Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.121' (ECDSA) to the list of known hosts. syzkaller login: [ 30.931472] IPVS: ftp: loaded support on port[0] = 21 [ 31.002413] chnl_net:caif_netlink_parms(): no params data found [ 31.102811] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.110013] bridge0: port 1(bridge_slave_0) entered disabled state [ 31.117587] device bridge_slave_0 entered promiscuous mode [ 31.125420] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.132242] bridge0: port 2(bridge_slave_1) entered disabled state [ 31.140038] device bridge_slave_1 entered promiscuous mode [ 31.157135] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 31.166331] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 31.184617] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 31.191967] team0: Port device team_slave_0 added [ 31.197652] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 31.205135] team0: Port device team_slave_1 added [ 31.220352] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 31.226613] 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. [ 31.252576] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 31.264112] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 31.270469] 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. [ 31.296180] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 31.312617] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 31.320361] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 31.339293] device hsr_slave_0 entered promiscuous mode [ 31.344937] device hsr_slave_1 entered promiscuous mode [ 31.351781] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 31.359419] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 31.423868] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.430656] bridge0: port 2(bridge_slave_1) entered forwarding state [ 31.437598] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.444037] bridge0: port 1(bridge_slave_0) entered forwarding state [ 31.474550] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 31.481681] 8021q: adding VLAN 0 to HW filter on device bond0 [ 31.492313] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 31.501275] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.511211] bridge0: port 1(bridge_slave_0) entered disabled state [ 31.519187] bridge0: port 2(bridge_slave_1) entered disabled state [ 31.529411] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 31.535659] 8021q: adding VLAN 0 to HW filter on device team0 [ 31.549014] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 31.557069] bridge0: port 1(bridge_slave_0) entered blocking state [ 31.563838] bridge0: port 1(bridge_slave_0) entered forwarding state [ 31.571487] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 31.580431] bridge0: port 2(bridge_slave_1) entered blocking state [ 31.587068] bridge0: port 2(bridge_slave_1) entered forwarding state [ 31.600777] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 31.609338] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 31.625292] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 31.637644] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 31.649810] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 31.656254] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 31.664746] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 31.672639] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 31.681005] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 31.693875] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 31.702304] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 31.709989] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 31.720777] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 31.773896] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 31.783734] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 31.817261] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 31.824840] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 31.832309] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 31.841487] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 31.850251] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 31.857107] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 31.866134] device veth0_vlan entered promiscuous mode [ 31.875657] device veth1_vlan entered promiscuous mode [ 31.881754] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 31.891103] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 31.902070] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 31.911764] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 