------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 1 PID: 8345 at lib/refcount.c:25 refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8345 Comm: syz-executor.5 Not tainted 5.9.0-rc4-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+0x1d6/0x29e lib/dump_stack.c:118
 panic+0x2c0/0x800 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:refcount_warn_saturate+0x13d/0x1a0 lib/refcount.c:25
Code: c7 e3 89 15 89 31 c0 e8 01 fc a6 fd 0f 0b eb a3 e8 58 5c d5 fd c6 05 ba 5b eb 05 01 48 c7 c7 1a 8a 15 89 31 c0 e8 e3 fb a6 fd <0f> 0b eb 85 e8 3a 5c d5 fd c6 05 9d 5b eb 05 01 48 c7 c7 46 8a 15
RSP: 0018:ffffc9000a647d68 EFLAGS: 00010246
RAX: 15d20a0c66d9db00 RBX: 0000000000000002 RCX: ffff888095b34180
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff815e27d0 R09: ffffed1015d262c0
R10: ffffed1015d262c0 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88809e39a000 R14: ffff88809e39a000 R15: ffff88808ec92144
 refcount_add include/linux/refcount.h:205 [inline]
 refcount_inc include/linux/refcount.h:241 [inline]
 get_net include/net/net_namespace.h:248 [inline]
 sk_alloc+0x269/0x300 net/core/sock.c:1751
 __netlink_create+0x6a/0x270 net/netlink/af_netlink.c:630
 netlink_create+0x370/0x4d0 net/netlink/af_netlink.c:693
 __sock_create+0x5b3/0x8c0 net/socket.c:1427
 sock_create net/socket.c:1478 [inline]
 __sys_socket+0xde/0x2d0 net/socket.c:1520
 __do_sys_socket net/socket.c:1529 [inline]
 __se_sys_socket net/socket.c:1527 [inline]
 __x64_sys_socket+0x76/0x80 net/socket.c:1527
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c8f9
Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1549861c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f15498626d4 RCX: 000000000045c8f9
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000b8e R14: 00000000004cdc94 R15: 000000000076bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..