[ 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 '10.128.0.2' (ECDSA) to the list of known hosts. syzkaller login: [ 44.351325] IPVS: ftp: loaded support on port[0] = 21 [ 44.420215] chnl_net:caif_netlink_parms(): no params data found [ 44.520398] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.528936] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.537288] device bridge_slave_0 entered promiscuous mode [ 44.544943] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.551319] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.558989] device bridge_slave_1 entered promiscuous mode [ 44.575930] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 44.584796] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 44.602845] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 44.610133] team0: Port device team_slave_0 added [ 44.615975] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 44.623466] team0: Port device team_slave_1 added [ 44.638652] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 44.644952] 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. [ 44.670287] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 44.681765] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 44.688100] 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. [ 44.713343] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 44.724201] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 44.731523] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 44.750268] device hsr_slave_0 entered promiscuous mode [ 44.756000] device hsr_slave_1 entered promiscuous mode [ 44.762013] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 44.768951] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 44.831772] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.838224] bridge0: port 2(bridge_slave_1) entered forwarding state [ 44.845011] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.851354] bridge0: port 1(bridge_slave_0) entered forwarding state [ 44.881686] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 44.888503] 8021q: adding VLAN 0 to HW filter on device bond0 [ 44.897606] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.906419] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 44.915266] bridge0: port 1(bridge_slave_0) entered disabled state [ 44.922347] bridge0: port 2(bridge_slave_1) entered disabled state [ 44.929249] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 44.940288] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 44.946886] 8021q: adding VLAN 0 to HW filter on device team0 [ 44.956269] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 44.964076] bridge0: port 1(bridge_slave_0) entered blocking state [ 44.970436] bridge0: port 1(bridge_slave_0) entered forwarding state [ 44.980292] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 44.987958] bridge0: port 2(bridge_slave_1) entered blocking state [ 44.994334] bridge0: port 2(bridge_slave_1) entered forwarding state [ 45.013209] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 45.020972] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 45.029069] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 45.038486] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 45.045761] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 45.055277] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 45.061272] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 45.075008] IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready [ 45.082620] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 45.089280] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 45.100258] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 45.112746] IPv6: ADDRCONF(NETDEV_UP): veth0_virt_wifi: link is not ready [ 45.122583] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 45.150597] IPv6: ADDRCONF(NETDEV_UP): veth0_vlan: link is not ready [ 45.158450] IPv6: ADDRCONF(NETDEV_UP): vlan0: link is not ready [ 45.165654] IPv6: ADDRCONF(NETDEV_UP): vlan1: link is not ready [ 