BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:422/tfrc_rx_hist_sample_rtt()
CPU: 0 PID: 8372 Comm: syz-executor.5 Not tainted 5.0.0-rc6-next-20190213 #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 tfrc_rx_hist_sample_rtt.cold+0x56/0x61 net/dccp/ccids/lib/packet_history.c:422
 ccid3_hc_rx_packet_recv+0x5c6/0xeb0 net/dccp/ccids/ccid3.c:767
 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline]
 dccp_deliver_input_to_ccids+0xee/0x280 net/dccp/input.c:180
 dccp_rcv_established net/dccp/input.c:378 [inline]
 dccp_rcv_established+0x83/0xb0 net/dccp/input.c:368
 dccp_v4_do_rcv+0x139/0x190 net/dccp/ipv4.c:659
 sk_backlog_rcv include/net/sock.h:937 [inline]
 __sk_receive_skb+0x33a/0xbd0 net/core/sock.c:527
 dccp_v4_rcv+0xeaa/0x1bf1 net/dccp/ipv4.c:880
 ip_protocol_deliver_rcu+0x60/0x8e0 net/ipv4/ip_input.c:208
 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:234
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:255
 dst_input include/net/dst.h:450 [inline]
 ip_rcv_finish+0x1db/0x2f0 net/ipv4/ip_input.c:414
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:524
 __netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4973
 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083
 process_backlog+0x206/0x750 net/core/dev.c:5923
 napi_poll net/core/dev.c:6346 [inline]
 net_rx_action+0x4fa/0x1070 net/core/dev.c:6412
 __do_softirq+0x266/0x95a kernel/softirq.c:293
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027
 </IRQ>
 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:338
 do_softirq kernel/softirq.c:330 [inline]
 __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:190
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:684 [inline]
 ip_finish_output2+0x99c/0x1740 net/ipv4/ip_output.c:231
 ip_finish_output+0x73c/0xd50 net/ipv4/ip_output.c:317
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x21f/0x670 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc4/0x1b0 net/ipv4/ip_output.c:124
 __ip_queue_xmit+0x86f/0x1bf0 net/ipv4/ip_output.c:505
 ip_queue_xmit+0x5a/0x70 include/net/ip.h:198
 dccp_transmit_skb+0x977/0x12c0 net/dccp/output.c:142
 dccp_xmit_packet+0x1f6/0x660 net/dccp/output.c:281
 dccp_write_xmit+0x181/0x1e0 net/dccp/output.c:363
 dccp_sendmsg+0xa60/0xd00 net/dccp/proto.c:816
 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:631
 ___sys_sendmsg+0x3e2/0x930 net/socket.c:2136
 __sys_sendmmsg+0x1c3/0x4e0 net/socket.c:2231
 __do_sys_sendmmsg net/socket.c:2260 [inline]
 __se_sys_sendmmsg net/socket.c:2257 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2257
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4058bb7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457e29
RDX: 0000000000000002 RSI: 0000000020001f00 RDI: 0000000000000009
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040011 R11: 0000000000000246 R12: 00007f4058bb86d4
R13: 00000000004c4dd8 R14: 00000000004d8a70 R15: 00000000ffffffff