[ 95.355128][ T28] audit: type=1800 audit(1580518635.523:28): pid=9883 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. [ 95.787715][ T9949] sshd (9949) used greatest stack depth: 22792 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 96.128542][ T28] audit: type=1800 audit(1580518636.393:29): pid=9883 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 [ 96.148995][ T28] audit: type=1800 audit(1580518636.393:30): pid=9883 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 '10.128.0.188' (ECDSA) to the list of known hosts. syzkaller login: [ 107.615407][T10036] IPVS: ftp: loaded support on port[0] = 21 [ 107.668580][T10036] chnl_net:caif_netlink_parms(): no params data found [ 107.706526][T10036] bridge0: port 1(bridge_slave_0) entered blocking state [ 107.714191][T10036] bridge0: port 1(bridge_slave_0) entered disabled state [ 107.722190][T10036] device bridge_slave_0 entered promiscuous mode [ 107.731246][T10036] bridge0: port 2(bridge_slave_1) entered blocking state [ 107.738610][T10036] bridge0: port 2(bridge_slave_1) entered disabled state [ 107.747112][T10036] device bridge_slave_1 entered promiscuous mode [ 107.765187][T10036] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 107.776749][T10036] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 107.797630][T10036] team0: Port device team_slave_0 added [ 107.805549][T10036] team0: Port device team_slave_1 added [ 107.821912][T10036] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 107.829068][T10036] 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. [ 107.855846][T10036] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 107.868435][T10036] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 107.875488][T10036] 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. [ 107.901546][T10036] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 107.986050][T10036] device hsr_slave_0 entered promiscuous mode [ 108.034555][T10036] device hsr_slave_1 entered promiscuous mode [ 108.150943][T10036] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 108.226584][T10036] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 108.296750][T10036] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 108.376838][T10036] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 108.467947][T10036] bridge0: port 2(bridge_slave_1) entered blocking state [ 108.475682][T10036] bridge0: port 2(bridge_slave_1) entered forwarding state [ 108.483818][T10036] bridge0: port 1(bridge_slave_0) entered blocking state [ 108.490908][T10036] bridge0: port 1(bridge_slave_0) entered forwarding state [ 108.538086][T10036] 8021q: adding VLAN 0 to HW filter on device bond0 [ 108.551577][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 108.561748][ T2841] bridge0: port 1(bridge_slave_0) entered disabled state [ 108.570094][ T2841] bridge0: port 2(bridge_slave_1) entered disabled state [ 108.579695][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 108.592783][T10036] 8021q: adding VLAN 0 to HW filter on device team0 [ 108.604827][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 108.613434][ T2826] bridge0: port 1(bridge_slave_0) entered blocking state [ 108.620726][ T2826] bridge0: port 1(bridge_slave_0) entered forwarding state [ 108.632565][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 108.641939][ T2841] bridge0: port 2(bridge_slave_1) entered blocking state [ 108.649126][ T2841] bridge0: port 2(bridge_slave_1) entered forwarding state [ 108.674277][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready [ 108.683026][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready [ 108.692316][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 108.701471][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 108.710075][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 