[ 74.339309][ T27] audit: type=1800 audit(1580532805.786:25): pid=9810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 75.420879][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 75.420890][ T27] audit: type=1800 audit(1580532806.866:29): pid=9810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 75.448218][ T27] audit: type=1800 audit(1580532806.866:30): pid=9810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.247' (ECDSA) to the list of known hosts. syzkaller login: [ 86.966758][ T9964] IPVS: ftp: loaded support on port[0] = 21 [ 87.019474][ T9964] chnl_net:caif_netlink_parms(): no params data found [ 87.057065][ T9964] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.064956][ T9964] bridge0: port 1(bridge_slave_0) entered disabled state [ 87.073848][ T9964] device bridge_slave_0 entered promiscuous mode [ 87.082406][ T9964] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.089796][ T9964] bridge0: port 2(bridge_slave_1) entered disabled state [ 87.097736][ T9964] device bridge_slave_1 entered promiscuous mode [ 87.116022][ T9964] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 87.127234][ T9964] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 87.149719][ T9964] team0: Port device team_slave_0 added [ 87.156999][ T9964] team0: Port device team_slave_1 added [ 87.172385][ T9964] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 87.179877][ T9964] 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. [ 87.206363][ T9964] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 87.219623][ T9964] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 87.226593][ T9964] 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. [ 87.253242][ T9964] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 87.320745][ T9964] device hsr_slave_0 entered promiscuous mode [ 87.358566][ T9964] device hsr_slave_1 entered promiscuous mode [ 87.496348][ T9964] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 87.551569][ T9964] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 87.610987][ T9964] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 87.651033][ T9964] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 87.702070][ T9964] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.709369][ T9964] bridge0: port 2(bridge_slave_1) entered forwarding state [ 87.717492][ T9964] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.724656][ T9964] bridge0: port 1(bridge_slave_0) entered forwarding state [ 87.771587][ T9964] 8021q: adding VLAN 0 to HW filter on device bond0 [ 87.785261][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 87.796715][ T3392] bridge0: port 1(bridge_slave_0) entered disabled state [ 87.805341][ T3392] bridge0: port 2(bridge_slave_1) entered disabled state [ 87.814259][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 87.828252][ T9964] 8021q: adding VLAN 0 to HW filter on device team0 [ 87.840853][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 87.850386][ T2779] bridge0: port 1(bridge_slave_0) entered blocking state [ 87.857536][ T2779] bridge0: port 1(bridge_slave_0) entered forwarding state [ 87.878701][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 87.887146][ T2779] bridge0: port 2(bridge_slave_1) entered blocking state [ 87.894293][ T2779] bridge0: port 2(bridge_slave_1) entered forwarding state [ 87.903776][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 87.913732][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 87.933554][ T9964] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 87.944663][ T9964] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 87.957490][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 