[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.244' (ECDSA) to the list of known hosts. syzkaller login: [ 33.684915] audit: type=1400 audit(1597266875.274:8): avc: denied { execmem } for pid=6341 comm="syz-executor579" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 33.708151] IPVS: ftp: loaded support on port[0] = 21 [ 33.783630] chnl_net:caif_netlink_parms(): no params data found [ 33.913848] bridge0: port 1(bridge_slave_0) entered blocking state [ 33.920763] bridge0: port 1(bridge_slave_0) entered disabled state [ 33.928708] device bridge_slave_0 entered promiscuous mode [ 33.936510] bridge0: port 2(bridge_slave_1) entered blocking state [ 33.942879] bridge0: port 2(bridge_slave_1) entered disabled state [ 33.950457] device bridge_slave_1 entered promiscuous mode [ 33.968370] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 33.977405] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 33.995453] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 34.002742] team0: Port device team_slave_0 added [ 34.008877] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 34.016486] team0: Port device team_slave_1 added [ 34.031398] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 34.037728] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 34.063675] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 34.075514] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 34.081765] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 34.108093] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 34.119140] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 34.126907] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 34.145732] device hsr_slave_0 entered promiscuous mode [ 34.151803] device hsr_slave_1 entered promiscuous mode [ 34.159508] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 34.166968] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 34.228517] bridge0: port 2(bridge_slave_1) entered blocking state [ 34.234971] bridge0: port 2(bridge_slave_1) entered forwarding state [ 34.241844] bridge0: port 1(bridge_slave_0) entered blocking state [ 34.248257] bridge0: port 1(bridge_slave_0) entered forwarding state [ 34.276513] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 34.282584] 8021q: adding VLAN 0 to HW filter on device bond0 [ 34.291859] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.301422] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.320777] bridge0: port 1(bridge_slave_0) entered disabled state [ 34.328071] bridge0: port 2(bridge_slave_1) entered disabled state [ 34.338716] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 34.345081] 8021q: adding VLAN 0 to HW filter on device team0 [ 34.353233] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 34.362117] bridge0: port 1(bridge_slave_0) entered blocking state [ 34.368540] bridge0: port 1(bridge_slave_0) entered forwarding state [ 34.378389] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 34.387020] bridge0: port 2(bridge_slave_1) entered blocking state [ 34.393351] bridge0: port 2(bridge_slave_1) entered forwarding state [ 34.412581] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 34.422688] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 34.433621] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 34.440785] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 34.448636] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 34.456774] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 34.464262] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 34.472654] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 34.479494] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 34.492014] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 34.500102] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 34.507623] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 34.519745] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 34.569395] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 34.579423] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 34.609837] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 34.617266] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 34.623715] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 34.633468] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 34.641495] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 34.648841] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 34.657736] device veth0_vlan entered promiscuous mode [ 34.666583] device veth1_vlan entered promiscuous mode [ 34.672356] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 34.683844] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 