[ 39.136499] audit: type=1800 audit(1583936060.696:27): pid=7254 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.160719] audit: type=1800 audit(1583936060.716:28): pid=7254 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.655320] audit: type=1800 audit(1583936061.216:29): pid=7254 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 51.209335] IPVS: Creating netns size=2712 id=1 [ 51.214104] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.221' (ECDSA) to the list of known hosts. 2020/03/11 14:14:40 parsed 1 programs 2020/03/11 14:14:41 executed programs: 0 [ 59.562981] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 59.577702] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 59.586756] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 59.595091] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 59.603196] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 59.611572] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 59.630518] IPVS: Creating netns size=2712 id=2 [ 59.635444] IPVS: ftp: loaded support on port[0] = 21 [ 59.710094] IPVS: Creating netns size=2712 id=3 [ 59.715021] IPVS: ftp: loaded support on port[0] = 21 [ 59.863055] IPVS: Creating netns size=2712 id=4 [ 59.868005] IPVS: ftp: loaded support on port[0] = 21 [ 59.874427] chnl_net:caif_netlink_parms(): no params data found [ 60.022414] IPVS: Creating netns size=2712 id=5 [ 60.027880] IPVS: ftp: loaded support on port[0] = 21 [ 60.222869] chnl_net:caif_netlink_parms(): no params data found [ 60.320328] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.327079] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.336616] device bridge_slave_0 entered promiscuous mode [ 60.363601] IPVS: Creating netns size=2712 id=6 [ 60.368685] IPVS: ftp: loaded support on port[0] = 21 [ 60.393590] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.401108] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.410603] device bridge_slave_1 entered promiscuous mode [ 60.536222] chnl_net:caif_netlink_parms(): no params data found [ 60.555674] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.604650] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.851328] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.857890] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.868022] IPVS: Creating netns size=2712 id=7 [ 60.870042] device bridge_slave_0 entered promiscuous mode [ 60.873912] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.873998] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.879645] device bridge_slave_1 entered promiscuous mode [ 60.901722] IPVS: ftp: loaded support on port[0] = 21 [ 60.970178] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 60.998299] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.016208] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.043305] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.053403] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 61.085828] chnl_net:caif_netlink_parms(): no params data found [ 61.123747] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 61.391853] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.398416] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.408332] device bridge_slave_0 entered promiscuous mode [ 61.468224] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.474836] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.486202] device bridge_slave_1 entered promiscuous mode [ 61.537560] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 61.544618] chnl_net:caif_netlink_parms(): no params data found [ 61.599234] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.608102] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 61.627633] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 61.636064] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 61.671312] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.913269] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.058676] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 62.207630] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.214153] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.224014] device bridge_slave_0 entered promiscuous mode [ 62.254177] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.262547] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.269140] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.278239] device bridge_slave_0 entered promiscuous mode [ 62.286195] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.292664] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.302513] device bridge_slave_1 entered promiscuous mode [ 62.341651] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.349113] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.355616] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.365285] device bridge_slave_1 entered promiscuous mode [ 62.438062] chnl_net:caif_netlink_parms(): no params data found [ 