[ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 44.668548] audit: type=1400 audit(1587560373.082:8): avc: denied { execmem } for pid=5737 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 44.703111] IPVS: Creating netns size=2712 id=1 [ 44.708091] IPVS: ftp: loaded support on port[0] = 21 [ 45.315226] audit: type=1400 audit(1587560373.723:9): avc: denied { create } for pid=5716 comm="syz-fuzzer" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1 Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. 2020/04/22 12:59:41 parsed 1 programs 2020/04/22 12:59:41 executed programs: 0 [ 53.451246] audit: type=1400 audit(1587560381.857:10): avc: denied { execmem } for pid=5880 comm="syz-executor.1" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 53.476175] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 53.503241] IPVS: Creating netns size=2712 id=2 [ 53.518931] IPVS: ftp: loaded support on port[0] = 21 [ 53.541805] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 53.565019] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 53.573223] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 53.588071] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 53.616648] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 53.659459] IPVS: Creating netns size=2712 id=3 [ 53.665174] IPVS: ftp: loaded support on port[0] = 21 [ 53.823626] chnl_net:caif_netlink_parms(): no params data found [ 53.861473] IPVS: Creating netns size=2712 id=4 [ 53.866311] IPVS: ftp: loaded support on port[0] = 21 [ 54.066325] IPVS: Creating netns size=2712 id=5 [ 54.073525] IPVS: ftp: loaded support on port[0] = 21 [ 54.102686] chnl_net:caif_netlink_parms(): no params data found [ 54.255649] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.263032] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.273000] device bridge_slave_0 entered promiscuous mode [ 54.378601] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.385210] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.394577] device bridge_slave_1 entered promiscuous mode [ 54.435428] IPVS: Creating netns size=2712 id=6 [ 54.440690] IPVS: ftp: loaded support on port[0] = 21 [ 54.488875] chnl_net:caif_netlink_parms(): no params data found [ 54.507188] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 54.529712] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 54.827755] bridge0: port 1(bridge_slave_0) entered blocking state [ 54.834810] bridge0: port 1(bridge_slave_0) entered disabled state [ 54.844957] device bridge_slave_0 entered promiscuous mode [ 54.873043] IPVS: Creating netns size=2712 id=7 [ 54.877875] IPVS: ftp: loaded support on port[0] = 21 [ 54.914245] bridge0: port 2(bridge_slave_1) entered blocking state [ 54.923791] bridge0: port 2(bridge_slave_1) entered disabled state [ 54.933521] device bridge_slave_1 entered promiscuous mode [ 54.971382] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 55.018358] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 55.050738] chnl_net:caif_netlink_parms(): no params data found [ 55.132503] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.143137] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.155928] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.189768] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 55.459532] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.467028] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.477395] device bridge_slave_0 entered promiscuous mode [ 55.484990] chnl_net:caif_netlink_parms(): no params data found [ 55.501991] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 55.509266] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.517794] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.529530] device bridge_slave_1 entered promiscuous mode [ 55.545184] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 55.604015] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 55.676743] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 55.688579] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 55.700365] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 55.821641] bridge0: port 1(bridge_slave_0) entered blocking state [ 55.828067] bridge0: port 1(bridge_slave_0) entered disabled state [ 55.838483] device bridge_slave_0 entered promiscuous mode [ 55.884114] bridge0: port 2(bridge_slave_1) entered blocking state [ 55.890870] bridge0: port 2(bridge_slave_1) entered disabled state [ 55.902987] device bridge_slave_1 entered promiscuous mode [ 56.095452] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.128754] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.220947] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.227797] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.234325] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.243399] device bridge_slave_0 entered promiscuous mode [ 