Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. syzkaller login: [ 36.047964] audit: type=1400 audit(1597942432.660:8): avc: denied { execmem } for pid=6355 comm="syz-executor903" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 36.070403] IPVS: ftp: loaded support on port[0] = 21 [ 36.150158] chnl_net:caif_netlink_parms(): no params data found [ 36.203858] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.211396] bridge0: port 1(bridge_slave_0) entered disabled state [ 36.218541] device bridge_slave_0 entered promiscuous mode [ 36.226800] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.233621] bridge0: port 2(bridge_slave_1) entered disabled state [ 36.241071] device bridge_slave_1 entered promiscuous mode [ 36.257798] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 36.266982] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 36.287746] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 36.295241] team0: Port device team_slave_0 added [ 36.301248] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 36.308458] team0: Port device team_slave_1 added [ 36.325146] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 36.331748] 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. [ 36.357780] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 36.369703] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 36.375973] 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. [ 36.401318] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 36.412009] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 36.419818] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 36.438852] device hsr_slave_0 entered promiscuous mode [ 36.444577] device hsr_slave_1 entered promiscuous mode [ 36.451117] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 36.458276] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 36.526416] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.533105] bridge0: port 2(bridge_slave_1) entered forwarding state [ 36.540159] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.546552] bridge0: port 1(bridge_slave_0) entered forwarding state [ 36.580404] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 36.586549] 8021q: adding VLAN 0 to HW filter on device bond0 [ 36.596156] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.606032] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 36.625363] bridge0: port 1(bridge_slave_0) entered disabled state [ 36.633262] bridge0: port 2(bridge_slave_1) entered disabled state [ 36.643557] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 36.650451] 8021q: adding VLAN 0 to HW filter on device team0 [ 36.660389] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 36.668060] bridge0: port 1(bridge_slave_0) entered blocking state [ 36.674796] bridge0: port 1(bridge_slave_0) entered forwarding state [ 36.685465] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 36.694483] bridge0: port 2(bridge_slave_1) entered blocking state [ 36.701376] bridge0: port 2(bridge_slave_1) entered forwarding state [ 36.719551] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 36.727472] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 36.735854] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 36.746933] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 36.759777] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 36.771430] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 36.777746] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 36.786075] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 36.799091] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 36.809502] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 36.816281] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 36.826217] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 36.896612] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 36.907179] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 36.941312] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 36.949137] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 36.955682] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 36.966675] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 36.976307] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 36.984532] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 36.995114] device veth0_vlan entered promiscuous mode [ 37.007845] device veth1_vlan entered promiscuous mode [ 37.014863] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 37.024325] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 