[ 39.874080] audit: type=1800 audit(1584456215.707:25): pid=7276 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.895617] audit: type=1800 audit(1584456215.727:26): pid=7276 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.921839] audit: type=1800 audit(1584456215.757:27): pid=7276 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: [ 52.385547] IPVS: Creating netns size=2712 id=1 [ 52.390560] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.15.200' (ECDSA) to the list of known hosts. 2020/03/17 14:43:56 parsed 1 programs 2020/03/17 14:43:56 executed programs: 0 [ 60.741590] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 60.753899] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 60.762020] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 60.770688] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 60.779377] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 60.787604] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 60.806560] IPVS: Creating netns size=2712 id=2 [ 60.811428] IPVS: ftp: loaded support on port[0] = 21 [ 60.883957] IPVS: Creating netns size=2712 id=3 [ 60.888926] IPVS: ftp: loaded support on port[0] = 21 [ 61.024244] chnl_net:caif_netlink_parms(): no params data found [ 61.065502] IPVS: Creating netns size=2712 id=4 [ 61.071533] IPVS: ftp: loaded support on port[0] = 21 [ 61.276340] IPVS: Creating netns size=2712 id=5 [ 61.282128] IPVS: ftp: loaded support on port[0] = 21 [ 61.311416] chnl_net:caif_netlink_parms(): no params data found [ 61.389693] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.396471] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.405934] device bridge_slave_0 entered promiscuous mode [ 61.430134] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.436608] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.446430] device bridge_slave_1 entered promiscuous mode [ 61.552893] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.564261] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.695142] IPVS: Creating netns size=2712 id=6 [ 61.707520] IPVS: ftp: loaded support on port[0] = 21 [ 61.896266] chnl_net:caif_netlink_parms(): no params data found [ 61.911586] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.960468] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 62.004397] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.028648] chnl_net:caif_netlink_parms(): no params data found [ 62.044738] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.051494] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.060689] device bridge_slave_0 entered promiscuous mode [ 62.069490] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.098673] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.105079] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.116541] device bridge_slave_1 entered promiscuous mode [ 62.165907] IPVS: Creating netns size=2712 id=7 [ 62.177765] IPVS: ftp: loaded support on port[0] = 21 [ 62.293542] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.342653] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.402771] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.465689] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 62.557727] chnl_net:caif_netlink_parms(): no params data found [ 62.640475] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.646985] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.657171] device bridge_slave_0 entered promiscuous mode [ 62.717350] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.723858] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.736244] device bridge_slave_1 entered promiscuous mode [ 62.926550] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.935959] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.980983] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.017622] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.046381] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.052975] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.062181] device bridge_slave_0 entered promiscuous mode [ 63.199387] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.205796] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.215440] device bridge_slave_1 entered promiscuous mode [ 63.409134] chnl_net:caif_netlink_parms(): no params data found [ 63.424714] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.432694] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 63.480696] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.510895] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.517884] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.526839] device bridge_slave_0 entered promiscuous mode [ 63.537619] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.546985] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.555628] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.563068] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.569712] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.579188] device bridge_slave_1 entered