[ 105.278163][ T27] audit: type=1800 audit(1580541585.354:26): pid=9826 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 106.350261][ T27] kauditd_printk_skb: 2 callbacks suppressed
[ 106.350272][ T27] audit: type=1800 audit(1580541586.444:29): pid=9826 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
[ 106.376827][ T27] audit: type=1800 audit(1580541586.444:30): pid=9826 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 '10.128.0.119' (ECDSA) to the list of known hosts.
syzkaller login: [ 127.471054][ T9979] IPVS: ftp: loaded support on port[0] = 21
[ 127.522928][ T9979] chnl_net:caif_netlink_parms(): no params data found
[ 127.558634][ T9979] bridge0: port 1(bridge_slave_0) entered blocking state
[ 127.566044][ T9979] bridge0: port 1(bridge_slave_0) entered disabled state
[ 127.574053][ T9979] device bridge_slave_0 entered promiscuous mode
[ 127.582485][ T9979] bridge0: port 2(bridge_slave_1) entered blocking state
[ 127.589791][ T9979] bridge0: port 2(bridge_slave_1) entered disabled state
[ 127.598127][ T9979] device bridge_slave_1 entered promiscuous mode
[ 127.616387][ T9979] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 127.627712][ T9979] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 127.646545][ T9979] team0: Port device team_slave_0 added
[ 127.654255][ T9979] team0: Port device team_slave_1 added
[ 127.669397][ T9979] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 127.676339][ T9979] 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.
[ 127.702529][ T9979] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 127.715573][ T9979] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 127.722654][ T9979] 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.
[ 127.748643][ T9979] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 127.809403][ T9979] device hsr_slave_0 entered promiscuous mode
[ 127.847123][ T9979] device hsr_slave_1 entered promiscuous mode
[ 127.993504][ T9979] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 128.030228][ T9979] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 128.089941][ T9979] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 128.159139][ T9979] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 128.209987][ T9979] bridge0: port 2(bridge_slave_1) entered blocking state
[ 128.217721][ T9979] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 128.225407][ T9979] bridge0: port 1(bridge_slave_0) entered blocking state
[ 128.233655][ T9979] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 128.278377][ T9979] 8021q: adding VLAN 0 to HW filter on device bond0
[ 128.292165][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[ 128.302537][ T2726] bridge0: port 1(bridge_slave_0) entered disabled state
[ 128.311259][ T2726] bridge0: port 2(bridge_slave_1) entered disabled state
[ 128.319990][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[ 128.333050][ T9979] 8021q: adding VLAN 0 to HW filter on device team0
[ 128.344477][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[ 128.352977][ T2707] bridge0: port 1(bridge_slave_0) entered blocking state
[ 128.360045][ T2707] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 128.371699][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[ 128.380981][ T2726] bridge0: port 2(bridge_slave_1) entered blocking state
[ 128.388096][ T2726] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 128.408161][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[ 128.427561][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[ 128.435716][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[ 128.444487][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[ 128.452839][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[ 128.465800][ T9979] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[ 128.485170][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[ 128.492753][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[ 128.506005][ T9979] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 128.525731][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready
[ 128.534509][ T2703] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[ 128.554581][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready
[ 128.563177][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[ 128.572565][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[ 128.581567][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[ 128.595643][ T9979] device veth0_vlan entered promiscuous mode
[ 128.608396][ T9979] device veth1_vlan entered promiscuous mode
[ 128.630404][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[ 128.639048][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[ 128.647472][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
[ 128.655963][ T2726] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[ 128.668914][ T9979] device veth0_macvtap entered promiscuous mode
[ 128.679545][ T9979] device veth1_macvtap entered promiscuous mode
[ 128.697882][ T9979] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 128.705774][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[ 128.714940][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
[ 128.723407][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
[ 128.732322][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[ 128.746938][ T9979] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 128.758874][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
[ 128.768943][ T2707] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
executing program
[ 128.918178][ T9979]
[ 128.920532][ T9979] ======================================================
[ 128.927536][ T9979] WARNING: possible circular locking dependency detected
[ 128.934582][ T9979] 5.5.0-syzkaller #0 Not tainted
[ 128.939498][ T9979] ------------------------------------------------------
[ 128.946503][ T9979] syz-executor536/9979 is trying to acquire lock:
[ 128.952898][ T9979] ffff8880a8df2128 ((wq_completion)wg-kex-wireguard0){+.+.}, at: flush_workqueue+0xf7/0x14c0
[ 128.963065][ T9979]
[ 128.963065][ T9979] but task is already holding lock:
[ 128.970503][ T9979] ffff88809d9bce80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350
[ 128.979986][ T9979]
[ 128.979986][ T9979] which lock already depends on the new lock.
