[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.837408][ T27] audit: type=1800 audit(1563970747.901:25): pid=9080 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.878393][ T27] audit: type=1800 audit(1563970747.901:26): pid=9080 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.914856][ T27] audit: type=1800 audit(1563970747.901:27): pid=9080 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.92' (ECDSA) to the list of known hosts. syzkaller login: [ 74.699045][ T9234] IPVS: ftp: loaded support on port[0] = 21 [ 74.756497][ T9234] chnl_net:caif_netlink_parms(): no params data found [ 74.785023][ T9234] bridge0: port 1(bridge_slave_0) entered blocking state [ 74.792286][ T9234] bridge0: port 1(bridge_slave_0) entered disabled state [ 74.801037][ T9234] device bridge_slave_0 entered promiscuous mode [ 74.808891][ T9234] bridge0: port 2(bridge_slave_1) entered blocking state [ 74.816128][ T9234] bridge0: port 2(bridge_slave_1) entered disabled state [ 74.823749][ T9234] device bridge_slave_1 entered promiscuous mode [ 74.840539][ T9234] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 74.852088][ T9234] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 74.870820][ T9234] team0: Port device team_slave_0 added [ 74.878205][ T9234] team0: Port device team_slave_1 added [ 74.944471][ T9234] device hsr_slave_0 entered promiscuous mode [ 75.002771][ T9234] device hsr_slave_1 entered promiscuous mode [ 75.080663][ T9234] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.087869][ T9234] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.095573][ T9234] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.102664][ T9234] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.137733][ T9234] 8021q: adding VLAN 0 to HW filter on device bond0 [ 75.148742][ T2915] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 75.168495][ T2915] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.176698][ T2915] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.186105][ T2915] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 75.198248][ T9234] 8021q: adding VLAN 0 to HW filter on device team0 [ 75.208709][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 75.217278][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.224378][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 75.243066][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 75.251429][ T12] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.258536][ T12] bridge0: port 2(bridge_slave_1) entered forwarding state [ 75.267331][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.280338][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 75.288308][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.299622][ T2915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 75.310345][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 75.320701][ T9234] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program [ 75.339529][ T9234] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 75.376116][ C1] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 75.545653][ C0] BUG: spinlock recursion on CPU#0, syz-executor870/9234 [ 75.552736][ C0] lock: 0xffff88808a206d08, .magic: dead4ead, .owner: syz-executor870/9234, .owner_cpu: 0 [ 75.562851][ C0] CPU: 0 PID: 9234 Comm: syz-executor870 Not tainted 5.3.0-rc1-next-20190724 #50 [ 75.571984][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.582030][ C0] Call Trace: [ 75.585301][ C0] [ 75.588137][ C0] dump_stack+0x172/0x1f0 [ 75.592446][ C0] spin_dump.cold+0x81/0xe6 [ 75.596937][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.603169][ C0] do_raw_spin_lock+0x252/0x2e0 [ 75.608011][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 75.612944][ C0] ? lock_acquire+0x190/0x410 [ 75.617610][ C0] ? release_sock+0x20/0x1c0 [ 75.622199][ C0] ? __kasan_check_read+0x11/0x20 [ 75.627216][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 75.631973][ C0] ? release_sock+0x20/0x1c0 [ 75.636549][ C0] release_sock+0x20/0x1c0 [ 75.640996][ C0] wait_on_pending_writer+0x20f/0x420 [ 75.646366][ C0] ? ip6_rcv_finish+0x1de/0x2f0 [ 75.651208][ C0] ? tls_init+0x560/0x560 [ 75.655529][ C0] ? process_backlog+0x206/0x750 [ 75.660453][ C0] ? net_rx_action+0x508/0x10c0 [ 75.665292][ C0] ? __do_softirq+0x262/0x98c [ 75.669962][ C0] ? prepare_to_wait_exclusive+0x320/0x320 [ 75.675766][ C0] ? inet_release+0xed/0x200 [ 75.680348][ C0] ? inet6_release+0x53/0x80 [ 75.684942][ C0] ? __sock_release+0xce/0x280 [ 75.689696][ C0] ? sock_close+0x1e/0x30 [ 75.694015][ C0] ? __fput+0x2ff/0x890 [ 75.698162][ C0] ? ____fput+0x16/0x20 [ 75.702762][ C0] ? task_work_run+0x145/0x1c0 [ 75.707520][ C0] ? exit_to_usermode_loop+0x316/0x380 [ 75.712976][ C0] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 75.718163][ C0] ? wait_on_pending_writer+0x420/0x420 [ 75.723705][ C0] tls_sk_proto_unhash+0x90/0x3f0 [ 75.728719][ C0] ? kfree_skbmem+0xa5/0x150 [ 75.733303][ C0] tcp_set_state+0x5b9/0x7d0 [ 75.737887][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 75.744116][ C0] ? __sk_mem_reduce_allocated+0x190/0x560 [ 75.749919][ C0] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 75.755375][ C0] ? __sk_mem_reclaim+0x55/0x70 [ 75.760215][ C0] ? tcp_write_queue_purge+0x5d8/0x1310 [ 75.765758][ C0] tcp_done+0xe2/0x320 [ 75.769846][ C0] tcp_reset+0x132/0x500 [ 75.774078][ C0] tcp_validate_incoming+0xa2d/0x1660 [ 75.779447][ C0] tcp_rcv_established+0x6b5/0x1e70 [ 75.784640][ C0] ? mark_held_locks+0xf0/0xf0 [ 75.789395][ C0] ? sk_filter_trim_cap+0x45f/0xb30 [ 75.794586][ C0] ? tcp_data_queue+0x4860/0x4860 [ 75.799603][ C0] ? do_raw_spin_lock+0x12a/0x2e0 [ 75.804617][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 75.810214][ C0] ? lock_acquire+0x190/0x410 [ 75.814885][ C0] tcp_v6_do_rcv+0x41e/0x12c0 [ 75.819558][ C0] tcp_v6_rcv+0x31f1/0x3500 [ 75.824061][ C0] ? __kasan_check_read+0x11/0x20 [ 75.829074][ C0] ? mark_lock+0x98/0x11e0 [ 75.833493][ C0] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 75.839036][ C0] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 75.844678][ C0] ip6_input_finish+0x84/0x170 [ 75.849442][ C0] ip6_input+0xe4/0x3f0 [ 75.853592][ C0] ? ip6_input_finish+0x170/0x170 [ 75.858608][ C0] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 75.864493][ C0] ? lock_downgrade+0x920/0x920 [ 75.869339][ C0] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 75.875574][ C0] ip6_rcv_finish+0x1de/0x2f0 [ 75.880241][ C0] ipv6_rcv+0x10e/0x420 [ 75.884392][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 75.889841][ C0] ? __kasan_check_read+0x11/0x20 [ 75.894853][ C0] ? mark_lock+0xc0/0x11e0 [ 75.899273][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 75.905161][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 75.910608][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 75.916491][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 75.922375][ C0] ? lock_acquire+0x190/0x410 [ 75.927043][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.933275][ C0] __netif_receive_skb+0x2c/0x1d0 [ 75.938304][ C0] process_backlog+0x206/0x750 [ 75.943101][ C0] ? net_rx_action+0x27b/0x10c0 [ 75.947946][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 75.953222][ C0] net_rx_action+0x508/0x10c0 [ 75.957893][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 75.963095][ C0] __do_softirq+0x262/0x98c [ 75.967593][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 75.972961][ C0] do_softirq_own_stack+0x2a/0x40 [ 75.977974][ C0] [ 75.980904][ C0] do_softirq.part.0+0x11a/0x170 [ 75.985840][ C0] __local_bh_enable_ip+0x211/0x270 [ 75.991031][ C0] inet_csk_listen_stop+0x1e0/0x850 [ 75.996226][ C0] tcp_close+0xd5b/0x10e0 [ 76.000551][ C0] ? ip_mc_drop_socket+0x211/0x270 [ 76.005662][ C0] ? down_write+0xdf/0x150 [ 76.010069][ C0] inet_release+0xed/0x200 [ 76.014480][ C0] inet6_release+0x53/0x80 [ 76.018889][ C0] __sock_release+0xce/0x280 [ 76.023472][ C0] sock_close+0x1e/0x30 [ 76.027625][ C0] __fput+0x2ff/0x890 [ 76.031596][ C0] ? __sock_release+0x280/0x280 [ 76.036437][ C0] ____fput+0x16/0x20 [ 76.040410][ C0] task_work_run+0x145/0x1c0 [ 76.045014][ C0] exit_to_usermode_loop+0x316/0x380 [ 76.050290][ C0] do_syscall_64+0x65f/0x760 [ 76.054873][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.060755][ C0] RIP: 0033:0x406581 [ 76.064645][ C0] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 24 1a 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 76.084241][ C0] RSP: 002b:00007ffc27db6ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 76.092643][ C0] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406581 [ 76.100619][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 76.108576][ C0] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 76.116537][ C0] R10: 00007ffc27db6cd0 R11: 0000000000000293 R12: 00007ffc27db6d00 [ 76.124495][ C0] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007