TCP: request_sock_TCP: Possible SYN flooding on port 20001. Sending cookies.  Check SNMP counters.
BUG: using __this_cpu_add() in preemptible [00000000] code: syz-executor0/6200
caller is __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
CPU: 1 PID: 6200 Comm: syz-executor0 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 33c28c0f7cbccbde ffff8800b3cd7800 ffffffff81d0278d
 0000000000000001 ffffffff839fe3a0 ffffffff83cef6a0 ffff8800b46dc740
 0000000000000003 ffff8800b3cd7840 ffffffff81d626d4 ffffffff810002b8
Call Trace:
 [<ffffffff81d0278d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0278d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81d626d4>] check_preemption_disabled+0x1d4/0x200 lib/smp_processor_id.c:46
 [<ffffffff810002b8>] ? 0xffffffff810002b8
 [<ffffffff81d6273c>] __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:62
 [<ffffffff83128879>] tcp_try_coalesce+0x249/0x4d0 net/ipv4/tcp_input.c:4278
 [<ffffffff831309f7>] tcp_queue_rcv+0x127/0x720 net/ipv4/tcp_input.c:4485
 [<ffffffff831482cb>] tcp_send_rcvq+0x39b/0x450 net/ipv4/tcp_input.c:4531
 [<ffffffff8311f5bf>] tcp_sendmsg+0x1e8f/0x2b10 net/ipv4/tcp.c:1134
 [<ffffffff831d509c>] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:755
 [<ffffffff82dea0aa>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82dea0aa>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82deaff8>] SYSC_sendto+0x2c8/0x340 net/socket.c:1665
 [<ffffffff82ded4f0>] SyS_sendto+0x40/0x50 net/socket.c:1633
 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98
audit: type=1326 audit(1517128872.148:19): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 pid=6210 comm="syz-executor3" exe="/root/syz-executor3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x453299 code=0x0
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
audit: type=1400 audit(1517128872.468:20): avc:  denied  { setopt } for  pid=6321 comm="syz-executor6" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_netfilter_socket permissive=1
IPv4: Oversized IP packet from 127.0.0.1
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable
netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6407 at net/xfrm/xfrm_user.c:2172 xfrm_add_acquire+0x97f/0xd20 net/xfrm/xfrm_user.c:2172()
BAD policy passed
Kernel panic - not syncing: panic_on_warn set ...

netlink: 17 bytes leftover after parsing attributes in process `syz-executor5'.
CPU: 0 PID: 6407 Comm: syz-executor4 Not tainted 4.4.113-g202e079 #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 c5dacd4c060d1be3 ffff8801d56c7390 ffffffff81d0278d
 ffffffff838439a0 ffff8801d56c7468 ffffffff83d0afc0 0000000000000009
 000000000000087c ffff8801d56c7458 ffffffff81419b6a 0000000041b58ab3
Call Trace:
 [<ffffffff81d0278d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0278d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81419b6a>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff8112d8d5>] warn_slowpath_common+0x125/0x140 kernel/panic.c:455
 [<ffffffff8112d9b1>] warn_slowpath_fmt+0xc1/0x110 kernel/panic.c:471
 [<ffffffff832d105f>] xfrm_add_acquire+0x97f/0xd20 net/xfrm/xfrm_user.c:2172
 [<ffffffff832cdfdc>] xfrm_user_rcv_msg+0x41c/0x6b0 net/xfrm/xfrm_user.c:2525
 [<ffffffff82f889be>] netlink_rcv_skb+0x13e/0x370 net/netlink/af_netlink.c:2349
 [<ffffffff832ca50f>] xfrm_netlink_rcv+0x6f/0x90 net/xfrm/xfrm_user.c:2533
 [<ffffffff82f87542>] netlink_unicast_kernel net/netlink/af_netlink.c:1267 [inline]
 [<ffffffff82f87542>] netlink_unicast+0x522/0x760 net/netlink/af_netlink.c:1293
 [<ffffffff82f88068>] netlink_sendmsg+0x8e8/0xc50 net/netlink/af_netlink.c:1847
 [<ffffffff82dea0aa>] sock_sendmsg_nosec net/socket.c:625 [inline]
 [<ffffffff82dea0aa>] sock_sendmsg+0xca/0x110 net/socket.c:635
 [<ffffffff82debc81>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962
 [<ffffffff82dedcd3>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996
 [<ffffffff82deddbd>] SYSC_sendmsg net/socket.c:2007 [inline]
 [<ffffffff82deddbd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2003
 [<ffffffff83771b5f>] entry_SYSCALL_64_fastpath+0x1c/0x98
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..