[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.042359] IPVS: Creating netns size=2712 id=1 [ 33.047355] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. 2020/08/12 16:51:47 parsed 1 programs 2020/08/12 16:51:47 executed programs: 0 [ 40.338049] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 40.347888] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 40.358176] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 40.369892] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 40.377963] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 40.386394] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 40.402228] IPVS: Creating netns size=2712 id=2 [ 40.407213] IPVS: ftp: loaded support on port[0] = 21 [ 40.478939] IPVS: Creating netns size=2712 id=3 [ 40.483776] IPVS: ftp: loaded support on port[0] = 21 [ 40.620335] chnl_net:caif_netlink_parms(): no params data found [ 40.663810] IPVS: Creating netns size=2712 id=4 [ 40.670341] IPVS: ftp: loaded support on port[0] = 21 [ 40.846630] chnl_net:caif_netlink_parms(): no params data found [ 40.887856] IPVS: Creating netns size=2712 id=5 [ 40.892992] IPVS: ftp: loaded support on port[0] = 21 [ 40.954096] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.960464] bridge0: port 1(bridge_slave_0) entered disabled state [ 40.969790] device bridge_slave_0 entered promiscuous mode [ 41.015452] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.021809] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.031536] device bridge_slave_1 entered promiscuous mode [ 41.191212] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.219478] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.240736] IPVS: Creating netns size=2712 id=6 [ 41.246331] IPVS: ftp: loaded support on port[0] = 21 [ 41.319991] chnl_net:caif_netlink_parms(): no params data found [ 41.359876] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.366347] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.376247] device bridge_slave_0 entered promiscuous mode [ 41.383643] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.390044] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.398703] device bridge_slave_1 entered promiscuous mode [ 41.542082] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.569274] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.599118] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.613162] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 41.622217] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 41.722768] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 41.733063] IPVS: Creating netns size=2712 id=7 [ 41.745966] IPVS: ftp: loaded support on port[0] = 21 [ 41.890004] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 41.955133] chnl_net:caif_netlink_parms(): no params data found [ 41.970177] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.124210] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.130568] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.140739] device bridge_slave_0 entered promiscuous mode [ 42.182992] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.189901] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.199165] device bridge_slave_1 entered promiscuous mode [ 42.278832] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.331935] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.339275] chnl_net:caif_netlink_parms(): no params data found [ 42.368385] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.412547] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.561840] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 42.666685] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 42.684141] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.690511] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.699584] device bridge_slave_0 entered promiscuous mode [ 42.820003] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.827528] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.837055] device bridge_slave_1 entered promiscuous mode [ 42.905379] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 42.916854] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.946953] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 42.956284] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.066914] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 43.166064] chnl_net:caif_netlink_parms(): no params data found [ 43.206107] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.213595] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.222173] device bridge_slave_0 entered promiscuous mode [ 43.230833] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.238067] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.246980] device bridge_slave_1 entered promiscuous mode [ 43.327204] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.356376] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.400568] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.435597] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.561188] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.601408] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.800858] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.819456] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.826255] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.835381] device bridge_slave_0 entered promiscuous mode [ 43.843350] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.851401] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.883872] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.890227] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.899394] device bridge_slave_1 entered promiscuous mode [ 43.906407] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.915694] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 43.956052] ------------[ cut here ]------------ [ 43.960808] WARNING: CPU: 1 PID: 5868 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 43.969674] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 43.977159] Kernel panic - not syncing: panic_on_warn set ... [ 43.977159] [ 43.984504] CPU: 1 PID: 5868 Comm: syz-executor.0 Not tainted 4.6.0-syzkaller #0 [ 43.992005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.001327] 0000000000000000 ffff8800b47b6fc8 ffffffff82c65e52 ffffffff85c81040 [ 44.009298] ffff8800b47b70a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009 [ 44.017264] ffff8800b47b7090 ffffffff8160d884 0000000041b58ab3 ffffffff868f05e2 [ 44.025232] Call Trace: [ 44.027789] [] dump_stack+0x136/0x1d4 [ 44.033207] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.038972] [] panic+0x1af/0x348 [ 44.043956] [] ? to_vmem_altmap+0x125/0x125 [ 44.049978] [] ? sysfs_warn_dup+0x7b/0xa0 [ 44.055741] [] __warn+0x18d/0x1b0 [ 44.060822] [] warn_slowpath_fmt+0x92/0xb0 [ 44.066672] [] ? __warn+0x1b0/0x1b0 [ 44.071922] [] ? kernfs_path_from_node+0x4a/0x60 [ 44.078298] [] sysfs_warn_dup+0x7b/0xa0 [ 44.083890] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 44.090869] [] sysfs_create_link+0x43/0xb0 [ 44.096722] [] device_add+0x677/0x1350 [ 44.102238] [] ? device_private_init+0x180/0x180 [ 44.108614] [] ? kfree_const+0x1d/0x20 [ 44.114121] [] ? kobject_set_name_vargs+0xb4/0x130 [ 44.120668] [] device_create_groups_vargs+0x1c8/0x220 [ 44.127481] [] device_create+0x88/0xa0 [ 44.132986] [] ? device_create_vargs+0x20/0x20 [ 44.139186] [] ? macvlan_set_mac_address+0x150/0x150 [ 44.145905] [] macvtap_device_event+0x1c4/0x2a0 [ 44.152192] [] notifier_call_chain+0x8b/0x170 [ 44.158404] [] raw_notifier_call_chain+0x11/0x20 [ 44.164865] [] call_netdevice_notifiers_info+0x47/0x80 [ 44.171759] [] register_netdevice+0x8e8/0xd00 [ 44.177873] [] ? netdev_change_features+0x80/0x80 [ 44.184332] [] ? dev_get_nest_level+0x10c/0x1a0 [ 44.190618] [] macvlan_common_newlink+0x8b9/0x1090 [ 44.197164] [] macvtap_newlink+0xbf/0x110 [ 44.202933] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.209217] [] rtnl_newlink+0xd4b/0x1230 [ 44.214894] [] ? rtnl_link_ops_get+0x5d/0x90 [ 44.220918] [] ? rtnl_newlink+0x319/0x1230 [ 44.226771] [] ? find_next_bit+0x15/0x20 [ 44.232465] [] ? rtnl_setlink+0x2f0/0x2f0 [ 44.238233] [] ? cpuacct_css_alloc+0x160/0x160 [ 44.244431] [] ? update_blocked_averages+0x8f7/0x1540 [ 44.251236] [] ? find_busiest_group+0x2510/0x2510 [ 44.257803] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 44.264785] [] ? __netlink_ns_capable+0xc7/0xf0 [ 44.271083] [] rtnetlink_rcv_msg+0x222/0x680 [ 44.277253] [] ? rtnetlink_rcv+0x30/0x30 [ 44.282934] [] ? mutex_lock_nested+0x5fd/0xb30 [ 44.289137] [] ? rtnetlink_rcv+0x16/0x30 [ 44.294821] [] ? netlink_seq_start+0xe0/0xe0 [ 44.300849] [] netlink_rcv_skb+0x242/0x350 [ 44.306715] [] ? rtnetlink_rcv+0x30/0x30 [ 44.312395] [] rtnetlink_rcv+0x25/0x30 [ 44.317901] [] netlink_unicast+0x3da/0x560 [ 44.323753] [] ? netlink_sendskb+0x40/0x40 [ 44.329605] [] netlink_sendmsg+0x9bb/0xb40 [ 44.335455] [] ? nlmsg_notify+0xf0/0xf0 [ 44.341047] [] ? __might_fault+0xf1/0x1b0 [ 44.346847] [] ? security_socket_sendmsg+0x6a/0xa0 [ 44.353393] [] ? nlmsg_notify+0xf0/0xf0 [ 44.359015] [] sock_sendmsg+0xb5/0xf0 [ 44.364432] [] SyS_sendto+0x1ca/0x290 [ 44.369847] [] ? SyS_getpeername+0x240/0x240 [ 44.375872] [] ? kmem_cache_free+0x312/0x430 [ 44.381896] [] ? mntput_no_expire+0xce/0x600 [ 44.387921] [] ? mnt_get_count+0x1c0/0x1c0 [ 44.393808] [] ? mntput+0x52/0x70 [ 44.398955] [] ? task_work_run+0x14a/0x200 [ 44.404806] [] ? trace_hardirqs_off+0xd/0x10 [ 44.410833] [] ? exit_to_usermode_loop+0x112/0x1c0 [ 44.417397] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 44.424031] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 44.431736] Kernel Offset: disabled