[info] Using makefile-style concurrent boot in runlevel 2. [....] 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: [ 45.137484] IPVS: Creating netns size=2712 id=1 [ 45.142508] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. 2020/03/07 06:30:14 parsed 1 programs 2020/03/07 06:30:14 executed programs: 0 [ 52.866814] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 52.884656] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 52.892820] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 52.900743] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 52.909308] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 52.917547] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 52.934961] IPVS: Creating netns size=2712 id=2 [ 52.939713] IPVS: ftp: loaded support on port[0] = 21 [ 53.007895] IPVS: Creating netns size=2712 id=3 [ 53.012804] IPVS: ftp: loaded support on port[0] = 21 [ 53.142773] chnl_net:caif_netlink_parms(): no params data found [ 53.152573] IPVS: Creating netns size=2712 id=4 [ 53.157318] IPVS: ftp: loaded support on port[0] = 21 [ 53.349990] IPVS: Creating netns size=2712 id=5 [ 53.356422] IPVS: ftp: loaded support on port[0] = 21 [ 53.456683] chnl_net:caif_netlink_parms(): no params data found [ 53.502879] bridge0: port 1(bridge_slave_0) entered blocking state [ 53.509259] bridge0: port 1(bridge_slave_0) entered disabled state [ 53.518193] device bridge_slave_0 entered promiscuous mode [ 53.579847] bridge0: port 2(bridge_slave_1) entered blocking state [ 53.586413] bridge0: port 2(bridge_slave_1) entered disabled state [ 53.595367] device bridge_slave_1 entered promiscuous mode [ 53.665530] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 53.680241] IPVS: Creating netns size=2712 id=6 [ 53.685965] IPVS: ftp: loaded support on port[0] = 21 [ 53.723970] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 53.755972] chnl_net:caif_netlink_parms(): no params data found [ 53.927587] chnl_net:caif_netlink_parms(): no params data found [ 54.049544] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 54.085764] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 54.112553] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.119025] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.128640] IPVS: Creating netns size=2712 id=7 [ 54.130075] device bridge_slave_0 entered promiscuous mode [ 54.139397] IPVS: ftp: loaded support on port[0] = 21 [ 54.170168] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 54.178620] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.185195] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.194012] device bridge_slave_1 entered promiscuous mode [ 54.207073] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 54.423490] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 54.446777] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.453368] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.462293] device bridge_slave_0 entered promiscuous mode [ 54.473743] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 54.495764] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.502458] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.511484] device bridge_slave_1 entered promiscuous mode [ 54.559889] chnl_net:caif_netlink_parms(): no params data found [ 54.593104] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 54.670188] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 54.688386] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.696240] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.705107] device bridge_slave_0 entered promiscuous mode [ 54.714977] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 54.761242] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.767861] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.776635] device bridge_slave_1 entered promiscuous mode [ 54.785254] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.009522] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.049220] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.060560] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.150939] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 55.256899] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.310749] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 55.406399] chnl_net:caif_netlink_parms(): no params data found [ 55.421067] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 55.486088] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 55.512466] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.518871] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.529758] device bridge_slave_0 entered promiscuous mode [ 55.570898] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.579524] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.588887] device bridge_slave_1 entered promiscuous mode [ 55.636786] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 