45.175228] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 45.183037] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 45.189815] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 45.199620] device veth0_vlan entered promiscuous mode [ 45.208248] device veth1_vlan entered promiscuous mode [ 45.214450] IPv6: ADDRCONF(NETDEV_UP): macvlan0: link is not ready [ 45.222966] IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready [ 45.234238] IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready [ 45.243406] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 45.250594] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 45.258492] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 45.267714] device veth0_macvtap entered promiscuous mode [ 45.274413] IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready [ 45.282421] device veth1_macvtap entered promiscuous mode [ 45.291141] IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready [ 45.300987] IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready [ 45.310767] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 45.317828] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 45.325884] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 45.336254] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 45.343314] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 45.434258] [ 45.435890] ============================================ [ 45.441312] WARNING: possible recursive locking detected [ 45.446738] 4.19.211-syzkaller #0 Not tainted [ 45.451209] -------------------------------------------- [ 45.456645] syz-executor354/8114 is trying to acquire lock: [ 45.462328] 00000000e32069ce (rtnl_mutex){+.+.}, at: hsr_dev_destroy+0x1b/0xb0 [ 45.469774] [ 45.469774] but task is already holding lock: [ 45.475719] 00000000e32069ce (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 [ 45.483431] [ 45.483431] other info that might help us debug this: [ 45.490075] Possible unsafe locking scenario: [ 45.490075] [ 45.496105] CPU0 [ 45.498659] ---- [ 45.501228] lock(rtnl_mutex); [ 45.504481] lock(rtnl_mutex); [ 45.507731] [ 45.507731] *** DEADLOCK *** [ 45.507731] [ 45.513764] May be due to missing lock nesting notation [ 45.513764] [ 45.520668] 1 lock held by syz-executor354/8114: [ 45.525392] #0: 00000000e32069ce (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 [ 45.533604] [ 45.533604] stack backtrace: [ 45.538114] CPU: 0 PID: 8114 Comm: syz-executor354 Not tainted 4.19.211-syzkaller #0 [ 45.545976] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 45.555304] Call Trace: [ 45.557872] dump_stack+0x1fc/0x2ef [ 45.561481] __lock_acquire.cold+0x121/0x57e [ 45.565868] ? enable_ptr_key_workfn+0x30/0x30 [ 45.570430] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 45.575602] ? mark_held_locks+0xf0/0xf0 [ 45.579655] ? vsscanf+0x1ec/0x25a0 [ 45.583261] ? vsnprintf+0x2cc/0x14f0 [ 45.587041] ? pointer+0x850/0x850 [ 45.590559] ? mark_held_locks+0xa6/0xf0 [ 45.594613] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 45.599693] lock_acquire+0x170/0x3c0 [ 45.603476] ? hsr_dev_destroy+0x1b/0xb0 [ 45.607515] ? hsr_dev_destroy+0x1b/0xb0 [ 45.611553] __mutex_lock+0xd7/0x1190 [ 45.615338] ? hsr_dev_destroy+0x1b/0xb0 [ 45.619394] ? full_name_hash+0xb5/0xf0 [ 45.623355] ? hsr_dev_destroy+0x1b/0xb0 [ 45.627393] ? mutex_trylock+0x1a0/0x1a0 [ 45.631434] ? dev_alloc_name_ns+0x390/0x440 [ 45.635825] ? dev_valid_name+0x220/0x220 [ 45.639972] ? ip6_route_dev_notify+0xd7/0xcd0 [ 45.644536] ? hsr_dev_close+0x10/0x10 [ 45.648405] hsr_dev_destroy+0x1b/0xb0 [ 45.652296] ? hsr_dev_close+0x10/0x10 [ 45.656162] register_netdevice+0x901/0x10f0 [ 45.660552] ? unregister_netdev+0x20/0x20 [ 45.664768] ? hsr_get_max_mtu+0x1d0/0x2a0 [ 45.668983] ? hsr_add_port+0x4e9/0x6a0 [ 45.672936] hsr_dev_finalize+0x4f5/0x770 [ 45.677086] hsr_newlink+0x27d/0x3e0 [ 45.680792] ? hsr_fill_info+0x590/0x590 [ 45.684831] ? rtnl_create_link+0x145/0xa40 [ 45.689131] ? hsr_fill_info+0x590/0x590 [ 45.693166] rtnl_newlink+0x1030/0x15c0 [ 45.697132] ? rtnl_getlink+0x620/0x620 [ 45.701085] ? mark_held_locks+0xf0/0xf0 [ 45.705122] ? unwind_next_frame+0xeee/0x1400 [ 45.709592] ? __save_stack_trace+0x72/0x190 [ 45.713977] ? deref_stack_reg+0x134/0x1d0 [ 45.718187] ? get_reg+0x176/0x1f0 [ 45.721704] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 45.727569] ? deref_stack_reg+0x1d0/0x1d0 [ 45.731781] ? is_bpf_text_address+0xd5/0x1b0 [ 45.736252] ? lock_downgrade+0x720/0x720 [ 45.740392] ? lock_acquire+0x170/0x3c0 [ 45.744344] ? __bpf_address_lookup+0x330/0x330 [ 45.749008] ? check_preemption_disabled+0x41/0x280 [ 45.754000] ? is_bpf_text_address+0xfc/0x1b0 [ 45.758475] ? kernel_text_address+0xbd/0xf0 [ 45.762862] ? __kernel_text_address+0x9/0x30 [ 45.767334] ? unwind_get_return_address+0x51/0x90 [ 45.772248] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.777588] ? __save_stack_trace+0xaf/0x190 [ 45.781974] ? __lock_acquire+0x6de/0x3ff0 [ 45.786201] ? __kasan_slab_free+0x186/0x1f0 [ 45.790586] ? kmem_cache_free+0x7f/0x260 [ 45.794725] ? kfree_skbmem+0xc1/0x140 [ 45.798606] ? consume_skb+0x120/0x3d0 [ 45.802476] ? mark_held_locks+0xf0/0xf0 [ 45.806523] ? netlink_deliver_tap+0x8fb/0xb00 [ 45.811112] ? netlink_unicast+0x545/0x690 [ 45.815347] ? netlink_sendmsg+0x6c3/0xc50 [ 45.819574] ? sock_sendmsg+0xc3/0x120 [ 45.823453] ? ___sys_sendmsg+0x7bb/0x8e0 [ 45.827580] ? __x64_sys_sendmsg+0x132/0x220 [ 45.831970] ? do_syscall_64+0xf9/0x620 [ 45.835925] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.841279] ? mutex_trylock+0x1a0/0x1a0 [ 45.845321] ? check_preemption_disabled+0x41/0x280 [ 45.850344] ? rtnetlink_rcv_msg+0x3c3/0xb80 [ 45.854737] ? rtnl_getlink+0x620/0x620 [ 45.858705] rtnetlink_rcv_msg+0x453/0xb80 [ 45.862919] ? rtnl_calcit.isra.0+0x430/0x430 [ 45.867415] ? memcpy+0x35/0x50 [ 45.870672] ? netdev_pick_tx+0x2f0/0x2f0 [ 45.874799] ? __copy_skb_header+0x414/0x500 [ 45.879302] ? kfree_skbmem+0x140/0x140 [ 45.883253] netlink_rcv_skb+0x160/0x440 [ 45.887309] ? rtnl_calcit.isra.0+0x430/0x430 [ 45.891782] ? netlink_ack+0xae0/0xae0 [ 45.895646] netlink_unicast+0x4d5/0x690 [ 45.899685] ? netlink_sendskb+0x110/0x110 [ 45.903905] ? _copy_from_iter_full+0x229/0x7c0 [ 45.908571] ? __phys_addr_symbol+0x2c/0x70 [ 45.912873] ? __check_object_size+0x17b/0x3e0 [ 45.917452] netlink_sendmsg+0x6c3/0xc50 [ 45.921594] ? aa_af_perm+0x230/0x230 [ 45.925392] ? nlmsg_notify+0x1f0/0x1f0 [ 45.929348] ? kernel_recvmsg+0x220/0x220 [ 45.933475] ? nlmsg_notify+0x1f0/0x1f0 [ 45.937432] sock_sendmsg+0xc3/0x120 [ 45.941142] ___sys_sendmsg+0x7bb/0x8e0 [ 45.945112] ? copy_msghdr_from_user+0x440/0x440 [ 45.949850] ? lock_downgrade+0x720/0x720 [ 45.953979] ? sock_ioctl+0x30e/0x5d0 [ 45.957756] ? __might_fault+0x11f/0x1d0 [ 45.961809] ? dlci_ioctl_set+0x30/0x30 [ 45.965763] ? lock_downgrade+0x720/0x720 [ 45.969890] ? lock_acquire+0x170/0x3c0 [ 45.973864] ? __might_fault+0xef/0x1d0 [ 45.977817] ? dlci_ioctl_set+0x30/0x30 [ 45.981770] ? do_vfs_ioctl+0x110/0x12e0 [ 45.985807] ? _copy_to_user+0xb8/0x100 [ 45.989757] ? ioctl_preallocate+0x200/0x200 [ 45.994144] ? move_addr_to_user+0x190/0x1d0 [ 45.998531] ? __fdget+0x1a0/0x230 [ 46.002053] __x64_sys_sendmsg+0x132/0x220 [ 46.006272] ? __sys_sendmsg+0x1b0/0x1b0 [ 46.010313] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 46.015653] ? trace_hardirqs_off_caller+0x6e/0x210 [ 46.020669] ? do_syscall_64+0x21/0x620 [ 46.024620] do_syscall_64+0xf9/0x620 [ 46.028400] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 46.033582] RIP: 0033:0x7f172241b839 [ 46.037275] Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 46.056164] RSP: 002b:00007ffced11aee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 46.063860] RAX: ffffffffffffffda RBX: 00007ffced11aef8 RCX: 00007f172241b839 [ 46.071120] RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000005 [ 46.078367] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 46.085616] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffced11af00 [ 46.092862] R13: 00007ffced11af20 R14: 0000000000000000 R15: 0000000000000000