[ 40.057181] audit: type=1800 audit(1582501556.814:25): pid=7269 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.079336] audit: type=1800 audit(1582501556.834:26): pid=7269 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.102895] audit: type=1800 audit(1582501556.854:27): pid=7269 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 52.966462] IPVS: Creating netns size=2712 id=1 [ 52.972040] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.56' (ECDSA) to the list of known hosts. 2020/02/23 23:46:17 parsed 1 programs 2020/02/23 23:46:18 executed programs: 0 [ 61.322232] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 61.334296] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 61.343027] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 61.352015] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 61.360532] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 61.368516] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 61.387206] IPVS: Creating netns size=2712 id=2 [ 61.392154] IPVS: ftp: loaded support on port[0] = 21 [ 61.465739] IPVS: Creating netns size=2712 id=3 [ 61.470768] IPVS: ftp: loaded support on port[0] = 21 [ 61.612951] IPVS: Creating netns size=2712 id=4 [ 61.617867] IPVS: ftp: loaded support on port[0] = 21 [ 61.624201] chnl_net:caif_netlink_parms(): no params data found [ 61.840627] IPVS: Creating netns size=2712 id=5 [ 61.846164] IPVS: ftp: loaded support on port[0] = 21 [ 61.914949] chnl_net:caif_netlink_parms(): no params data found [ 62.082471] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.089465] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.099067] device bridge_slave_0 entered promiscuous mode [ 62.132738] chnl_net:caif_netlink_parms(): no params data found [ 62.148258] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.154781] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.164354] device bridge_slave_1 entered promiscuous mode [ 62.218950] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.238301] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.284876] IPVS: Creating netns size=2712 id=6 [ 62.295057] IPVS: ftp: loaded support on port[0] = 21 [ 62.602158] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 62.611351] chnl_net:caif_netlink_parms(): no params data found [ 62.633166] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.639897] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.649648] device bridge_slave_0 entered promiscuous mode [ 62.657716] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 62.691770] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.698953] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.708353] device bridge_slave_1 entered promiscuous mode [ 62.715455] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.770203] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.798007] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.804594] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.814145] device bridge_slave_0 entered promiscuous mode [ 62.877083] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.883528] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.899554] device bridge_slave_1 entered promiscuous mode [ 62.920317] IPVS: Creating netns size=2712 id=7 [ 62.925181] IPVS: ftp: loaded support on port[0] = 21 [ 62.948380] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.018116] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.085938] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.117273] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.152108] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.182253] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.512274] chnl_net:caif_netlink_parms(): no params data found [ 63.639343] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.646277] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.657933] device bridge_slave_0 entered promiscuous mode [ 63.666610] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.674833] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.717091] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.723522] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.733076] device bridge_slave_1 entered promiscuous mode [ 63.787583] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.860743] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.949394] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.958411] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.017767] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.026838] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.140255] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.148136] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.277565] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 