------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 9358 at lib/refcount.c:25 refcount_warn_saturate+0x174/0x1f0 lib/refcount.c:25
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9358 Comm: syz-executor.5 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:refcount_warn_saturate+0x174/0x1f0 lib/refcount.c:25
Code: 06 31 ff 89 de e8 0c 96 e4 fd 84 db 0f 85 33 ff ff ff e8 bf 94 e4 fd 48 c7 c7 e0 da 6f 88 c6 05 1f 1f ec 06 01 e8 db 1a b5 fd <0f> 0b e9 14 ff ff ff e8 a0 94 e4 fd 0f b6 1d 04 1f ec 06 31 ff 89
RSP: 0018:ffffc90002227d18 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e9f66 RDI: fffff52000444f95
RBP: ffffc90002227d28 R08: ffff888057ed6180 R09: ffffed1015d06659
R10: ffffed1015d06658 R11: ffff8880ae8332c7 R12: 0000000000000002
R13: 0000000000000000 R14: ffff8880578e8184 R15: ffff8880943f9048
 refcount_add include/linux/refcount.h:191 [inline]
 refcount_inc include/linux/refcount.h:228 [inline]
 get_net include/net/net_namespace.h:241 [inline]
 sk_alloc+0xeb3/0xfd0 net/core/sock.c:1669
 inet_create net/ipv4/af_inet.c:321 [inline]
 inet_create+0x363/0xdf0 net/ipv4/af_inet.c:247
 __sock_create+0x3ce/0x730 net/socket.c:1432
 sock_create net/socket.c:1483 [inline]
 __sys_socket+0x103/0x220 net/socket.c:1525
 __do_sys_socket net/socket.c:1534 [inline]
 __se_sys_socket net/socket.c:1532 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1532
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d467
Code: 00 00 00 49 89 ca b8 36 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4a 8b fb ff c3 66 0f 1f 84 00 00 00 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d 8b fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe5f9c7bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045d467
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00000000000003db R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5f9c82e0 R14: 00000000000aae09 R15: 00007ffe5f9c82f0
Kernel Offset: disabled
Rebooting in 86400 seconds..