[ 128.979986][ T9979]
[ 128.990377][ T9979]
[ 128.990377][ T9979] the existing dependency chain (in reverse order) is:
[ 128.999381][ T9979]
[ 128.999381][ T9979] -> #2 (&wg->static_identity.lock){++++}:
[ 129.007437][ T9979] down_read+0x95/0x430
[ 129.012094][ T9979] wg_noise_handshake_create_initiation+0xc0/0x670
[ 129.019108][ T9979] wg_packet_send_handshake_initiation+0x185/0x250
[ 129.026229][ T9979] wg_packet_handshake_send_worker+0x1d/0x30
[ 129.032708][ T9979] process_one_work+0xa05/0x17a0
[ 129.038150][ T9979] worker_thread+0x98/0xe40
[ 129.043169][ T9979] kthread+0x361/0x430
[ 129.047746][ T9979] ret_from_fork+0x24/0x30
[ 129.052659][ T9979]
[ 129.052659][ T9979] -> #1 ((work_completion)(&peer->transmit_handshake_work)){+.+.}:
[ 129.062752][ T9979] process_one_work+0x972/0x17a0
[ 129.068205][ T9979] worker_thread+0x98/0xe40
[ 129.073208][ T9979] kthread+0x361/0x430
[ 129.077788][ T9979] ret_from_fork+0x24/0x30
[ 129.082699][ T9979]
[ 129.082699][ T9979] -> #0 ((wq_completion)wg-kex-wireguard0){+.+.}:
[ 129.091336][ T9979] __lock_acquire+0x2596/0x4a00
[ 129.097222][ T9979] lock_acquire+0x190/0x410
[ 129.102224][ T9979] flush_workqueue+0x126/0x14c0
[ 129.107627][ T9979] peer_remove_after_dead+0x16b/0x230
[ 129.113499][ T9979] wg_peer_remove+0x244/0x340
[ 129.118682][ T9979] wg_set_device+0xf76/0x1350
[ 129.123920][ T9979] genl_rcv_msg+0x67d/0xea0
[ 129.128933][ T9979] netlink_rcv_skb+0x177/0x450
[ 129.134228][ T9979] genl_rcv+0x29/0x40
[ 129.138712][ T9979] netlink_unicast+0x59e/0x7e0
[ 129.143992][ T9979] netlink_sendmsg+0x91c/0xea0
[ 129.149267][ T9979] sock_sendmsg+0xd7/0x130
[ 129.154225][ T9979] ____sys_sendmsg+0x753/0x880
[ 129.159503][ T9979] ___sys_sendmsg+0x100/0x170
[ 129.164684][ T9979] __sys_sendmsg+0x105/0x1d0
[ 129.169787][ T9979] __ia32_compat_sys_sendmsg+0x7a/0xb0
[ 129.175751][ T9979] do_fast_syscall_32+0x27b/0xe16
[ 129.181325][ T9979] entry_SYSENTER_compat+0x70/0x7f
[ 129.186933][ T9979]
[ 129.186933][ T9979] other info that might help us debug this:
[ 129.186933][ T9979]
[ 129.197184][ T9979] Chain exists of:
[ 129.197184][ T9979] (wq_completion)wg-kex-wireguard0 --> (work_completion)(&peer->transmit_handshake_work) --> &wg->static_identity.lock
[ 129.197184][ T9979]
[ 129.215485][ T9979] Possible unsafe locking scenario:
[ 129.215485][ T9979]
[ 129.222971][ T9979] CPU0 CPU1
[ 129.228385][ T9979] ---- ----
[ 129.233734][ T9979] lock(&wg->static_identity.lock);
[ 129.238995][ T9979] lock((work_completion)(&peer->transmit_handshake_work));
[ 129.248866][ T9979] lock(&wg->static_identity.lock);
[ 129.256695][ T9979] lock((wq_completion)wg-kex-wireguard0);
[ 129.263064][ T9979]
[ 129.263064][ T9979] *** DEADLOCK ***
[ 129.263064][ T9979]
[ 129.271241][ T9979] 5 locks held by syz-executor536/9979:
[ 129.276766][ T9979] #0: ffffffff8a78c128 (cb_lock){++++}, at: genl_rcv+0x1a/0x40
