[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 37.343123] IPVS: Creating netns size=2712 id=1 [ 37.348546] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. 2020/09/28 07:49:01 parsed 1 programs 2020/09/28 07:49:01 executed programs: 0 [ 45.186903] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 45.230475] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 45.232626] IPVS: Creating netns size=2712 id=2 [ 45.232774] IPVS: ftp: loaded support on port[0] = 21 [ 45.283105] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 45.291069] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 45.300877] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 45.310138] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 45.386207] IPVS: Creating netns size=2712 id=3 [ 45.391110] IPVS: ftp: loaded support on port[0] = 21 [ 45.540540] chnl_net:caif_netlink_parms(): no params data found [ 45.576482] IPVS: Creating netns size=2712 id=4 [ 45.581975] IPVS: ftp: loaded support on port[0] = 21 [ 45.799229] IPVS: Creating netns size=2712 id=5 [ 45.804070] IPVS: ftp: loaded support on port[0] = 21 [ 45.841459] chnl_net:caif_netlink_parms(): no params data found [ 46.039860] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.046381] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.056628] device bridge_slave_0 entered promiscuous mode [ 46.083239] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.090201] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.099935] device bridge_slave_1 entered promiscuous mode [ 46.125864] chnl_net:caif_netlink_parms(): no params data found [ 46.175995] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.208687] IPVS: Creating netns size=2712 id=6 [ 46.213509] IPVS: ftp: loaded support on port[0] = 21 [ 46.240692] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.391978] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.400364] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.410751] device bridge_slave_0 entered promiscuous mode [ 46.442039] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.449205] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.459422] device bridge_slave_1 entered promiscuous mode [ 46.603175] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 46.705244] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.718917] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 46.730028] IPVS: Creating netns size=2712 id=7 [ 46.734868] IPVS: ftp: loaded support on port[0] = 21 [ 46.754947] bridge0: port 1(bridge_slave_0) entered blocking state [ 46.761436] bridge0: port 1(bridge_slave_0) entered disabled state [ 46.770706] device bridge_slave_0 entered promiscuous mode [ 46.779039] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 46.848535] bridge0: port 2(bridge_slave_1) entered blocking state [ 46.854900] bridge0: port 2(bridge_slave_1) entered disabled state [ 46.864643] device bridge_slave_1 entered promiscuous mode [ 46.872045] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 46.942188] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.016174] chnl_net:caif_netlink_parms(): no params data found [ 47.110033] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 47.174269] chnl_net:caif_netlink_parms(): no params data found [ 47.192492] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 47.288577] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.335521] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.344044] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.409531] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.556015] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 47.649448] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 47.657220] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 47.679034] bridge0: port 1(bridge_slave_0) entered blocking state [ 47.685471] bridge0: port 1(bridge_slave_0) entered disabled state [ 47.695118] device bridge_slave_0 entered promiscuous mode [ 47.722928] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 47.800015] bridge0: port 2(bridge_slave_1) entered blocking state [ 47.806708] bridge0: port 2(bridge_slave_1) entered disabled state [ 47.815299] device bridge_slave_1 entered promiscuous mode [ 48.004940] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.025389] bridge0: port 1(bridge_slave_0) entered blocking state [ 48.032038] bridge0: port 1(bridge_slave_0) entered disabled state [ 48.041314] device bridge_slave_0 entered promiscuous mode [ 