[ 37.794867] audit: type=1800 audit(1583817906.537:26): pid=7122 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.818667] audit: type=1800 audit(1583817906.557:27): pid=7122 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.844387] audit: type=1800 audit(1583817906.587:28): pid=7122 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 49.710931] IPVS: Creating netns size=2712 id=1 [ 49.715769] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.3' (ECDSA) to the list of known hosts. 2020/03/10 05:25:26 parsed 1 programs 2020/03/10 05:25:26 executed programs: 0 [ 58.006953] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 58.019109] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 58.026967] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 58.035477] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 58.043535] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 58.051319] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 58.069323] IPVS: Creating netns size=2712 id=2 [ 58.074133] IPVS: ftp: loaded support on port[0] = 21 [ 58.145212] IPVS: Creating netns size=2712 id=3 [ 58.150376] IPVS: ftp: loaded support on port[0] = 21 [ 58.281637] chnl_net:caif_netlink_parms(): no params data found [ 58.307593] IPVS: Creating netns size=2712 id=4 [ 58.312460] IPVS: ftp: loaded support on port[0] = 21 [ 58.505714] IPVS: Creating netns size=2712 id=5 [ 58.510484] IPVS: ftp: loaded support on port[0] = 21 [ 58.575263] chnl_net:caif_netlink_parms(): no params data found [ 58.655205] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.662110] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.671742] device bridge_slave_0 entered promiscuous mode [ 58.697635] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.704315] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.713725] device bridge_slave_1 entered promiscuous mode [ 58.861703] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.885690] IPVS: Creating netns size=2712 id=6 [ 58.890528] IPVS: ftp: loaded support on port[0] = 21 [ 58.923192] chnl_net:caif_netlink_parms(): no params data found [ 58.936072] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.198038] chnl_net:caif_netlink_parms(): no params data found [ 59.261442] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 59.276261] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.282829] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.291766] device bridge_slave_0 entered promiscuous mode [ 59.299675] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.306808] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.316392] device bridge_slave_1 entered promiscuous mode [ 59.323756] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 59.367070] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.375955] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.496998] IPVS: Creating netns size=2712 id=7 [ 59.501846] IPVS: ftp: loaded support on port[0] = 21 [ 59.506500] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.560591] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.613395] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.619907] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.629572] device bridge_slave_0 entered promiscuous mode [ 59.637509] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.701797] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.708959] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.718099] device bridge_slave_1 entered promiscuous mode [ 59.725115] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.973588] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.001911] chnl_net:caif_netlink_parms(): no params data found [ 60.062151] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.091232] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.097780] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.107515] device bridge_slave_0 entered promiscuous mode [ 60.158670] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.165332] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.174972] device bridge_slave_1 entered promiscuous mode [ 60.288341] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 60.353768] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.362752] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 60.443124] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.625034] chnl_net:caif_netlink_parms(): no params data found [ 60.668822] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 60.678508] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 60.694237] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 60.704011] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 60.900046] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.906730] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.916444] device bridge_slave_0 entered promiscuous mode [ 60.946101] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.953142] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.965209] device bridge_slave_1 entered promiscuous mode [ 60.981767] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 61.049642] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 61.057109] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 61.100720] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 61.108154] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 61.128756] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.220256] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.299604] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.306264] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.316125] device bridge_slave_0 entered promiscuous mode [ 61.397882] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.405017] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.414513] device bridge_slave_1 entered promiscuous mode [ 61.433412] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 61.494744] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 61.607387] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.676202] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.837756] ------------[ cut here ]------------ [ 61.842899] WARNING: CPU: 1 PID: 7375 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 61.850676] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 61.857717] Kernel panic - not syncing: panic_on_warn set ... [ 61.857717] [ 61.865272] CPU: 1 PID: 7375 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 61.872787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.882133] 1ffffffff0d95756 ffff8800b4a76fb0 ffffffff82c74fc6 ffffffff85c81040 [ 61.890191] ffff8800b4a77088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b4a77078 [ 61.898223] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 61.906250] Call Trace: [ 61.908829] [] dump_stack+0xe6/0x120 [ 61.914816] [] ? sysfs_warn_dup+0x7b/0xa0 [ 61.920639] [] panic+0x1af/0x348 [ 61.925643] [] ? set_ti_thread_flag+0xf/0xf [ 61.931613] [] ? sysfs_warn_dup+0x7b/0xa0 [ 61.938376] [] __warn+0x18d/0x1b0 [ 61.943563] [] warn_slowpath_fmt+0x92/0xb0 [ 61.949424] [] ? __warn+0x1b0/0x1b0 [ 61.954696] [] ? kernfs_path_from_node+0x4a/0x60 [ 61.961509] [] sysfs_warn_dup+0x7b/0xa0 [ 61.967117] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 61.974115] [] sysfs_create_link+0x43/0xb0 [ 61.979986] [] device_add+0x689/0x1360 [ 61.985649] [] ? kfree_const+0x1d/0x20 [ 61.991173] [] ? device_private_init+0x180/0x180 [ 61.997574] [] ? kfree_const+0x1d/0x20 [ 62.003135] [] ? kobject_set_name_vargs+0xb4/0x130 [ 62.009693] [] device_create_groups_vargs+0x1c8/0x220 [ 62.016649] [] device_create+0x88/0xa0 [ 62.022174] [] ? device_create_vargs+0x20/0x20 [ 62.028395] [] ? macvlan_set_mac_address+0x150/0x150 [ 62.035141] [] macvtap_device_event+0x1c4/0x2a0 [ 62.041450] [] notifier_call_chain+0x8b/0x170 [ 62.047696] [] raw_notifier_call_chain+0x11/0x20 [ 62.054114] [] call_netdevice_notifiers_info+0x47/0x80 [ 62.061034] [] register_netdevice+0x88a/0xce0 [ 62.067288] [] ? netdev_change_features+0x80/0x80 [ 62.073764] [] ? dev_get_nest_level+0x10c/0x1a0 [ 62.080215] [] macvlan_common_newlink+0x8b9/0x1090 [ 62.086778] [] macvtap_newlink+0xbf/0x110 [ 62.092594] [] ? __netlink_ns_capable+0xc7/0xf0 [ 62.098907] [] rtnl_newlink+0xd4b/0x1230 [ 62.104614] [] ? rtnl_link_ops_get+0x5d/0x90 [ 62.110656] [] ? rtnl_newlink+0x319/0x1230 [ 62.116561] [] ? __module_text_address+0x13/0x150 [ 62.123036] [] ? is_module_text_address+0x2a/0x50 [ 62.129647] [] ? rtnl_setlink+0x2f0/0x2f0 [ 62.135443] [] ? __module_text_address+0x13/0x150 [ 62.141946] [] ? print_context_stack+0x7b/0xc0 [ 62.148175] [] ? __lock_acquire+0xca1/0x5560 [ 62.154924] [] ? __netlink_ns_capable+0xc7/0xf0 [ 62.161218] [] rtnetlink_rcv_msg+0x222/0x680 [ 62.167266] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 62.174176] [] ? rtnetlink_rcv+0x30/0x30 [ 62.179890] [] ? mutex_lock_nested+0x638/0xb30 [ 62.186119] [] ? rtnetlink_rcv+0x16/0x30 [ 62.191805] [] ? netlink_lookup+0xd4/0x630 [ 62.197668] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 62.204417] [] netlink_rcv_skb+0x242/0x350 [ 62.210331] [] ? rtnetlink_rcv+0x30/0x30 [ 62.216037] [] rtnetlink_rcv+0x25/0x30 [ 62.221571] [] netlink_unicast+0x455/0x660 [ 62.228211] [] ? netlink_unicast+0x3b5/0x660 [ 62.234253] [] ? netlink_attachskb+0x730/0x730 [ 62.240620] [] netlink_sendmsg+0x893/0xb40 [ 62.246581] [] ? netlink_unicast+0x660/0x660 [ 62.252627] [] ? __might_fault+0xf1/0x1b0 [ 62.258421] [] ? netlink_unicast+0x660/0x660 [ 62.264471] [] sock_sendmsg+0xb5/0xf0 [ 62.269899] [] SYSC_sendto+0x1c9/0x300 [ 62.275775] [] ? SYSC_connect+0x2a0/0x2a0 [ 62.281573] [] ? mntput_no_expire+0xb1/0x600 [ 62.288669] [] ? mntput_no_expire+0xce/0x600 [ 62.295309] [] ? mnt_get_count+0x1c0/0x1c0 [ 62.301172] [] ? mntput+0x52/0x70 [ 62.306261] [] ? ___might_sleep+0x331/0x440 [ 62.312249] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 62.319921] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 62.326493] [] SyS_sendto+0x9/0x10 [ 62.331673] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 62.340115] Kernel Offset: disabled