[ 88.158083][ T27] audit: type=1800 audit(1580536377.986:28): pid=9679 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 88.905436][ T9747] sshd (9747) used greatest stack depth: 22792 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 89.220225][ T27] audit: type=1800 audit(1580536379.186:29): pid=9679 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 [ 89.241744][ T27] audit: type=1800 audit(1580536379.186:30): pid=9679 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 '10.128.0.251' (ECDSA) to the list of known hosts. syzkaller login: [ 96.613451][ T9832] IPVS: ftp: loaded support on port[0] = 21 [ 96.665807][ T9832] chnl_net:caif_netlink_parms(): no params data found [ 96.704095][ T9832] bridge0: port 1(bridge_slave_0) entered blocking state [ 96.711781][ T9832] bridge0: port 1(bridge_slave_0) entered disabled state [ 96.719782][ T9832] device bridge_slave_0 entered promiscuous mode [ 96.728376][ T9832] bridge0: port 2(bridge_slave_1) entered blocking state [ 96.735679][ T9832] bridge0: port 2(bridge_slave_1) entered disabled state [ 96.743529][ T9832] device bridge_slave_1 entered promiscuous mode [ 96.761330][ T9832] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 96.772599][ T9832] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 96.793827][ T9832] team0: Port device team_slave_0 added [ 96.801214][ T9832] team0: Port device team_slave_1 added [ 96.816415][ T9832] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 96.823480][ T9832] 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. [ 96.849482][ T9832] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 96.861740][ T9832] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 96.868853][ T9832] 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. [ 96.894899][ T9832] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 96.964710][ T9832] device hsr_slave_0 entered promiscuous mode [ 97.032405][ T9832] device hsr_slave_1 entered promiscuous mode [ 97.150519][ T9832] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 97.215319][ T9832] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 97.295455][ T9832] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 97.364427][ T9832] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 97.426068][ T9832] bridge0: port 2(bridge_slave_1) entered blocking state [ 97.433323][ T9832] bridge0: port 2(bridge_slave_1) entered forwarding state [ 97.441016][ T9832] bridge0: port 1(bridge_slave_0) entered blocking state [ 97.448179][ T9832] bridge0: port 1(bridge_slave_0) entered forwarding state [ 97.493276][ T9832] 8021q: adding VLAN 0 to HW filter on device bond0 [ 97.507312][ T2845] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 97.517745][ T2845] bridge0: port 1(bridge_slave_0) entered disabled state [ 97.525870][ T2845] bridge0: port 2(bridge_slave_1) entered disabled state [ 97.534728][ T2845] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 97.548175][ T9832] 8021q: adding VLAN 0 to HW filter on device team0 [ 97.559815][ T2884] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 97.568830][ T2884] bridge0: port 1(bridge_slave_0) entered blocking state [ 97.575949][ T2884] bridge0: port 1(bridge_slave_0) entered forwarding state [ 97.587721][ T2845] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 97.596985][ T2845] bridge0: port 2(bridge_slave_1) entered blocking state [ 97.604087][ T2845] bridge0: port 2(bridge_slave_1) entered forwarding state [ 97.623547][ T2884] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 97.632682][ T2884] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 97.649569][ T9832] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 97.660946][ T9832] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 97.675611][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 97.684067][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 97.693403][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 97.704545][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 97.723650][ T2847] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 97.731087][ T2847] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 97.745425][ T9832] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 97.764669][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 97.774500][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 97.793191][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 97.801452][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 97.810890][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 97.819998][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 97.829436][ T9832] device veth0_vlan entered promiscuous mode [ 97.841129][ T9832] device veth1_vlan entered promiscuous mode [ 97.860899][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 97.870246][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 97.879330][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 97.888375][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 97.899917][ T9832] device veth0_macvtap entered promiscuous mode [ 97.911729][ T9832] device veth1_macvtap entered promiscuous mode [ 97.928591][ T9832] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 97.937127][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 97.945401][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 97.953712][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 97.962535][ T2733] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 97.974856][ T9832] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 97.983671][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 97.993464][ T2849] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 98.123179][ T9832] [ 98.125836][ T9832] ====================================================== [ 98.132852][ T9832] WARNING: possible circular locking dependency detected [ 98.139865][ T9832] 5.5.0-syzkaller #0 Not tainted [ 98.144793][ T9832] ------------------------------------------------------ [ 98.151803][ T9832] syz-executor707/9832 is trying to acquire lock: [ 98.158211][ T9832] ffff8880a4615528 ((wq_completion)wg-kex-wireguard0){+.+.}, at: flush_workqueue+0xf7/0x14c0 [ 98.168357][ T9832] [ 98.168357][ T9832] but task is already holding lock: [ 98.175723][ T9832] ffff88809014ce80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 98.185165][ T9832] [ 98.185165][ T9832] which lock already depends on the new lock. [ 98.185165][ T9832] [ 98.195557][ T9832] [ 98.195557][ T9832] the existing dependency chain (in reverse order) is: [ 98.204562][ T9832] [ 98.204562][ T9832] -> #2 (&wg->static_identity.lock){++++}: [ 98.212538][ T9832] down_read+0x95/0x430 [ 98.217227][ T9832] wg_noise_handshake_create_initiation+0xc0/0x670 [ 98.224239][ T9832] wg_packet_send_handshake_initiation+0x185/0x250 [ 98.231396][ T9832] wg_packet_handshake_send_worker+0x1d/0x30 [ 98.237897][ T9832] process_one_work+0xa05/0x17a0 [ 98.243336][ T9832] worker_thread+0x98/0xe40 [ 98.248457][ T9832] kthread+0x361/0x430 [ 98.253033][ T9832] ret_from_fork+0x24/0x30 [ 98.257981][ T9832] [ 98.257981][ T9832] -> #1 ((work_completion)(&peer->transmit_handshake_work)){+.+.}: [ 98.268063][ T9832] process_one_work+0x972/0x17a0 [ 98.273529][ T9832] worker_thread+0x98/0xe40 [ 98.278566][ T9832] kthread+0x361/0x430 [ 98.283142][ T9832] ret_from_fork+0x24/0x30 [ 98.288065][ T9832] [ 98.288065][ T9832] -> #0 ((wq_completion)wg-kex-wireguard0){+.+.}: [ 98.296687][ T9832] __lock_acquire+0x2596/0x4a00 [ 98.302055][ T9832] lock_acquire+0x190/0x410 [ 98.307074][ T9832] flush_workqueue+0x126/0x14c0 [ 98.312484][ T9832] peer_remove_after_dead+0x16b/0x230 [ 98.318367][ T9832] wg_peer_remove+0x244/0x340 [ 98.323557][ T9832] wg_set_device+0xf76/0x1350 [ 98.328771][ T9832] genl_rcv_msg+0x67d/0xea0 [ 98.334340][ T9832] netlink_rcv_skb+0x177/0x450 [ 98.339673][ T9832] genl_rcv+0x29/0x40 [ 98.344223][ T9832] netlink_unicast+0x59e/0x7e0 [ 98.349499][ T9832] netlink_sendmsg+0x91c/0xea0 [ 98.354780][ T9832] sock_sendmsg+0xd7/0x130 [ 98.359700][ T9832] ____sys_sendmsg+0x753/0x880 [ 98.364967][ T9832] ___sys_sendmsg+0x100/0x170 [ 98.370176][ T9832] __sys_sendmsg+0x105/0x1d0 [ 98.375334][ T9832] __x64_sys_sendmsg+0x78/0xb0 [ 98.380634][ T9832] do_syscall_64+0xfa/0x790 [ 98.385700][ T9832] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.392108][ T9832] [ 98.392108][ T9832] other info that might help us debug this: [ 98.392108][ T9832] [ 98.402455][ T9832] Chain exists of: [ 98.402455][ T9832] (wq_completion)wg-kex-wireguard0 --> (work_completion)(&peer->transmit_handshake_work) --> &wg->static_identity.lock [ 98.402455][ T9832] [ 98.420981][ T9832] Possible unsafe locking scenario: [ 98.420981][ T9832] [ 98.428625][ T9832] CPU0 CPU1 [ 98.433981][ T9832] ---- ---- [ 98.439328][ T9832] lock(&wg->static_identity.lock); [ 98.444597][ T9832] lock((work_completion)(&peer->transmit_handshake_work)); [ 98.454466][ T9832] lock(&wg->static_identity.lock); [ 98.462260][ T9832] lock((wq_completion)wg-kex-wireguard0); [ 98.468161][ T9832] [ 98.468161][ T9832] *** DEADLOCK *** [ 98.468161][ T9832] [ 98.476446][ T9832] 5 locks held by syz-executor707/9832: [ 98.482036][ T9832] #0: ffffffff8a7899e8 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 [ 98.489784][ T9832] #1: ffffffff8a789aa0 (genl_mutex){+.+.}, at: genl_rcv_msg+0x7de/0xea0 [ 98.498209][ T9832] #2: ffffffff8a733c80 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 [ 98.506235][ T9832] #3: ffff88809014d0a0 (&wg->device_update_lock){+.+.}, at: wg_set_device+0x2be/0x1350 [ 98.516056][ T9832] #4: ffff88809014ce80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 98.526173][ T9832] [ 98.526173][ T9832] stack backtrace: [ 98.532173][ T9832] CPU: 1 PID: 9832 Comm: syz-executor707 Not tainted 5.5.0-syzkaller #0 [ 98.532180][ T9832] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.532183][ T9832] Call Trace: [ 98.532205][ T9832] dump_stack+0x197/0x210 [ 98.532222][ T9832] print_circular_bug.isra.0.cold+0x163/0x172 [ 98.532236][ T9832] check_noncircular+0x32e/0x3e0 [ 98.532250][ T9832] ? print_circular_bug.isra.0+0x230/0x230 [ 98.532263][ T9832] ? profile_setup.cold+0xbb/0xbb [ 98.532280][ T9832] ? alloc_list_entry+0xc0/0xc0 [ 98.532294][ T9832] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 98.532311][ T9832] ? find_first_zero_bit+0x9a/0xc0 [ 98.596694][ T9832] __lock_acquire+0x2596/0x4a00 [ 98.601692][ T9832] ? check_noncircular+0x16d/0x3e0 [ 98.606805][ T9832] ? mark_held_locks+0xf0/0xf0 [ 98.612769][ T9832] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 98.619000][ T9832] ? find_first_zero_bit+0x9a/0xc0 [ 98.624162][ T9832] lock_acquire+0x190/0x410 [ 98.628719][ T9832] ? flush_workqueue+0xf7/0x14c0 [ 98.633654][ T9832] flush_workqueue+0x126/0x14c0 [ 98.638497][ T9832] ? flush_workqueue+0xf7/0x14c0 [ 98.643441][ T9832] ? napi_hash_del+0x125/0x170 [ 98.648365][ T9832] ? lock_downgrade+0x920/0x920 [ 98.653906][ T9832] ? pwq_unbound_release_workfn+0x2f0/0x2f0 [ 98.659926][ T9832] ? _raw_spin_unlock+0x28/0x40 [ 98.664764][ T9832] ? kfree_skb+0x10e/0x420 [ 98.669177][ T9832] peer_remove_after_dead+0x16b/0x230 [ 98.674546][ T9832] ? peer_remove_after_dead+0x16b/0x230 [ 98.680204][ T9832] wg_peer_remove+0x244/0x340 [ 98.684873][ T9832] wg_set_device+0xf76/0x1350 [ 98.689555][ T9832] ? set_peer+0x1150/0x1150 [ 98.694065][ T9832] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.700324][ T9832] ? __nla_parse+0x43/0x60 [ 98.704748][ T9832] ? genl_family_rcv_msg_attrs_parse+0x1c6/0x300 [ 98.711069][ T9832] genl_rcv_msg+0x67d/0xea0 [ 98.715588][ T9832] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 98.721911][ T9832] ? __kasan_check_read+0x11/0x20 [ 98.727138][ T9832] ? find_held_lock+0x35/0x130 [ 98.731887][ T9832] netlink_rcv_skb+0x177/0x450 [ 98.736649][ T9832] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 98.742965][ T9832] ? netlink_ack+0xb50/0xb50 [ 98.747557][ T9832] ? __kasan_check_write+0x14/0x20 [ 98.752704][ T9832] ? netlink_deliver_tap+0x248/0xbf0 [ 98.758000][ T9832] genl_rcv+0x29/0x40 [ 98.761961][ T9832] netlink_unicast+0x59e/0x7e0 [ 98.766729][ T9832] ? netlink_attachskb+0x870/0x870 [ 98.771867][ T9832] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 98.777582][ T9832] ? __check_object_size+0x3d/0x437 [ 98.783044][ T9832] netlink_sendmsg+0x91c/0xea0 [ 98.787931][ T9832] ? netlink_unicast+0x7e0/0x7e0 [ 98.792917][ T9832] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 98.798460][ T9832] ? apparmor_socket_sendmsg+0x2a/0x30 [ 98.804147][ T9832] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.810385][ T9832] ? security_socket_sendmsg+0x8d/0xc0 [ 98.815895][ T9832] ? netlink_unicast+0x7e0/0x7e0 [ 98.820868][ T9832] sock_sendmsg+0xd7/0x130 [ 98.825311][ T9832] ____sys_sendmsg+0x753/0x880 [ 98.830083][ T9832] ? kernel_sendmsg+0x50/0x50 [ 98.834793][ T9832] ? debug_object_active_state+0x28a/0x350 [ 98.840636][ T9832] ? find_held_lock+0x35/0x130 [ 98.845475][ T9832] ___sys_sendmsg+0x100/0x170 [ 98.850203][ T9832] ? sendmsg_copy_msghdr+0x70/0x70 [ 98.855310][ T9832] ? lockdep_hardirqs_on+0x421/0x5e0 [ 98.860576][ T9832] ? __kasan_check_read+0x11/0x20 [ 98.865617][ T9832] ? mark_lock+0xc2/0x1220 [ 98.870044][ T9832] ? __kasan_check_read+0x11/0x20 [ 98.875115][ T9832] ? __lock_acquire+0x16f2/0x4a00 [ 98.880147][ T9832] ? debug_object_deactivate+0x320/0x320 [ 98.885819][ T9832] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 98.891978][ T9832] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 98.898319][ T9832] ? __fget_light+0x1ad/0x270 [ 98.902977][ T9832] ? __fdget+0x1b/0x20 [ 98.907038][ T9832] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 98.913271][ T9832] __sys_sendmsg+0x105/0x1d0 [ 98.917841][ T9832] ? __sys_sendmsg_sock+0xc0/0xc0 [ 98.922856][ T9832] ? lockdep_hardirqs_on+0x421/0x5e0 [ 98.928132][ T9832] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 98.933665][ T9832] ? do_syscall_64+0x26/0x790 [ 98.938345][ T9832] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.944429][ T9832] ? do_syscall_64+0x26/0x790 [ 98.949158][ T9832] __x64_sys_sendmsg+0x78/0xb0 [ 98.953911][ T9832] do_syscall_64+0xfa/0x790 [ 98.958413][ T9832] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.964297][ T9832] RIP: 0033:0x446909 [ 98.968233][ T9832] 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 [ 98.987914][ T9832] RSP: 002b:00007ffd70982f18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 98.996349][ T9832] RAX: ffffffffffffffda RBX: 0000000000003064 RCX: 0000000000446909 [ 99.004310][ T9832] RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000004 [ 99.012265][ T9832] RBP: 7261756765726977 R08: 0000000000000000 R09: 0000000001bbbbbb [ 99.020222][ T9832] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 99.028187][ T9832] R13: 00000000004042c0 R14: 0000000000000000 R15: 0000000000000000