[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.482270] audit_printk_skb: 24 callbacks suppressed [ 34.487495] audit: type=1800 audit(1579674746.909:29): pid=6804 uid=0 auid=4294967295 ses=4294967295 subj=_ op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 34.510735] audit: type=1800 audit(1579674746.939:30): pid=6804 uid=0 auid=4294967295 ses=4294967295 subj=_ op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 42.787058] IPVS: Creating netns size=2712 id=1 [ 42.792206] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. 2020/01/22 06:32:42 parsed 1 programs 2020/01/22 06:32:43 executed programs: 0 [ 50.653995] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 50.675138] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 50.676041] IPVS: Creating netns size=2712 id=2 [ 50.676162] IPVS: ftp: loaded support on port[0] = 21 [ 50.695635] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 50.704262] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 50.718174] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 50.726867] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 50.796624] IPVS: Creating netns size=2712 id=3 [ 50.801538] IPVS: ftp: loaded support on port[0] = 21 [ 50.949892] chnl_net:caif_netlink_parms(): no params data found [ 50.958589] IPVS: Creating netns size=2712 id=4 [ 50.963468] IPVS: ftp: loaded support on port[0] = 21 [ 51.150869] chnl_net:caif_netlink_parms(): no params data found [ 51.177649] IPVS: Creating netns size=2712 id=5 [ 51.195765] IPVS: ftp: loaded support on port[0] = 21 [ 51.375942] bridge0: port 1(bridge_slave_0) entered blocking state [ 51.383099] bridge0: port 1(bridge_slave_0) entered disabled state [ 51.392499] device bridge_slave_0 entered promiscuous mode [ 51.429695] bridge0: port 2(bridge_slave_1) entered blocking state [ 51.436236] bridge0: port 2(bridge_slave_1) entered disabled state [ 51.445556] device bridge_slave_1 entered promiscuous mode [ 51.526575] bridge0: port 1(bridge_slave_0) entered blocking state [ 51.533567] bridge0: port 1(bridge_slave_0) entered disabled state [ 51.542914] device bridge_slave_0 entered promiscuous mode [ 51.567212] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 51.575452] bridge0: port 2(bridge_slave_1) entered blocking state [ 51.581951] bridge0: port 2(bridge_slave_1) entered disabled state [ 51.591381] device bridge_slave_1 entered promiscuous mode [ 51.603801] chnl_net:caif_netlink_parms(): no params data found [ 51.620957] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 51.662841] IPVS: Creating netns size=2712 id=6 [ 51.667687] IPVS: ftp: loaded support on port[0] = 21 [ 51.722290] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 51.788810] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 52.057927] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 52.065717] bridge0: port 1(bridge_slave_0) entered blocking state [ 52.072388] bridge0: port 1(bridge_slave_0) entered disabled state [ 52.081564] device bridge_slave_0 entered promiscuous mode [ 52.117034] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 52.124895] bridge0: port 2(bridge_slave_1) entered blocking state [ 52.131954] bridge0: port 2(bridge_slave_1) entered disabled state [ 52.141021] device bridge_slave_1 entered promiscuous mode [ 52.192306] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 52.244307] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 52.255239] IPVS: Creating netns size=2712 id=7 [ 52.260273] IPVS: ftp: loaded support on port[0] = 21 [ 52.280915] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 52.322236] chnl_net:caif_netlink_parms(): no params data found [ 52.339444] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 52.348373] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 52.403840] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 52.526461] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 52.563287] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 52.591948] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 52.671218] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 52.793168] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 52.886576] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 52.900862] bridge0: port 1(bridge_slave_0) entered blocking state [ 52.907280] bridge0: port 1(bridge_slave_0) entered disabled state [ 52.916472] device bridge_slave_0 entered promiscuous mode [ 52.981870] bridge0: port 2(bridge_slave_1) entered blocking state [ 52.988286] bridge0: port 2(bridge_slave_1) entered disabled state [ 52.997632] device bridge_slave_1 entered promiscuous mode [ 53.025872] chnl_net:caif_netlink_parms(): no params data found [ 53.184884] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 