BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:409/tfrc_rx_hist_sample_rtt() CPU: 0 PID: 26908 Comm: syz-executor.3 Not tainted 5.2.0-rc5+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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:409 ccid3_hc_rx_packet_recv+0x5c6/0xeb0 net/dccp/ccids/ccid3.c:754 ccid_hc_rx_packet_recv net/dccp/ccid.h:182 [inline] dccp_deliver_input_to_ccids+0xeb/0x270 net/dccp/input.c:176 dccp_rcv_established net/dccp/input.c:374 [inline] dccp_rcv_established+0x83/0xb0 net/dccp/input.c:364 dccp_v4_do_rcv+0x139/0x190 net/dccp/ipv4.c:655 sk_backlog_rcv include/net/sock.h:945 [inline] __sk_receive_skb+0x335/0xbd0 net/core/sock.c:522 dccp_v4_rcv+0xeaa/0x1be5 net/dccp/ipv4.c:876 ip_protocol_deliver_rcu+0x5a/0x8e0 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:439 [inline] ip_rcv_finish+0x1d9/0x2f0 net/ipv4/ip_input.c:413 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0x113/0x1a0 net/core/dev.c:5009 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5123 process_backlog+0x206/0x750 net/core/dev.c:5934 napi_poll net/core/dev.c:6357 [inline] net_rx_action+0x4f5/0x1070 net/core/dev.c:6423 __do_softirq+0x25c/0x94c kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1040 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:682 [inline] ip_finish_output2+0x93a/0x24c0 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x5fc/0xbc0 net/ipv4/ip_output.c:290 ip_finish_output+0x38/0x1f0 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x21f/0x670 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:433 [inline] ip_local_out+0xbb/0x1b0 net/ipv4/ip_output.c:125 __ip_queue_xmit+0x86f/0x1bf0 net/ipv4/ip_output.c:515 ip_queue_xmit+0x5a/0x70 include/net/ip.h:236 dccp_transmit_skb+0x966/0x12a0 net/dccp/output.c:138 dccp_xmit_packet+0x1f6/0x660 net/dccp/output.c:277 dccp_write_xmit+0x17f/0x1e0 net/dccp/output.c:359 dccp_sendmsg+0xa5e/0xd00 net/dccp/proto.c:812 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:665 ___sys_sendmsg+0x803/0x920 net/socket.c:2286 __sys_sendmsg+0x105/0x1d0 net/socket.c:2324 __do_sys_sendmsg net/socket.c:2333 [inline] __se_sys_sendmsg net/socket.c:2331 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2331 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff9ec24bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 0000000000000004 RSI: 0000000020000400 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff9ec24c6d4 R13: 00000000004ce1a0 R14: 00000000004dc248 R15: 00000000ffffffff protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1