64.388822] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.395395] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.406362] device bridge_slave_0 entered promiscuous mode [ 64.435851] chnl_net:caif_netlink_parms(): no params data found [ 64.472441] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.478999] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.488693] device bridge_slave_1 entered promiscuous mode [ 64.632156] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 64.670727] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.725218] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 64.790900] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 64.844400] ------------[ cut here ]------------ [ 64.849398] WARNING: CPU: 0 PID: 7522 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 64.857466] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 64.865559] Kernel panic - not syncing: panic_on_warn set ... [ 64.865559] [ 64.874544] CPU: 0 PID: 7522 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 64.882178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.891528] 1ffffffff0d95756 ffff8800b6baefb0 ffffffff82c74fc6 ffffffff85c81040 [ 64.899686] ffff8800b6baf088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b6baf078 [ 64.907806] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 64.915926] Call Trace: [ 64.918615] [] dump_stack+0xe6/0x120 [ 64.924327] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.930112] [] panic+0x1af/0x348 [ 64.935226] [] ? set_ti_thread_flag+0xf/0xf [ 64.941206] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.947025] [] __warn+0x18d/0x1b0 [ 64.952127] [] warn_slowpath_fmt+0x92/0xb0 [ 64.958021] [] ? __warn+0x1b0/0x1b0 [ 64.963427] [] ? kernfs_path_from_node+0x4a/0x60 [ 64.970089] [] sysfs_warn_dup+0x7b/0xa0 [ 64.976052] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 64.983230] [] sysfs_create_link+0x43/0xb0 [ 64.989119] [] device_add+0x689/0x1360 [ 64.994647] [] ? kfree_const+0x1d/0x20 [ 65.000193] [] ? device_private_init+0x180/0x180 [ 65.006808] [] ? kfree_const+0x1d/0x20 [ 65.012336] [] ? kobject_set_name_vargs+0xb4/0x130 [ 65.018908] [] device_create_groups_vargs+0x1c8/0x220 [ 65.026024] [] device_create+0x88/0xa0 [ 65.031541] [] ? device_create_vargs+0x20/0x20 [ 65.037763] [] ? macvlan_set_mac_address+0x150/0x150 [ 65.044557] [] macvtap_device_event+0x1c4/0x2a0 [ 65.051024] [] notifier_call_chain+0x8b/0x170 [ 65.057722] [] raw_notifier_call_chain+0x11/0x20 [ 65.064151] [] call_netdevice_notifiers_info+0x47/0x80 [ 65.071197] [] register_netdevice+0x88a/0xce0 [ 65.077339] [] ? netdev_change_features+0x80/0x80 [ 65.083823] [] ? dev_get_nest_level+0x10c/0x1a0 [ 65.090146] [] macvlan_common_newlink+0x8b9/0x1090 [ 65.096746] [] macvtap_newlink+0xbf/0x110 [ 65.102592] [] ? __netlink_ns_capable+0xc7/0xf0 [ 65.109000] [] rtnl_newlink+0xd4b/0x1230 [ 65.115242] [] ? rtnl_link_ops_get+0x5d/0x90 [ 65.121312] [] ? rtnl_newlink+0x319/0x1230 [ 65.127194] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 65.134361] [] ? rtnl_setlink+0x2f0/0x2f0 [ 65.140268] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 65.147012] [] ? __lock_acquire+0x1985/0x5560 [ 65.153210] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 65.160219] [] ? __netlink_ns_capable+0xc7/0xf0 [ 65.166569] [] rtnetlink_rcv_msg+0x222/0x680 [ 65.172613] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 65.179692] [] ? rtnetlink_rcv+0x30/0x30 [ 65.185404] [] ? mutex_lock_nested+0x638/0xb30 [ 65.191624] [] ? rtnetlink_rcv+0x16/0x30 [ 65.197321] [] ? netlink_lookup+0xd4/0x630 [ 65.203414] [] netlink_rcv_skb+0x242/0x350 [ 65.209294] [] ? rtnetlink_rcv+0x30/0x30 [ 65.214984] [] rtnetlink_rcv+0x25/0x30 [ 65.220538] [] netlink_unicast+0x455/0x660 [ 65.226403] [] ? netlink_unicast+0x3b5/0x660 [ 65.232469] [] ? netlink_attachskb+0x730/0x730 [ 65.238692] [] netlink_sendmsg+0x893/0xb40 [ 65.244576] [] ? netlink_unicast+0x660/0x660 [ 65.250632] [] ? __might_fault+0xf1/0x1b0 [ 65.256440] [] ? netlink_unicast+0x660/0x660 [ 65.262508] [] sock_sendmsg+0xb5/0xf0 [ 65.267955] [] SYSC_sendto+0x1c9/0x300 [ 65.273503] [] ? SYSC_connect+0x2a0/0x2a0 [ 65.279290] [] ? mntput_no_expire+0xb1/0x600 [ 65.285348] [] ? mntput_no_expire+0xce/0x600 [ 65.291394] [] ? mnt_get_count+0x1c0/0x1c0 [ 65.297278] [] ? mntput+0x52/0x70 [ 65.302492] [] ? ___might_sleep+0x331/0x440 [ 65.308499] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 65.315332] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 65.321993] [] SyS_sendto+0x9/0x10 [ 65.327210] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 65.335537] Kernel Offset: disabled