audit: type=1400 audit(1520330723.276:11): avc: denied { name_connect } for pid=4408 comm="syz-executor0" 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 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4430 Comm: syz-executor0 Not tainted 4.16.0-rc4+ #252 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:169 [inline] RIP: 0010:dccp_write_xmit+0x69/0x1d0 net/dccp/output.c:353 RSP: 0018:ffff8801ad2c76b8 EFLAGS: 00010246 RAX: ffff8801ad390380 RBX: ffff8801ad76e0c0 RCX: ffffffff854d7bd1 RDX: 0000000000000000 RSI: 1ffff10035a72183 RDI: ffff8801ad76e0c0 RBP: ffff8801ad2c76e8 R08: 1ffff10035a58e99 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801af1eb3c0 R13: dffffc0000000000 R14: ffffed0035aedd13 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7fe6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000008452798 CR3: 00000001b496a002 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dccp_sendmsg+0x95f/0xdc0 net/dccp/proto.c:813 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 C_SYSC_sendmsg net/compat.c:739 [inline] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:737 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7feac99 RSP: 002b:00000000f7fe609c EFLAGS: 00000286 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000020000140 RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: 00 00 48 85 c0 49 89 c4 0f 84 fb 00 00 00 e8 5f 8a 23 fc 41 80 3e 00 0f 85 5a 01 00 00 4c 8b bb d8 07 00 00 4c 89 fa 48 c1 ea 03 <42> 80 3c 2a 00 0f 85 34 01 00 00 4d 8b 3f 49 8d bf b0 00 00 00 RIP: ccid_hc_tx_send_packet net/dccp/ccid.h:169 [inline] RSP: ffff8801ad2c76b8 RIP: dccp_write_xmit+0x69/0x1d0 net/dccp/output.c:353 RSP: ffff8801ad2c76b8 ---[ end trace 10532854a4ca33d1 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..