device bridge_slave_1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready bond0: Enslaving bond_slave_0 as an active interface with an up link bond0: Enslaving bond_slave_1 as an active interface with an up link ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5896 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: 5896 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 1ffffffff0d95756 ffff8800b2f1efb0 ffffffff82c74fc6 ffffffff85c81040 ffff8800b2f1f088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b2f1f078 ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xe6/0x120 lib/dump_stack.c:51 [] ? sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] panic+0x1af/0x348 kernel/panic.c:152 [] ? set_ti_thread_flag+0xf/0xf include/linux/thread_info.h:73 [] ? sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] ? __warn+0x1b0/0x1b0 kernel/panic.c:494 [] ? spin_unlock_irqrestore include/linux/spinlock.h:362 [inline] [] ? kernfs_path_from_node+0x4a/0x60 fs/kernfs/dir.c:234 [] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 fs/sysfs/symlink.c:51 [] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] [] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92 [] device_add_class_symlinks drivers/base/core.c:891 [inline] [] device_add+0x689/0x1360 drivers/base/core.c:1086 [] ? kfree_const+0x1d/0x20 mm/util.c:35 [] ? device_private_init+0x180/0x180 drivers/base/core.c:996 [] ? kfree_const+0x1d/0x20 mm/util.c:35 [] ? kobject_set_name_vargs+0xb4/0x130 lib/kobject.c:285 [] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709 [] device_create_vargs drivers/base/core.c:1749 [inline] [] device_create+0x88/0xa0 drivers/base/core.c:1785 [] ? device_create_vargs+0x20/0x20 drivers/base/core.c:1751 [] ? macvlan_set_mac_address+0x150/0x150 drivers/net/macvlan.c:697 [] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298 [] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93 [] __raw_notifier_call_chain kernel/notifier.c:394 [inline] [] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401 [] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643 [] call_netdevice_notifiers net/core/dev.c:1659 [inline] [] register_netdevice+0x88a/0xce0 net/core/dev.c:7027 [] ? netdev_change_features+0x80/0x80 net/core/dev.c:6801 [] ? dev_get_nest_level+0x10c/0x1a0 net/core/dev.c:5974 [] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316 [] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471 [] ? __netlink_ns_capable+0xc7/0xf0 net/netlink/af_netlink.c:783 [] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466 [] ? rtnl_link_ops_get+0x5d/0x90 net/core/rtnetlink.c:284 [] ? rtnl_newlink+0x319/0x1230 net/core/rtnetlink.c:2322 [] ? debug_check_no_locks_freed+0x3c0/0x3c0 include/linux/sched.h:1954 [] ? rtnl_setlink+0x2f0/0x2f0 net/core/rtnetlink.c:2067 [] ? debug_lockdep_rcu_enabled+0x77/0x90 kernel/rcu/update.c:261 [] ? lookup_chain_cache kernel/locking/lockdep.c:2133 [inline] [] ? validate_chain kernel/locking/lockdep.c:2231 [inline] [] ? __lock_acquire+0x1985/0x5560 kernel/locking/lockdep.c:3329 [] ? __update_load_avg kernel/sched/fair.c:2716 [inline] [] ? update_cfs_rq_load_avg+0x511/0x1100 kernel/sched/fair.c:2843 [] ? debug_check_no_locks_freed+0x3c0/0x3c0 include/linux/sched.h:1954 [] ? __netlink_ns_capable+0xc7/0xf0 net/netlink/af_netlink.c:783 [] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513 [] ? __trace_hardirqs_on_caller kernel/locking/lockdep.c:2680 [inline] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 kernel/locking/lockdep.c:2727 [] ? rtnetlink_rcv+0x30/0x30 net/core/rtnetlink.c:3521 [] ? __mutex_lock_common kernel/locking/mutex.c:601 [inline] [] ? mutex_lock_nested+0x638/0xb30 kernel/locking/mutex.c:618 [] ? rtnl_lock net/core/rtnetlink.c:70 [inline] [] ? rtnetlink_rcv+0x16/0x30 net/core/rtnetlink.c:3518 [] ? rcu_read_lock include/linux/rcupdate.h:871 [inline] [] ? netlink_lookup+0xd4/0x630 net/netlink/af_netlink.c:457 [] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277 [] ? rtnetlink_rcv+0x30/0x30 net/core/rtnetlink.c:3521 [] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519 [] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline] [] netlink_unicast+0x455/0x660 net/netlink/af_netlink.c:1240 [] ? netlink_deliver_tap_kernel net/netlink/af_netlink.c:275 [inline] [] ? netlink_unicast_kernel net/netlink/af_netlink.c:1213 [inline] [] ? netlink_unicast+0x3b5/0x660 net/netlink/af_netlink.c:1240 [] ? netlink_attachskb+0x730/0x730 include/linux/sched.h:2918 [] netlink_sendmsg+0x893/0xb40 net/netlink/af_netlink.c:1786 [] ? netlink_unicast+0x660/0x660 include/net/sock.h:1975 [] ? __might_fault+0xf1/0x1b0 mm/memory.c:3876 [] ? netlink_unicast+0x660/0x660 include/net/sock.h:1975 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto+0x1c9/0x300 net/socket.c:1648 [] ? SYSC_connect+0x2a0/0x2a0 net/socket.c:1540 [] ? rcu_read_unlock include/linux/rcupdate.h:922 [inline] [] ? mntput_no_expire+0xb1/0x600 fs/namespace.c:1095 [] ? rcu_lock_release include/linux/rcupdate.h:491 [inline] [] ? rcu_read_unlock include/linux/rcupdate.h:926 [inline] [] ? mntput_no_expire+0xce/0x600 fs/namespace.c:1095 [] ? mnt_get_count+0x1c0/0x1c0 fs/namespace.c:184 [] ? mntput+0x52/0x70 fs/namespace.c:1143 [] ? ___might_sleep+0x331/0x440 kernel/sched/core.c:7435 [] ? __trace_hardirqs_on_caller kernel/locking/lockdep.c:2680 [inline] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 kernel/locking/lockdep.c:2727 [] ? trace_hardirqs_on_thunk+0x1b/0x1d [] SyS_sendto+0x9/0x10 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled