[ 39.985899] audit: type=1800 audit(1584974924.877:27): pid=7201 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 40.009732] audit: type=1800 audit(1584974924.897:28): pid=7201 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 40.450502] audit: type=1800 audit(1584974925.337:29): pid=7201 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 51.592282] IPVS: Creating netns size=2712 id=1 [ 51.597491] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. 2020/03/23 14:49:04 parsed 1 programs 2020/03/23 14:49:04 executed programs: 0 [ 59.982621] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 59.994877] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 60.003243] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 60.011893] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 60.020325] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 60.028238] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 60.046611] IPVS: Creating netns size=2712 id=2 [ 60.051371] IPVS: ftp: loaded support on port[0] = 21 [ 60.122074] IPVS: Creating netns size=2712 id=3 [ 60.127019] IPVS: ftp: loaded support on port[0] = 21 [ 60.273313] chnl_net:caif_netlink_parms(): no params data found [ 60.282036] IPVS: Creating netns size=2712 id=4 [ 60.287071] IPVS: ftp: loaded support on port[0] = 21 [ 60.492185] chnl_net:caif_netlink_parms(): no params data found [ 60.521318] IPVS: Creating netns size=2712 id=5 [ 60.536965] IPVS: ftp: loaded support on port[0] = 21 [ 60.622706] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.629309] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.638767] device bridge_slave_0 entered promiscuous mode [ 60.682043] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.688578] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.698224] device bridge_slave_1 entered promiscuous mode [ 60.824235] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.838635] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.902788] IPVS: Creating netns size=2712 id=6 [ 60.907503] chnl_net:caif_netlink_parms(): no params data found [ 60.913842] IPVS: ftp: loaded support on port[0] = 21 [ 61.005280] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.011812] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.020910] device bridge_slave_0 entered promiscuous mode [ 61.034926] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.041652] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.052414] device bridge_slave_1 entered promiscuous mode [ 61.194988] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.206203] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.234221] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 61.248923] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 61.269325] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 61.362967] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 61.404559] IPVS: Creating netns size=2712 id=7 [ 61.418436] IPVS: ftp: loaded support on port[0] = 21 [ 61.629205] bridge0: port 1(bridge_slave_0) entered blocking state [ 61.636323] bridge0: port 1(bridge_slave_0) entered disabled state [ 61.647367] device bridge_slave_0 entered promiscuous mode [ 61.654910] chnl_net:caif_netlink_parms(): no params data found [ 61.670164] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 61.713867] bridge0: port 2(bridge_slave_1) entered blocking state [ 61.720625] bridge0: port 2(bridge_slave_1) entered disabled state [ 61.730108] device bridge_slave_1 entered promiscuous mode [ 61.737853] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 61.751523] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 61.831647] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 61.861566] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 61.966383] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.150594] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.158507] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 62.176111] chnl_net:caif_netlink_parms(): no params data found [ 62.396790] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 62.404341] bridge0: port 1(bridge_slave_0) entered blocking state [ 62.411558] bridge0: port 1(bridge_slave_0) entered disabled state [ 62.420552] device bridge_slave_0 entered promiscuous mode [ 62.456368] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 62.474013] bridge0: port 2(bridge_slave_1) entered blocking state [ 62.480763] bridge0: port 2(bridge_slave_1) entered disabled state [ 62.489796] device bridge_slave_1 entered promiscuous mode [ 62.744927] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 62.795819] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 62.804210] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 