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: 4545 Comm: syz-executor.0 Not tainted 5.15.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 tfrc_rx_hist_sample_rtt+0x318/0x3ec net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x51c/0xb24 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+0xa8/0x184 net/dccp/ipv4.c:672
 sk_backlog_rcv include/net/sock.h:1061 [inline]
 __sk_receive_skb+0x3c0/0x8bc net/core/sock.c:526
 dccp_v4_rcv+0xe80/0x143c net/dccp/ipv4.c:895
 ip_protocol_deliver_rcu+0x370/0x778 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:462 [inline]
 ip_rcv_finish+0x228/0x260 net/ipv4/ip_input.c:447
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:566
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:459
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:383
 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229
 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x314/0x414 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:452 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546
 dccp_transmit_skb+0xa24/0xdc4 net/dccp/output.c:138
 dccp_xmit_packet+0x234/0x448 net/dccp/output.c:281
 dccp_write_xmit+0x118/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x538/0x8a8 net/dccp/proto.c:810
 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x61c/0x920 net/socket.c:2436
 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526
 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
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: 4608 Comm: syz-executor.5 Not tainted 5.15.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 tfrc_rx_hist_sample_rtt+0x318/0x3ec net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x51c/0xb24 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+0xa8/0x184 net/dccp/ipv4.c:672
 sk_backlog_rcv include/net/sock.h:1061 [inline]
 __sk_receive_skb+0x3c0/0x8bc net/core/sock.c:526
 dccp_v4_rcv+0xe80/0x143c net/dccp/ipv4.c:895
 ip_protocol_deliver_rcu+0x370/0x778 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:462 [inline]
 ip_rcv_finish+0x228/0x260 net/ipv4/ip_input.c:447
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:566
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:459
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:383
 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229
 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x314/0x414 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:452 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546
 dccp_transmit_skb+0xa24/0xdc4 net/dccp/output.c:138
 dccp_xmit_packet+0x234/0x448 net/dccp/output.c:281
 dccp_write_xmit+0x118/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x538/0x8a8 net/dccp/proto.c:810
 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x61c/0x920 net/socket.c:2436
 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526
 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
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: 4617 Comm: syz-executor.4 Not tainted 5.15.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 tfrc_rx_hist_sample_rtt+0x318/0x3ec net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x51c/0xb24 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+0xa8/0x184 net/dccp/ipv4.c:672
 sk_backlog_rcv include/net/sock.h:1061 [inline]
 __sk_receive_skb+0x3c0/0x8bc net/core/sock.c:526
 dccp_v4_rcv+0xe80/0x143c net/dccp/ipv4.c:895
 ip_protocol_deliver_rcu+0x370/0x778 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_local_deliver+0x120/0x194 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:462 [inline]
 ip_rcv_finish+0x228/0x260 net/ipv4/ip_input.c:447
 NF_HOOK+0x2c0/0x354 include/linux/netfilter.h:302
 ip_rcv+0x7c/0x9c net/ipv4/ip_input.c:566
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x2ac net/core/dev.c:5639
 process_backlog+0x3c8/0x744 net/core/dev.c:6516
 __napi_poll+0xb4/0x5dc net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x468/0xa08 net/core/dev.c:7232
 handle_softirqs+0x344/0xbf0 kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:459
 __local_bh_enable_ip+0x250/0x380 kernel/softirq.c:383
 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip_finish_output2+0xe8c/0x1228 net/ipv4/ip_output.c:229
 __ip_finish_output+0x1b0/0x448 net/ipv4/ip_output.c:-1
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x314/0x414 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:452 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xe00/0x18f0 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x7c net/ipv4/ip_output.c:546
 dccp_transmit_skb+0xa24/0xdc4 net/dccp/output.c:138
 dccp_xmit_packet+0x234/0x448 net/dccp/output.c:281
 dccp_write_xmit+0x118/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x538/0x8a8 net/dccp/proto.c:810
 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:834
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x61c/0x920 net/socket.c:2436
 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526
 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584