[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.182' (ECDSA) to the list of known hosts. syzkaller login: [ 34.078949] audit: type=1400 audit(1599351736.902:8): avc: denied { execmem } for pid=6369 comm="syz-executor266" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 34.100501] IPVS: ftp: loaded support on port[0] = 21 [ 34.185485] chnl_net:caif_netlink_parms(): no params data found [ 34.248204] bridge0: port 1(bridge_slave_0) entered blocking state [ 34.254787] bridge0: port 1(bridge_slave_0) entered disabled state [ 34.261638] device bridge_slave_0 entered promiscuous mode [ 34.269498] bridge0: port 2(bridge_slave_1) entered blocking state [ 34.276127] bridge0: port 2(bridge_slave_1) entered disabled state [ 34.283525] device bridge_slave_1 entered promiscuous mode [ 34.299707] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 34.309028] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 34.327043] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 34.334245] team0: Port device team_slave_0 added [ 34.339625] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 34.347032] team0: Port device team_slave_1 added [ 34.363474] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 34.369739] 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. [ 34.394950] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 34.406046] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 34.412263] 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. [ 34.437495] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 34.448017] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 34.455663] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 34.475049] device hsr_slave_0 entered promiscuous mode [ 34.480614] device hsr_slave_1 entered promiscuous mode [ 34.486827] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 34.493919] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 34.557127] bridge0: port 2(bridge_slave_1) entered blocking state [ 34.563603] bridge0: port 2(bridge_slave_1) entered forwarding state [ 34.570290] bridge0: port 1(bridge_slave_0) entered blocking state [ 34.576673] bridge0: port 1(bridge_slave_0) entered forwarding state [ 34.607032] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 34.614612] 8021q: adding VLAN 0 to HW filter on device bond0 [ 34.622152] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.631183] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.639567] bridge0: port 1(bridge_slave_0) entered disabled state [ 34.656987] bridge0: port 2(bridge_slave_1) entered disabled state [ 34.666989] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 34.673537] 8021q: adding VLAN 0 to HW filter on device team0 [ 34.681445] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 34.689367] bridge0: port 1(bridge_slave_0) entered blocking state [ 34.695762] bridge0: port 1(bridge_slave_0) entered forwarding state [ 34.713333] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 34.720918] bridge0: port 2(bridge_slave_1) entered blocking state [ 34.727293] bridge0: port 2(bridge_slave_1) entered forwarding state [ 34.734689] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 34.742163] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 34.750243] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 34.759726] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 34.770350] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 34.781015] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 34.788775] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 34.795990] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 34.808985] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 34.817693] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 34.824620] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 34.834868] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 34.886771] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 34.896781] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 34.926722] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 34.934936] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 34.941307] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 34.951255] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 34.958924] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 34.965919] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 34.974420] device veth0_vlan entered promiscuous mode [ 34.982623] device veth1_vlan entered promiscuous mode [ 34.988454] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 