[ 43.692367] audit: type=1800 audit(1582018172.106:25): pid=7348 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 43.713969] audit: type=1800 audit(1582018172.126:26): pid=7348 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 43.738647] audit: type=1800 audit(1582018172.146:27): pid=7348 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: [ 56.607350] IPVS: Creating netns size=2712 id=1 [ 56.612735] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.1.26' (ECDSA) to the list of known hosts. 2020/02/18 09:29:53 parsed 1 programs 2020/02/18 09:29:53 executed programs: 0 [ 64.987593] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 64.997927] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 65.008987] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 65.017892] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 65.026775] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 65.034849] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 65.053435] IPVS: Creating netns size=2712 id=2 [ 65.058379] IPVS: ftp: loaded support on port[0] = 21 [ 65.133358] IPVS: Creating netns size=2712 id=3 [ 65.138522] IPVS: ftp: loaded support on port[0] = 21 [ 65.292865] chnl_net:caif_netlink_parms(): no params data found [ 65.302188] IPVS: Creating netns size=2712 id=4 [ 65.307024] IPVS: ftp: loaded support on port[0] = 21 [ 65.518727] chnl_net:caif_netlink_parms(): no params data found [ 65.568166] IPVS: Creating netns size=2712 id=5 [ 65.573753] IPVS: ftp: loaded support on port[0] = 21 [ 65.751757] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.758508] bridge0: port 1(bridge_slave_0) entered disabled state [ 65.768635] device bridge_slave_0 entered promiscuous mode [ 65.777299] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.784385] bridge0: port 2(bridge_slave_1) entered disabled state [ 65.794021] device bridge_slave_1 entered promiscuous mode [ 65.883821] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 65.898810] chnl_net:caif_netlink_parms(): no params data found [ 65.917649] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 65.948693] IPVS: Creating netns size=2712 id=6 [ 65.954062] IPVS: ftp: loaded support on port[0] = 21 [ 66.183936] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.191309] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.201028] device bridge_slave_0 entered promiscuous mode [ 66.282980] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.289408] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.299049] device bridge_slave_1 entered promiscuous mode [ 66.317115] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 66.326198] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 66.370928] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 66.379816] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 66.423541] chnl_net:caif_netlink_parms(): no params data found [ 66.461809] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 66.484358] IPVS: Creating netns size=2712 id=7 [ 66.498902] IPVS: ftp: loaded support on port[0] = 21 [ 66.533839] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 66.692066] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 66.722242] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.728848] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.741003] device bridge_slave_0 entered promiscuous mode [ 66.748933] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 66.788606] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.795331] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.804428] device bridge_slave_1 entered promiscuous mode [ 67.034376] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.044903] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 67.115419] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.122179] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.132028] device bridge_slave_0 entered promiscuous mode [ 67.140920] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.151294] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.174832] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.181694] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.190899] device bridge_slave_1 entered promiscuous mode [ 67.405567] chnl_net:caif_netlink_parms(): no params data found [ 67.449819] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 67.464355] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.544641] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 67.675863] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 67.856054] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.876450] chnl_net:caif_netlink_parms(): no params data found [ 67.898784] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.961059] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 68.027901] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 68.059477] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 68.116671] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.123417] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.133809] device bridge_slave_0 entered promiscuous mode [ 