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: 7288 Comm: syz-executor.5 Not tainted 4.19.53+ #25
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:422
 ccid3_hc_rx_packet_recv+0x5cc/0xec0 net/dccp/ccids/ccid3.c:767
 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline]
 dccp_deliver_input_to_ccids+0xeb/0x270 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+0x13f/0x190 net/dccp/ipv4.c:656
 sk_backlog_rcv include/net/sock.h:941 [inline]
 __release_sock+0x129/0x3a0 net/core/sock.c:2337
 release_sock+0x59/0x1c0 net/core/sock.c:2853
 dccp_sendmsg+0x683/0xd00 net/dccp/proto.c:818
 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2115
 __sys_sendmmsg+0x1bf/0x4e0 net/socket.c:2210
 __do_sys_sendmmsg net/socket.c:2239 [inline]
 __se_sys_sendmmsg net/socket.c:2236 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4592c9
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:00007f8f1ba46c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004592c9
RDX: 00000000000003a6 RSI: 0000000020005700 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
IPVS: ftp: loaded support on port[0] = 21
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8f1ba476d4
R13: 00000000004c68a6 R14: 00000000004db840 R15: 00000000ffffffff
dccp_check_seqno: Step 6 failed for RESET packet, (LSWL(198906953279772) <= P.seqno(198906953279768) <= S.SWH(198906953279846)) and (P.ackno exists or LAWL(213936273523802) <= P.ackno(213936273523806) <= S.AWH(213936273523807), sending SYNC...
dccp_close: ABORT with 16046 bytes unread
IPVS: ftp: loaded support on port[0] = 21
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
net_ratelimit: 2 callbacks suppressed
dccp_close: ABORT with 16481 bytes unread
IPVS: ftp: loaded support on port[0] = 21
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread
dccp_close: ABORT with 16481 bytes unread
dccp_close: ABORT with 1061 bytes unread