87.967170][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 87.976464][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 87.986333][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 88.006281][ T2681] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 88.014711][ T2681] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 88.027737][ T9964] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 88.046463][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 88.056083][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 88.077930][ T9964] device veth0_vlan entered promiscuous mode [ 88.085940][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 88.095029][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 88.104358][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 88.113477][ T2779] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 88.131794][ T9964] device veth1_vlan entered promiscuous mode [ 88.153171][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 88.161731][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 88.170167][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 88.179267][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 88.190637][ T9964] device veth0_macvtap entered promiscuous mode [ 88.200816][ T9964] device veth1_macvtap entered promiscuous mode [ 88.220947][ T9964] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 88.229081][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 88.237248][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 88.245666][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 88.255150][ T3392] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 88.270588][ T9964] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 88.278446][ T2681] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 88.287291][ T2681] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 88.448960][ T9964] [ 88.451625][ T9964] ====================================================== [ 88.458792][ T9964] WARNING: possible circular locking dependency detected [ 88.465958][ T9964] 5.5.0-syzkaller #0 Not tainted [ 88.471035][ T9964] ------------------------------------------------------ [ 88.478180][ T9964] syz-executor985/9964 is trying to acquire lock: [ 88.484590][ T9964] ffff888090056128 ((wq_completion)wg-kex-wireguard0){+.+.}, at: flush_workqueue+0xf7/0x14c0 [ 88.494744][ T9964] [ 88.494744][ T9964] but task is already holding lock: [ 88.502114][ T9964] ffff8880918c4e80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 88.511785][ T9964] [ 88.511785][ T9964] which lock already depends on the new lock. [ 88.511785][ T9964] [ 88.522273][ T9964] [ 88.522273][ T9964] the existing dependency chain (in reverse order) is: [ 88.531324][ T9964] [ 88.531324][ T9964] -> #2 (&wg->static_identity.lock){++++}: [ 88.539338][ T9964] down_read+0x95/0x430 [ 88.544016][ T9964] wg_noise_handshake_create_initiation+0xc0/0x670 [ 88.551270][ T9964] wg_packet_send_handshake_initiation+0x185/0x250 [ 88.558333][ T9964] wg_packet_handshake_send_worker+0x1d/0x30 [ 88.564945][ T9964] process_one_work+0xa05/0x17a0 [ 88.570389][ T9964] worker_thread+0x98/0xe40 [ 88.575586][ T9964] kthread+0x361/0x430 [ 88.580312][ T9964] ret_from_fork+0x24/0x30 [ 88.585222][ T9964] [ 88.585222][ T9964] -> #1 ((work_completion)(&peer->transmit_handshake_work)){+.+.}: [ 88.595386][ T9964] process_one_work+0x972/0x17a0 [ 88.600841][ T9964] worker_thread+0x98/0xe40 [ 88.605962][ T9964] kthread+0x361/0x430 [ 88.610664][ T9964] ret_from_fork+0x24/0x30 [ 88.615579][ T9964] [ 88.615579][ T9964] -> #0 ((wq_completion)wg-kex-wireguard0){+.+.