Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.298033] IPVS: Creating netns size=2712 id=1 [ 33.302770] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.80' (ECDSA) to the list of known hosts. 2020/07/30 11:00:15 parsed 1 programs 2020/07/30 11:00:15 executed programs: 0 [ 40.812719] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 40.840669] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 40.849811] IPVS: Creating netns size=2712 id=2 [ 40.849944] IPVS: ftp: loaded support on port[0] = 21 [ 40.869919] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 40.885326] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 40.898805] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 40.906781] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 40.968506] IPVS: Creating netns size=2712 id=3 [ 40.973323] IPVS: ftp: loaded support on port[0] = 21 [ 41.110240] chnl_net:caif_netlink_parms(): no params data found [ 41.152523] IPVS: Creating netns size=2712 id=4 [ 41.157652] IPVS: ftp: loaded support on port[0] = 21 [ 41.314275] chnl_net:caif_netlink_parms(): no params data found [ 41.391660] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.398063] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.407254] device bridge_slave_0 entered promiscuous mode [ 41.425122] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.427759] IPVS: Creating netns size=2712 id=5 [ 41.427872] IPVS: ftp: loaded support on port[0] = 21 [ 41.443475] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.453090] device bridge_slave_1 entered promiscuous mode [ 41.534020] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.567411] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.815723] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.822093] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.831399] device bridge_slave_0 entered promiscuous mode [ 41.855791] IPVS: Creating netns size=2712 id=6 [ 41.860598] IPVS: ftp: loaded support on port[0] = 21 [ 41.871642] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.879558] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.886620] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.895206] device bridge_slave_1 entered promiscuous mode [ 41.946175] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.991058] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.086850] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.096762] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.104736] chnl_net:caif_netlink_parms(): no params data found [ 42.147288] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.276903] IPVS: Creating netns size=2712 id=7 [ 42.282380] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.283162] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.300906] IPVS: ftp: loaded support on port[0] = 21 [ 42.319169] chnl_net:caif_netlink_parms(): no params data found [ 42.606861] chnl_net:caif_netlink_parms(): no params data found [ 42.651463] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.694087] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.818870] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.825352] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.834063] device bridge_slave_0 entered promiscuous mode [ 42.904177] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.910603] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.919872] device bridge_slave_1 entered promiscuous mode [ 42.948763] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.018909] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.026068] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.032424] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.041934] device bridge_slave_0 entered promiscuous mode [ 43.107830] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.114200] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.124500] device bridge_slave_1 entered promiscuous mode [ 43.133620] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.228540] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.360682] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.401123] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.407923] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.417138] device bridge_slave_0 entered promiscuous mode [ 43.437313] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.446441] chnl_net:caif_netlink_parms(): no params data found [ 43.461469] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.467925] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.477195] device bridge_slave_1 entered promiscuous mode [ 43.593619] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 43.732132] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.787226] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.807187] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.848020] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.890030] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.939697] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.035797] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.070306] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.099814] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 44.137518] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.188466] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.195323] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.206829] device bridge_slave_0 entered promiscuous mode [ 44.215514] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.249472] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.255929] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.265555] device bridge_slave_1 entered promiscuous mode [ 44.293096] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.365946] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.446554] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.502620] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.559406] 8021q: adding VLAN 0 to HW filter on device bond0 [ 44.611965] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.624785] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.661467] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.697706] ------------[ cut here ]------------ [ 44.702461] WARNING: CPU: 1 PID: 5889 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 44.711053] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 44.718475] Kernel panic - not syncing: panic_on_warn set ... [ 44.718475] [ 44.725882] CPU: 1 PID: 5889 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 44.733385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.742712] 0000000000000000 ffff8800b0c8efc8 ffffffff82c65e52 ffffffff85c81040 [ 44.750708] ffff8800b0c8f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.758693] ffff8800b0c8f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a [ 44.766680] Call Trace: [ 44.769242] [] dump_stack+0x136/0x1d4 [ 44.774665] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.780435] [] panic+0x1af/0x348 [ 44.785420] [] ? to_vmem_altmap+0x125/0x125 [ 44.791363] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.797129] [] __warn+0x18d/0x1b0 [ 44.802202] [] warn_slowpath_fmt+0x92/0xb0 [ 44.808105] [] ? __warn+0x1b0/0x1b0 [ 44.813353] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.819740] [] sysfs_warn_dup+0x7b/0xa0 [ 44.825350] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.832333] [] sysfs_create_link+0x43/0xb0 [ 44.838249] [] device_add+0x677/0x1350 [ 44.843776] [] ? device_private_init+0x180/0x180 [ 44.850183] [] ? kfree_const+0x1d/0x20 [ 44.855694] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.862263] [] device_create_groups_vargs+0x1c8/0x220 [ 44.869078] [] device_create+0x88/0xa0 [ 44.874610] [] ? device_create_vargs+0x20/0x20 [ 44.880810] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.887532] [] macvtap_device_event+0x1c4/0x2a0 [ 44.893838] [] notifier_call_chain+0x8b/0x170 [ 44.899949] [] raw_notifier_call_chain+0x11/0x20 [ 44.906325] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.913219] [] register_netdevice+0x8e8/0xd00 [ 44.919349] [] ? netdev_change_features+0x80/0x80 [ 44.925811] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.932098] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.938646] [] macvtap_newlink+0xbf/0x110 [ 44.944411] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.950697] [] rtnl_newlink+0xd4b/0x1230 [ 44.956393] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.962424] [] ? rtnl_newlink+0x319/0x1230 [ 44.968281] [] ? find_next_bit+0x15/0x20 [ 44.973966] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.979739] [] ? cpuacct_css_alloc+0x160/0x160 [ 44.985943] [] ? update_blocked_averages+0x8f7/0x1540 [ 44.992755] [] ? find_busiest_group+0x2510/0x2510 [ 44.999222] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 45.006208] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.012514] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.018548] [] ? rtnetlink_rcv+0x30/0x30 [ 45.024231] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.030482] [] ? rtnetlink_rcv+0x16/0x30 [ 45.036163] [] ? netlink_seq_start+0xe0/0xe0 [ 45.042192] [] netlink_rcv_skb+0x242/0x350 [ 45.048047] [] ? rtnetlink_rcv+0x30/0x30 [ 45.053728] [] rtnetlink_rcv+0x25/0x30 [ 45.059240] [] netlink_unicast+0x3da/0x560 [ 45.065103] [] ? netlink_sendskb+0x40/0x40 [ 45.070958] [] netlink_sendmsg+0x9bb/0xb40 [ 45.076811] [] ? nlmsg_notify+0xf0/0xf0 [ 45.082405] [] ? __might_fault+0xf1/0x1b0 [ 45.088175] [] ? security_socket_sendmsg+0x6a/0xa0 [ 45.094770] [] ? nlmsg_notify+0xf0/0xf0 [ 45.100363] [] sock_sendmsg+0xb5/0xf0 [ 45.105799] [] SyS_sendto+0x1ca/0x290 [ 45.111218] [] ? SyS_getpeername+0x240/0x240 [ 45.117244] [] ? kmem_cache_free+0x312/0x430 [ 45.123274] [] ? mntput_no_expire+0xce/0x600 [ 45.129298] [] ? mnt_get_count+0x1c0/0x1c0 [ 45.135150] [] ? mntput+0x52/0x70 [ 45.140222] [] ? task_work_run+0x14a/0x200 [ 45.146075] [] ? trace_hardirqs_off+0xd/0x10 [ 45.152102] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 45.158650] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 45.165201] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 45.172906] Kernel Offset: disabled