 __do_sys_sendmmsg net/socket.c:2776 [inline] __se_sys_sendmmsg net/socket.c:2773 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2773 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values() 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 UID: 0 PID: 7116 Comm: syz-executor.0 Not tainted 6.12.0-rc6-syzkaller-00200-g563047e691f2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 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+0xe8/0x1d8 net/dccp/ipv4.c:680 sk_backlog_rcv include/net/sock.h:1115 [inline] __sk_receive_skb+0x3e8/0x8c0 net/core/sock.c:570 dccp_v4_rcv+0xf68/0x146c net/dccp/ipv4.c:903 ip_protocol_deliver_rcu+0x1f8/0x484 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x284/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5783 process_backlog+0x640/0x123c net/core/dev.c:6115 __napi_poll+0xb4/0x3fc net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:6970 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:637 irq_exit_rcu+0x14/0x84 kernel/softirq.c:649 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) kasan_quarantine_put+0xb8/0x1c8 mm/kasan/quarantine.c:234 (P) kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 (L) __kasan_slab_free+0x70/0x8c mm/kasan/common.c:271 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x184/0x47c mm/slub.c:4727 skb_kfree_head net/core/skbuff.c:1086 [inline] skb_free_head+0xf4/0x1bc net/core/skbuff.c:1098 skb_release_data+0x484/0x618 net/core/skbuff.c:1125 skb_release_all net/core/skbuff.c:1190 [inline] __kfree_skb net/core/skbuff.c:1204 [inline] sk_skb_reason_drop+0x1d4/0x43c net/core/skbuff.c:1242 kfree_skb_reason include/linux/skbuff.h:1262 [inline] kfree_skb include/linux/skbuff.h:1271 [inline] dccp_qpolicy_drop+0x40/0x58 net/dccp/qpolicy.c:109 dccp_write_xmit+0x144/0x208 net/dccp/output.c:369 dccp_sendmsg+0x628/0xb08 net/dccp/proto.c:801 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2607 ___sys_sendmsg net/socket.c:2661 [inline] __sys_sendmmsg+0x318/0x7e0 net/socket.c:2747 __do_sys_sendmmsg net/socket.c:2776 [inline] __se_sys_sendmmsg net/socket.c:2773 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2773 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values() 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: 0 UID: 0 PID: 7232 Comm: syz-executor.0 Not tainted 6.12.0-rc6-syzkaller-00200-g563047e691f2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 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+0xe8/0x1d8 net/dccp/ipv4.c:680 sk_backlog_rcv include/net/sock.h:1115 [inline] __sk_receive_skb+0x3e8/0x8c0 net/core/sock.c:570 dccp_v4_rcv+0xf68/0x146c net/dccp/ipv4.c:903 ip_protocol_deliver_rcu+0x1f8/0x484 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x284/0x4f0 net/ipv4/ip_input.c:233 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish+0x220/0x24c net/ipv4/ip_input.c:449 NF_HOOK+0x328/0x3d4 include/linux/netfilter.h:314 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:569 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5783 process_backlog+0x640/0x123c net/core/dev.c:6115 __napi_poll+0xb4/0x3fc net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:6970 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x1d8/0x434 kernel/softirq.c:637 irq_exit_rcu+0x14/0x84 kernel/softirq.c:649 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x27c/0x728 kernel/locking/lockdep.c:5828 (P) lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline] (L) lock_acquire+0x24c/0x728 kernel/locking/lockdep.c:5827 (L) rcu_lock_acquire+0x44/0x54 include/linux/rcupdate.h:337 rcu_read_lock include/linux/rcupdate.h:849 [inline] count_memcg_events_mm include/linux/memcontrol.h:1042 [inline] count_memcg_event_mm+0x34/0x2c8 include/linux/memcontrol.h:1052 mm_account_fault mm/memory.c:5943 [inline] handle_mm_fault+0x430/0x8b4 mm/memory.c:6103 do_page_fault+0x570/0x10a8 arch/arm64/mm/fault.c:690 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:919 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:432 el1h_64_sync_handler+0x60/0xcc arch/arm64/kernel/entry-common.c:510 el1h_64_sync+0x6c/0x70 arch/arm64/kernel/entry.S:595 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:169 [inline] (P) __sys_sendmmsg+0x4c8/0x7e0 net/socket.c:2752 (P) access_ok arch/arm64/include/asm/uaccess.h:45 [inline] (L) __sys_sendmmsg+0x490/0x7e0 net/socket.c:2752 (L) __do_sys_sendmmsg net/socket.c:2776 [inline] __se_sys_sendmmsg net/socket.c:2773 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2773 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Negotiation of local Allow Short Seqnos failed in state CHANGING at net/dccp/feat.c:1537/dccp_feat_activate_values()