31.920305] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 31.928390] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 31.937898] device veth0_macvtap entered promiscuous mode [ 31.944023] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 31.955094] device veth1_macvtap entered promiscuous mode [ 31.964140] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 31.974178] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 31.984118] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 31.991411] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 31.998898] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 32.007000] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 32.017414] IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready [ 32.024484] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 32.031426] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 32.039284] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 32.130186] BUG: spinlock recursion on CPU#1, syz-executor327/7964 [ 32.136727] lock: 0xffff8880a6fedb78, .magic: dead4ead, .owner: syz-executor327/7964, .owner_cpu: 1 [ 32.146184] CPU: 1 PID: 7964 Comm: syz-executor327 Not tainted 4.14.303-syzkaller #0 [ 32.154062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 [ 32.163410] Call Trace: [ 32.166024] dump_stack+0x1b2/0x281 [ 32.169649] do_raw_spin_lock+0x1a2/0x200 [ 32.173779] dev_mc_sync+0x10b/0x1c0 [ 32.177475] ? vlan_dev_set_mac_address+0x5c0/0x5c0 [ 32.182810] vlan_dev_set_rx_mode+0x38/0x80 [ 32.187292] __dev_set_rx_mode+0x191/0x2a0 [ 32.191516] dev_uc_unsync+0x16c/0x1c0 [ 32.195567] bond_enslave+0x1d35/0x4cf0 [ 32.199687] ? bond_update_slave_arr+0x6a0/0x6a0 [ 32.204435] ? nlmsg_notify+0x12b/0x1b0 [ 32.208516] ? nlmsg_notify+0xd5/0x1b0 [ 32.212562] ? rtmsg_ifinfo+0xd4/0x100 [ 32.216452] ? __dev_notify_flags+0x12b/0x260 [ 32.221035] ? dev_change_name+0x6a0/0x6a0 [ 32.225428] ? dev_set_allmulti+0x30/0x30 [ 32.229558] ? bond_update_slave_arr+0x6a0/0x6a0 [ 32.234291] do_set_master+0x19e/0x200 [ 32.238154] rtnl_newlink+0x1356/0x1830 [ 32.242192] ? __lock_acquire+0x5fc/0x3f20 [ 32.246414] ? kasan_slab_free+0xc3/0x1a0 [ 32.250537] ? rtnl_dellink+0x6a0/0x6a0 [ 32.254534] ? trace_hardirqs_on+0x10/0x10 [ 32.258761] ? __dev_queue_xmit+0x1d7f/0x2480 [ 32.263262] ? netlink_deliver_tap+0x61b/0x860 [ 32.267831] ? netlink_unicast+0x485/0x610 [ 32.272066] ? sock_sendmsg+0xb5/0x100 [ 32.276108] ? ___sys_sendmsg+0x6c8/0x800 [ 32.280235] ? __sys_sendmsg+0xa3/0x120 [ 32.284271] ? lock_acquire+0x170/0x3f0 [ 32.288336] ? lock_downgrade+0x740/0x740 [ 32.293341] ? rtnl_dellink+0x6a0/0x6a0 [ 32.297746] rtnetlink_rcv_msg+0x3be/0xb10 [ 32.301972] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 32.306457] ? __netlink_lookup+0x345/0x5d0 [ 32.311026] ? netdev_pick_tx+0x2e0/0x2e0 [ 32.315325] netlink_rcv_skb+0x125/0x390 [ 32.319369] ? rtnl_calcit.isra.0+0x3a0/0x3a0 [ 32.323848] ? netlink_ack+0x9a0/0x9a0 [ 32.327723] netlink_unicast+0x437/0x610 [ 32.332114] ? netlink_sendskb+0xd0/0xd0 [ 32.336181] ? __check_object_size+0x179/0x230 [ 32.340836] netlink_sendmsg+0x648/0xbc0 [ 32.348284] ? nlmsg_notify+0x1b0/0x1b0 [ 32.352238] ? kernel_recvmsg+0x210/0x210 [ 32.356379] ? security_socket_sendmsg+0x83/0xb0 [ 32.361221] ? nlmsg_notify+0x1b0/0x1b0 [ 32.365305] sock_sendmsg+0xb5/0x100 [ 32.369060] ___sys_sendmsg+0x6c8/0x800 [ 32.373027] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 32.377763] ? trace_hardirqs_on+0x10/0x10 [ 32.382081] ? trace_hardirqs_on+0x10/0x10 [ 32.386292] ? trace_hardirqs_on+0x10/0x10 [ 32.390658] ? __might_fault+0x104/0x1b0 [ 32.394711] ? lock_acquire+0x170/0x3f0 [ 32.399112] ? lock_downgrade+0x740/0x740 [ 32.403495] ? __might_fault+0x177/0x1b0 [ 32.407758] ? _copy_to_user+0x82/0xd0 [ 32.412365] ? move_addr_to_user+0x13f/0x180 [ 32.417074] ? __fdget+0x167/0x1f0 [ 32.421296] ? sockfd_lookup_light+0xb2/0x160 [ 32.425987] __sys_sendmsg+0xa3/0x120 [ 32.429877] ? SyS_shutdown+0x160/0x160 [ 32.434161] ? move_addr_to_kernel+0x60/0x60 [ 32.439022] SyS_sendmsg+0x27/0x40 [ 32.442554] ? __sys_sendmsg+0x120/0x120 [ 32.446863] do_syscall_64+0x1d5/0x640 [ 32.450781] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 32.455970] RIP: 0033:0x7fbbccf08709 [ 32.460023] RSP: 002b:00007ffc2d380d18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 32.467709] RAX: ffffffffffffffda RBX: 00007ffc2d380d28 RCX: 00007fbbccf08709 [ 32.475683] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004 [ 32.483015] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 32.490273] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2d380d30 [ 32.497531] R13: 00007ffc2d380d50 R14: 0000000000000000 R15: 0000000000000000