[ 40.530040] audit: type=1800 audit(1581634159.850:25): pid=7310 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.551519] audit: type=1800 audit(1581634159.870:26): pid=7310 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.575599] audit: type=1800 audit(1581634159.900:27): pid=7310 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: [ 53.280050] IPVS: Creating netns size=2712 id=1 [ 53.285263] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. 2020/02/13 22:49:40 parsed 1 programs 2020/02/13 22:49:40 executed programs: 0 [ 61.648399] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 61.660506] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 61.669528] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 61.678056] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 61.686275] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 61.694536] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 61.713669] IPVS: Creating netns size=2712 id=2 [ 61.718446] IPVS: ftp: loaded support on port[0] = 21 [ 61.793089] IPVS: Creating netns size=2712 id=3 [ 61.798349] IPVS: ftp: loaded support on port[0] = 21 [ 61.933786] chnl_net:caif_netlink_parms(): no params data found [ 61.959720] IPVS: Creating netns size=2712 id=4 [ 61.964784] IPVS: ftp: loaded support on port[0] = 21 [ 62.112153] IPVS: Creating netns size=2712 id=5 [ 62.126341] IPVS: ftp: loaded support on port[0] = 21 [ 62.257585] chnl_net:caif_netlink_parms(): no params data found [ 62.376524] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.383820] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.393955] device bridge_slave_0 entered promiscuous mode [ 62.433317] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.439882] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.449240] device bridge_slave_1 entered promiscuous mode [ 62.539667] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.550705] IPVS: Creating netns size=2712 id=6 [ 62.553656] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.564404] IPVS: ftp: loaded support on port[0] = 21 [ 62.586549] chnl_net:caif_netlink_parms(): no params data found [ 62.853454] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 62.919036] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 62.932953] IPVS: Creating netns size=2712 id=7 [ 62.938707] IPVS: ftp: loaded support on port[0] = 21 [ 62.982501] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.019599] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.026146] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.035864] device bridge_slave_0 entered promiscuous mode [ 63.052760] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.070236] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.080212] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.089691] device bridge_slave_1 entered promiscuous mode [ 63.096432] chnl_net:caif_netlink_parms(): no params data found [ 63.312636] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.352780] chnl_net:caif_netlink_parms(): no params data found [ 63.368899] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.398909] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.435144] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.441649] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.451049] device bridge_slave_0 entered promiscuous mode [ 63.458794] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.497220] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.504476] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.513985] device bridge_slave_1 entered promiscuous mode [ 63.664965] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.727163] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.055587] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.062160] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.071545] device bridge_slave_0 entered promiscuous mode [ 64.090078] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 64.138410] chnl_net:caif_netlink_parms(): no params data found [ 64.152991] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.159816] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.168937] device bridge_slave_1 entered promiscuous mode [ 64.186854] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 64.194406] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.200941] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.210425] device bridge_slave_0 entered promiscuous mode [ 64.296076] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.302586] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.312123] device bridge_slave_1 entered promiscuous mode [ 64.437124] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 64.462325] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 64.498991] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 64.507966] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 64.527933] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.587280] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 