[ 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 '10.128.0.100' (ECDSA) to the list of known hosts. syzkaller login: [ 35.817760] audit: type=1400 audit(1596659358.497:8): avc: denied { execmem } for pid=6349 comm="syz-executor856" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 36.065757] IPVS: ftp: loaded support on port[0] = 21 [ 36.906142] chnl_net:caif_netlink_parms(): no params data found [ 37.026974] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.033564] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.041570] device bridge_slave_0 entered promiscuous mode [ 37.048839] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.055695] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.062541] device bridge_slave_1 entered promiscuous mode [ 37.078971] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 37.087632] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 37.104902] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 37.112404] team0: Port device team_slave_0 added [ 37.118145] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 37.125314] team0: Port device team_slave_1 added [ 37.140338] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 37.146644] 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. [ 37.172020] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 37.183356] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 37.189649] 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. [ 37.215032] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 37.225889] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 37.233223] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 37.296364] device hsr_slave_0 entered promiscuous mode [ 37.334253] device hsr_slave_1 entered promiscuous mode [ 37.374560] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 37.381549] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 37.440712] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.447190] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.454269] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.460616] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.489221] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 37.496410] 8021q: adding VLAN 0 to HW filter on device bond0 [ 37.504218] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.512171] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.522016] bridge0: port 1(bridge_slave_0) entered disabled state [ 37.539534] bridge0: port 2(bridge_slave_1) entered disabled state [ 37.549751] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 37.555874] 8021q: adding VLAN 0 to HW filter on device team0 [ 37.563971] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 37.571569] bridge0: port 1(bridge_slave_0) entered blocking state [ 37.577948] bridge0: port 1(bridge_slave_0) entered forwarding state [ 37.586769] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 37.595253] bridge0: port 2(bridge_slave_1) entered blocking state [ 37.601596] bridge0: port 2(bridge_slave_1) entered forwarding state [ 37.621552] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 37.631402] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 37.642193] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 37.649851] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 37.657960] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 37.665664] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 37.673142] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 37.680970] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 37.687789] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 37.698890] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 37.707149] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 37.714221] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 37.725815] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 37.776277] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 37.786299] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 37.816447] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 37.823311] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 37.831526] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 37.840681] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 37.848746] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 37.856031] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 37.865091] device veth0_vlan entered promiscuous mode [ 37.873382] device veth1_vlan entered promiscuous mode [ 37.879677] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 37.888620] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 37.895855] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 37.902764] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 37.910953] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 