[ 42.965225] audit: type=1800 audit(1583075106.107:25): pid=7427 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.986846] audit: type=1800 audit(1583075106.127:26): pid=7427 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 43.013287] audit: type=1800 audit(1583075106.157:27): pid=7427 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: [ 56.692652] IPVS: Creating netns size=2712 id=1 [ 56.698279] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. 2020/03/01 15:05:28 parsed 1 programs 2020/03/01 15:05:28 executed programs: 0 [ 65.407888] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 65.417902] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 65.433779] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 65.443498] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 65.453362] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 65.462365] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 65.483279] IPVS: Creating netns size=2712 id=2 [ 65.488189] IPVS: ftp: loaded support on port[0] = 21 [ 65.568457] IPVS: Creating netns size=2712 id=3 [ 65.573773] IPVS: ftp: loaded support on port[0] = 21 [ 65.727863] chnl_net:caif_netlink_parms(): no params data found [ 65.756655] IPVS: Creating netns size=2712 id=4 [ 65.761868] IPVS: ftp: loaded support on port[0] = 21 [ 65.983609] chnl_net:caif_netlink_parms(): no params data found [ 66.015615] IPVS: Creating netns size=2712 id=5 [ 66.030299] IPVS: ftp: loaded support on port[0] = 21 [ 66.179477] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.185880] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.195807] device bridge_slave_0 entered promiscuous mode [ 66.252886] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.260077] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.270084] device bridge_slave_1 entered promiscuous mode [ 66.362697] chnl_net:caif_netlink_parms(): no params data found [ 66.384154] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 66.405856] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 66.441809] IPVS: Creating netns size=2712 id=6 [ 66.446719] IPVS: ftp: loaded support on port[0] = 21 [ 66.636626] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.643283] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.652754] device bridge_slave_0 entered promiscuous mode [ 66.721964] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.729087] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.739304] device bridge_slave_1 entered promiscuous mode [ 66.829744] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 66.894847] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 66.956665] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 66.968453] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 66.994598] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.001930] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.011248] device bridge_slave_0 entered promiscuous mode [ 67.019765] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.029754] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.053482] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.060281] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.069861] device bridge_slave_1 entered promiscuous mode [ 67.145633] chnl_net:caif_netlink_parms(): no params data found [ 67.251460] IPVS: Creating netns size=2712 id=7 [ 67.256357] IPVS: ftp: loaded support on port[0] = 21 [ 67.310388] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 67.398643] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.430556] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 67.499083] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 67.639280] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.698789] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.904529] chnl_net:caif_netlink_parms(): no params data found [ 67.965897] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.973736] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.986302] device bridge_slave_0 entered promiscuous mode [ 67.995607] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.002828] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.012936] device bridge_slave_1 entered promiscuous mode [ 68.077407] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.149571] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.204664] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 68.218736] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 68.319902] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 68.354056] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 68.537863] chnl_net:caif_netlink_parms(): no params data found [ 68.655308] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.726108] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.780877] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.787694] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.799921] device bridge_slave_0 entered promiscuous mode [ 68.856729] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.863321] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.876336] device bridge_slave_1 entered promiscuous mode [ 69.021120] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 69.033664] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 69.045803] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 69.081148] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 69.096216] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 69.352570] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 69.360500] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 69.476008] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 69.483809] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.490994] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.502050] device bridge_slave_0 entered promiscuous mode [ 69.532041] ------------[ cut here ]------------ [ 69.537091] WARNING: CPU: 0 PID: 7682 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 69.545276] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 69.552613] Kernel panic - not syncing: panic_on_warn set ... [ 69.552613] [ 69.560015] CPU: 0 PID: 7682 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 69.567561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.577054] 1ffffffff0d95756 ffff8800b9e1ee00 ffffffff82c74fc6 ffffffff85c81040 [ 69.585253] ffff8800b9e1eed8 ffffffff85d2bac0 ffffffff81922ccb ffff8800b9e1eec8 [ 69.593615] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 69.601659] Call Trace: [ 69.604324] [] dump_stack+0xe6/0x120 [ 69.609683] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.615771] [] panic+0x1af/0x348 [ 69.620980] [] ? set_ti_thread_flag+0xf/0xf [ 69.627027] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.633364] [] __warn+0x18d/0x1b0 [ 69.638593] [] warn_slowpath_fmt+0x92/0xb0 [ 69.644478] [] ? __warn+0x1b0/0x1b0 [ 69.649763] [] ? kernfs_path_from_node+0x4a/0x60 [ 69.656433] [] sysfs_warn_dup+0x7b/0xa0 [ 69.662875] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 69.670609] [] sysfs_create_link+0x43/0xb0 [ 69.676615] [] device_add+0x689/0x1360 [ 69.682174] [] ? kfree_const+0x1d/0x20 [ 69.687719] [] ? device_private_init+0x180/0x180 [ 69.694243] [] ? kfree_const+0x1d/0x20 [ 69.699904] [] ? kobject_set_name_vargs+0xb4/0x130 [ 69.706648] [] device_create_groups_vargs+0x1c8/0x220 [ 69.713994] [] device_create+0x88/0xa0 [ 69.719533] [] ? device_create_vargs+0x20/0x20 [ 69.725895] [] ? macvlan_set_mac_address+0x150/0x150 [ 69.732645] [] macvtap_device_event+0x1c4/0x2a0 [ 69.739016] [] notifier_call_chain+0x8b/0x170 [ 69.745170] [] raw_notifier_call_chain+0x11/0x20 [ 69.751783] [] call_netdevice_notifiers_info+0x47/0x80 [ 69.758906] [] register_netdevice+0x88a/0xce0 [ 69.765224] [] ? netdev_change_features+0x80/0x80 [ 69.771888] [] ? dev_get_nest_level+0x10c/0x1a0 [ 69.778517] [] macvlan_common_newlink+0x8b9/0x1090 [ 69.785461] [] macvtap_newlink+0xbf/0x110 [ 69.791272] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.797587] [] rtnl_newlink+0xd4b/0x1230 [ 69.803422] [] ? rtnl_link_ops_get+0x5d/0x90 [ 69.809474] [] ? rtnl_newlink+0x319/0x1230 [ 69.815378] [] ? load_balance+0x990/0x1ea0 [ 69.822329] [] ? rtnl_setlink+0x2f0/0x2f0 [ 69.828247] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 69.834995] [] ? __lock_acquire+0x1985/0x5560 [ 69.841223] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.848415] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.854858] [] rtnetlink_rcv_msg+0x222/0x680 [ 69.860960] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 69.867794] [] ? rtnetlink_rcv+0x30/0x30 [ 69.873633] [] ? mutex_lock_nested+0x638/0xb30 [ 69.879909] [] ? rtnetlink_rcv+0x16/0x30 [ 69.885617] [] ? netlink_lookup+0xd4/0x630 [ 69.891492] [] netlink_rcv_skb+0x242/0x350 [ 69.897382] [] ? rtnetlink_rcv+0x30/0x30 [ 69.903159] [] rtnetlink_rcv+0x25/0x30 [ 69.908747] [] netlink_unicast+0x455/0x660 [ 69.914629] [] ? netlink_unicast+0x3b5/0x660 [ 69.920684] [] ? netlink_attachskb+0x730/0x730 [ 69.927033] [] netlink_sendmsg+0x893/0xb40 [ 69.933754] [] ? netlink_unicast+0x660/0x660 [ 69.939825] [] ? __might_fault+0xf1/0x1b0 [ 69.945800] [] ? netlink_unicast+0x660/0x660 [ 69.951969] [] sock_sendmsg+0xb5/0xf0 [ 69.957554] [] SYSC_sendto+0x1c9/0x300 [ 69.963445] [] ? SYSC_connect+0x2a0/0x2a0 [ 69.969291] [] ? _raw_spin_unlock_irqrestore+0xa6/0xd0 [ 69.976238] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.983248] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 69.990013] [] ? __might_fault+0xf1/0x1b0 [ 69.995942] [] SyS_sendto+0x9/0x10 [ 70.001784] [] compat_SyS_socketcall+0x482/0x7d0 [ 70.008400] [] ? compat_SyS_recvmmsg+0x120/0x120 [ 70.014906] [] ? ___might_sleep+0x331/0x440 [ 70.021135] [] ? task_work_run+0x14a/0x200 [ 70.027131] [] do_fast_syscall_32+0x324/0xa70 [ 70.033411] [] ? trace_hardirqs_off_thunk+0x1b/0x1d [ 70.040333] [] entry_SYSENTER_compat+0x54/0x63 [ 70.048640] Kernel Offset: disabled