48.082055] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.110869] chnl_net:caif_netlink_parms(): no params data found [ 48.125619] bridge0: port 2(bridge_slave_1) entered blocking state [ 48.132380] bridge0: port 2(bridge_slave_1) entered disabled state [ 48.141453] device bridge_slave_1 entered promiscuous mode [ 48.189481] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 48.266254] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 48.382903] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 48.468338] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 48.642753] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 48.692154] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 48.791787] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 48.817828] ------------[ cut here ]------------ [ 48.822614] WARNING: CPU: 0 PID: 5901 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 48.832248] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 48.840046] Kernel panic - not syncing: panic_on_warn set ... [ 48.840046] [ 48.847392] CPU: 0 PID: 5901 Comm: syz-executor.5 Not tainted 4.6.0-syzkaller #0 [ 48.854894] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.864236] 0000000000000000 ffff8800b99eeef0 ffffffff836c94e1 1ffffffff11345ba [ 48.872210] 0000000041b58ab3 ffffffff882802cf ffffffff836c9324 ffff8800b99eeeb0 [ 48.880220] 0000000000000000 ffff8800b99eeeb8 ffffffff81586869 0000000000000562 [ 48.888210] Call Trace: [ 48.890770] [] dump_stack+0x1bd/0x29c [ 48.896208] [] ? _atomic_dec_and_lock+0xc4/0xc4 [ 48.902496] [] ? wake_up_klogd+0x89/0xe0 [ 48.908264] [] ? sysfs_warn_dup+0x7b/0xa0 [ 48.914031] [] panic+0x1bb/0x44a [ 48.919017] [] ? copy_signal+0xb38/0xb38 [ 48.924706] [] __warn+0x194/0x1d0 [ 48.929777] [] warn_slowpath_fmt+0x92/0xb0 [ 48.935644] [] ? __warn+0x1d0/0x1d0 [ 48.940901] [] ? kernfs_path_from_node+0x4a/0x60 [ 48.947287] [] sysfs_warn_dup+0x7b/0xa0 [ 48.952891] [] sysfs_do_create_link_sd+0xeb/0x110 [ 48.959353] [] sysfs_create_link+0x3f/0xb0 [ 48.965204] [] device_add+0x47c/0x15d0 [ 48.970723] [] ? device_private_init+0x230/0x230 [ 48.977099] [] ? kfree_const+0x1d/0x20 [ 48.982629] [] device_create_groups_vargs+0x1c8/0x220 [ 48.989462] [] device_create+0x88/0xa0 [ 48.994966] [] ? device_create_vargs+0x20/0x20 [ 49.001170] [] ? macvlan_set_mac_address+0x1c0/0x1c0 [ 49.007905] [] macvtap_device_event+0x228/0x350 [ 49.014193] [] notifier_call_chain+0xac/0x280 [ 49.020409] [] raw_notifier_call_chain+0x11/0x20 [ 49.026785] [] call_netdevice_notifiers_info+0x4c/0x90 [ 49.033696] [] register_netdevice+0x9d7/0x1310 [ 49.039910] [] ? dev_get_nest_level+0x1a9/0x2d0 [ 49.046199] [] ? netdev_change_features+0x80/0x80 [ 49.052662] [] macvlan_common_newlink+0xa15/0x1720 [ 49.059212] [] ? macvlan_uninit+0x160/0x160 [ 49.065166] [] ? alloc_netdev_mqs+0xa36/0xfd0 [ 49.071281] [] macvtap_newlink+0x128/0x230 [ 49.077136] [] ? macvtap_get_socket+0xa0/0xa0 [ 49.083250] [] ? rtnl_create_link+0x169/0xad0 [ 49.089364] [] ? __netlink_ns_capable+0xe2/0x150 [ 49.095738] [] rtnl_newlink+0xe5e/0x1780 [ 49.101417] [] ? rtnl_link_ops_get+0x62/0xa0 [ 49.107456] [] ? rtnl_newlink+0x36c/0x1780 [ 49.113312] [] ? rtnl_setlink+0x360/0x360 [ 49.119092] [] ? debug_check_no_locks_freed+0x4c0/0x4c0 [ 49.126074] [] ? mark_held_locks+0xff/0x280 [ 49.132014] [] ? trace_hardirqs_on_caller+0x49c/0x6f0 [ 49.138823] [] ? __netlink_ns_capable+0xe2/0x150 [ 49.145203] [] ? rtnl_setlink+0x360/0x360 [ 49.150969] [] rtnetlink_rcv_msg+0x22b/0xc20 [ 49.156998] [] ? mutex_lock_nested+0x617/0xca0 [ 49.163198] [] ? rtnetlink_rcv+0x16/0x30 [ 49.168879] [] ? rtnl_link_unregister+0x210/0x210 [ 49.175352] [] ? mutex_trylock+0x6b0/0x6b0 [ 49.181207] [] netlink_rcv_skb+0x1bb/0x2c0 [ 49.187060] [] ? rtnl_link_unregister+0x210/0x210 [ 49.193531] [] rtnetlink_rcv+0x25/0x30 [ 49.199083] [] netlink_unicast+0x419/0x630 [ 49.204950] [] ? netlink_sendskb+0x40/0x40 [ 49.210814] [] netlink_sendmsg+0x9a3/0xeb0 [ 49.216681] [] ? nlmsg_notify+0x120/0x120 [ 49.222464] [] ? nlmsg_notify+0x120/0x120 [ 49.228242] [] sock_sendmsg+0xdd/0x160 [ 49.233751] [] SyS_sendto+0x1dd/0x2d0 [ 49.239183] [] ? SyS_getpeername+0x270/0x270 [ 49.245224] [] ? mntput_no_expire+0xfb/0x7a0 [ 49.251280] [] ? mnt_get_count+0x2e0/0x2e0 [ 49.257161] [] ? mntput+0x57/0x80 [ 49.262236] [] ? mem_cgroup_oom_synchronize+0xb00/0xb00 [ 49.269222] [] ? trace_hardirqs_on_caller+0x49c/0x6f0 [ 49.276033] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 49.282585] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 49.290421] Kernel Offset: disabled