Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 33.053223] IPVS: Creating netns size=2712 id=1 [ 33.058373] IPVS: ftp: loaded support on port[0] = 21 Warning: Permanently added '10.128.0.139' (ECDSA) to the list of known hosts. 2020/04/07 05:04:12 parsed 1 programs 2020/04/07 05:04:12 executed programs: 0 [ 41.684648] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 41.700435] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 41.709418] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 41.718010] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 41.728732] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 41.738264] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 41.755019] IPVS: Creating netns size=2712 id=2 [ 41.759829] IPVS: ftp: loaded support on port[0] = 21 [ 41.836343] IPVS: Creating netns size=2712 id=3 [ 41.842274] IPVS: ftp: loaded support on port[0] = 21 [ 42.001521] chnl_net:caif_netlink_parms(): no params data found [ 42.036266] IPVS: Creating netns size=2712 id=4 [ 42.041476] IPVS: ftp: loaded support on port[0] = 21 [ 42.256785] IPVS: Creating netns size=2712 id=5 [ 42.262977] IPVS: ftp: loaded support on port[0] = 21 [ 42.296319] chnl_net:caif_netlink_parms(): no params data found [ 42.417175] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.424025] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.433875] device bridge_slave_0 entered promiscuous mode [ 42.531501] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.539207] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.549563] device bridge_slave_1 entered promiscuous mode [ 42.620758] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 42.658821] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 42.676494] chnl_net:caif_netlink_parms(): no params data found [ 42.685260] IPVS: Creating netns size=2712 id=6 [ 42.685337] IPVS: ftp: loaded support on port[0] = 21 [ 43.001199] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.009526] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.019920] device bridge_slave_0 entered promiscuous mode [ 43.060048] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.066484] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.076715] device bridge_slave_1 entered promiscuous mode [ 43.100365] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.171402] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 43.181350] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 43.189721] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 43.200760] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.218934] chnl_net:caif_netlink_parms(): no params data found [ 43.227551] IPVS: Creating netns size=2712 id=7 [ 43.234480] IPVS: ftp: loaded support on port[0] = 21 [ 43.291924] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.418324] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.424727] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.434431] device bridge_slave_0 entered promiscuous mode [ 43.480296] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.486823] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.496635] device bridge_slave_1 entered promiscuous mode [ 43.572277] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 43.667001] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 43.720863] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 43.785467] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 43.882823] chnl_net:caif_netlink_parms(): no params data found [ 43.935985] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.002125] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.153227] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.160473] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.170402] device bridge_slave_0 entered promiscuous mode [ 44.254000] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.261306] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.271646] device bridge_slave_1 entered promiscuous mode [ 44.430300] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.439646] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.461801] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.471870] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.480655] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.529321] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.663580] chnl_net:caif_netlink_parms(): no params data found [ 44.765828] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.843916] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.888270] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.894716] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.904982] device bridge_slave_0 entered promiscuous mode [ 44.979369] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.985894] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.995921] device bridge_slave_1 entered promiscuous mode [ 45.011347] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 45.093073] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 45.100886] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 45.217066] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 45.278987] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 45.451307] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 45.469547] bridge0: port 1(bridge_slave_0) entered blocking state [ 45.475955] bridge0: port 1(bridge_slave_0) entered disabled state [ 45.485741] device bridge_slave_0 entered promiscuous mode [ 45.502679] ------------[ cut here ]------------ [ 45.509685] WARNING: CPU: 1 PID: 5915 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 45.517543] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 45.524545] Kernel panic - not syncing: panic_on_warn set ... [ 45.524545] [ 45.531887] CPU: 1 PID: 5915 Comm: syz-executor.2 Not tainted 4.6.0-syzkaller #0 [ 45.539395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.548823] 0000000000000000 ffff8800b2f46fc8 ffffffff82c65932 ffffffff85c81040 [ 45.556832] ffff8800b2f470a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 45.564858] ffff8800b2f47090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 45.573067] Call Trace: [ 45.575637] [] dump_stack+0x136/0x1d4 [ 45.581070] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.586864] [] panic+0x1af/0x348 [ 45.591859] [] ? to_vmem_altmap+0x125/0x125 [ 45.597809] [] ? sysfs_warn_dup+0x7b/0xa0 [ 45.603584] [] __warn+0x18d/0x1b0 [ 45.608796] [] warn_slowpath_fmt+0x92/0xb0 [ 45.614885] [] ? __warn+0x1b0/0x1b0 [ 45.620150] [] ? kernfs_path_from_node+0x4a/0x60 [ 45.626531] [] sysfs_warn_dup+0x7b/0xa0 [ 45.632282] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 45.639377] [] sysfs_create_link+0x43/0xb0 [ 45.645251] [] device_add+0x677/0x1350 [ 45.650852] [] ? device_private_init+0x180/0x180 [ 45.657244] [] ? kfree_const+0x1d/0x20 [ 45.662882] [] ? kobject_set_name_vargs+0xb4/0x130 [ 45.669467] [] device_create_groups_vargs+0x1c8/0x220 [ 45.676291] [] device_create+0x88/0xa0 [ 45.681803] [] ? device_create_vargs+0x20/0x20 [ 45.689076] [] ? macvlan_set_mac_address+0x150/0x150 [ 45.695801] [] macvtap_device_event+0x1c4/0x2a0 [ 45.702104] [] notifier_call_chain+0x8b/0x170 [ 45.708223] [] raw_notifier_call_chain+0x11/0x20 [ 45.714612] [] call_netdevice_notifiers_info+0x47/0x80 [ 45.721523] [] register_netdevice+0x8e8/0xd00 [ 45.727765] [] ? netdev_change_features+0x80/0x80 [ 45.734232] [] ? dev_get_nest_level+0x10c/0x1a0 [ 45.740528] [] macvlan_common_newlink+0x8b9/0x1090 [ 45.747086] [] macvtap_newlink+0xbf/0x110 [ 45.752859] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.759156] [] rtnl_newlink+0xd4b/0x1230 [ 45.764850] [] ? rtnl_link_ops_get+0x5d/0x90 [ 45.770889] [] ? rtnl_newlink+0x319/0x1230 [ 45.776746] [] ? find_next_bit+0x15/0x20 [ 45.782627] [] ? rtnl_setlink+0x2f0/0x2f0 [ 45.788444] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.795185] [] ? __lock_acquire+0x15c3/0x5990 [ 45.801321] [] ? update_blocked_averages+0x8f7/0x1540 [ 45.808240] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 45.815238] [] ? __netlink_ns_capable+0xc7/0xf0 [ 45.821534] [] rtnetlink_rcv_msg+0x222/0x680 [ 45.827568] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 45.834389] [] ? rtnetlink_rcv+0x30/0x30 [ 45.840074] [] ? mutex_lock_nested+0x5fd/0xb30 [ 45.846364] [] ? rtnetlink_rcv+0x16/0x30 [ 45.852058] [] ? netlink_seq_start+0xe0/0xe0 [ 45.858088] [] netlink_rcv_skb+0x242/0x350 [ 45.864145] [] ? rtnetlink_rcv+0x30/0x30 [ 45.870001] [] rtnetlink_rcv+0x25/0x30 [ 45.875525] [] netlink_unicast+0x3da/0x560 [ 45.881397] [] ? netlink_sendskb+0x40/0x40 [ 45.887322] [] netlink_sendmsg+0x9bb/0xb40 [ 45.893285] [] ? nlmsg_notify+0xf0/0xf0 [ 45.898886] [] ? __might_fault+0xf1/0x1b0 [ 45.904657] [] ? nlmsg_notify+0xf0/0xf0 [ 45.910282] [] sock_sendmsg+0xb5/0xf0 [ 45.915728] [] SyS_sendto+0x1ca/0x290 [ 45.921149] [] ? SyS_getpeername+0x240/0x240 [ 45.927192] [] ? mntput_no_expire+0xce/0x600 [ 45.933225] [] ? mnt_get_count+0x1c0/0x1c0 [ 45.939093] [] ? mntput+0x52/0x70 [ 45.944182] [] ? task_work_run+0x14a/0x200 [ 45.950049] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 45.956874] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 45.963437] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 45.971808] Kernel Offset: disabled