audit: type=1400 audit(1516308417.311:7): avc:  denied  { map } for  pid=3663 comm="syzkaller267275" path="/root/syzkaller267275982" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file 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: 1 PID: 3663 Comm: syzkaller267275 Not tainted 4.15.0-rc8+ #178
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x1f/0xa0 lib/string.c:479
RSP: 0018:ffff8801d944f5c8 EFLAGS: 00010292
RAX: 0000000041b58ab3 RBX: ffff8801d96498c0 RCX: 000000000836b156
RDX: dffffc0000000000 RSI: ffff8801bbf32000 RDI: 0000000041b58ab3
RBP: ffff8801d944f5e0 R08: 1ffff1003b289e21 R09: 0000000000000000
R10: ffff8801d944f5d0 R11: ffffed003b289e0c R12: ffff8801d944f700
R13: 0000000041b58ab3 R14: 0000000000000040 R15: 1ffff1003b289ec4
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:0000000009a4a840
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000559d28bdb100 CR3: 00000001d9422004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strlen include/linux/string.h:266 [inline]
 netlink_ack+0x120/0xa10 net/netlink/af_netlink.c:2324
 netlink_rcv_skb+0x2d1/0x400 net/netlink/af_netlink.c:2415
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:635
 netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
 netlink_unicast+0x4ee/0x700 net/netlink/af_netlink.c:1301
 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:648
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2028
 __sys_sendmsg+0xe5/0x210 net/socket.c:2062
 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:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7f50c79
RSP: 002b:00000000ffc3d0cc EFLAGS: 00000286 ORIG_RAX: 0000000000000172
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020008000
RDX: 0000000000000000 RSI: 00000000080ea00c RDI: 000000000000003f
RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 37 ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 f9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 48 89 f8 48 89 e5 41 54 53 48 83 ec 08 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 04 84 d2 75 4b 80 38 00 
RIP: strlen+0x1f/0xa0 lib/string.c:479 RSP: ffff8801d944f5c8
---[ end trace 94a9380d9eae7fdf ]---