108.718803][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 108.727497][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 108.737402][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 108.749426][T10036] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 108.761656][T10036] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 108.770063][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 108.778676][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 108.787186][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 108.812310][T10036] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 108.819945][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 108.830478][ T2826] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 108.850113][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 108.859556][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 108.881156][T10036] device veth0_vlan entered promiscuous mode [ 108.888871][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 108.898574][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 108.908644][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 108.916884][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 108.929670][T10036] device veth1_vlan entered promiscuous mode [ 108.951543][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 108.960729][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 108.969187][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 108.977982][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 108.989876][T10036] device veth0_macvtap entered promiscuous mode [ 109.001604][T10036] device veth1_macvtap entered promiscuous mode [ 109.019540][T10036] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 109.027775][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 109.036300][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 109.045133][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 109.054258][ T2705] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 109.067114][T10036] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 109.075211][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 109.084498][ T2841] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 109.234783][T10036] [ 109.237164][T10036] ====================================================== [ 109.244181][T10036] WARNING: possible circular locking dependency detected [ 109.251355][T10036] 5.5.0-syzkaller #0 Not tainted [ 109.256354][T10036] ------------------------------------------------------ [ 109.263474][T10036] syz-executor962/10036 is trying to acquire lock: [ 109.269956][T10036] ffff8880a9696128 ((wq_completion)wg-kex-wireguard0){+.+.}, at: flush_workqueue+0xf7/0x14c0 [ 109.280223][T10036] [ 109.280223][T10036] but task is already holding lock: [ 109.287778][T10036] ffff88808ee54e80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 109.297357][T10036] [ 109.297357][T10036] which lock already depends on the new lock. [ 109.297357][T10036] [ 109.307747][T10036] [ 109.307747][T10036] the existing dependency chain (in reverse order) is: [ 109.316870][T10036] [ 109.316870][T10036] -> #2 (&wg->static_identity.lock){++++}: [ 109.325018][T10036] down_read+0x95/0x430 [ 109.329680][T10036] wg_noise_handshake_create_initiation+0xc0/0x670 [ 109.336693][T10036] wg_packet_send_handshake_initiation+0x185/0x250 [ 109.343732][T10036] wg_packet_handshake_send_worker+0x1d/0x30 [ 109.350251][T10036] process_one_work+0xa05/0x17a0 [ 109.355693][T10036] worker_thread+0x98/0xe40 [ 109.360773][T10036] kthread+0x361/0x430 [ 109.365358][T10036] ret_from_fork+0x24/0x30 [ 109.370443][T10036] [ 109.370443][T10036] -> #1 ((work_completion)(&peer->transmit_handshake_work)){+.+.