------------[ cut here ]------------
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 0 PID: 6564 at lib/refcount.c:153 refcount_inc+0x5d/0x70 lib/refcount.c:153
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6564 Comm: syz-executor5 Not tainted 4.16.0+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 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:ffff88019b0c7838 EFLAGS: 00010286
RAX: 000000000000002b RBX: 0000000000000000 RCX: ffffffff815f58cd
RDX: 0000000000000000 RSI: ffffffff815fa581 RDI: ffff88019b0c7398
RBP: ffff88019b0c7840 R08: ffff8801acfc8380 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d8a92a80
R13: ffff88019b0c7ac8 R14: 0000000000000040 R15: ffff8801ad4d4240
 get_net include/net/net_namespace.h:206 [inline]
 sk_alloc+0x450/0x17b0 net/core/sock.c:1543
 inet_create+0x4f8/0x1050 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: 0033:0x457e57
RSP: 002b:00007ffea5a0f4b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000103 RCX: 0000000000457e57
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 000000000002f150 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000006 R11: 0000000000000202 R12: 00000000000002b7
R13: 0000000000000006 R14: 00000000000002b7 R15: 000000000002ef5d
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..