[ 129.284448][ T9979] #1: ffffffff8a78c1e0 (genl_mutex){+.+.}, at: genl_rcv_msg+0x7de/0xea0
[ 129.292858][ T9979] #2: ffffffff8a7363c0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20
[ 129.300878][ T9979] #3: ffff88809d9bd0a0 (&wg->device_update_lock){+.+.}, at: wg_set_device+0x2be/0x1350
[ 129.310594][ T9979] #4: ffff88809d9bce80 (&wg->static_identity.lock){++++}, at: wg_set_device+0xe8b/0x1350
[ 129.320481][ T9979]
[ 129.320481][ T9979] stack backtrace:
[ 129.326369][ T9979] CPU: 1 PID: 9979 Comm: syz-executor536 Not tainted 5.5.0-syzkaller #0
[ 129.334676][ T9979] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 129.344723][ T9979] Call Trace:
[ 129.348000][ T9979] dump_stack+0x197/0x210
[ 129.352309][ T9979] print_circular_bug.isra.0.cold+0x163/0x172
[ 129.358362][ T9979] check_noncircular+0x32e/0x3e0
[ 129.363299][ T9979] ? print_circular_bug.isra.0+0x230/0x230
[ 129.369139][ T9979] ? profile_setup.cold+0xbb/0xbb
[ 129.374152][ T9979] ? alloc_list_entry+0xc0/0xc0
[ 129.378992][ T9979] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[ 129.385261][ T9979] ? find_first_zero_bit+0x9a/0xc0
[ 129.390372][ T9979] __lock_acquire+0x2596/0x4a00
[ 129.395205][ T9979] ? check_noncircular+0x16d/0x3e0
[ 129.400300][ T9979] ? mark_held_locks+0xf0/0xf0
[ 129.405048][ T9979] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[ 129.411270][ T9979] ? find_first_zero_bit+0x9a/0xc0
[ 129.416364][ T9979] lock_acquire+0x190/0x410
[ 129.420845][ T9979] ? flush_workqueue+0xf7/0x14c0
[ 129.425761][ T9979] flush_workqueue+0x126/0x14c0
[ 129.430593][ T9979] ? flush_workqueue+0xf7/0x14c0
[ 129.435534][ T9979] ? napi_hash_del+0x125/0x170
[ 129.440286][ T9979] ? lock_downgrade+0x920/0x920
[ 129.445128][ T9979] ? pwq_unbound_release_workfn+0x2f0/0x2f0
[ 129.451007][ T9979] ? _raw_spin_unlock+0x28/0x40
[ 129.455908][ T9979] ? kfree_skb+0x10e/0x420
[ 129.460316][ T9979] peer_remove_after_dead+0x16b/0x230
[ 129.465664][ T9979] ? peer_remove_after_dead+0x16b/0x230
[ 129.471201][ T9979] wg_peer_remove+0x244/0x340
[ 129.475864][ T9979] wg_set_device+0xf76/0x1350
[ 129.480625][ T9979] ? set_peer+0x1150/0x1150
[ 129.485112][ T9979] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 129.491344][ T9979] ? __nla_parse+0x43/0x60
[ 129.495756][ T9979] ? genl_family_rcv_msg_attrs_parse+0x1c6/0x300
[ 129.502117][ T9979] genl_rcv_msg+0x67d/0xea0
[ 129.506622][ T9979] ? genl_family_rcv_msg_attrs_parse+0x300/0x300
[ 129.512947][ T9979] ? __kasan_check_read+0x11/0x20
[ 129.517979][ T9979] ? find_held_lock+0x35/0x130
[ 129.522736][ T9979] netlink_rcv_skb+0x177/0x450
[ 129.527498][ T9979] ? genl_family_rcv_msg_attrs_parse+0x300/0x300
[ 129.533819][ T9979] ? netlink_ack+0xb50/0xb50
[ 129.538400][ T9979] ? __kasan_check_write+0x14/0x20
[ 129.543550][ T9979] ? netlink_deliver_tap+0x248/0xbf0