34.696366] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 34.706346] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 34.713535] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 34.721664] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 34.730927] device veth0_macvtap entered promiscuous mode [ 34.737519] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 34.746093] device veth1_macvtap entered promiscuous mode [ 34.754959] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 34.764092] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 34.774754] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 34.781868] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 34.789785] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 34.798413] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 34.808317] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 34.816048] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 34.822777] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 34.831112] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 34.915320] BUG: spinlock recursion on CPU#1, syz-executor579/6342 [ 34.921846] lock: 0xffff8880873f8968, .magic: dead4ead, .owner: syz-executor579/6342, .owner_cpu: 1 [ 34.931666] CPU: 1 PID: 6342 Comm: syz-executor579 Not tainted 4.14.193-syzkaller #0 [ 34.939559] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.948981] Call Trace: [ 34.951547] dump_stack+0x1b2/0x283 [ 34.955153] do_raw_spin_lock+0x1a2/0x200 [ 34.959276] dev_mc_sync+0x10b/0x1c0 [ 34.963049] ? vlan_dev_set_mac_address+0x5c0/0x5c0 [ 34.968078] vlan_dev_set_rx_mode+0x38/0x80 [ 34.972377] __dev_set_rx_mode+0x191/0x2a0 [ 34.976606] dev_uc_unsync+0x16c/0x1c0 [ 34.980475] bond_enslave+0x2014/0x4b00 [ 34.984444] ? bond_update_slave_arr+0x670/0x670 [ 34.989175] ? nlmsg_notify+0x126/0x170 [ 34.993146] ? rtmsg_ifinfo+0xd4/0x100 [ 34.997020] ? __dev_notify_flags+0x12b/0x260 [ 35.001490] ? dev_change_name+0x6a0/0x6a0 [ 35.005723] ? vlan_dev_set_mac_address+0x110/0x5c0 [ 35.010802] ? bond_update_slave_arr+0x670/0x670 [ 35.015532] do_set_master+0x19e/0x200 [ 35.019393] rtnl_newlink+0x134c/0x1830 [ 35.023344] ? __lock_acquire+0x5fc/0x3f20 [ 35.027554] ? kmem_cache_free+0x7c/0x2b0 [ 35.031679] ? rtnl_dellink+0x6a0/0x6a0 [ 35.035713] ? trace_hardirqs_on+0x10/0x10 [ 35.039921] ? lock_acquire+0x170/0x3f0 [ 35.044059] ? lock_acquire+0x170/0x3f0 [ 35.048014] ? lock_downgrade+0x740/0x740 [ 35.052137] ? rtnl_dellink+0x6a0/0x6a0 [ 35.056086] rtnetlink_rcv_msg+0x3be/0xb10 [ 35.060294] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 35.064782] ? __netlink_lookup+0x345/0x5d0 [ 35.069300] ? netdev_pick_tx+0x2e0/0x2e0 [ 35.073429] netlink_rcv_skb+0x125/0x390 [ 35.077471] ? memcpy+0x35/0x50 [ 35.080806] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 35.085460] ? netlink_ack+0x9a0/0x9a0 [ 35.089418] netlink_unicast+0x437/0x610 [ 35.093458] ? netlink_sendskb+0xd0/0xd0 [ 35.097530] netlink_sendmsg+0x62e/0xb80 [ 35.101692] ? nlmsg_notify+0x170/0x170 [ 35.105643] ? kernel_recvmsg+0x210/0x210 [ 35.109880] ? security_socket_sendmsg+0x83/0xb0 [ 35.114699] ? nlmsg_notify+0x170/0x170 [ 35.118753] sock_sendmsg+0xb5/0x100 [ 35.122439] ___sys_sendmsg+0x6c8/0x800 [ 35.126387] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 35.131124] ? trace_hardirqs_on+0x10/0x10 [ 35.135342] ? trace_hardirqs_on+0x10/0x10 [ 35.139724] ? trace_hardirqs_on+0x10/0x10 [ 35.143934] ? trace_hardirqs_on+0x10/0x10 [ 35.148146] ? fs_reclaim_release+0xd0/0x110 [ 35.152540] ? __might_fault+0x104/0x1b0 [ 35.156586] ? lock_acquire+0x170/0x3f0 [ 35.160550] ? lock_downgrade+0x740/0x740 [ 35.164854] ? __might_fault+0x177/0x1b0 [ 35.168894] ? _copy_to_user+0x82/0xd0 [ 35.172753] ? move_addr_to_user+0x13f/0x180 [ 35.177139] ? __fdget+0x167/0x1f0 [ 35.180657] ? sockfd_lookup_light+0xb2/0x160 [ 35.185128] __sys_sendmsg+0xa3/0x120 [ 35.188900] ? SyS_shutdown+0x160/0x160 [ 35.192946] ? move_addr_to_kernel+0x60/0x60 [ 35.197482] SyS_sendmsg+0x27/0x40 [ 35.200999] ? __sys_sendmsg+0x120/0x120 [ 35.205302] do_syscall_64+0x1d5/0x640 [ 35.209189] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 35.214358] RIP: 0033:0x443cb9 [ 35.217523] RSP: 002b:00007ffe6431c508 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 35.225238] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443cb9 [ 35.232487] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000010 [ 35.239731] RBP: 00007ffe6431c520 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 35.246980] R10: 00000000bb1414ac R11: 0000000000000246 R12: 00007ffe6431c550 [ 35.254225] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000