64.631194] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.700241] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.823961] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.831682] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.875802] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 64.950312] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 65.046496] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 65.091420] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.099198] bridge0: port 1(bridge_slave_0) entered disabled state [ 65.108793] device bridge_slave_0 entered promiscuous mode [ 65.159882] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.166828] bridge0: port 2(bridge_slave_1) entered disabled state [ 65.176534] device bridge_slave_1 entered promiscuous mode [ 65.216660] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 65.269898] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 65.358567] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 65.367448] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 65.409836] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 65.418413] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 65.574814] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 65.582325] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 65.599353] ------------[ cut here ]------------ [ 65.604264] WARNING: CPU: 0 PID: 7567 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 65.612050] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 65.619189] Kernel panic - not syncing: panic_on_warn set ... [ 65.619189] [ 65.626546] CPU: 0 PID: 7567 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 65.634542] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.643900] 1ffffffff0d95756 ffff8800b3d46fb0 ffffffff82c74fc6 ffffffff85c81040 [ 65.652170] ffff8800b3d47088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b3d47078 [ 65.661010] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 65.669163] Call Trace: [ 65.671789] [] dump_stack+0xe6/0x120 [ 65.677237] [] ? sysfs_warn_dup+0x7b/0xa0 [ 65.683017] [] panic+0x1af/0x348 [ 65.688027] [] ? set_ti_thread_flag+0xf/0xf [ 65.694334] [] ? sysfs_warn_dup+0x7b/0xa0 [ 65.700152] [] __warn+0x18d/0x1b0 [ 65.705291] [] warn_slowpath_fmt+0x92/0xb0 [ 65.711158] [] ? __warn+0x1b0/0x1b0 [ 65.716533] [] ? kernfs_path_from_node+0x4a/0x60 [ 65.723073] [] sysfs_warn_dup+0x7b/0xa0 [ 65.728811] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 65.737036] [] sysfs_create_link+0x43/0xb0 [ 65.742954] [] device_add+0x689/0x1360 [ 65.748497] [] ? kfree_const+0x1d/0x20 [ 65.754659] [] ? device_private_init+0x180/0x180 [ 65.761060] [] ? kfree_const+0x1d/0x20 [ 65.766582] [] ? kobject_set_name_vargs+0xb4/0x130 [ 65.773151] [] device_create_groups_vargs+0x1c8/0x220 [ 65.780085] [] device_create+0x88/0xa0 [ 65.785609] [] ? device_create_vargs+0x20/0x20 [ 65.793311] [] ? macvlan_set_mac_address+0x150/0x150 [ 65.800194] [] macvtap_device_event+0x1c4/0x2a0 [ 65.806519] [] notifier_call_chain+0x8b/0x170 [ 65.812735] [] raw_notifier_call_chain+0x11/0x20 [ 65.819257] [] call_netdevice_notifiers_info+0x47/0x80 [ 65.826202] [] register_netdevice+0x88a/0xce0 [ 65.832333] [] ? netdev_change_features+0x80/0x80 [ 65.838819] [] ? dev_get_nest_level+0x10c/0x1a0 [ 65.845226] [] macvlan_common_newlink+0x8b9/0x1090 [ 65.851895] [] macvtap_newlink+0xbf/0x110 [ 65.857724] [] ? __netlink_ns_capable+0xc7/0xf0 [ 65.864033] [] rtnl_newlink+0xd4b/0x1230 [ 65.869798] [] ? rtnl_link_ops_get+0x5d/0x90 [ 65.875846] [] ? rtnl_newlink+0x319/0x1230 [ 65.881921] [] ? load_balance+0xc76/0x1ea0 [ 65.887955] [] ? rtnl_setlink+0x2f0/0x2f0 [ 65.893836] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 65.900633] [] ? __lock_acquire+0x1985/0x5560 [ 65.906888] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 65.913887] [] ? set_next_entity+0x301/0x410 [ 65.920131] [] ? __netlink_ns_capable+0xc7/0xf0 [ 65.926562] [] rtnetlink_rcv_msg+0x222/0x680 [ 65.932725] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 65.939607] [] ? rtnetlink_rcv+0x30/0x30 [ 65.945310] [] ? mutex_lock_nested+0x638/0xb30 [ 65.951581] [] ? rtnetlink_rcv+0x16/0x30 [ 65.957278] [] ? netlink_lookup+0xd4/0x630 [ 65.963282] [] netlink_rcv_skb+0x242/0x350 [ 65.969202] [] ? rtnetlink_rcv+0x30/0x30 [ 65.974895] [] rtnetlink_rcv+0x25/0x30 [ 65.980422] [] netlink_unicast+0x455/0x660 [ 65.986479] [] ? netlink_unicast+0x3b5/0x660 [ 65.992531] [] ? netlink_attachskb+0x730/0x730 [ 65.998754] [] netlink_sendmsg+0x893/0xb40 [ 66.004691] [] ? netlink_unicast+0x660/0x660 [ 66.010845] [] ? __might_fault+0xf1/0x1b0 [ 66.016672] [] ? netlink_unicast+0x660/0x660 [ 66.022917] [] sock_sendmsg+0xb5/0xf0 [ 66.028354] [] SYSC_sendto+0x1c9/0x300 [ 66.034064] [] ? SYSC_connect+0x2a0/0x2a0 [ 66.039849] [] ? mntput_no_expire+0xb1/0x600 [ 66.045892] [] ? mntput_no_expire+0xce/0x600 [ 66.052046] [] ? mnt_get_count+0x1c0/0x1c0 [ 66.058023] [] ? mntput+0x52/0x70 [ 66.063216] [] ? ___might_sleep+0x331/0x440 [ 66.069291] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 66.076119] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 66.082691] [] SyS_sendto+0x9/0x10 [ 66.087893] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 66.096213] Kernel Offset: disabled