audit: type=1400 audit(1537815518.307:10): avc: denied { name_connect } for pid=5482 comm="syz-executor835" dest=20000 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:port_t:s0 tclass=dccp_socket permissive=1 hrtimer: interrupt took 25863 ns BUG: please report to dccp@vger.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:425/tfrc_rx_hist_sample_rtt() CPU: 0 PID: 5729 Comm: syz-executor835 Not tainted 4.19.0-rc5+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 FS-Cache: Duplicate cookie detected Call Trace: FS-Cache: O-cookie c=000000001e3ebd24 [p=00000000d151a9d2 fl=222 nc=0 na=1] FS-Cache: O-cookie d=000000005b645e59 n=00000000776bad6d __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 FS-Cache: O-key=[10] '02 00 tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c net/dccp/ccids/lib/packet_history.c:422 ccid3_hc_rx_packet_recv+0x5c4/0xeb0 net/dccp/ccids/ccid3.c:767 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline] dccp_deliver_input_to_ccids+0xf0/0x280 net/dccp/input.c:180 02 dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378 dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:654 sk_backlog_rcv include/net/sock.h:931 [inline] __sk_receive_skb+0x3e5/0xec0 net/core/sock.c:473 dccp_v4_rcv+0x10f9/0x1f58 net/dccp/ipv4.c:875 ip_local_deliver_finish+0x2e9/0xda0 net/ipv4/ip_input.c:215 00 NF_HOOK include/linux/netfilter.h:287 [inline] ip_local_deliver+0x1e9/0x750 net/ipv4/ip_input.c:256 00 00 02 00 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415 NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0xed/0x610 net/ipv4/ip_input.c:524 00 00 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4891 ' FS-Cache: N-cookie c=00000000d88e9bbd [p=00000000d151a9d2 fl=2 nc=0 na=1] FS-Cache: N-cookie d=000000005b645e59 n=00000000c2a3eb0a __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5001 FS-Cache: N-key=[10] ' process_backlog+0x217/0x760 net/core/dev.c:5807 02 napi_poll net/core/dev.c:6227 [inline] net_rx_action+0x7c5/0x1950 net/core/dev.c:6293 00 02 00 00 00 02 00 00 00 ' __do_softirq+0x30b/0xad8 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1047 do_softirq.part.13+0x126/0x160 kernel/softirq.c:336 do_softirq kernel/softirq.c:328 [inline] __local_bh_enable_ip+0x21d/0x260 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip_finish_output2+0xab6/0x18d0 net/ipv4/ip_output.c:231 ip_finish_output+0x7fd/0xf60 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip_output+0x21d/0x8d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 __ip_queue_xmit+0x9af/0x1f30 net/ipv4/ip_output.c:505 ip_queue_xmit+0x56/0x70 include/net/ip.h:197 dccp_transmit_skb+0x98c/0x12e0 net/dccp/output.c:142 dccp_xmit_packet+0x25e/0x8a0 net/dccp/output.c:281 dccp_write_xmit+0x190/0x1f0 net/dccp/output.c:363 dccp_sendmsg+0xdc8/0x1020 net/dccp/proto.c:816 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116 __sys_sendmsg+0x11d/0x280 net/socket.c:2154 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x44c9f9 Code: e8 0c ba 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 8b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb33968eda8 EFLAGS: 00000287 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000006e0ca8 RCX: 000000000044c9f9 RDX: 0000000004000080 RSI: 00000000200030c0 RDI: 0000000000000006 RBP: 00000000006e0ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000287 R12: 00000000006e0cac R13: 6aa12032941571b4 R14: 00676e697279656b R15: 00000000006e0d8c