62.516229] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.593722] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.619161] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.675845] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.685910] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.763908] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.062341] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 63.197195] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.243695] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.253274] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.295877] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.335618] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.342126] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.351364] device bridge_slave_0 entered promiscuous mode [ 63.435246] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.441806] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.451192] device bridge_slave_1 entered promiscuous mode [ 63.500076] ------------[ cut here ]------------ [ 63.505191] WARNING: CPU: 0 PID: 7513 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 63.512975] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 63.520478] Kernel panic - not syncing: panic_on_warn set ... [ 63.520478] [ 63.527926] CPU: 0 PID: 7513 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 63.536337] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.546734] 1ffffffff0d95756 ffff8800b4386e00 ffffffff82c74fc6 ffffffff85c81040 [ 63.554765] ffff8800b4386ed8 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4386ec8 [ 63.563283] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 63.571520] Call Trace: [ 63.574094] [] dump_stack+0xe6/0x120 [ 63.579456] [] ? sysfs_warn_dup+0x7b/0xa0 [ 63.585233] [] panic+0x1af/0x348 [ 63.590329] [] ? set_ti_thread_flag+0xf/0xf [ 63.596281] [] ? sysfs_warn_dup+0x7b/0xa0 [ 63.602421] [] __warn+0x18d/0x1b0 [ 63.607539] [] warn_slowpath_fmt+0x92/0xb0 [ 63.613579] [] ? __warn+0x1b0/0x1b0 [ 63.618837] [] ? kernfs_path_from_node+0x4a/0x60 [ 63.625236] [] sysfs_warn_dup+0x7b/0xa0 [ 63.630872] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 63.637966] [] sysfs_create_link+0x43/0xb0 [ 63.643827] [] device_add+0x689/0x1360 [ 63.649441] [] ? kfree_const+0x1d/0x20 [ 63.655080] [] ? device_private_init+0x180/0x180 [ 63.661511] [] ? kfree_const+0x1d/0x20 [ 63.667204] [] ? kobject_set_name_vargs+0xb4/0x130 [ 63.673781] [] device_create_groups_vargs+0x1c8/0x220 [ 63.680831] [] device_create+0x88/0xa0 [ 63.686346] [] ? device_create_vargs+0x20/0x20 [ 63.692715] [] ? macvlan_set_mac_address+0x150/0x150 [ 63.699453] [] macvtap_device_event+0x1c4/0x2a0 [ 63.706107] [] notifier_call_chain+0x8b/0x170 [ 63.712237] [] raw_notifier_call_chain+0x11/0x20 [ 63.718624] [] call_netdevice_notifiers_info+0x47/0x80 [ 63.725895] [] register_netdevice+0x88a/0xce0 [ 63.732150] [] ? netdev_change_features+0x80/0x80 [ 63.738632] [] ? dev_get_nest_level+0x10c/0x1a0 [ 63.744942] [] macvlan_common_newlink+0x8b9/0x1090 [ 63.751513] [] macvtap_newlink+0xbf/0x110 [ 63.757311] [] ? __netlink_ns_capable+0xc7/0xf0 [ 63.763617] [] rtnl_newlink+0xd4b/0x1230 [ 63.769323] [] ? rtnl_link_ops_get+0x5d/0x90 [ 63.775713] [] ? rtnl_newlink+0x319/0x1230 [ 63.781774] [] ? save_stack+0xb5/0xd0 [ 63.787216] [] ? sock_sendmsg+0xb5/0xf0 [ 63.792843] [] ? rtnl_setlink+0x2f0/0x2f0 [ 63.798623] [] ? do_fast_syscall_32+0x324/0xa70 [ 63.804932] [] ? entry_SYSENTER_compat+0x54/0x63 [ 63.811345] [] ? debug_check_no_obj_freed+0x154/0x780 [ 63.818177] [] ? debug_check_no_obj_freed+0x48b/0x780 [ 63.825286] [] ? mark_held_locks+0xc8/0x120 [ 63.831272] [] ? __mmdrop+0x125/0x210 [ 63.836868] [] ? __netlink_ns_capable+0xc7/0xf0 [ 63.843177] [] rtnetlink_rcv_msg+0x222/0x680 [ 63.849228] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 63.856070] [] ? rtnetlink_rcv+0x30/0x30 [ 63.861774] [] ? mutex_lock_nested+0x638/0xb30 [ 63.867991] [] ? rtnetlink_rcv+0x16/0x30 [ 63.873701] [] ? netlink_lookup+0xd4/0x630 [ 63.879576] [] netlink_rcv_skb+0x242/0x350 [ 63.885561] [] ? rtnetlink_rcv+0x30/0x30 [ 63.891260] [] rtnetlink_rcv+0x25/0x30 [ 63.896794] [] netlink_unicast+0x455/0x660 [ 63.902656] [] ? netlink_unicast+0x3b5/0x660 [ 63.908873] [] ? netlink_attachskb+0x730/0x730 [ 63.915290] [] netlink_sendmsg+0x893/0xb40 [ 63.921279] [] ? netlink_unicast+0x660/0x660 [ 63.927458] [] ? __might_fault+0xf1/0x1b0 [ 63.933244] [] ? netlink_unicast+0x660/0x660 [ 63.939288] [] sock_sendmsg+0xb5/0xf0 [ 63.944726] [] SYSC_sendto+0x1c9/0x300 [ 63.950247] [] ? SYSC_connect+0x2a0/0x2a0 [ 63.956134] [] ? _raw_spin_unlock_irqrestore+0xa6/0xd0 [ 63.963047] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 63.970041] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 63.976801] [] ? __might_fault+0xf1/0x1b0 [ 63.982590] [] SyS_sendto+0x9/0x10 [ 63.987769] [] compat_SyS_socketcall+0x482/0x7d0 [ 63.994167] [] ? compat_SyS_recvmmsg+0x120/0x120 [ 64.000568] [] ? ___might_sleep+0x331/0x440 [ 64.009728] [] ? task_work_run+0x14a/0x200 [ 64.015603] [] do_fast_syscall_32+0x324/0xa70 [ 64.021722] [] ? trace_hardirqs_off_thunk+0x1b/0x1d [ 64.028365] [] entry_SYSENTER_compat+0x54/0x63 [ 64.036574] Kernel Offset: disabled