53.195396] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 53.237976] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 53.247719] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 53.586651] chnl_net:caif_netlink_parms(): no params data found [ 53.624274] bridge0: port 1(bridge_slave_0) entered blocking state [ 53.630974] bridge0: port 1(bridge_slave_0) entered disabled state [ 53.640265] device bridge_slave_0 entered promiscuous mode [ 53.706408] bridge0: port 2(bridge_slave_1) entered blocking state [ 53.712961] bridge0: port 2(bridge_slave_1) entered disabled state [ 53.722270] device bridge_slave_1 entered promiscuous mode [ 53.816402] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 53.931860] ------------[ cut here ]------------ [ 53.936757] WARNING: CPU: 0 PID: 7059 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 53.944631] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 53.951701] Kernel panic - not syncing: panic_on_warn set ... [ 53.951701] [ 53.959050] CPU: 0 PID: 7059 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 53.966603] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.975996] 1ffffffff0dd577e ffff8800b9ca6fb0 ffffffff82c7d0a6 ffffffff85e83680 [ 53.984109] ffff8800b9ca7088 ffffffff85f2e180 ffffffff8192854b ffff8800b9ca7078 [ 53.992593] ffffffff8161275e 0000000041b58ab3 ffffffff86afc32f ffffffff816125af [ 54.000701] Call Trace: [ 54.003277] [] dump_stack+0xe6/0x120 [ 54.008627] [] ? sysfs_warn_dup+0x7b/0xa0 [ 54.014436] [] panic+0x1af/0x348 [ 54.019441] [] ? set_ti_thread_flag+0xf/0xf [ 54.025396] [] ? sysfs_warn_dup+0x7b/0xa0 [ 54.031174] [] __warn+0x18d/0x1b0 [ 54.036258] [] warn_slowpath_fmt+0x92/0xb0 [ 54.042129] [] ? __warn+0x1b0/0x1b0 [ 54.047389] [] ? kernfs_path_from_node+0x4a/0x60 [ 54.053781] [] sysfs_warn_dup+0x7b/0xa0 [ 54.059493] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 54.066615] [] sysfs_create_link+0x43/0xb0 [ 54.072487] [] device_add+0x689/0x1360 [ 54.078009] [] ? device_private_init+0x180/0x180 [ 54.084402] [] ? kfree_const+0x1d/0x20 [ 54.089925] [] ? kobject_set_name_vargs+0xb4/0x130 [ 54.096524] [] device_create_groups_vargs+0x1c8/0x220 [ 54.103460] [] device_create+0x88/0xa0 [ 54.109090] [] ? device_create_vargs+0x20/0x20 [ 54.115315] [] ? macvlan_set_mac_address+0x150/0x150 [ 54.122053] [] macvtap_device_event+0x1c4/0x2a0 [ 54.128395] [] notifier_call_chain+0x8b/0x170 [ 54.134649] [] raw_notifier_call_chain+0x11/0x20 [ 54.141037] [] call_netdevice_notifiers_info+0x47/0x80 [ 54.148122] [] register_netdevice+0x88a/0xce0 [ 54.154252] [] ? netdev_change_features+0x80/0x80 [ 54.160747] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 54.167405] [] ? dev_get_nest_level+0x10c/0x1a0 [ 54.174347] [] macvlan_common_newlink+0x8b9/0x1090 [ 54.181055] [] macvtap_newlink+0xbf/0x110 [ 54.186829] [] ? __netlink_ns_capable+0xc7/0xf0 [ 54.193252] [] rtnl_newlink+0xd4b/0x1230 [ 54.198951] [] ? rtnl_link_ops_get+0x5d/0x90 [ 54.204997] [] ? rtnl_newlink+0x319/0x1230 [ 54.210909] [] ? __module_text_address+0x13/0x150 [ 54.217391] [] ? is_module_text_address+0x2a/0x50 [ 54.223871] [] ? rtnl_setlink+0x2f0/0x2f0 [ 54.229748] [] ? __module_text_address+0x13/0x150 [ 54.236256] [] ? print_context_stack+0x7b/0xc0 [ 54.242472] [] ? dump_trace+0x127/0x320 [ 54.248137] [] ? __netlink_ns_capable+0xc7/0xf0 [ 54.254530] [] rtnetlink_rcv_msg+0x222/0x680 [ 54.260628] [] ? rtnetlink_rcv+0x30/0x30 [ 54.266329] [] ? mutex_lock_nested+0x638/0xb30 [ 54.272547] [] ? rtnetlink_rcv+0x16/0x30 [ 54.278247] [] ? netlink_lookup+0xd4/0x630 [ 54.284130] [] netlink_rcv_skb+0x242/0x350 [ 54.290086] [] ? rtnetlink_rcv+0x30/0x30 [ 54.295790] [] rtnetlink_rcv+0x25/0x30 [ 54.301328] [] netlink_unicast+0x455/0x660 [ 54.307189] [] ? netlink_unicast+0x3b5/0x660 [ 54.313235] [] ? netlink_attachskb+0x730/0x730 [ 54.320260] [] netlink_sendmsg+0x893/0xb40 [ 54.326156] [] ? netlink_unicast+0x660/0x660 [ 54.332250] [] ? __might_fault+0xf1/0x1b0 [ 54.338036] [] ? security_socket_sendmsg+0x6a/0xa0 [ 54.344728] [] ? netlink_unicast+0x660/0x660 [ 54.350863] [] sock_sendmsg+0xb5/0xf0 [ 54.356353] [] SYSC_sendto+0x1c9/0x300 [ 54.361922] [] ? SYSC_connect+0x2a0/0x2a0 [ 54.367717] [] ? mnt_get_count+0x1c0/0x1c0 [ 54.373586] [] ? mntput_no_expire+0xb1/0x600 [ 54.379671] [] ? mntput_no_expire+0xce/0x600 [ 54.385712] [] ? mnt_get_count+0x1c0/0x1c0 [ 54.391587] [] ? mntput+0x52/0x70 [ 54.396689] [] ? ___might_sleep+0x331/0x440 [ 54.402646] [] ? trace_hardirqs_off+0xd/0x10 [ 54.408688] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 54.415173] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 54.421907] [] SyS_sendto+0x9/0x10 [ 54.427086] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 54.435392] Kernel Offset: disabled