}: [ 109.380748][T10036] process_one_work+0x972/0x17a0 [ 109.386204][T10036] worker_thread+0x98/0xe40 [ 109.391274][T10036] kthread+0x361/0x430 [ 109.396020][T10036] ret_from_fork+0x24/0x30 [ 109.401103][T10036] [ 109.401103][T10036] -> #0 ((wq_completion)wg-kex-wireguard0){+.+.}: [ 109.409891][T10036] __lock_acquire+0x2596/0x4a00 [ 109.415352][T10036] lock_acquire+0x190/0x410 [ 109.420373][T10036] flush_workqueue+0x126/0x14c0 [ 109.425758][T10036] peer_remove_after_dead+0x16b/0x230 [ 109.431644][T10036] wg_peer_remove+0x244/0x340 [ 109.436956][T10036] wg_set_device+0xf76/0x1350 [ 109.442391][T10036] genl_rcv_msg+0x67d/0xea0 [ 109.447669][T10036] netlink_rcv_skb+0x177/0x450 [ 109.452946][T10036] genl_rcv+0x29/0x40 [ 109.457506][T10036] netlink_unicast+0x59e/0x7e0 [ 109.462937][T10036] netlink_sendmsg+0x91c/0xea0 [ 109.468221][T10036] sock_sendmsg+0xd7/0x130 [ 109.473216][T10036] ____sys_sendmsg+0x753/0x880 [ 109.478761][T10036] ___sys_sendmsg+0x100/0x170 [ 109.484187][T10036] __sys_sendmsg+0x105/0x1d0 [ 109.489621][T10036] __x64_sys_sendmsg+0x78/0xb0 [ 109.495022][T10036] do_syscall_64+0xfa/0x790 [ 109.500040][T10036] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 109.506471][T10036] [ 109.506471][T10036] other info that might help us debug this: [ 109.506471][T10036] [ 109.516741][T10036] Chain exists of: [ 109.516741][T10036] (wq_completion)wg-kex-wireguard0 --> (work_completion)(&peer->transmit_handshake_work) --> &wg->static_identity.lock [ 109.516741][T10036] [ 109.535323][T10036] Possible unsafe locking scenario: [ 109.535323][T10036] [ 109.542819][T10036] CPU0 CPU1 [ 109.548181][T10036] ---- ---- [ 109.553674][T10036] lock(&wg->static_identity.lock); [ 109.558953][T10036] lock((work_completion)(&peer->transmit_handshake_work)); [ 109.570338][T10036] lock(&wg->static_identity.lock); [ 109.578139][T10036] lock((wq_completion)wg-kex-wireguard0); [ 109.584066][T10036] [ 109.584066][T10036] *** DEADLOCK *** [ 109.584066][T10036] [ 109.592210][T10036] 5 locks held by syz-executor962/10036: [ 109.598105][T10036] #0: ffffffff8a7899e8 (cb_lock){++++}, at: genl_rcv+0x1a/0x40 [ 109.605740][T10036] #1: ffffffff8a789aa0 (genl_mutex){+.+.}, at: genl_rcv_msg+0x7de/0xea0 [ 109.614250][T10036] #2: ffffffff8a733c80 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 [ 109.622403][T10036] #3: ffff88808ee550a0 (&wg->device_update_lock){+.+.}, at: wg_set_device+0x2be/0x1350 [ 109.632258][T10036] #4: ffff88808ee54e80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350 [ 109.642322][T10036] [ 109.642322][T10036] stack backtrace: [ 109.650099][T10036] CPU: 0 PID: 10036 Comm: syz-executor962 Not tainted 5.5.0-syzkaller #0 [ 109.658503][T10036] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 109.668551][T10036] Call Trace: [ 109.672005][T10036] dump_stack+0x197/0x210 [ 109.676338][T10036] print_circular_bug.isra.0.cold+0x163/0x172 [ 109.683458][T10036] check_noncircular+0x32e/0x3e0 [ 109.688398][T10036] ? print_circular_bug.isra.0+0x230/0x230 [ 109.694207][T10036] ? profile_setup.cold+0xbb/0xbb [ 109.699254][T10036] ? alloc_list_entry+0xc0/0xc0 [ 109.704111][T10036] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 109.710354][T10036] ? find_first_zero_bit+0x9a/0xc0 [ 109.715474][T10036] __lock_acquire+0x2596/0x4a00 [ 109.720793][T10036] ? check_noncircular+0x16d/0x3e0 [ 109.725940][T10036] ? mark_held_locks+0xf0/0xf0 [ 109.730698][T10036] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 109.736932][T10036] ? find_first_zero_bit+0x9a/0xc0 [ 109.742240][T10036] lock_acquire+0x190/0x410 [ 109.746744][T10036] ? flush_workqueue+0xf7/0x14c0 [ 109.751688][T10036] flush_workqueue+0x126/0x14c0 [ 109.756730][T10036] ? flush_workqueue+0xf7/0x14c0 [ 109.761888][T10036] ? napi_hash_del+0x125/0x170 [ 109.766641][T10036] ? lock_downgrade+0x920/0x920 [ 109.771761][T10036] ? pwq_unbound_release_workfn+0x2f0/0x2f0 [ 109.777878][T10036] ? _raw_spin_unlock+0x28/0x40 [ 109.782739][T10036] ? kfree_skb+0x10e/0x420 [ 109.787157][T10036] peer_remove_after_dead+0x16b/0x230 [ 109.792576][T10036] ? peer_remove_after_dead+0x16b/0x230 [ 109.798112][T10036] wg_peer_remove+0x244/0x340 [ 109.802938][T10036] wg_set_device+0xf76/0x1350 [ 109.807606][T10036] ? set_peer+0x1150/0x1150 [ 109.812113][T10036] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 109.818362][T10036] ? __nla_parse+0x43/0x60 [ 109.822860][T10036] ? genl_family_rcv_msg_attrs_parse+0x1c6/0x300 [ 109.829290][T10036] genl_rcv_msg+0x67d/0xea0 [ 109.833823][T10036] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 109.840188][T10036] ? __kasan_check_read+0x11/0x20 [ 109.845211][T10036] ? find_held_lock+0x35/0x130 [ 109.849977][T10036] netlink_rcv_skb+0x177/0x450 [ 109.854745][T10036] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 109.861147][T10036] ? netlink_ack+0xb50/0xb50 [ 109.865745][T10036] ? __kasan_check_write+0x14/0x20 [ 109.871070][T10036] ? netlink_deliver_tap+0x248/0xbf0 [ 109.876361][T10036] genl_rcv+0x29/0x40 [ 109.880344][T10036] netlink_unicast+0x59e/0x7e0 [ 109.885351][T10036] ? netlink_attachskb+0x870/0x870 [ 109.890459][T10036] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 109.896175][T10036] ? __check_object_size+0x3d/0x437 [ 109.901398][T10036] netlink_sendmsg+0x91c/0xea0 [ 109.906266][T10036] ? netlink_unicast+0x7e0/0x7e0 [ 109.911190][T10036] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 109.916724][T10036] ? apparmor_socket_sendmsg+0x2a/0x30 [ 109.922184][T10036] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 109.928416][T10036] ? security_socket_sendmsg+0x8d/0xc0 [ 109.933873][T10036] ? netlink_unicast+0x7e0/0x7e0 [ 109.938822][T10036] sock_sendmsg+0xd7/0x130 [ 109.943355][T10036] ____sys_sendmsg+0x753/0x880 [ 109.948191][T10036] ? kernel_sendmsg+0x50/0x50 [ 109.953069][T10036] ? debug_object_active_state+0x28a/0x350 [ 109.958872][T10036] ? find_held_lock+0x35/0x130 [ 109.963652][T10036] ___sys_sendmsg+0x100/0x170 [ 109.968337][T10036] ? sendmsg_copy_msghdr+0x70/0x70 [ 109.973445][T10036] ? lockdep_hardirqs_on+0x421/0x5e0 [ 109.978728][T10036] ? __kasan_check_read+0x11/0x20 [ 109.983750][T10036] ? mark_lock+0xc2/0x1220 [ 109.988222][T10036] ? __kasan_check_read+0x11/0x20 [ 109.993248][T10036] ? __lock_acquire+0x16f2/0x4a00 [ 109.998392][T10036] ? debug_object_deactivate+0x320/0x320 [ 110.004018][T10036] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 110.010175][T10036] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 110.016594][T10036] ? __fget_light+0x1ad/0x270 [ 110.021314][T10036] ? __fdget+0x1b/0x20 [ 110.025451][T10036] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 110.031840][T10036] __sys_sendmsg+0x105/0x1d0 [ 110.036425][T10036] ? __sys_sendmsg_sock+0xc0/0xc0 [ 110.041508][T10036] ? lockdep_hardirqs_on+0x421/0x5e0 [ 110.046806][T10036] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 110.052255][T10036] ? do_syscall_64+0x26/0x790 [ 110.056997][T10036] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 110.063059][T10036] ? do_syscall_64+0x26/0x790 [ 110.067733][T10036] __x64_sys_sendmsg+0x78/0xb0 [ 110.072499][T10036] do_syscall_64+0xfa/0x790 [ 110.076990][T10036] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 110.082875][T10036] RIP: 0033:0x4491c9 [ 110.086810][T10036] 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 [ 110.106777][T10036] RSP: 002b:00007ffcc45f9878 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 110.115242][T10036] RAX: ffffffffffffffda RBX: 0000000000003064 RCX: 00000000004491c9 [ 110.123241][T10036] RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000004 [ 110.131290][T10036] RBP: 7261756765726977 R08: 0000000000000000 R09: 0000000001bbbbb