[ 129.550570][ T9979] genl_rcv+0x29/0x40
[ 129.554671][ T9979] netlink_unicast+0x59e/0x7e0
[ 129.559439][ T9979] ? netlink_attachskb+0x870/0x870
[ 129.564546][ T9979] ? __sanitizer_cov_trace_cmp8+0x18/0x20
[ 129.570253][ T9979] ? __check_object_size+0x3d/0x437
[ 129.575450][ T9979] netlink_sendmsg+0x91c/0xea0
[ 129.580212][ T9979] ? netlink_unicast+0x7e0/0x7e0
[ 129.585183][ T9979] ? aa_sock_msg_perm.isra.0+0xba/0x170
[ 129.590720][ T9979] ? apparmor_socket_sendmsg+0x2a/0x30
[ 129.596166][ T9979] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 129.602406][ T9979] ? security_socket_sendmsg+0x8d/0xc0
[ 129.607897][ T9979] ? netlink_unicast+0x7e0/0x7e0
[ 129.612882][ T9979] sock_sendmsg+0xd7/0x130
[ 129.617290][ T9979] ____sys_sendmsg+0x753/0x880
[ 129.622055][ T9979] ? kernel_sendmsg+0x50/0x50
[ 129.626720][ T9979] ? debug_object_active_state+0x28a/0x350
[ 129.632538][ T9979] ? find_held_lock+0x35/0x130
[ 129.637299][ T9979] ___sys_sendmsg+0x100/0x170
[ 129.642001][ T9979] ? sendmsg_copy_msghdr+0x70/0x70
[ 129.647149][ T9979] ? lockdep_hardirqs_on+0x421/0x5e0
[ 129.652423][ T9979] ? __kasan_check_read+0x11/0x20
[ 129.657430][ T9979] ? mark_lock+0xc2/0x1220
[ 129.661840][ T9979] ? __kasan_check_read+0x11/0x20
[ 129.666852][ T9979] ? __lock_acquire+0x16f2/0x4a00
[ 129.671867][ T9979] ? debug_object_deactivate+0x320/0x320
[ 129.678885][ T9979] ? rcu_lockdep_current_cpu_online+0xe3/0x130
[ 129.685059][ T9979] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 129.691344][ T9979] ? __fget_light+0x1ad/0x270
[ 129.696018][ T9979] ? __fdget+0x1b/0x20
[ 129.700118][ T9979] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[ 129.706345][ T9979] __sys_sendmsg+0x105/0x1d0
[ 129.710936][ T9979] ? __sys_sendmsg_sock+0xc0/0xc0
[ 129.715947][ T9979] ? lockdep_hardirqs_on+0x421/0x5e0
[ 129.721228][ T9979] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 129.726702][ T9979] ? do_fast_syscall_32+0xd1/0xe16
[ 129.731800][ T9979] ? entry_SYSENTER_compat+0x70/0x7f
[ 129.737086][ T9979] ? do_fast_syscall_32+0xd1/0xe16
[ 129.742244][ T9979] __ia32_compat_sys_sendmsg+0x7a/0xb0
[ 129.747702][ T9979] do_fast_syscall_32+0x27b/0xe16
[ 129.752711][ T9979] entry_SYSENTER_compat+0x70/0x7f
[ 129.757810][ T9979] RIP: 0023:0xf7f88e39
[ 129.761870][ T9979] Code: 1d 00 00 00 89 d3 5b 5e 5d c3 8b 04 24 c3 8b 1c 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
[ 129.781835][ T9979] RSP: 002b:00000000ffacc0cc EFLAGS: 00000246 ORIG_RAX: 0000000000000172
[ 129.790229][ T9979] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020001340
[ 129.798183][ T9979] RDX: 0000000000000000 RSI: 00000000f7f8828c RDI: 0000000000000004
[ 129.806141][ T9979] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 129.814237][ T9979] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[