------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 1 PID: 4516 at lib/refcount.c:153 refcount_inc+0x5d/0x70 lib/refcount.c:153
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4516 Comm: syz-executor1 Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b9/0x29f lib/dump_stack.c:53
 panic+0x22f/0x4de kernel/panic.c:183
 __warn.cold.8+0x163/0x1a3 kernel/panic.c:547
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1bc/0x470 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991
RIP: 0010:refcount_inc+0x5d/0x70 lib/refcount.c:153
RSP: 0018:ffff8801a5a4f838 EFLAGS: 00010286
RAX: 000000000000002b RBX: 0000000000000000 RCX: ffffffff815f2e0d
RDX: 0000000000000000 RSI: ffffffff815f7bf1 RDI: ffff8801a5a4f398
RBP: ffff8801a5a4f840 R08: ffff8801a5a44340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ab4e5500
R13: ffff8801a5a4fac8 R14: 0000000000000040 R15: ffff8801a301c040
 get_net include/net/net_namespace.h:206 [inline]
 sk_alloc+0x450/0x17b0 net/core/sock.c:1540
 inet_create+0x4f8/0x10a0 net/ipv4/af_inet.c:320
 __sock_create+0x526/0x920 net/socket.c:1285
 sock_create net/socket.c:1325 [inline]
 __sys_socket+0x100/0x250 net/socket.c:1355
 SYSC_socket net/socket.c:1364 [inline]
 SyS_socket+0x24/0x30 net/socket.c:1362
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457d87
RSP: 002b:00007ffeaaafd408 EFLAGS: 00000206 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00000000000003ab RCX: 0000000000457d87
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 000000000006d6cc R08: 0000000000000000 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000206 R12: 0000000000000a6d
R13: 0000000000000007 R14: 0000000000000a6d R15: 000000000006d49b
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..