62.854255] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 62.882113] chnl_net:caif_netlink_parms(): no params data found [ 62.966561] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 63.061803] bridge0: port 1(bridge_slave_0) entered blocking state [ 63.072638] bridge0: port 1(bridge_slave_0) entered disabled state [ 63.082541] device bridge_slave_0 entered promiscuous mode [ 63.131984] bridge0: port 2(bridge_slave_1) entered blocking state [ 63.138459] bridge0: port 2(bridge_slave_1) entered disabled state [ 63.147855] device bridge_slave_1 entered promiscuous mode [ 63.316276] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 63.324796] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 63.335356] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 63.390123] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 63.398610] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 63.477971] ------------[ cut here ]------------ [ 63.482901] WARNING: CPU: 0 PID: 7458 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 63.491482] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 63.498980] Kernel panic - not syncing: panic_on_warn set ... [ 63.498980] [ 63.506346] CPU: 0 PID: 7458 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 [ 63.513957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.523418] 1ffffffff0d95756 ffff8800b312efb0 ffffffff82c74fc6 ffffffff85c81040 [ 63.531490] ffff8800b312f088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b312f078 [ 63.539600] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f1f61 ffffffff8160cd9f [ 63.547627] Call Trace: [ 63.550247] [] dump_stack+0xe6/0x120 [ 63.555812] [] ? sysfs_warn_dup+0x7b/0xa0 [ 63.561611] [] panic+0x1af/0x348 [ 63.566607] [] ? set_ti_thread_flag+0xf/0xf [ 63.572555] [] ? sysfs_warn_dup+0x7b/0xa0 [ 63.578330] [] __warn+0x18d/0x1b0 [ 63.583416] [] warn_slowpath_fmt+0x92/0xb0 [ 63.589281] [] ? __warn+0x1b0/0x1b0 [ 63.594531] [] ? kernfs_path_from_node+0x4a/0x60 [ 63.600908] [] sysfs_warn_dup+0x7b/0xa0 [ 63.606507] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 63.613502] [] sysfs_create_link+0x43/0xb0 [ 63.619364] [] device_add+0x689/0x1360 [ 63.624886] [] ? kfree_const+0x1d/0x20 [ 63.630406] [] ? device_private_init+0x180/0x180 [ 63.636785] [] ? kfree_const+0x1d/0x20 [ 63.642305] [] ? kobject_set_name_vargs+0xb4/0x130 [ 63.648863] [] device_create_groups_vargs+0x1c8/0x220 [ 63.655684] [] device_create+0x88/0xa0 [ 63.661201] [] ? device_create_vargs+0x20/0x20 [ 63.667409] [] ? macvlan_set_mac_address+0x150/0x150 [ 63.674582] [] macvtap_device_event+0x1c4/0x2a0 [ 63.680876] [] notifier_call_chain+0x8b/0x170 [ 63.687010] [] raw_notifier_call_chain+0x11/0x20 [ 63.693406] [] call_netdevice_notifiers_info+0x47/0x80 [ 63.700324] [] register_netdevice+0x88a/0xce0 [ 63.706464] [] ? netdev_change_features+0x80/0x80 [ 63.712933] [] ? dev_get_nest_level+0x10c/0x1a0 [ 63.719245] [] macvlan_common_newlink+0x8b9/0x1090 [ 63.725808] [] macvtap_newlink+0xbf/0x110 [ 63.731581] [] ? __netlink_ns_capable+0xc7/0xf0 [ 63.737895] [] rtnl_newlink+0xd4b/0x1230 [ 63.743628] [] ? rtnl_link_ops_get+0x5d/0x90 [ 63.749708] [] ? rtnl_newlink+0x319/0x1230 [ 63.755581] [] ? rtnl_setlink+0x2f0/0x2f0 [ 63.761365] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 63.768107] [] ? __lock_acquire+0x1a38/0x5560 [ 63.774284] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 63.781281] [] ? __netlink_ns_capable+0xc7/0xf0 [ 63.787644] [] rtnetlink_rcv_msg+0x222/0x680 [ 63.793681] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 63.800505] [] ? rtnetlink_rcv+0x30/0x30 [ 63.806202] [] ? mutex_lock_nested+0x638/0xb30 [ 63.812408] [] ? rtnetlink_rcv+0x16/0x30 [ 63.818095] [] ? netlink_lookup+0xd4/0x630 [ 63.823991] [] netlink_rcv_skb+0x242/0x350 [ 63.829862] [] ? rtnetlink_rcv+0x30/0x30 [ 63.835569] [] rtnetlink_rcv+0x25/0x30 [ 63.841201] [] netlink_unicast+0x455/0x660 [ 63.847066] [] ? netlink_unicast+0x3b5/0x660 [ 63.853169] [] ? netlink_attachskb+0x730/0x730 [ 63.859420] [] netlink_sendmsg+0x893/0xb40 [ 63.865301] [] ? netlink_unicast+0x660/0x660 [ 63.871351] [] ? __might_fault+0xf1/0x1b0 [ 63.877133] [] ? netlink_unicast+0x660/0x660 [ 63.883167] [] sock_sendmsg+0xb5/0xf0 [ 63.888651] [] SYSC_sendto+0x1c9/0x300 [ 63.894165] [] ? SYSC_connect+0x2a0/0x2a0 [ 63.899942] [] ? mntput_no_expire+0xb1/0x600 [ 63.905974] [] ? mntput_no_expire+0xce/0x600 [ 63.912006] [] ? mnt_get_count+0x1c0/0x1c0 [ 63.917875] [] ? mntput+0x52/0x70 [ 63.922952] [] ? ___might_sleep+0x331/0x440 [ 63.929894] [] ? trace_hardirqs_on_caller+0x44c/0x5e0 [ 63.936718] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 63.943281] [] SyS_sendto+0x9/0x10 [ 63.948590] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 63.956511] Kernel Offset: disabled