56.252093] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.262284] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.316489] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.323023] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.333045] device bridge_slave_1 entered promiscuous mode [ 56.340117] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 56.546619] chnl_net:caif_netlink_parms(): no params data found [ 56.596375] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 56.654549] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 56.664845] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 56.672901] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 56.903999] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 56.936533] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 56.983650] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.187443] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 57.194712] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 57.203182] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 57.223684] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 57.375386] ------------[ cut here ]------------ [ 57.380309] WARNING: CPU: 0 PID: 5887 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 57.388074] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 57.395133] Kernel panic - not syncing: panic_on_warn set ... [ 57.395133] [ 57.402479] CPU: 0 PID: 5887 Comm: syz-executor.4 Not tainted 4.6.0-syzkaller #0 [ 57.409988] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.419324] 0000000000000000 ffff88012920efc8 ffffffff82c65932 ffffffff85c81040 [ 57.427310] ffff88012920f0a0 ffffffff85d2bb00 ffffffff8191b86b 0000000000000009 [ 57.435298] ffff88012920f090 ffffffff8160d374 0000000041b58ab3 ffffffff868f058a [ 57.443310] Call Trace: [ 57.445874] [] dump_stack+0x136/0x1d4 [ 57.452273] [] ? sysfs_warn_dup+0x7b/0xa0 [ 57.458050] [] panic+0x1af/0x348 [ 57.463035] [] ? to_vmem_altmap+0x125/0x125 [ 57.468977] [] ? sysfs_warn_dup+0x7b/0xa0 [ 57.474749] [] __warn+0x18d/0x1b0 [ 57.479821] [] warn_slowpath_fmt+0x92/0xb0 [ 57.485673] [] ? __warn+0x1b0/0x1b0 [ 57.490921] [] ? kernfs_path_from_node+0x4a/0x60 [ 57.497330] [] sysfs_warn_dup+0x7b/0xa0 [ 57.502924] [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 [ 57.509906] [] sysfs_create_link+0x43/0xb0 [ 57.515761] [] device_add+0x677/0x1350 [ 57.521268] [] ? device_private_init+0x180/0x180 [ 57.527647] [] ? kfree_const+0x1d/0x20 [ 57.533157] [] ? kobject_set_name_vargs+0xb4/0x130 [ 57.539793] [] device_create_groups_vargs+0x1c8/0x220 [ 57.546602] [] device_create+0x88/0xa0 [ 57.552125] [] ? device_create_vargs+0x20/0x20 [ 57.558326] [] ? macvlan_set_mac_address+0x150/0x150 [ 57.565049] [] macvtap_device_event+0x1c4/0x2a0 [ 57.571359] [] notifier_call_chain+0x8b/0x170 [ 57.577487] [] raw_notifier_call_chain+0x11/0x20 [ 57.583862] [] call_netdevice_notifiers_info+0x47/0x80 [ 57.590775] [] register_netdevice+0x8e8/0xd00 [ 57.596906] [] ? netdev_change_features+0x80/0x80 [ 57.603388] [] ? dev_get_nest_level+0x10c/0x1a0 [ 57.609677] [] macvlan_common_newlink+0x8b9/0x1090 [ 57.616224] [] macvtap_newlink+0xbf/0x110 [ 57.621991] [] ? __netlink_ns_capable+0xc7/0xf0 [ 57.628282] [] rtnl_newlink+0xd4b/0x1230 [ 57.633963] [] ? rtnl_link_ops_get+0x5d/0x90 [ 57.639991] [] ? rtnl_newlink+0x319/0x1230 [ 57.645846] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 57.652570] [] ? rtnl_setlink+0x2f0/0x2f0 [ 57.658352] [] ? avc_has_perm_noaudit+0x148/0x270 [ 57.664839] [] ? avc_has_perm_noaudit+0x165/0x270 [ 57.671303] [] ? avc_has_perm_noaudit+0x69/0x270 [ 57.677680] [] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 57.684662] [] ? cred_has_capability.isra.35+0xe9/0x1d0 [ 57.691668] [] ? __netlink_ns_capable+0xc7/0xf0 [ 57.697974] [] rtnetlink_rcv_msg+0x222/0x680 [ 57.704003] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 57.710812] [] ? rtnetlink_rcv+0x30/0x30 [ 57.716492] [] ? mutex_lock_nested+0x5fd/0xb30 [ 57.722691] [] ? rtnetlink_rcv+0x16/0x30 [ 57.728369] [] ? netlink_seq_start+0xe0/0xe0 [ 57.734418] [] netlink_rcv_skb+0x242/0x350 [ 57.740274] [] ? rtnetlink_rcv+0x30/0x30 [ 57.745966] [] rtnetlink_rcv+0x25/0x30 [ 57.751472] [] netlink_unicast+0x3da/0x560 [ 57.757324] [] ? netlink_sendskb+0x40/0x40 [ 57.763197] [] netlink_sendmsg+0x9bb/0xb40 [ 57.769055] [] ? nlmsg_notify+0xf0/0xf0 [ 57.774671] [] ? selinux_socket_sendmsg+0x3a/0x50 [ 57.781154] [] ? security_socket_sendmsg+0x6a/0xa0 [ 57.787700] [] ? nlmsg_notify+0xf0/0xf0 [ 57.793309] [] sock_sendmsg+0xb5/0xf0 [ 57.798728] [] SyS_sendto+0x1ca/0x290 [ 57.804149] [] ? SyS_getpeername+0x240/0x240 [ 57.810177] [] ? mntput_no_expire+0xce/0x600 [ 57.816306] [] ? mnt_get_count+0x1c0/0x1c0 [ 57.822160] [] ? mntput+0x52/0x70 [ 57.827233] [] ? task_work_run+0x14a/0x200 [ 57.833108] [] ? trace_hardirqs_on_caller+0x49e/0x5c0 [ 57.839926] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 57.846481] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 57.854328] Kernel Offset: disabled