kobject: 'tx-0' (ffff88011b553858): fill_kobj_path: path = '/devices/virtual/net/ip6gretap0/queues/tx-0'
kobject: 'batman_adv' (ffff88012af71c00): kobject_add_internal: parent: 'ip6gretap0', set: '<NULL>'
------------[ cut here ]------------
WARNING: CPU: 0 PID: 23918 at net/bridge/br_fdb.c:109 br_fdb_find+0x1bc/0x1e0 net/bridge/br_fdb.c:109
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 23918 Comm: syz-executor215 Not tainted 4.11.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0xe6/0x120 lib/dump_stack.c:52
 panic+0x1b6/0x358 kernel/panic.c:180
 __warn+0x18d/0x1b0 kernel/panic.c:541
 warn_slowpath_null+0x18/0x20 kernel/panic.c:584
 br_fdb_find+0x1bc/0x1e0 net/bridge/br_fdb.c:109
 fdb_insert+0xd3/0x320 net/bridge/br_fdb.c:529
 br_fdb_insert+0x35/0x50 net/bridge/br_fdb.c:557
 __vlan_add+0x10ac/0x2450 net/bridge/br_vlan.c:250
 br_vlan_add+0x9d2/0xc60 net/bridge/br_vlan.c:599
 br_vlan_init+0x17e/0x1f0 net/bridge/br_vlan.c:940
 br_dev_init+0xf5/0x230 net/bridge/br_device.c:106
 register_netdevice+0x259/0xd60 net/core/dev.c:7233
 br_dev_newlink+0x91/0xb0 net/bridge/br_netlink.c:1172
 rtnl_newlink+0xbe7/0x12f0 net/core/rtnetlink.c:2627
 rtnetlink_rcv_msg+0x222/0x670 net/core/rtnetlink.c:4104
 netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2298
 rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:4110
 netlink_unicast_kernel net/netlink/af_netlink.c:1231 [inline]
 netlink_unicast+0x45a/0x660 net/netlink/af_netlink.c:1257
 netlink_sendmsg+0x89c/0xb40 net/netlink/af_netlink.c:1803
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:643
 SYSC_sendto+0x1c9/0x300 net/socket.c:1685
 SyS_sendto+0x9/0x10 net/socket.c:1653
 entry_SYSCALL_64_fastpath+0x23/0xc6
RIP: 0033:0x401fd3
RSP: 002b:00007ffd798b63b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000401fd3
RDX: 000000000000003c RSI: 00000000006d4c30 RDI: 0000000000000003
RBP: 00007ffd798b6800 R08: 00007ffd798b63c0 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000004030e0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..