34.995530] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 35.004775] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 35.016455] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 35.025340] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 35.033982] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 35.043050] device veth0_macvtap entered promiscuous mode [ 35.049251] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 35.057878] device veth1_macvtap entered promiscuous mode [ 35.066293] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 35.075394] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 35.085134] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 35.091710] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 35.100475] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 35.110103] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 35.117585] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 35.172349] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 35.207375] BUG: spinlock recursion on CPU#1, syz-executor266/6370 [ 35.213717] lock: 0xffff88808b3c8d28, .magic: dead4ead, .owner: syz-executor266/6370, .owner_cpu: 1 [ 35.222998] CPU: 1 PID: 6370 Comm: syz-executor266 Not tainted 4.14.196-syzkaller #0 [ 35.230891] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.240220] Call Trace: [ 35.242815] dump_stack+0x1b2/0x283 [ 35.246433] do_raw_spin_lock+0x1a2/0x200 [ 35.250560] dev_mc_sync+0x10b/0x1c0 [ 35.254269] ? vlan_dev_set_mac_address+0x5c0/0x5c0 [ 35.259257] vlan_dev_set_rx_mode+0x38/0x80 [ 35.263553] __dev_set_rx_mode+0x191/0x2a0 [ 35.267769] dev_uc_unsync+0x16c/0x1c0 [ 35.271648] bond_enslave+0x2014/0x4b00 [ 35.275605] ? bond_update_slave_arr+0x670/0x670 [ 35.280335] ? nlmsg_notify+0x126/0x170 [ 35.284299] ? rtmsg_ifinfo+0xd4/0x100 [ 35.288159] ? __dev_notify_flags+0x12b/0x260 [ 35.292643] ? dev_change_name+0x6a0/0x6a0 [ 35.296867] ? bond_update_slave_arr+0x670/0x670 [ 35.301622] do_set_master+0x19e/0x200 [ 35.305507] rtnl_newlink+0x134c/0x1830 [ 35.309460] ? __lock_acquire+0x5fc/0x3f20 [ 35.313685] ? kmem_cache_free+0x7c/0x2b0 [ 35.317807] ? rtnl_dellink+0x6a0/0x6a0 [ 35.321772] ? trace_hardirqs_on+0x10/0x10 [ 35.326024] ? lock_acquire+0x170/0x3f0 [ 35.329984] ? lock_acquire+0x170/0x3f0 [ 35.334006] ? lock_downgrade+0x740/0x740 [ 35.338134] ? rtnl_dellink+0x6a0/0x6a0 [ 35.342090] rtnetlink_rcv_msg+0x3be/0xb10 [ 35.346327] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 35.350797] ? __netlink_lookup+0x345/0x5d0 [ 35.355095] ? netdev_pick_tx+0x2e0/0x2e0 [ 35.359233] netlink_rcv_skb+0x125/0x390 [ 35.363290] ? memcpy+0x35/0x50 [ 35.366543] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 35.371032] ? netlink_ack+0x9a0/0x9a0 [ 35.374925] netlink_unicast+0x437/0x610 [ 35.378959] ? netlink_sendskb+0xd0/0xd0 [ 35.383001] netlink_sendmsg+0x62e/0xb80 [ 35.387038] ? nlmsg_notify+0x170/0x170 [ 35.390997] ? kernel_recvmsg+0x210/0x210 [ 35.395144] ? security_socket_sendmsg+0x83/0xb0 [ 35.399872] ? nlmsg_notify+0x170/0x170 [ 35.403835] sock_sendmsg+0xb5/0x100 [ 35.407524] ___sys_sendmsg+0x6c8/0x800 [ 35.411486] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 35.416215] ? trace_hardirqs_on+0x10/0x10 [ 35.420424] ? trace_hardirqs_on+0x10/0x10 [ 35.424684] ? trace_hardirqs_on+0x10/0x10 [ 35.428904] ? trace_hardirqs_on+0x10/0x10 [ 35.433135] ? fs_reclaim_release+0xd0/0x110 [ 35.437517] ? __might_fault+0x104/0x1b0 [ 35.441657] ? lock_acquire+0x170/0x3f0 [ 35.445611] ? lock_downgrade+0x740/0x740 [ 35.449733] ? __might_fault+0x177/0x1b0 [ 35.453770] ? _copy_to_user+0x82/0xd0 [ 35.457646] ? move_addr_to_user+0x13f/0x180 [ 35.462046] ? __fdget+0x167/0x1f0 [ 35.465569] ? sockfd_lookup_light+0xb2/0x160 [ 35.470035] __sys_sendmsg+0xa3/0x120 [ 35.473811] ? SyS_shutdown+0x160/0x160 [ 35.477761] ? move_addr_to_kernel+0x60/0x60 [ 35.482149] SyS_sendmsg+0x27/0x40 [ 35.485669] ? __sys_sendmsg+0x120/0x120 [ 35.489705] do_syscall_64+0x1d5/0x640 [ 35.493671] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 35.498833] RIP: 0033:0x443e69 [ 35.502003] RSP: 002b:00007ffe3625cdc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 35.509694] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443e69 [ 35.516937] RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000010 [ 35.524181] RBP: 00007ffe3625cde0 R08: 00000000bb1414ac R09: 00000000bb1414ac [ 35.531436] R10: 00000000bb1414ac R11: 0000000000000246 R12: 00007ffe3625ce10 [ 35.538694] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000