37.036404] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 37.047046] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 37.054581] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 37.062671] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 37.073898] device veth0_macvtap entered promiscuous mode [ 37.080481] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 37.088890] device veth1_macvtap entered promiscuous mode [ 37.098786] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 37.108489] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 37.118515] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 37.125611] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 37.135645] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 37.144556] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 37.158866] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 37.165812] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 37.172990] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 37.181566] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 37.291086] BUG: spinlock recursion on CPU#0, syz-executor903/6356 [ 37.297599] lock: 0xffff888097a70da8, .magic: dead4ead, .owner: syz-executor903/6356, .owner_cpu: 0 [ 37.307403] CPU: 0 PID: 6356 Comm: syz-executor903 Not tainted 4.14.193-syzkaller #0 [ 37.315330] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.324703] Call Trace: [ 37.327332] dump_stack+0x1b2/0x283 [ 37.330995] do_raw_spin_lock+0x1a2/0x200 [ 37.335173] dev_mc_sync+0x10b/0x1c0 [ 37.338894] ? vlan_dev_set_mac_address+0x5c0/0x5c0 [ 37.343922] vlan_dev_set_rx_mode+0x38/0x80 [ 37.348265] __dev_set_rx_mode+0x191/0x2a0 [ 37.352509] dev_uc_unsync+0x16c/0x1c0 [ 37.356410] bond_enslave+0x2014/0x4b00 [ 37.360419] ? bond_update_slave_arr+0x670/0x670 [ 37.365188] ? nlmsg_notify+0x126/0x170 [ 37.369170] ? rtmsg_ifinfo+0xd4/0x100 [ 37.373060] ? __dev_notify_flags+0x12b/0x260 [ 37.377568] ? dev_change_name+0x6a0/0x6a0 [ 37.381813] ? bond_update_slave_arr+0x670/0x670 [ 37.386583] do_set_master+0x19e/0x200 [ 37.390461] rtnl_newlink+0x134c/0x1830 [ 37.394426] ? __lock_acquire+0x5fc/0x3f20 [ 37.398659] ? kmem_cache_free+0x7c/0x2b0 [ 37.402812] ? rtnl_dellink+0x6a0/0x6a0 [ 37.406801] ? trace_hardirqs_on+0x10/0x10 [ 37.411064] ? lock_acquire+0x170/0x3f0 [ 37.415088] ? lock_acquire+0x170/0x3f0 [ 37.419063] ? lock_downgrade+0x740/0x740 [ 37.423205] ? rtnl_dellink+0x6a0/0x6a0 [ 37.427203] rtnetlink_rcv_msg+0x3be/0xb10 [ 37.431462] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 37.435986] ? __netlink_lookup+0x345/0x5d0 [ 37.440318] ? netdev_pick_tx+0x2e0/0x2e0 [ 37.444474] netlink_rcv_skb+0x125/0x390 [ 37.448554] ? memcpy+0x35/0x50 [ 37.451884] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 37.456412] ? netlink_ack+0x9a0/0x9a0 [ 37.460299] netlink_unicast+0x437/0x610 [ 37.464383] ? netlink_sendskb+0xd0/0xd0 [ 37.468466] netlink_sendmsg+0x62e/0xb80 [ 37.472541] ? nlmsg_notify+0x170/0x170 [ 37.476558] ? kernel_recvmsg+0x210/0x210 [ 37.480702] ? security_socket_sendmsg+0x83/0xb0 [ 37.485478] ? nlmsg_notify+0x170/0x170 [ 37.489466] sock_sendmsg+0xb5/0x100 [ 37.493222] ___sys_sendmsg+0x6c8/0x800 [ 37.497197] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 37.501945] ? trace_hardirqs_on+0x10/0x10 [ 37.506172] ? trace_hardirqs_on+0x10/0x10 [ 37.510414] ? trace_hardirqs_on+0x10/0x10 [ 37.514690] ? trace_hardirqs_on+0x10/0x10 [ 37.518918] ? fs_reclaim_release+0xd0/0x110 [ 37.523335] ? __might_fault+0x104/0x1b0 [ 37.527406] ? lock_acquire+0x170/0x3f0 [ 37.531406] ? lock_downgrade+0x740/0x740 [ 37.535588] ? __might_fault+0x177/0x1b0 [ 37.539673] ? _copy_to_user+0x82/0xd0 [ 37.543551] ? move_addr_to_user+0x13f/0x180 [ 37.547981] ? __fdget+0x167/0x1f0 [ 37.551539] ? sockfd_lookup_light+0xb2/0x160 [ 37.556035] __sys_sendmsg+0xa3/0x120 [ 37.559850] ? SyS_shutdown+0x160/0x160 [ 37.563898] ? move_addr_to_kernel+0x60/0x60 [ 37.568300] SyS_sendmsg+0x27/0x40 [ 37.571845] ? __sys_sendmsg+0x120/0x120 [ 37.575892] do_syscall_64+0x1d5/0x640 [ 37.579787] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 37.585009] RIP: 0033:0x443b89 [ 37.588216] RSP: 002b:00007ffe73c87108 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 37.595937] RAX: ffffffffffffffda RBX: 000000000000000d RCX: 0000000000443b89 [ 37.603225] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000010 [ 37.610532] RBP: 00000000024c8850 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 37.617868] R10: 00000000bb1414ac R11: 0000000000000246 R12: 0000000000000013 [ 37.625152] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000