[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 37.750067] IPVS: Creating netns size=2712 id=1 [ 37.755276] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.205' (ECDSA) to the list of known hosts. 2020/03/26 11:16:42 parsed 1 programs 2020/03/26 11:16:42 executed programs: 0 [ 46.334923] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 46.371841] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 46.382594] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 46.384354] IPVS: Creating netns size=2712 id=2 [ 46.384480] IPVS: ftp: loaded support on port[0] = 21 [ 46.413959] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 46.422228] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 46.430417] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 46.506695] IPVS: Creating netns size=2712 id=3 [ 46.511721] IPVS: ftp: loaded support on port[0] = 21 [ 46.681832] chnl_net:caif_netlink_parms(): no params data found [ 46.721766] IPVS: Creating netns size=2712 id=4 [ 46.727702] IPVS: ftp: loaded support on port[0] = 21 [ 46.933745] chnl_net:caif_netlink_parms(): no params data found [ 47.002127] IPVS: Creating netns size=2712 id=5 [ 47.007171] IPVS: ftp: loaded support on port[0] = 21 [ 47.091368] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.098328] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.107998] device bridge_slave_0 entered promiscuous mode [ 47.145464] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.151988] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.161891] device bridge_slave_1 entered promiscuous mode [ 47.256073] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.287186] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.407305] IPVS: Creating netns size=2712 id=6 [ 47.414029] IPVS: ftp: loaded support on port[0] = 21 [ 47.525627] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.532089] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.543358] device bridge_slave_0 entered promiscuous mode [ 47.589831] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.596648] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.606840] device bridge_slave_1 entered promiscuous mode [ 47.615212] chnl_net:caif_netlink_parms(): no params data found [ 47.840198] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.851137] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.865674] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.880752] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.953241] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.969492] chnl_net:caif_netlink_parms(): no params data found [ 47.981749] IPVS: Creating netns size=2712 id=7 [ 47.988170] IPVS: ftp: loaded support on port[0] = 21 [ 48.023309] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.282244] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.289972] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.389743] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.477129] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.505872] chnl_net:caif_netlink_parms(): no params data found [ 48.529774] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.537139] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.546863] device bridge_slave_0 entered promiscuous mode [ 48.645168] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.651845] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.663593] device bridge_slave_1 entered promiscuous mode [ 48.754962] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.767981] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.839668] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.872356] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.980407] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.988775] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.999521] device bridge_slave_0 entered promiscuous mode [ 49.008430] bridge0: port 2(bridge_slave_1) entered blocking state [ 49.015891] bridge0: port 2(bridge_slave_1) entered disabled state [ 49.025343] device bridge_slave_1 entered promiscuous mode [ 49.154426] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 49.210940] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 49.375439] chnl_net:caif_netlink_parms(): no params data found [ 49.572387] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 49.642815] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 49.690622] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 49.766069] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 49.774290] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 49.865906] bridge0: port 1(bridge_slave_0) entered blocking state [ 49.873571] bridge0: port 1(bridge_slave_0) entered disabled state [ 49.884520] device bridge_slave_0 entered promiscuous mode [ 49.894032] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 49.925032] bridge0: port 2(bridge_slave_1) entered blocking state [ 49.932141] bridge0: port 2(bridge_slave_1) entered