promiscuous mode [ 63.782780] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.830444] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.940603] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 63.970137] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 63.978823] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.011381] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 64.132167] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 64.286546] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 64.341875] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 64.351521] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.370178] bridge0: port 1(bridge_slave_0) entered blocking state [ 64.376787] bridge0: port 1(bridge_slave_0) entered disabled state [ 64.385854] device bridge_slave_0 entered promiscuous mode [ 64.417883] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 64.436058] bridge0: port 2(bridge_slave_1) entered blocking state [ 64.442701] bridge0: port 2(bridge_slave_1) entered disabled state [ 64.451919] device bridge_slave_1 entered promiscuous mode [ 64.598489] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 64.617540] ------------[ cut here ]------------ [ 64.622447] WARNING: CPU: 0 PID: 7525 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 64.630547] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 64.637600] Kernel panic - not syncing: panic_on_warn set ... [ 64.637600] [ 64.644970] CPU: 0 PID: 7525 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 64.652501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.661848] 1ffffffff0d95756 ffff880129c4efb0 ffffffff82c74fc6 ffffffff85c81040 [ 64.669952] ffff880129c4f088 ffffffff85d2bac0 ffffffff81922ccb ffff880129c4f078 [ 64.678039] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 64.686569] Call Trace: [ 64.689146] [] dump_stack+0xe6/0x120 [ 64.694486] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.700275] [] panic+0x1af/0x348 [ 64.705265] [] ? set_ti_thread_flag+0xf/0xf [ 64.711223] [] ? sysfs_warn_dup+0x7b/0xa0 [ 64.716998] [] __warn+0x18d/0x1b0 [ 64.722078] [] warn_slowpath_fmt+0x92/0xb0 [ 64.727961] [] ? __warn+0x1b0/0x1b0 [ 64.733215] [] ? kernfs_path_from_node+0x4a/0x60 [ 64.739595] [] sysfs_warn_dup+0x7b/0xa0 [ 64.745193] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 64.752194] [] sysfs_create_link+0x43/0xb0 [ 64.758063] [] device_add+0x689/0x1360 [ 64.764025] [] ? kfree_const+0x1d/0x20 [ 64.769536] [] ? device_private_init+0x180/0x180 [ 64.775917] [] ? kfree_const+0x1d/0x20 [ 64.781437] [] ? kobject_set_name_vargs+0xb4/0x130 [ 64.787990] [] device_create_groups_vargs+0x1c8/0x220 [ 64.794866] [] device_create+0x88/0xa0 [ 64.800401] [] ? device_create_vargs+0x20/0x20 [ 64.806650] [] ? macvlan_set_mac_address+0x150/0x150 [ 64.813444] [] macvtap_device_event+0x1c4/0x2a0 [ 64.819764] [] notifier_call_chain+0x8b/0x170 [ 64.825919] [] raw_notifier_call_chain+0x11/0x20 [ 64.832312] [] call_netdevice_notifiers_info+0x47/0x80 [ 64.839222] [] register_netdevice+0x88a/0xce0 [ 64.845369] [] ? netdev_change_features+0x80/0x80 [ 64.851863] [] ? dev_get_nest_level+0x10c/0x1a0 [ 64.858161] [] macvlan_common_newlink+0x8b9/0x1090 [ 64.864735] [] macvtap_newlink+0xbf/0x110 [ 64.870525] [] ? __netlink_ns_capable+0xc7/0xf0 [ 64.876844] [] rtnl_newlink+0xd4b/0x1230 [ 64.882557] [] ? rtnl_link_ops_get+0x5d/0x90 [ 64.888616] [] ? rtnl_newlink+0x319/0x1230 [ 64.894505] [] ? rtnl_setlink+0x2f0/0x2f0 [ 64.900296] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 64.907025] [] ? __lock_acquire+0x1985/0x5560 [ 64.913160] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 64.920170] [] ? __netlink_ns_capable+0xc7/0xf0 [ 64.926464] [] rtnetlink_rcv_msg+0x222/0x680 [ 64.932499] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 64.939315] [] ? rtnetlink_rcv+0x30/0x30 [ 64.945002] [] ? mutex_lock_nested+0x638/0xb30 [ 64.951209] [] ? rtnetlink_rcv+0x16/0x30 [ 64.956907] [] ? netlink_lookup+0xd4/0x630 [ 64.962782] [] netlink_rcv_skb+0x242/0x350 [ 64.968661] [] ? rtnetlink_rcv+0x30/0x30 [ 64.974411] [] rtnetlink_rcv+0x25/0x30 [ 64.979963] [] netlink_unicast+0x455/0x660 [ 64.985891] [] ? netlink_unicast+0x3b5/0x660 [ 64.991987] [] ? netlink_attachskb+0x730/0x730 [ 64.998199] [] netlink_sendmsg+0x893/0xb40 [ 65.004073] [] ? netlink_unicast+0x660/0x660 [ 65.010109] [] ? __might_fault+0xf1/0x1b0 [ 65.015881] [] ? netlink_unicast+0x660/0x660 [ 65.021918] [] sock_sendmsg+0xb5/0xf0 [ 65.027360] [] SYSC_sendto+0x1c9/0x300 [ 65.032873] [] ? SYSC_connect+0x2a0/0x2a0 [ 65.038662] [] ? mntput_no_expire+0xb1/0x600 [ 65.044722] [] ? mntput_no_expire+0xce/0x600 [ 65.050776] [] ? mnt_get_count+0x1c0/0x1c0 [ 65.056634] [] ? mntput+0x52/0x70 [ 65.061730] [] ? ___might_sleep+0x331/0x440 [ 65.067681] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 65.074498] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 65.081141] [] SyS_sendto+0x9/0x10 [ 65.086307] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 65.094621] Kernel Offset: disabled