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: 4134 Comm: syz-executor.4 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x39e/0x4c0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x6a7/0xf50 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/0x310 net/dccp/input.c:374
 dccp_v4_do_rcv+0xf1/0x1e0 net/dccp/ipv4.c:677
 sk_backlog_rcv include/net/sock.h:1119 [inline]
 __sk_receive_skb+0x432/0x980 net/core/sock.c:569
 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5683
 process_backlog+0x37c/0x6e0 net/core/dev.c:6011
 __napi_poll+0xc0/0x460 net/core/dev.c:6578
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6759
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 do_softirq+0x13b/0x200 kernel/softirq.c:497
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:421
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x15c9/0x3760 net/core/dev.c:4361
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:528 [inline]
 neigh_output include/net/neighbour.h:542 [inline]
 ip_finish_output2+0xcfd/0x11b0 net/ipv4/ip_output.c:228
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x1030/0x19b0 net/ipv4/ip_output.c:532
 dccp_transmit_skb+0xcd5/0x1340 net/dccp/output.c:138
 dccp_xmit_packet+0x356/0x5f0 net/dccp/output.c:281
 dccp_write_xmit+0x120/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x62c/0x900 net/dccp/proto.c:798
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x592/0x8f0 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f18e327c959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18e3eff0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f18e339bf80 RCX: 00007f18e327c959
RDX: 000000000c004004 RSI: 0000000020004340 RDI: 0000000000000005
RBP: 00007f18e32d8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f18e339bf80 R15: 00007ffc05b9a458
 </TASK>
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: 4153 Comm: syz-executor.4 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x39e/0x4c0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x6a7/0xf50 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/0x310 net/dccp/input.c:374
 dccp_v4_do_rcv+0xf1/0x1e0 net/dccp/ipv4.c:677
 sk_backlog_rcv include/net/sock.h:1119 [inline]
 __sk_receive_skb+0x432/0x980 net/core/sock.c:569
 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5683
 process_backlog+0x37c/0x6e0 net/core/dev.c:6011
 __napi_poll+0xc0/0x460 net/core/dev.c:6578
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6759
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 do_softirq+0x13b/0x200 kernel/softirq.c:497
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:421
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x15c9/0x3760 net/core/dev.c:4361
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:528 [inline]
 neigh_output include/net/neighbour.h:542 [inline]
 ip_finish_output2+0xcfd/0x11b0 net/ipv4/ip_output.c:228
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x1030/0x19b0 net/ipv4/ip_output.c:532
 dccp_transmit_skb+0xcd5/0x1340 net/dccp/output.c:138
 dccp_xmit_packet+0x356/0x5f0 net/dccp/output.c:281
 dccp_write_xmit+0x120/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x62c/0x900 net/dccp/proto.c:798
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x592/0x8f0 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f18e327c959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f18e3eff0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f18e339bf80 RCX: 00007f18e327c959
RDX: 000000000c004004 RSI: 0000000020004340 RDI: 0000000000000005
RBP: 00007f18e32d8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f18e339bf80 R15: 00007ffc05b9a458
 </TASK>
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: 4161 Comm: syz-executor.0 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x39e/0x4c0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x6a7/0xf50 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/0x310 net/dccp/input.c:374
 dccp_v4_do_rcv+0xf1/0x1e0 net/dccp/ipv4.c:677
 sk_backlog_rcv include/net/sock.h:1119 [inline]
 __sk_receive_skb+0x432/0x980 net/core/sock.c:569
 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5683
 process_backlog+0x37c/0x6e0 net/core/dev.c:6011
 __napi_poll+0xc0/0x460 net/core/dev.c:6578
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6759
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 do_softirq+0x13b/0x200 kernel/softirq.c:497
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:421
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x15c9/0x3760 net/core/dev.c:4361
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:528 [inline]
 neigh_output include/net/neighbour.h:542 [inline]
 ip_finish_output2+0xcfd/0x11b0 net/ipv4/ip_output.c:228
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x1030/0x19b0 net/ipv4/ip_output.c:532
 dccp_transmit_skb+0xcd5/0x1340 net/dccp/output.c:138
 dccp_xmit_packet+0x356/0x5f0 net/dccp/output.c:281
 dccp_write_xmit+0x120/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x62c/0x900 net/dccp/proto.c:798
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x592/0x8f0 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fae7b67c959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae7c3a30c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fae7b79bf80 RCX: 00007fae7b67c959
RDX: 000000000c004004 RSI: 0000000020004340 RDI: 0000000000000005
RBP: 00007fae7b6d8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fae7b79bf80 R15: 00007ffc695ee588
 </TASK>
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: 4169 Comm: syz-executor.0 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x39e/0x4c0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x6a7/0xf50 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/0x310 net/dccp/input.c:374
 dccp_v4_do_rcv+0xf1/0x1e0 net/dccp/ipv4.c:677
 sk_backlog_rcv include/net/sock.h:1119 [inline]
 __sk_receive_skb+0x432/0x980 net/core/sock.c:569
 ip_protocol_deliver_rcu+0x3ad/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2c7/0x510 net/ipv4/ip_input.c:233
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 NF_HOOK+0x2ff/0x390 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5569 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5683
 process_backlog+0x37c/0x6e0 net/core/dev.c:6011
 __napi_poll+0xc0/0x460 net/core/dev.c:6578
 napi_poll net/core/dev.c:6645 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6759
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 do_softirq+0x13b/0x200 kernel/softirq.c:497
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x174/0x1b0 kernel/softirq.c:421
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:861 [inline]
 __dev_queue_xmit+0x15c9/0x3760 net/core/dev.c:4361
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 neigh_hh_output include/net/neighbour.h:528 [inline]
 neigh_output include/net/neighbour.h:542 [inline]
 ip_finish_output2+0xcfd/0x11b0 net/ipv4/ip_output.c:228
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x1030/0x19b0 net/ipv4/ip_output.c:532
 dccp_transmit_skb+0xcd5/0x1340 net/dccp/output.c:138
 dccp_xmit_packet+0x356/0x5f0 net/dccp/output.c:281
 dccp_write_xmit+0x120/0x1d0 net/dccp/output.c:366
 dccp_sendmsg+0x62c/0x900 net/dccp/proto.c:798
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x592/0x8f0 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fae7b67c959
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae7c3a30c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fae7b79bf80 RCX: 00007fae7b67c959
RDX: 000000000c004004 RSI: 0000000020004340 RDI: 0000000000000005
RBP: 00007fae7b6d8c88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fae7b79bf80 R15: 00007ffc695ee588
 </TASK>