55.690740] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.699203] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 55.725495] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.735116] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 55.755839] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.765219] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.025504] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.096601] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.143074] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.169805] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.176548] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.185435] device bridge_slave_0 entered promiscuous mode [ 56.212606] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.242162] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.248613] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.257648] device bridge_slave_1 entered promiscuous mode [ 56.398453] ------------[ cut here ]------------ [ 56.403404] WARNING: CPU: 1 PID: 6947 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 56.411378] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 56.418555] Kernel panic - not syncing: panic_on_warn set ... [ 56.418555] [ 56.425892] CPU: 1 PID: 6947 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 56.433489] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.442824] 1ffffffff0d95756 ffff8800b9cf6fb0 ffffffff82c74fc6 ffffffff85c81040 [ 56.450863] ffff8800b9cf7088 ffffffff85d2bac0 ffffffff81922ccb ffff8800b9cf7078 [ 56.458858] ffffffff8160cf4e 0000000041b58ab3 ffffffff868f2161 ffffffff8160cd9f [ 56.466886] Call Trace: [ 56.469454] [] dump_stack+0xe6/0x120 [ 56.474789] [] ? sysfs_warn_dup+0x7b/0xa0 [ 56.480560] [] panic+0x1af/0x348 [ 56.485558] [] ? set_ti_thread_flag+0xf/0xf [ 56.491512] [] ? sysfs_warn_dup+0x7b/0xa0 [ 56.497292] [] __warn+0x18d/0x1b0 [ 56.502367] [] warn_slowpath_fmt+0x92/0xb0 [ 56.508225] [] ? __warn+0x1b0/0x1b0 [ 56.513474] [] ? kernfs_path_from_node+0x4a/0x60 [ 56.519850] [] sysfs_warn_dup+0x7b/0xa0 [ 56.525464] [] sysfs_do_create_link_sd.isra.2+0xd1/0xf0 [ 56.532507] [] sysfs_create_link+0x43/0xb0 [ 56.538516] [] device_add+0x689/0x1360 [ 56.544153] [] ? device_private_init+0x180/0x180 [ 56.550536] [] ? kfree_const+0x1d/0x20 [ 56.556071] [] ? kobject_set_name_vargs+0xb4/0x130 [ 56.562639] [] device_create_groups_vargs+0x1c8/0x220 [ 56.569603] [] device_create+0x88/0xa0 [ 56.575129] [] ? device_create_vargs+0x20/0x20 [ 56.581347] [] ? macvlan_set_mac_address+0x150/0x150 [ 56.588090] [] macvtap_device_event+0x1c4/0x2a0 [ 56.594388] [] notifier_call_chain+0x8b/0x170 [ 56.600674] [] raw_notifier_call_chain+0x11/0x20 [ 56.607065] [] call_netdevice_notifiers_info+0x47/0x80 [ 56.613990] [] register_netdevice+0x88a/0xce0 [ 56.620142] [] ? netdev_change_features+0x80/0x80 [ 56.626695] [] ? kmem_cache_alloc_trace+0x34f/0x6b0 [ 56.633341] [] ? dev_get_nest_level+0x10c/0x1a0 [ 56.639647] [] macvlan_common_newlink+0x8b9/0x1090 [ 56.646211] [] macvtap_newlink+0xbf/0x110 [ 56.651989] [] ? __netlink_ns_capable+0xc7/0xf0 [ 56.658298] [] rtnl_newlink+0xd4b/0x1230 [ 56.663989] [] ? rtnl_link_ops_get+0x5d/0x90 [ 56.670238] [] ? rtnl_newlink+0x319/0x1230 [ 56.676304] [] ? rtnl_setlink+0x2f0/0x2f0 [ 56.682080] [] ? sched_clock_cpu+0x152/0x1e0 [ 56.688133] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 56.695158] [] ? __netlink_ns_capable+0xc7/0xf0 [ 56.701467] [] rtnetlink_rcv_msg+0x222/0x680 [ 56.707519] [] ? memset+0x28/0x30 [ 56.712611] [] ? rtnetlink_rcv+0x30/0x30 [ 56.718400] [] ? mutex_lock_nested+0x638/0xb30 [ 56.724708] [] ? rtnetlink_rcv+0x16/0x30 [ 56.730424] [] ? netlink_lookup+0xd4/0x630 [ 56.736453] [] netlink_rcv_skb+0x242/0x350 [ 56.742318] [] ? rtnetlink_rcv+0x30/0x30 [ 56.748601] [] rtnetlink_rcv+0x25/0x30 [ 56.754124] [] netlink_unicast+0x455/0x660 [ 56.760101] [] ? netlink_unicast+0x3b5/0x660 [ 56.766221] [] ? netlink_attachskb+0x730/0x730 [ 56.772444] [] netlink_sendmsg+0x893/0xb40 [ 56.778997] [] ? netlink_unicast+0x660/0x660 [ 56.785601] [] ? __might_fault+0xf1/0x1b0 [ 56.791616] [] ? security_socket_sendmsg+0x6a/0xa0 [ 56.798300] [] ? netlink_unicast+0x660/0x660 [ 56.804531] [] sock_sendmsg+0xb5/0xf0 [ 56.809976] [] SYSC_sendto+0x1c9/0x300 [ 56.815636] [] ? SYSC_connect+0x2a0/0x2a0 [ 56.821459] [] ? mnt_get_count+0x1c0/0x1c0 [ 56.827317] [] ? mntput_no_expire+0xb1/0x600 [ 56.833349] [] ? mntput_no_expire+0xce/0x600 [ 56.839379] [] ? mnt_get_count+0x1c0/0x1c0 [ 56.845238] [] ? mntput+0x52/0x70 [ 56.850329] [] ? ___might_sleep+0x331/0x440 [ 56.856284] [] ? trace_hardirqs_off+0xd/0x10 [ 56.862317] [] ? exit_to_usermode_loop+0xcb/0x1c0 [ 56.868808] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 56.875360] [] SyS_sendto+0x9/0x10 [ 56.880523] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 56.888517] Kernel Offset: disabled