[ 45.037247] audit: type=1800 audit(1584997107.474:23): pid=7688 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rsyslog" dev="sda1" ino=2442 res=0 [ 45.060621] audit: type=1800 audit(1584997107.494:24): pid=7688 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="sudo" dev="sda1" ino=2454 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 57.435278] IPVS: Creating netns size=2712 id=1 [ 57.440078] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. 2020/03/23 20:58:48 parsed 1 programs 2020/03/23 20:58:48 executed programs: 0 [ 65.791006] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 65.803509] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 65.811536] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 65.820033] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 65.828148] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 65.836195] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 65.854722] IPVS: Creating netns size=2712 id=2 [ 65.859477] IPVS: ftp: loaded support on port[0] = 21 [ 65.931926] IPVS: Creating netns size=2712 id=3 [ 65.936860] IPVS: ftp: loaded support on port[0] = 21 [ 66.068315] chnl_net:caif_netlink_parms(): no params data found [ 66.095645] IPVS: Creating netns size=2712 id=4 [ 66.100536] IPVS: ftp: loaded support on port[0] = 21 [ 66.243690] IPVS: Creating netns size=2712 id=5 [ 66.248612] IPVS: ftp: loaded support on port[0] = 21 [ 66.418419] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.425809] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.435139] device bridge_slave_0 entered promiscuous mode [ 66.500045] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.506667] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.516158] device bridge_slave_1 entered promiscuous mode [ 66.538371] chnl_net:caif_netlink_parms(): no params data found [ 66.608417] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 66.635869] chnl_net:caif_netlink_parms(): no params data found [ 66.652581] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 66.701616] IPVS: Creating netns size=2712 id=6 [ 66.715650] IPVS: ftp: loaded support on port[0] = 21 [ 67.010532] chnl_net:caif_netlink_parms(): no params data found [ 67.036320] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 67.076500] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 67.092821] IPVS: Creating netns size=2712 id=7 [ 67.097649] IPVS: ftp: loaded support on port[0] = 21 [ 67.134415] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 67.142562] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 67.156178] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.162552] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.171654] device bridge_slave_0 entered promiscuous mode [ 67.250129] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.256594] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.266024] device bridge_slave_1 entered promiscuous mode [ 67.453473] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.459974] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.469462] device bridge_slave_0 entered promiscuous mode [ 67.499893] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 67.508778] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.516308] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.525695] device bridge_slave_1 entered promiscuous mode [ 67.581466] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.590076] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 67.598168] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 67.608090] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 67.702683] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 67.783382] chnl_net:caif_netlink_parms(): no params data found [ 67.967007] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 68.018817] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.025766] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.034709] device bridge_slave_0 entered promiscuous mode [ 68.042529] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 68.081736] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.089728] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.101210] device bridge_slave_1 entered promiscuous mode [ 68.289142] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 68.301971] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 68.336891] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 68.387048] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 68.465863] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.472837] chnl_net:caif_netlink_parms(): no params data found [ 68.518090] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.525673] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 