}: [ 88.624161][ T9964] __lock_acquire+0x2596/0x4a00 [ 88.629582][ T9964] lock_acquire+0x190/0x410 [ 88.634687][ T9964] flush_workqueue+0x126/0x14c0 [ 88.640053][ T9964] peer_remove_after_dead+0x16b/0x230 [ 88.646048][ T9964] wg_peer_remove+0x244/0x340 [ 88.651347][ T9964] wg_set_device+0xf76/0x1350 [ 88.656653][ T9964] genl_rcv_msg+0x67d/0xea0 [ 88.661670][ T9964] netlink_rcv_skb+0x177/0x450 [ 88.666948][ T9964] genl_rcv+0x29/0x40 [ 88.671548][ T9964] netlink_unicast+0x59e/0x7e0 [ 88.676826][ T9964] netlink_sendmsg+0x91c/0xea0 [ 88.682105][ T9964] sock_sendmsg+0xd7/0x130 [ 88.687125][ T9964] ____sys_sendmsg+0x753/0x880 [ 88.692531][ T9964] ___sys_sendmsg+0x100/0x170 [ 88.697724][ T9964] __sys_sendmsg+0x105/0x1d0 [ 88.702824][ T9964] __x64_sys_sendmsg+0x78/0xb0 [ 88.708189][ T9964] do_syscall_64+0xfa/0x790 [ 88.713211][ T9964] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 88.719865][ T9964] [ 88.719865][ T9964] other info that might help us debug this: [ 88.719865][ T9964] [ 88.731478][ T9964] Chain exists of: [ 88.731478][ T9964] (wq_completion)wg-kex-wireguard0 --> (work_completion)(&peer->transmit_handshake_work) --> &wg->static_identity.lock [ 88.731478][ T9964] [ 88.749938][ T9964] Possible unsafe locking scenario: [ 88.749938][ T9964] [ 88.757390][ T9964] CPU0 CPU1 [ 88.762740][ T9964] ---- ---- [ 88.768099][ T9964] lock(&wg->static_identity.lock); [ 88.773493][ T9964] lock((work_completion)(&peer->transmit_handshake_work)); [ 88.783370][ T9964] lock(&wg->static_identity.lock); [ 88.791232][ T9964] lock((wq_completion)wg-kex-wireguard0); [ 88.797112][ T9964] [ 88.797112][ T9964] *** DEADLOCK *** [ 88.797112][ T9964] [ 88.806006][ T9964] 5 locks held by syz-executor985/9964: [ 88.811633][ T9964] #0: ffffffff8a7899e8 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 [ 88.819559][ T9964] #1: ffffffff8a789aa0 (genl_mutex){+.+.}, at: genl_rcv_msg+0x7de/0xea0 [ 88.827974][ T9964] #2: ffffffff8a733c80 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 [ 88.836110][ T9964] #3: ffff8880918c50a0 (&wg->device_update_lock){+.+.}, at: wg_set_device+0x2be/0x1350 [ 88.845952][ T9964] #4: ffff8880918c4e80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 88.855943][ T9964] [ 88.855943][ T9964] stack backtrace: [ 88.861827][ T9964] CPU: 0 PID: 9964 Comm: syz-executor985 Not tainted 5.5.0-syzkaller #0 [ 88.870257][ T9964] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.880297][ T9964] Call Trace: [ 88.883732][ T9964] dump_stack+0x197/0x210 [ 88.888178][ T9964] print_circular_bug.isra.0.cold+0x163/0x172 [ 88.894253][ T9964] check_noncircular+0x32e/0x3e0 [ 88.899191][ T9964] ? print_circular_bug.isra.0+0x230/0x230 [ 88.904996][ T9964] ? profile_setup.cold+0xbb/0xbb [ 88.910024][ T9964] ? alloc_list_entry+0xc0/0xc0 [ 88.915101][ T9964] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 88.921337][ T9964] ? find_first_zero_bit+0x9a/0xc0 [ 88.926536][ T9964] __lock_acquire+0x2596/0x4a00 [ 88.931381][ T9964] ? check_noncircular+0x16d/0x3e0 [ 88.936487][ T9964] ? mark_held_locks+0xf0/0xf0 [ 88.941968][ T9964] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 88.948311][ T9964] ? find_first_zero_bit+0x9a/0xc0 [ 88.953488][ T9964] lock_acquire+0x190/0x410 [ 88.957990][ T9964] ? flush_workqueue+0xf7/0x14c0 [ 88.962926][ T9964] flush_workqueue+0x126/0x14c0 [ 88.967769][ T9964] ? flush_workqueue+0xf7/0x14c0 [ 88.972823][ T9964] ? napi_hash_del+0x125/0x170 [ 88.977587][ T9964] ? lock_downgrade+0x920/0x920 [ 88.982559][ T9964] ? pwq_unbound_release_workfn+0x2f0/0x2f0 [ 88.988582][ T9964] ? _raw_spin_unlock+0x28/0x40 [ 88.993480][ T9964] ? kfree_skb+0x10e/0x420 [ 88.997882][ T9964] peer_remove_after_dead+0x16b/0x230 [ 89.003413][ T9964] ? peer_remove_after_dead+0x16b/0x230 [ 89.008953][ T9964] wg_peer_remove+0x244/0x340 [ 89.013651][ T9964] wg_set_device+0xf76/0x1350 [ 89.018322][ T9964] ? set_peer+0x1150/0x1150 [ 89.022908][ T9964] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.029140][ T9964] ? __nla_parse+0x43/0x60 [ 89.033558][ T9964] ? genl_family_rcv_msg_attrs_parse+0x1c6/0x300 [ 89.039883][ T9964] genl_rcv_msg+0x67d/0xea0 [ 89.044434][ T9964] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 89.050907][ T9964] ? __kasan_check_read+0x11/0x20 [ 89.056105][ T9964] ? find_held_lock+0x35/0x130 [ 89.061362][ T9964] netlink_rcv_skb+0x177/0x450 [ 89.066148][ T9964] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 89.072532][ T9964] ? netlink_ack+0xb50/0xb50 [ 89.077381][ T9964] ? __kasan_check_write+0x14/0x20 [ 89.082487][ T9964] ? netlink_deliver_tap+0x248/0xbf0 [ 89.087860][ T9964] genl_rcv+0x29/0x40 [ 89.091886][ T9964] netlink_unicast+0x59e/0x7e0 [ 89.096991][ T9964] ? netlink_attachskb+0x870/0x870 [ 89.102221][ T9964] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 89.108111][ T9964] ? __check_object_size+0x3d/0x437 [ 89.113542][ T9964] netlink_sendmsg+0x91c/0xea0 [ 89.118436][ T9964] ? netlink_unicast+0x7e0/0x7e0 [ 89.123399][ T9964] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 89.129107][ T9964] ? apparmor_socket_sendmsg+0x2a/0x30 [ 89.134563][ T9964] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.140938][ T9964] ? security_socket_sendmsg+0x8d/0xc0 [ 89.146390][ T9964] ? netlink_unicast+0x7e0/0x7e0 [ 89.151327][ T9964] sock_sendmsg+0xd7/0x130 [ 89.155737][ T9964] ____sys_sendmsg+0x753/0x880 [ 89.160505][ T9964] ? kernel_sendmsg+0x50/0x50 [ 89.165294][ T9964] ? debug_object_active_state+0x28a/0x350 [ 89.171224][ T9964] ? find_held_lock+0x35/0x130 [ 89.175975][ T9964] ___sys_sendmsg+0x100/0x170 [ 89.180723][ T9964] ? sendmsg_copy_msghdr+0x70/0x70 [ 89.185849][ T9964] ? lockdep_hardirqs_on+0x421/0x5e0 [ 89.191227][ T9964] ? __kasan_check_read+0x11/0x20 [ 89.196279][ T9964] ? mark_lock+0xc2/0x1220 [ 89.200683][ T9964] ? __kasan_check_read+0x11/0x20 [ 89.205928][ T9964] ? __lock_acquire+0x16f2/0x4a00 [ 89.211053][ T9964] ? debug_object_deactivate+0x320/0x320 [ 89.216795][ T9964] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 89.222954][ T9964] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.229266][ T9964] ? __fget_light+0x1ad/0x270 [ 89.234001][ T9964] ? __fdget+0x1b/0x20 [ 89.238085][ T9964] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 89.244550][ T9964] __sys_sendmsg+0x105/0x1d0 [ 89.249136][ T9964] ? __sys_sendmsg_sock+0xc0/0xc0 [ 89.254169][ T9964] ? lockdep_hardirqs_on+0x421/0x5e0 [ 89.259539][ T9964] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 89.265110][ T9964] ? do_syscall_64+0x26/0x790 [ 89.269861][ T9964] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.276127][ T9964] ? do_syscall_64+0x26/0x790 [ 89.280929][ T9964] __x64_sys_sendmsg+0x78/0xb0 [ 89.285686][ T9964] do_syscall_64+0xfa/0x790 [ 89.290341][ T9964] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.296390][ T9964] RIP: 0033:0x4491c9 [ 89.300424][ T9964] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 9b d4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 89.320804][ T9964] RSP: 002b:00007ffe319ea728 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 89.329223][ T9964] RAX: ffffffffffffffda RBX: 0000000000003064 RCX: 00000000004491c9 [ 89.337299][ T9964] RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000004 [ 89.345262][ T9964] RBP: 7261756765726977 R08: 0000000000000000 R09: 0000000001bbbbbb [ 89.353589][ T9964] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 89.361671][ T9964] R13: 0000000000406b80 R14: 0000000000000000 R15: 0000000000000000