68.202497] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.208919] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.218405] device bridge_slave_1 entered promiscuous mode [ 68.256217] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.305748] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.343026] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.353547] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 68.367528] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.402306] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 68.692434] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.699067] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.708700] device bridge_slave_0 entered promiscuous mode [ 68.732336] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 68.793271] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.800033] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.809716] device bridge_slave_1 entered promiscuous mode [ 68.986314] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 68.996363] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 69.020885] ------------[ cut here ]------------ [ 69.025703] WARNING: CPU: 0 PID: 7605 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 69.033878] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 69.040930] Kernel panic - not syncing: panic_on_warn set ... [ 69.040930] [ 69.048348] CPU: 0 PID: 7605 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 69.055990] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.065532] 1ffffffff0d95756 ffff88012a856fb0 ffffffff82c74fc6 ffffffff85c81040 [ 69.073742] ffff88012a857088 ffffffff85d2bac0 ffffffff81922ccb ffff88012a857078 [ 69.082171] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 69.090291] Call Trace: [ 69.092874] [] dump_stack+0xe6/0x120 [ 69.098219] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.104070] [] panic+0x1af/0x348 [ 69.109326] [] ? set_ti_thread_flag+0xf/0xf [ 69.115368] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.121158] [] __warn+0x18d/0x1b0 [ 69.126641] [] warn_slowpath_fmt+0x92/0xb0 [ 69.132790] [] ? __warn+0x1b0/0x1b0 [ 69.138240] [] ? kernfs_path_from_node+0x4a/0x60 [ 69.144662] [] sysfs_warn_dup+0x7b/0xa0 [ 69.150492] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 69.157508] [] sysfs_create_link+0x43/0xb0 [ 69.163636] [] device_add+0x689/0x1360 [ 69.169161] [] ? kfree_const+0x1d/0x20 [ 69.174701] [] ? device_private_init+0x180/0x180 [ 69.181101] [] ? kfree_const+0x1d/0x20 [ 69.186814] [] ? kobject_set_name_vargs+0xb4/0x130 [ 69.193392] [] device_create_groups_vargs+0x1c8/0x220 [ 69.200228] [] device_create+0x88/0xa0 [ 69.205933] [] ? device_create_vargs+0x20/0x20 [ 69.212170] [] ? macvlan_set_mac_address+0x150/0x150 [ 69.219051] [] macvtap_device_event+0x1c4/0x2a0 [ 69.225366] [] notifier_call_chain+0x8b/0x170 [ 69.232561] [] raw_notifier_call_chain+0x11/0x20 [ 69.238970] [] call_netdevice_notifiers_info+0x47/0x80 [ 69.246068] [] register_netdevice+0x88a/0xce0 [ 69.252897] [] ? netdev_change_features+0x80/0x80 [ 69.259397] [] ? dev_get_nest_level+0x10c/0x1a0 [ 69.265797] [] macvlan_common_newlink+0x8b9/0x1090 [ 69.272588] [] macvtap_newlink+0xbf/0x110 [ 69.278510] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.285078] [] rtnl_newlink+0xd4b/0x1230 [ 69.290808] [] ? rtnl_link_ops_get+0x5d/0x90 [ 69.296976] [] ? rtnl_newlink+0x319/0x1230 [ 69.302861] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.309911] [] ? rtnl_setlink+0x2f0/0x2f0 [ 69.315709] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 69.322494] [] ? __lock_acquire+0x1a38/0x5560 [ 69.328880] [] ? update_cfs_rq_load_avg+0x511/0x1100 [ 69.335772] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.342794] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.349716] [] rtnetlink_rcv_msg+0x222/0x680 [ 69.355772] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 69.362603] [] ? rtnetlink_rcv+0x30/0x30 [ 69.368314] [] ? mutex_lock_nested+0x638/0xb30 [ 69.374963] [] ? rtnetlink_rcv+0x16/0x30 [ 69.381982] [] ? netlink_lookup+0xd4/0x630 [ 69.387869] [] netlink_rcv_skb+0x242/0x350 [ 69.393764] [] ? rtnetlink_rcv+0x30/0x30 [ 69.399708] [] rtnetlink_rcv+0x25/0x30 [ 69.405435] [] netlink_unicast+0x455/0x660 [ 69.411435] [] ? netlink_unicast+0x3b5/0x660 [ 69.417515] [] ? netlink_attachskb+0x730/0x730 [ 69.423873] [] netlink_sendmsg+0x893/0xb40 [ 69.429856] [] ? netlink_unicast+0x660/0x660 [ 69.435915] [] ? __might_fault+0xf1/0x1b0 [ 69.441816] [] ? netlink_unicast+0x660/0x660 [ 69.447872] [] sock_sendmsg+0xb5/0xf0 [ 69.453351] [] SYSC_sendto+0x1c9/0x300 [ 69.458948] [] ? SYSC_connect+0x2a0/0x2a0 [ 69.465228] [] ? mntput_no_expire+0xb1/0x600 [ 69.471473] [] ? mntput_no_expire+0xce/0x600 [ 69.477645] [] ? mnt_get_count+0x1c0/0x1c0 [ 69.483517] [] ? mntput+0x52/0x70 [ 69.488749] [] ? ___might_sleep+0x331/0x440 [ 69.494992] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 69.501942] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 69.508562] [] SyS_sendto+0x9/0x10 [ 69.513895] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 69.522170] Kernel Offset: disabled