Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 47.938826] audit: type=1400 audit(1600682554.957:8): avc: denied { execmem } for pid=5751 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 47.979149] IPVS: Creating netns size=2712 id=1 [ 47.983941] IPVS: ftp: loaded support on port[0] = 21 [ 48.620600] audit: type=1400 audit(1600682555.638:9): avc: denied { create } for pid=5740 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 '10.128.15.194' (ECDSA) to the list of known hosts. 2020/09/21 10:02:43 parsed 1 programs 2020/09/21 10:02:43 executed programs: 0 [ 56.575298] audit: type=1400 audit(1600682563.594:10): avc: denied { execmem } for pid=5884 comm="syz-executor.2" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 56.668841] IPv6: ADDRCONF(NETDEV_CHANGE): nr0: link becomes ready [ 56.680367] IPv6: ADDRCONF(NETDEV_CHANGE): nr2: link becomes ready [ 56.702860] IPv6: ADDRCONF(NETDEV_CHANGE): nr3: link becomes ready [ 56.713273] IPv6: ADDRCONF(NETDEV_CHANGE): nr4: link becomes ready [ 56.724161] IPv6: ADDRCONF(NETDEV_CHANGE): nr1: link becomes ready [ 56.737444] IPVS: Creating netns size=2712 id=2 [ 56.738346] IPv6: ADDRCONF(NETDEV_CHANGE): nr5: link becomes ready [ 56.751036] IPVS: ftp: loaded support on port[0] = 21 [ 56.849356] IPVS: Creating netns size=2712 id=3 [ 56.854313] IPVS: ftp: loaded support on port[0] = 21 [ 57.015171] chnl_net:caif_netlink_parms(): no params data found [ 57.085178] IPVS: Creating netns size=2712 id=4 [ 57.090059] IPVS: ftp: loaded support on port[0] = 21 [ 57.396919] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.398475] IPVS: Creating netns size=2712 id=5 [ 57.398639] IPVS: ftp: loaded support on port[0] = 21 [ 57.414777] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.425061] device bridge_slave_0 entered promiscuous mode [ 57.445404] chnl_net:caif_netlink_parms(): no params data found [ 57.469575] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.476112] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.485841] device bridge_slave_1 entered promiscuous mode [ 57.659760] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 57.687734] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 57.864843] chnl_net:caif_netlink_parms(): no params data found [ 57.886992] IPVS: Creating netns size=2712 id=6 [ 57.901012] IPVS: ftp: loaded support on port[0] = 21 [ 57.934592] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 57.981970] batman_adv: Unable to register the batman interface 'batadv0': -12 [ 58.056931] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 58.112677] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.119050] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.129229] device bridge_slave_0 entered promiscuous mode [ 58.138350] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 58.155948] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.162846] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.173123] device bridge_slave_1 entered promiscuous mode [ 58.380899] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 58.398238] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 58.412018] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 58.427660] IPVS: Creating netns size=2712 id=7 [ 58.433876] IPVS: ftp: loaded support on port[0] = 21 [ 58.479571] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 58.613298] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.620380] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.629511] device bridge_slave_0 entered promiscuous mode [ 58.638788] chnl_net:caif_netlink_parms(): no params data found [ 58.672973] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.679420] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.689976] device bridge_slave_1 entered promiscuous mode [ 58.968646] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.021353] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.100718] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.182810] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.452190] chnl_net:caif_netlink_parms(): no params data found [ 59.514428] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.521207] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.531943] device bridge_slave_0 entered promiscuous mode [ 59.540536] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.546957] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.557493] device bridge_slave_1 entered promiscuous mode [ 59.611464] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 59.728233] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 59.737891] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 59.772913] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 59.806064] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 59.840768] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 59.882955] chnl_net:caif_netlink_parms(): no params data found [ 60.009839] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 60.056164] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 60.068398] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready [ 60.311702] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.318157] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.331492] device bridge_slave_0 entered promiscuous mode [ 60.393020] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.399613] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.410022] device bridge_slave_1 entered promiscuous mode [ 60.441868] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 60.538154] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 60.583642] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 60.667086] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 60.728123] bridge0: port 1(bridge_slave_0) entered blocking state [ 60.735992] bridge0: port 1(bridge_slave_0) entered disabled state [ 60.745998] device bridge_slave_0 entered promiscuous mode [ 60.802542] bridge0: port 2(bridge_slave_1) entered blocking state [ 60.809343] bridge0: port 2(bridge_slave_1) entered disabled state [ 60.818452] device bridge_slave_1 entered promiscuous mode [ 60.914798] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 60.942561] ------------[ cut here ]------------ [ 60.947345] WARNING: CPU: 1 PID: 5895 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 [ 60.955451] sysfs: cannot create duplicate filename '/class/macvtap/tap50' [ 60.962503] Kernel panic - not syncing: panic_on_warn set ... [ 60.962503] [ 60.969857] CPU: 1 PID: 5895 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0 [ 60.977470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.986807] 0000000000000000 ffff88012936eef0 ffffffff836c94e1 1ffffffff11345ba [ 60.994977] 0000000041b58ab3 ffffffff882802cf ffffffff836c9324 ffff88012936eeb0 [ 61.002945] 0000000000000000 ffff88012936eeb8 ffffffff81586869 000000000000056e [ 61.010939] Call Trace: [ 61.013502] [] dump_stack+0x1bd/0x29c [ 61.018924] [] ? _atomic_dec_and_lock+0xc4/0xc4 [ 61.025213] [] ? wake_up_klogd+0x89/0xe0 [ 61.030893] [] ? sysfs_warn_dup+0x7b/0xa0 [ 61.036662] [] panic+0x1bb/0x44a [ 61.041647] [] ? copy_signal+0xb38/0xb38 [ 61.047326] [] __warn+0x194/0x1d0 [ 61.052410] [] warn_slowpath_fmt+0x92/0xb0 [ 61.058261] [] ? __warn+0x1d0/0x1d0 [ 61.063507] [] ? kernfs_path_from_node+0x4a/0x60 [ 61.070089] [] sysfs_warn_dup+0x7b/0xa0 [ 61.075697] [] sysfs_do_create_link_sd+0xeb/0x110 [ 61.082157] [] sysfs_create_link+0x3f/0xb0 [ 61.088025] [] device_add+0x47c/0x15d0 [ 61.093550] [] ? device_private_init+0x230/0x230 [ 61.099952] [] ? kfree_const+0x1d/0x20 [ 61.105480] [] device_create_groups_vargs+0x1c8/0x220 [ 61.112296] [] device_create+0x88/0xa0 [ 61.117817] [] ? device_create_vargs+0x20/0x20 [ 61.124022] [] ? macvlan_set_mac_address+0x1c0/0x1c0 [ 61.130782] [] macvtap_device_event+0x228/0x350 [ 61.137093] [] notifier_call_chain+0xac/0x280 [ 61.143239] [] raw_notifier_call_chain+0x11/0x20 [ 61.149720] [] call_netdevice_notifiers_info+0x4c/0x90 [ 61.156632] [] register_netdevice+0x9d7/0x1310 [ 61.162833] [] ? dev_get_nest_level+0x1a9/0x2d0 [ 61.169122] [] ? netdev_change_features+0x80/0x80 [ 61.175604] [] macvlan_common_newlink+0xa15/0x1720 [ 61.182163] [] ? macvlan_uninit+0x160/0x160 [ 61.188107] [] ? alloc_netdev_mqs+0xa36/0xfd0 [ 61.194228] [] macvtap_newlink+0x128/0x230 [ 61.200087] [] ? macvtap_get_socket+0xa0/0xa0 [ 61.206224] [] ? rtnl_create_link+0x169/0xad0 [ 61.212503] [] ? __netlink_ns_capable+0xe2/0x150 [ 61.218892] [] rtnl_newlink+0xe5e/0x1780 [ 61.224590] [] ? rtnl_link_ops_get+0x62/0xa0 [ 61.230624] [] ? rtnl_newlink+0x36c/0x1780 [ 61.236576] [] ? rtnl_setlink+0x360/0x360 [ 61.242351] [] ? avc_has_perm_noaudit+0x178/0x2e0 [ 61.248823] [] ? avc_has_perm_noaudit+0x76/0x2e0 [ 61.255211] [] ? avc_has_extended_perms+0x13c0/0x13c0 [ 61.262021] [] ? debug_check_no_locks_freed+0x4c0/0x4c0 [ 61.269018] [] ? mark_held_locks+0xff/0x280 [ 61.274978] [] ? selinux_capset+0x170/0x170 [ 61.280970] [] ? __netlink_ns_capable+0xe2/0x150 [ 61.287435] [] ? rtnl_setlink+0x360/0x360 [ 61.293214] [] rtnetlink_rcv_msg+0x22b/0xc20 [ 61.299242] [] ? mutex_lock_nested+0x617/0xca0 [ 61.305553] [] ? rtnetlink_rcv+0x16/0x30 [ 61.311368] [] ? rtnl_link_unregister+0x210/0x210 [ 61.317836] [] ? mutex_trylock+0x6b0/0x6b0 [ 61.323697] [] netlink_rcv_skb+0x1bb/0x2c0 [ 61.329556] [] ? rtnl_link_unregister+0x210/0x210 [ 61.336027] [] rtnetlink_rcv+0x25/0x30 [ 61.341533] [] netlink_unicast+0x419/0x630 [ 61.347402] [] ? netlink_sendskb+0x40/0x40 [ 61.353269] [] netlink_sendmsg+0x9a3/0xeb0 [ 61.359137] [] ? nlmsg_notify+0x120/0x120 [ 61.364902] [] ? selinux_socket_sendmsg+0x3f/0x60 [ 61.371378] [] ? security_socket_sendmsg+0x6f/0xb0 [ 61.377923] [] ? nlmsg_notify+0x120/0x120 [ 61.383700] [] sock_sendmsg+0xdd/0x160 [ 61.389219] [] SyS_sendto+0x1dd/0x2d0 [ 61.394652] [] ? SyS_getpeername+0x270/0x270 [ 61.400683] [] ? mntput_no_expire+0xfb/0x7a0 [ 61.406718] [] ? mnt_get_count+0x2e0/0x2e0 [ 61.412573] [] ? mntput+0x57/0x80 [ 61.417663] [] ? mem_cgroup_oom_synchronize+0xb00/0xb00 [ 61.424666] [] ? trace_hardirqs_on_caller+0x49c/0x6f0 [ 61.431492] [] ? trace_hardirqs_on_thunk+0x1b/0x1d [ 61.438076] [] entry_SYSCALL_64_fastpath+0x23/0xc1 [ 61.446074] Kernel Offset: disabled