BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:414/tfrc_rx_hist_sample_rtt()
CPU: 0 PID: 5064 Comm: sshd Not tainted 6.7.0-syzkaller-01727-gab27740f7665 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
 tfrc_rx_hist_sample_rtt+0x3dd/0x4a0 net/dccp/ccids/lib/packet_history.c:414
 ccid3_hc_rx_packet_recv+0x443/0xf50 net/dccp/ccids/ccid3.c:760
 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline]
 dccp_deliver_input_to_ccids+0xe3/0x260 net/dccp/input.c:176
 dccp_rcv_established net/dccp/input.c:374 [inline]
 dccp_rcv_established+0x106/0x160 net/dccp/input.c:364
 dccp_v4_do_rcv+0x169/0x1b0 net/dccp/ipv4.c:675
 sk_backlog_rcv include/net/sock.h:1121 [inline]
 __sk_receive_skb+0x2af/0x840 net/core/sock.c:571
 dccp_v4_rcv+0x128a/0x1980 net/dccp/ipv4.c:898
 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2e4/0x510 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish+0x1c4/0x2f0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0xaf/0xd0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5532
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5646
 process_backlog+0x101/0x6b0 net/core/dev.c:5974
 __napi_poll.constprop.0+0xb4/0x540 net/core/dev.c:6536
 napi_poll net/core/dev.c:6605 [inline]
 net_rx_action+0x956/0xe90 net/core/dev.c:6738
 __do_softirq+0x21a/0x8de kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:tcp_error net/netfilter/nf_conntrack_proto_tcp.c:819 [inline]
RIP: 0010:nf_conntrack_tcp_packet+0x2d0/0x6820 net/netfilter/nf_conntrack_proto_tcp.c:981
Code: 8d bd e5 11 00 00 48 89 fa 48 c1 ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 f8 45 00 00 0f b6 ad e5 11 00 00 <31> ff 89 ee e8 f7 cb d1 f8 40 84 ed 74 40 e8 bd d0 d1 f8 48 8b 54
RSP: 0018:ffffc90003cff080 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801d22412c RCX: ffffffff88b64360
RDX: 0000000000000005 RSI: ffffffff88b6436e RDI: ffffffff92d3d165
RBP: 0000000000000001 R08: 0000000000000004 R09: 0000000000000b0c
R10: 0000000000000020 R11: 00000000ffff0000 R12: 0000000000000b0c
R13: 0000000000000020 R14: 0000000000000014 R15: ffff88801d224120
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1923 [inline]
 nf_conntrack_in+0x2e9/0x1850 net/netfilter/nf_conntrack_core.c:2013
 ipv4_conntrack_local+0x160/0x260 net/netfilter/nf_conntrack_proto.c:229
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xbb/0x1f0 net/netfilter/core.c:626
 nf_hook+0x386/0x6c0 include/linux/netfilter.h:269
 __ip_local_out+0x346/0x640 net/ipv4/ip_output.c:118
 ip_local_out net/ipv4/ip_output.c:127 [inline]
 __ip_queue_xmit+0x742/0x1a50 net/ipv4/ip_output.c:535
 __tcp_transmit_skb+0x1aa5/0x3d10 net/ipv4/tcp_output.c:1462
 tcp_transmit_skb net/ipv4/tcp_output.c:1480 [inline]
 tcp_write_xmit+0xfcb/0x7f10 net/ipv4/tcp_output.c:2792
 __tcp_push_pending_frames+0xaf/0x390 net/ipv4/tcp_output.c:2977
 tcp_push+0x22f/0x740 net/ipv4/tcp.c:736
 tcp_sendmsg_locked+0x2769/0x3460 net/ipv4/tcp.c:1308
 tcp_sendmsg+0x2e/0x40 net/ipv4/tcp.c:1340
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:847
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 sock_write_iter+0x29b/0x3d0 net/socket.c:1160
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:590
 ksys_write+0x1f0/0x250 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f0638b16bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffeb96efcf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000aec RCX: 00007f0638b16bf2
RDX: 0000000000000aec RSI: 00005584ababadf0 RDI: 0000000000000004
RBP: 00005584aba9c3f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00005584aa63aaa4
R13: 0000000000000c14 R14: 00005584aa63b3e8 R15: 00007ffeb96efd68
 </TASK>
dccp_check_seqno: Step 6 failed for RESET packet, (LSWL(85189918161943) <= P.seqno(0) <= S.SWH(85189918162017)) and (P.ackno exists or LAWL(194849485391615) <= P.ackno(194849485391618) <= S.AWH(194849485391618), sending SYNC...
----------------
Code disassembly (best guess):
   0:	8d bd e5 11 00 00    	lea    0x11e5(%rbp),%edi
   6:	48 89 fa             	mov    %rdi,%rdx
   9:	48 c1 ea 03          	shr    $0x3,%rdx
   d:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
  11:	48 89 fa             	mov    %rdi,%rdx
  14:	83 e2 07             	and    $0x7,%edx
  17:	38 d0                	cmp    %dl,%al
  19:	7f 08                	jg     0x23
  1b:	84 c0                	test   %al,%al
  1d:	0f 85 f8 45 00 00    	jne    0x461b
  23:	0f b6 ad e5 11 00 00 	movzbl 0x11e5(%rbp),%ebp
* 2a:	31 ff                	xor    %edi,%edi <-- trapping instruction
  2c:	89 ee                	mov    %ebp,%esi
  2e:	e8 f7 cb d1 f8       	call   0xf8d1cc2a
  33:	40 84 ed             	test   %bpl,%bpl
  36:	74 40                	je     0x78
  38:	e8 bd d0 d1 f8       	call   0xf8d1d0fa
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	54                   	push   %rsp