68.579829] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 68.741780] bridge0: port 1(bridge_slave_0) entered blocking state [ 68.748483] bridge0: port 1(bridge_slave_0) entered disabled state [ 68.757689] device bridge_slave_0 entered promiscuous mode [ 68.831555] bridge0: port 2(bridge_slave_1) entered blocking state [ 68.838280] bridge0: port 2(bridge_slave_1) entered disabled state [ 68.847299] device bridge_slave_1 entered promiscuous mode [ 68.859987] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 69.015561] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 69.023737] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 69.075455] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 69.169657] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 69.233971] ------------[ cut here ]------------ [ 69.239285] WARNING: CPU: 0 PID: 7937 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 69.248003] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 69.255052] Kernel panic - not syncing: panic_on_warn set ... [ 69.255052] [ 69.262415] CPU: 0 PID: 7937 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 69.269933] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.279407] 1ffffffff0d95756 ffff8800b1c26fb0 ffffffff82c74fc6 ffffffff85c81040 [ 69.287610] ffff8800b1c27088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b1c27078 [ 69.295623] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 69.303652] Call Trace: [ 69.306232] [] dump_stack+0xe6/0x120 [ 69.311580] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.317357] [] panic+0x1af/0x348 [ 69.322353] [] ? set_ti_thread_flag+0xf/0xf [ 69.328298] [] ? sysfs_warn_dup+0x7b/0xa0 [ 69.334073] [] __warn+0x18d/0x1b0 [ 69.339150] [] warn_slowpath_fmt+0x92/0xb0 [ 69.345008] [] ? __warn+0x1b0/0x1b0 [ 69.350259] [] ? kernfs_path_from_node+0x4a/0x60 [ 69.356652] [] sysfs_warn_dup+0x7b/0xa0 [ 69.362265] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 69.369265] [] sysfs_create_link+0x43/0xb0 [ 69.375134] [] device_add+0x689/0x1360 [ 69.380664] [] ? kfree_const+0x1d/0x20 [ 69.386176] [] ? device_private_init+0x180/0x180 [ 69.392736] [] ? kfree_const+0x1d/0x20 [ 69.398260] [] ? kobject_set_name_vargs+0xb4/0x130 [ 69.404858] [] device_create_groups_vargs+0x1c8/0x220 [ 69.411680] [] device_create+0x88/0xa0 [ 69.417207] [] ? device_create_vargs+0x20/0x20 [ 69.423415] [] ? macvlan_set_mac_address+0x150/0x150 [ 69.430141] [] macvtap_device_event+0x1c4/0x2a0 [ 69.436435] [] notifier_call_chain+0x8b/0x170 [ 69.442551] [] raw_notifier_call_chain+0x11/0x20 [ 69.448942] [] call_netdevice_notifiers_info+0x47/0x80 [ 69.455856] [] register_netdevice+0x88a/0xce0 [ 69.462075] [] ? netdev_change_features+0x80/0x80 [ 69.468545] [] ? dev_get_nest_level+0x10c/0x1a0 [ 69.474845] [] macvlan_common_newlink+0x8b9/0x1090 [ 69.481397] [] macvtap_newlink+0xbf/0x110 [ 69.487182] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.493482] [] rtnl_newlink+0xd4b/0x1230 [ 69.499182] [] ? rtnl_link_ops_get+0x5d/0x90 [ 69.505223] [] ? rtnl_newlink+0x319/0x1230 [ 69.511080] [] ? rtnl_setlink+0x2f0/0x2f0 [ 69.516868] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 69.523595] [] ? __lock_acquire+0x1985/0x5560 [ 69.529712] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.536702] [] ? __netlink_ns_capable+0xc7/0xf0 [ 69.543010] [] rtnetlink_rcv_msg+0x222/0x680 [ 69.549041] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 69.555861] [] ? rtnetlink_rcv+0x30/0x30 [ 69.561556] [] ? mutex_lock_nested+0x638/0xb30 [ 69.567768] [] ? rtnetlink_rcv+0x16/0x30 [ 69.573462] [] ? netlink_lookup+0xd4/0x630 [ 69.579318] [] netlink_rcv_skb+0x242/0x350 [ 69.585176] [] ? rtnetlink_rcv+0x30/0x30 [ 69.590857] [] rtnetlink_rcv+0x25/0x30 [ 69.596369] [] netlink_unicast+0x455/0x660 [ 69.602222] [] ? netlink_unicast+0x3b5/0x660 [ 69.608260] [] ? netlink_attachskb+0x730/0x730 [ 69.614462] [] netlink_sendmsg+0x893/0xb40 [ 69.620336] [] ? netlink_unicast+0x660/0x660 [ 69.626377] [] ? __might_fault+0xf1/0x1b0 [ 69.632154] [] ? netlink_unicast+0x660/0x660 [ 69.638194] [] sock_sendmsg+0xb5/0xf0 [ 69.643617] [] SYSC_sendto+0x1c9/0x300 [ 69.649135] [] ? SYSC_connect+0x2a0/0x2a0 [ 69.654906] [] ? mntput_no_expire+0xb1/0x600 [ 69.660944] [] ? mntput_no_expire+0xce/0x600 [ 69.666973] [] ? mnt_get_count+0x1c0/0x1c0 [ 69.672834] [] ? mntput+0x52/0x70 [ 69.677911] [] ? ___might_sleep+0x331/0x440 [ 69.683856] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 69.690685] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 69.697243] [] SyS_sendto+0x9/0x10 [ 69.702409] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 69.710637] Kernel Offset: disabled