audit: type=1400 audit(1515570041.039:9): avc:  denied  { prog_run } for  pid=3496 comm="syzkaller081004" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
------------[ cut here ]------------
kernel BUG at net/l2tp/l2tp_ppp.c:176!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3496 Comm: syzkaller081004 Not tainted 4.15.0-rc6-mm1+ #52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline]
RIP: 0010:pppol2tp_sendmsg+0x4fd/0x660 net/l2tp/l2tp_ppp.c:304
RSP: 0018:ffff8801c53af438 EFLAGS: 00010293
RAX: ffff8801c0656000 RBX: ffff8801c0016ec0 RCX: ffffffff8503a61d
RDX: 0000000000000000 RSI: ffff8801c53af598 RDI: ffff8801c00172a0
RBP: ffff8801c53af4a8 R08: 0000000000000000 R09: 1ffff10038a75e17
R10: 0000000000000003 R11: 0000000000000001 R12: ffff8801c0109bc0
R13: 0000000000000000 R14: 0000000000008000 R15: 0000000000000000
FS:  0000000002196880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea0000 CR3: 00000001c05fb002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 kernel_sendmsg+0x47/0x60 net/socket.c:646
 sock_no_sendpage+0x1cc/0x280 net/core/sock.c:2581
 kernel_sendpage+0xbf/0xe0 net/socket.c:3349
 kcm_write_msgs+0x404/0x1b80 net/kcm/kcmsock.c:646
 kcm_sendmsg+0x148d/0x22d0 net/kcm/kcmsock.c:1035
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018
 __sys_sendmsg+0xe5/0x210 net/socket.c:2052
 SYSC_sendmsg net/socket.c:2063 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2059
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x440159
RSP: 002b:00007ffc7e77e888 EFLAGS: 00000217 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000440159
RDX: 0000000000000000 RSI: 00000000201fcfc8 RDI: 0000000000000005
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401ac0
R13: 0000000000401b50 R14: 0000000000000000 R15: 0000000000000000
Code: ba ad 6c fc 48 8b 7d d0 e8 a1 94 58 fd 84 c0 74 0d e8 a8 ad 6c fc 48 89 df e8 60 90 2e ff 41 bd f7 ff ff ff eb 86 e8 93 ad 6c fc <0f> 0b 41 bd 95 ff ff ff e9 74 ff ff ff e8 a1 bd a4 fc e9 8c fb 
RIP: pppol2tp_sock_to_session net/l2tp/l2tp_ppp.c:176 [inline] RSP: ffff8801c53af438
RIP: pppol2tp_sendmsg+0x4fd/0x660 net/l2tp/l2tp_ppp.c:304 RSP: ffff8801c53af438
---[ end trace f56c69444f7d5a8a ]---