37.922910] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 37.931732] IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready [ 37.938666] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 37.946689] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 37.956524] device veth0_macvtap entered promiscuous mode [ 37.962535] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 37.971428] device veth1_macvtap entered promiscuous mode [ 37.978129] IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready [ 37.986852] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 37.996708] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 38.007154] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready [ 38.014779] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 38.021458] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 38.029356] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 38.037010] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 38.045126] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 38.056503] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 38.063353] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 38.070645] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 38.079739] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 38.203733] BUG: spinlock recursion on CPU#1, syz-executor856/6350 [ 38.210071] lock: 0xffff888097f0c9e8, .magic: dead4ead, .owner: syz-executor856/6350, .owner_cpu: 1 [ 38.219402] CPU: 1 PID: 6350 Comm: syz-executor856 Not tainted 4.14.192-syzkaller #0 [ 38.227358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.236688] Call Trace: [ 38.239252] dump_stack+0x1b2/0x283 [ 38.242854] do_raw_spin_lock+0x1a2/0x200 [ 38.246975] dev_mc_sync+0x10b/0x1c0 [ 38.250797] ? vlan_dev_set_mac_address+0x5c0/0x5c0 [ 38.255787] vlan_dev_set_rx_mode+0x38/0x80 [ 38.260081] __dev_set_rx_mode+0x191/0x2a0 [ 38.264296] dev_uc_unsync+0x16c/0x1c0 [ 38.268159] bond_enslave+0x2014/0x4b00 [ 38.272109] ? bond_update_slave_arr+0x670/0x670 [ 38.276841] ? nlmsg_notify+0x126/0x170 [ 38.280791] ? rtmsg_ifinfo+0xd4/0x100 [ 38.284653] ? __dev_notify_flags+0x12b/0x260 [ 38.289119] ? dev_change_name+0x6a0/0x6a0 [ 38.293332] ? bond_update_slave_arr+0x670/0x670 [ 38.298068] do_set_master+0x19e/0x200 [ 38.301930] rtnl_newlink+0x134c/0x1830 [ 38.305879] ? __lock_acquire+0x5fc/0x3f20 [ 38.310091] ? kmem_cache_free+0x7c/0x2b0 [ 38.314212] ? rtnl_dellink+0x6a0/0x6a0 [ 38.318157] ? trace_hardirqs_on+0x10/0x10 [ 38.322416] ? lock_acquire+0x170/0x3f0 [ 38.326378] ? lock_acquire+0x170/0x3f0 [ 38.330411] ? lock_downgrade+0x740/0x740 [ 38.334574] ? rtnl_dellink+0x6a0/0x6a0 [ 38.338673] rtnetlink_rcv_msg+0x3be/0xb10 [ 38.342880] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 38.347350] ? __netlink_lookup+0x345/0x5d0 [ 38.351644] ? netdev_pick_tx+0x2e0/0x2e0 [ 38.355764] netlink_rcv_skb+0x125/0x390 [ 38.359799] ? memcpy+0x35/0x50 [ 38.363051] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 38.367527] ? netlink_ack+0x9a0/0x9a0 [ 38.371409] netlink_unicast+0x437/0x610 [ 38.375443] ? netlink_sendskb+0xd0/0xd0 [ 38.379497] netlink_sendmsg+0x62e/0xb80 [ 38.383540] ? nlmsg_notify+0x170/0x170 [ 38.387495] ? kernel_recvmsg+0x210/0x210 [ 38.391617] ? security_socket_sendmsg+0x83/0xb0 [ 38.396347] ? nlmsg_notify+0x170/0x170 [ 38.400294] sock_sendmsg+0xb5/0x100 [ 38.403986] ___sys_sendmsg+0x6c8/0x800 [ 38.407940] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 38.412667] ? trace_hardirqs_on+0x10/0x10 [ 38.416879] ? trace_hardirqs_on+0x10/0x10 [ 38.421087] ? trace_hardirqs_on+0x10/0x10 [ 38.425298] ? trace_hardirqs_on+0x10/0x10 [ 38.429503] ? fs_reclaim_release+0xd0/0x110 [ 38.433882] ? __might_fault+0x104/0x1b0 [ 38.437914] ? lock_acquire+0x170/0x3f0 [ 38.441863] ? lock_downgrade+0x740/0x740 [ 38.445988] ? __might_fault+0x177/0x1b0 [ 38.450022] ? _copy_to_user+0x82/0xd0 [ 38.453886] ? move_addr_to_user+0x13f/0x180 [ 38.458266] ? __fdget+0x167/0x1f0 [ 38.461779] ? sockfd_lookup_light+0xb2/0x160 [ 38.466260] __sys_sendmsg+0xa3/0x120 [ 38.470040] ? SyS_shutdown+0x160/0x160 [ 38.473993] ? move_addr_to_kernel+0x60/0x60 [ 38.478392] SyS_sendmsg+0x27/0x40 [ 38.481908] ? __sys_sendmsg+0x120/0x120 [ 38.485950] do_syscall_64+0x1d5/0x640 [ 38.489816] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 38.494981] RIP: 0033:0x443d29 [ 38.498145] RSP: 002b:00007ffda8054058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 38.505825] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443d29 [ 38.513070] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000010 [ 38.520315] RBP: 00007ffda8054070 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 38.527558] R10: 00000000bb1414ac R11: 0000000000000246 R12: 00007ffda80540a0 [ 38.534800] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 47.130680] NOHZ: local_softirq_pending 08