bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_1 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5868 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
sysfs: cannot create duplicate filename '/class/macvtap/tap50'
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 5868 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800b47b6fc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b47b70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b47b7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2
Call Trace:
 [<ffffffff82c65e52>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65e52>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d884>] panic+0x1af/0x348 kernel/panic.c:152
 [<ffffffff81335ecd>] __warn+0x18d/0x1b0 kernel/panic.c:504
 [<ffffffff81335f82>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527
 [<ffffffff8191bd7b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c5f1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c653>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c653>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83530677>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83530677>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff835316b8>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff835317b8>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff835317b8>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d0aa4>] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298
 [<ffffffff81399feb>] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93
 [<ffffffff8139a0f1>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8139a0f1>] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 [<ffffffff84920ba7>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff849455f8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff849455f8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c81f9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838cee6f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff849760ab>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84970b52>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84af4172>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff84970925>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84af2d0a>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84af2d0a>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84af393b>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848cfe35>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848cfe35>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848d3c2a>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848d3c2a>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b70c40>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled