Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 37.886800] IPVS: Creating netns size=2712 id=1 [ 37.891612] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. 2020/10/10 01:13:28 parsed 1 programs 2020/10/10 01:13:28 executed programs: 0 [ 45.699833] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 45.713734] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 45.725492] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 45.735957] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 45.750417] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 45.759325] IPVS: Creating netns size=2712 id=2 [ 45.766371] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 45.772756] IPVS: ftp: loaded support on port[0] = 21 [ 45.849913] IPVS: Creating netns size=2712 id=3 [ 45.854769] IPVS: ftp: loaded support on port[0] = 21 [ 46.006495] chnl_net:caif_netlink_parms(): no params data found [ 46.045428] IPVS: Creating netns size=2712 id=4 [ 46.057785] IPVS: ftp: loaded support on port[0] = 21 [ 46.260533] chnl_net:caif_netlink_parms(): no params data found [ 46.297093] IPVS: Creating netns size=2712 id=5 [ 46.313038] IPVS: ftp: loaded support on port[0] = 21 [ 46.453483] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.460360] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.471060] device bridge_slave_0 entered promiscuous mode [ 46.509863] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.516640] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.527172] device bridge_slave_1 entered promiscuous mode [ 46.611376] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.636489] chnl_net:caif_netlink_parms(): no params data found [ 46.653867] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.755734] IPVS: Creating netns size=2712 id=6 [ 46.766374] IPVS: ftp: loaded support on port[0] = 21 [ 46.952521] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.019872] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.026283] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.038426] device bridge_slave_0 entered promiscuous mode [ 47.055704] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 47.063735] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.073266] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.082836] device bridge_slave_1 entered promiscuous mode [ 47.116168] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.163790] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.183515] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.241360] chnl_net:caif_netlink_parms(): no params data found [ 47.258863] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.274744] IPVS: Creating netns size=2712 id=7 [ 47.279936] IPVS: ftp: loaded support on port[0] = 21 [ 47.401256] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.409250] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.419598] device bridge_slave_0 entered promiscuous mode [ 47.427456] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.434885] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.496701] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.504188] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.513879] device bridge_slave_1 entered promiscuous mode [ 47.571539] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.716427] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.994589] chnl_net:caif_netlink_parms(): no params data found [ 48.034252] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.124667] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.158070] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.164443] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.174323] device bridge_slave_0 entered promiscuous mode [ 48.219217] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.269737] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.276112] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.285834] device bridge_slave_1 entered promiscuous mode [ 48.309092] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.375745] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.489283] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.525422] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.564924] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.652145] chnl_net:caif_netlink_parms(): no params data found [ 48.668598] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.740995] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.780473] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 48.853719] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.860410] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.870302] device bridge_slave_0 entered promiscuous mode [ 48.936982] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.943410] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.953167] device bridge_slave_1 entered promiscuous mode [ 49.072052] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 49.121820] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 49.130898] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 49.207456] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 49.471672] bridge0: port 1(bridge_slave_0) entered blocking state [ 49.479385] bridge0: port 1(bridge_slave_0) entered disabled state [ 49.489299] device bridge_slave_0 entered promiscuous mode [ 49.508515] ------------[ cut here ]------------ [ 49.513296] WARNING: CPU: 1 PID: 5888 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 49.521122] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 49.528167] Kernel panic - not syncing: panic_on_warn set ... [ 49.528167] [ 49.535524] CPU: 1 PID: 5888 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 49.543028] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.552365] 0000000000000000 ffff8800b46befc8 ffffffff82e18b12 ffffffff85e81040 [ 49.560403] ffff8800b46bf0a0 ffffffff85f2bc00 ffffffff8191bd7b 0000000000000009 [ 49.568485] ffff8800b46bf090 ffffffff8160d884 0000000041b58ab3 ffffffff86b3fd6a [ 49.577184] Call Trace: [ 49.579756] [] dump_stack+0x136/0x1d4 [ 49.585176] [] ? sysfs_warn_dup+0x7b/0xa0 [ 49.590945] [] panic+0x1af/0x348 [ 49.595935] [] ? to_vmem_altmap+0x125/0x125 [ 49.601881] [] ? sysfs_warn_dup+0x7b/0xa0 [ 49.607737] [] __warn+0x18d/0x1b0 [ 49.612809] [] warn_slowpath_fmt+0x92/0xb0 [ 49.618664] [] ? __warn+0x1b0/0x1b0 [ 49.623927] [] ? kernfs_path_from_node+0x4a/0x60 [ 49.630306] [] sysfs_warn_dup+0x7b/0xa0 [ 49.635903] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 49.642890] [] sysfs_create_link+0x43/0xb0 [ 49.648749] [] device_add+0x677/0x1350 [ 49.654309] [] ? device_private_init+0x180/0x180 [ 49.660696] [] ? kfree_const+0x1d/0x20 [ 49.666219] [] ? kobject_set_name_vargs+0xb4/0x130 [ 49.673036] [] device_create_groups_vargs+0x1c8/0x220 [ 49.679847] [] device_create+0x88/0xa0 [ 49.685355] [] ? device_create_vargs+0x20/0x20 [ 49.691561] [] ? macvlan_set_mac_address+0x150/0x150 [ 49.698287] [] macvtap_device_event+0x1c4/0x2a0 [ 49.704577] [] notifier_call_chain+0x8b/0x170 [ 49.710692] [] raw_notifier_call_chain+0x11/0x20 [ 49.717066] [] call_netdevice_notifiers_info+0x47/0x80 [ 49.723963] [] register_netdevice+0x8e8/0xd00 [ 49.730076] [] ? netdev_change_features+0x80/0x80 [ 49.736535] [] ? dev_get_nest_level+0x10c/0x1a0 [ 49.742822] [] macvlan_common_newlink+0x8b9/0x1090 [ 49.749381] [] macvtap_newlink+0xbf/0x110 [ 49.755146] [] ? __netlink_ns_capable+0xc7/0xf0 [ 49.761436] [] rtnl_newlink+0xd4b/0x1230 [ 49.767131] [] ? rtnl_link_ops_get+0x5d/0x90 [ 49.773154] [] ? rtnl_newlink+0x319/0x1230 [ 49.779005] [] ? load_balance+0x967/0x1ef0 [ 49.784856] [] ? rtnl_setlink+0x2f0/0x2f0 [ 49.790624] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 49.797359] [] ? __lock_acquire+0x15c3/0x5990 [ 49.803473] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 49.810467] [] ? __netlink_ns_capable+0xc7/0xf0 [ 49.816753] [] rtnetlink_rcv_msg+0x222/0x680 [ 49.822787] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 49.829643] [] ? rtnetlink_rcv+0x30/0x30 [ 49.835395] [] ? mutex_lock_nested+0x5fd/0xb30 [ 49.841603] [] ? rtnetlink_rcv+0x16/0x30 [ 49.847286] [] ? netlink_seq_start+0xe0/0xe0 [ 49.853314] [] netlink_rcv_skb+0x242/0x350 [ 49.859168] [] ? rtnetlink_rcv+0x30/0x30 [ 49.864849] [] rtnetlink_rcv+0x25/0x30 [ 49.870356] [] netlink_unicast+0x3da/0x560 [ 49.876227] [] ? netlink_sendskb+0x40/0x40 [ 49.882081] [] netlink_sendmsg+0x9bb/0xb40 [ 49.887934] [] ? nlmsg_notify+0xf0/0xf0 [ 49.893529] [] ? __might_fault+0xf1/0x1b0 [ 49.899298] [] ? nlmsg_notify+0xf0/0xf0 [ 49.904910] [] sock_sendmsg+0xb5/0xf0 [ 49.910332] [] SyS_sendto+0x1ca/0x290 [ 49.915756] [] ? SyS_getpeername+0x240/0x240 [ 49.921792] [] ? mntput_no_expire+0xce/0x600 [ 49.927817] [] ? mnt_get_count+0x1c0/0x1c0 [ 49.933683] [] ? mntput+0x52/0x70 [ 49.938804] [] ? task_work_run+0x14a/0x200 [ 49.944657] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 49.951464] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 49.958013] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 49.965858] Kernel Offset: disabled