disabled state [ 49.940997] device bridge_slave_1 entered promiscuous mode [ 49.975005] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 50.050606] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 50.060064] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 50.115736] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 50.127984] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 50.158628] bridge0: port 1(bridge_slave_0) entered blocking state [ 50.165511] bridge0: port 1(bridge_slave_0) entered disabled state [ 50.175286] device bridge_slave_0 entered promiscuous mode [ 50.245553] bridge0: port 2(bridge_slave_1) entered blocking state [ 50.252248] bridge0: port 2(bridge_slave_1) entered disabled state [ 50.261126] device bridge_slave_1 entered promiscuous mode [ 50.307536] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 50.391064] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 50.469838] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 50.697440] ------------[ cut here ]------------ [ 50.704377] WARNING: CPU: 1 PID: 5896 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 50.712219] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 50.719230] Kernel panic - not syncing: panic_on_warn set ... [ 50.719230] [ 50.726658] CPU: 1 PID: 5896 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 50.734296] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.743688] 1ffffffff0d95756 ffff8800b2f1efb0 ffffffff82c74fc6 ffffffff85c81040 [ 50.751979] ffff8800b2f1f088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b2f1f078 [ 50.760051] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 50.768057] Call Trace: [ 50.770647] [] dump_stack+0xe6/0x120 [ 50.775988] [] ? sysfs_warn_dup+0x7b/0xa0 [ 50.781778] [] panic+0x1af/0x348 [ 50.787203] [] ? set_ti_thread_flag+0xf/0xf [ 50.793150] [] ? sysfs_warn_dup+0x7b/0xa0 [ 50.798919] [] __warn+0x18d/0x1b0 [ 50.804125] [] warn_slowpath_fmt+0x92/0xb0 [ 50.809993] [] ? __warn+0x1b0/0x1b0 [ 50.815278] [] ? kernfs_path_from_node+0x4a/0x60 [ 50.821665] [] sysfs_warn_dup+0x7b/0xa0 [ 50.827267] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 50.834309] [] sysfs_create_link+0x43/0xb0 [ 50.840289] [] device_add+0x689/0x1360 [ 50.845809] [] ? kfree_const+0x1d/0x20 [ 50.851346] [] ? device_private_init+0x180/0x180 [ 50.857727] [] ? kfree_const+0x1d/0x20 [ 50.863245] [] ? kobject_set_name_vargs+0xb4/0x130 [ 50.869799] [] device_create_groups_vargs+0x1c8/0x220 [ 50.876612] [] device_create+0x88/0xa0 [ 50.882137] [] ? device_create_vargs+0x20/0x20 [ 50.888419] [] ? macvlan_set_mac_address+0x150/0x150 [ 50.895217] [] macvtap_device_event+0x1c4/0x2a0 [ 50.901549] [] notifier_call_chain+0x8b/0x170 [ 50.907811] [] raw_notifier_call_chain+0x11/0x20 [ 50.914221] [] call_netdevice_notifiers_info+0x47/0x80 [ 50.921129] [] register_netdevice+0x88a/0xce0 [ 50.927265] [] ? netdev_change_features+0x80/0x80 [ 50.933735] [] ? dev_get_nest_level+0x10c/0x1a0 [ 50.940057] [] macvlan_common_newlink+0x8b9/0x1090 [ 50.946630] [] macvtap_newlink+0xbf/0x110 [ 50.952421] [] ? __netlink_ns_capable+0xc7/0xf0 [ 50.958718] [] rtnl_newlink+0xd4b/0x1230 [ 50.964511] [] ? rtnl_link_ops_get+0x5d/0x90 [ 50.970679] [] ? rtnl_newlink+0x319/0x1230 [ 50.976672] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 50.983671] [] ? rtnl_setlink+0x2f0/0x2f0 [ 50.989463] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 50.996193] [] ? __lock_acquire+0x1985/0x5560 [ 51.002331] [] ? update_cfs_rq_load_avg+0x511/0x1100 [ 51.009067] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 51.016077] [] ? __netlink_ns_capable+0xc7/0xf0 [ 51.022384] [] rtnetlink_rcv_msg+0x222/0x680 [ 51.028416] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 51.035410] [] ? rtnetlink_rcv+0x30/0x30 [ 51.041100] [] ? mutex_lock_nested+0x638/0xb30 [ 51.047374] [] ? rtnetlink_rcv+0x16/0x30 [ 51.053144] [] ? netlink_lookup+0xd4/0x630 [ 51.059123] [] netlink_rcv_skb+0x242/0x350 [ 51.065032] [] ? rtnetlink_rcv+0x30/0x30 [ 51.070738] [] rtnetlink_rcv+0x25/0x30 [ 51.076310] [] netlink_unicast+0x455/0x660 [ 51.082192] [] ? netlink_unicast+0x3b5/0x660 [ 51.088378] [] ? netlink_attachskb+0x730/0x730 [ 51.094603] [] netlink_sendmsg+0x893/0xb40 [ 51.100477] [] ? netlink_unicast+0x660/0x660 [ 51.106534] [] ? __might_fault+0xf1/0x1b0 [ 51.112315] [] ? netlink_unicast+0x660/0x660 [ 51.118575] [] sock_sendmsg+0xb5/0xf0 [ 51.124170] [] SYSC_sendto+0x1c9/0x300 [ 51.129817] [] ? SYSC_connect+0x2a0/0x2a0 [ 51.135614] [] ? mntput_no_expire+0xb1/0x600 [ 51.141652] [] ? mntput_no_expire+0xce/0x600 [ 51.147763] [] ? mnt_get_count+0x1c0/0x1c0 [ 51.153644] [] ? mntput+0x52/0x70 [ 51.158741] [] ? ___might_sleep+0x331/0x440 [ 51.164708] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 51.171541] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 51.178116] [] SyS_sendto+0x9/0x10 [ 51.183485] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 51.191852] Kernel Offset: disabled