[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.460287][ T26] audit: type=1800 audit(1563969036.371:25): pid=8927 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.505736][ T26] audit: type=1800 audit(1563969036.371:26): pid=8927 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.569332][ T26] audit: type=1800 audit(1563969036.381:27): pid=8927 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 '10.128.0.200' (ECDSA) to the list of known hosts. syzkaller login: [ 72.377466][ T9080] IPVS: ftp: loaded support on port[0] = 21 [ 72.434225][ T9080] chnl_net:caif_netlink_parms(): no params data found [ 72.463287][ T9080] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.471158][ T9080] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.479151][ T9080] device bridge_slave_0 entered promiscuous mode [ 72.487698][ T9080] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.494802][ T9080] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.502966][ T9080] device bridge_slave_1 entered promiscuous mode [ 72.520438][ T9080] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.531352][ T9080] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.550777][ T9080] team0: Port device team_slave_0 added [ 72.558043][ T9080] team0: Port device team_slave_1 added [ 72.637643][ T9080] device hsr_slave_0 entered promiscuous mode [ 72.697279][ T9080] device hsr_slave_1 entered promiscuous mode [ 72.743408][ T9080] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.750608][ T9080] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.758602][ T9080] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.765741][ T9080] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.799584][ T9080] 8021q: adding VLAN 0 to HW filter on device bond0 [ 72.813053][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 72.833971][ T5] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.842731][ T5] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.851982][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 72.863446][ T9080] 8021q: adding VLAN 0 to HW filter on device team0 [ 72.874489][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 72.883662][ T3514] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.890820][ T3514] bridge0: port 1(bridge_slave_0) entered forwarding state [ 72.907242][ T9082] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 72.915873][ T9082] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.922993][ T9082] bridge0: port 2(bridge_slave_1) entered forwarding state [ 72.940914][ T9080] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 72.953920][ T9080] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 72.968244][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 72.977685][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 72.986368][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 72.995077][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 73.004213][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.012139][ T3514] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.031374][ T9080] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.071847][ C0] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 73.246332][ C0] BUG: spinlock recursion on CPU#0, syz-executor213/9080 [ 73.253391][ C0] lock: 0xffff88808ba96d08, .magic: dead4ead, .owner: syz-executor213/9080, .owner_cpu: 0 [ 73.263426][ C0] CPU: 0 PID: 9080 Comm: syz-executor213 Not tainted 5.3.0-rc1-next-20190724 #50 [ 73.272533][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.282590][ C0] Call Trace: [ 73.285862][ C0] [ 73.288707][ C0] dump_stack+0x172/0x1f0 [ 73.293243][ C0] spin_dump.cold+0x81/0xe6 [ 73.297729][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.303947][ C0] do_raw_spin_lock+0x252/0x2e0 [ 73.308801][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 73.313725][ C0] ? lock_acquire+0x190/0x410 [ 73.318403][ C0] ? release_sock+0x20/0x1c0 [ 73.322985][ C0] ? __kasan_check_read+0x11/0x20 [ 73.328032][ C0] _raw_spin_lock_bh+0x3b/0x50 [ 73.332787][ C0] ? release_sock+0x20/0x1c0 [ 73.337377][ C0] release_sock+0x20/0x1c0 [ 73.341778][ C0] wait_on_pending_writer+0x20f/0x420 [ 73.347164][ C0] ? ip6_rcv_finish+0x1de/0x2f0 [ 73.352030][ C0] ? tls_init+0x560/0x560 [ 73.356366][ C0] ? process_backlog+0x206/0x750 [ 73.361283][ C0] ? net_rx_action+0x508/0x10c0 [ 73.366112][ C0] ? __do_softirq+0x262/0x98c [ 73.370783][ C0] ? prepare_to_wait_exclusive+0x320/0x320 [ 73.376593][ C0] ? inet_release+0xed/0x200 [ 73.381165][ C0] ? inet6_release+0x53/0x80 [ 73.385743][ C0] ? __sock_release+0xce/0x280 [ 73.390491][ C0] ? sock_close+0x1e/0x30 [ 73.394799][ C0] ? __fput+0x2ff/0x890 [ 73.398932][ C0] ? ____fput+0x16/0x20 [ 73.403063][ C0] ? task_work_run+0x145/0x1c0 [ 73.408010][ C0] ? exit_to_usermode_loop+0x316/0x380 [ 73.413456][ C0] tls_sk_proto_cleanup+0x2c5/0x3e0 [ 73.418655][ C0] ? wait_on_pending_writer+0x420/0x420 [ 73.424190][ C0] tls_sk_proto_unhash+0x90/0x3f0 [ 73.429211][ C0] ? kfree_skbmem+0xa5/0x150 [ 73.433787][ C0] tcp_set_state+0x5b9/0x7d0 [ 73.438358][ C0] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 73.444578][ C0] ? __sk_mem_reduce_allocated+0x190/0x560 [ 73.450366][ C0] ? tcp_alloc_md5sig_pool+0x4a0/0x4a0 [ 73.455814][ C0] ? __sk_mem_reclaim+0x55/0x70 [ 73.460675][ C0] ? tcp_write_queue_purge+0x5d8/0x1310 [ 73.466232][ C0] tcp_done+0xe2/0x320 [ 73.470297][ C0] tcp_reset+0x132/0x500 [ 73.474528][ C0] tcp_validate_incoming+0xa2d/0x1660 [ 73.479886][ C0] tcp_rcv_established+0x6b5/0x1e70 [ 73.485066][ C0] ? mark_held_locks+0xf0/0xf0 [ 73.489827][ C0] ? sk_filter_trim_cap+0x45f/0xb30 [ 73.495010][ C0] ? tcp_data_queue+0x4860/0x4860 [ 73.500121][ C0] ? do_raw_spin_lock+0x12a/0x2e0 [ 73.505126][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 73.510062][ C0] ? lock_acquire+0x190/0x410 [ 73.514727][ C0] tcp_v6_do_rcv+0x41e/0x12c0 [ 73.519396][ C0] tcp_v6_rcv+0x31f1/0x3500 [ 73.523885][ C0] ? __kasan_check_read+0x11/0x20 [ 73.528893][ C0] ? mark_lock+0x98/0x11e0 [ 73.533330][ C0] ? tcp_v6_syn_recv_sock+0x2290/0x2290 [ 73.538872][ C0] ip6_protocol_deliver_rcu+0x2fe/0x1660 [ 73.544510][ C0] ip6_input_finish+0x84/0x170 [ 73.549258][ C0] ip6_input+0xe4/0x3f0 [ 73.553407][ C0] ? ip6_input_finish+0x170/0x170 [ 73.558429][ C0] ? ip6_protocol_deliver_rcu+0x1660/0x1660 [ 73.564323][ C0] ? lock_downgrade+0x920/0x920 [ 73.569172][ C0] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 73.575397][ C0] ip6_rcv_finish+0x1de/0x2f0 [ 73.580061][ C0] ipv6_rcv+0x10e/0x420 [ 73.584199][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 73.589652][ C0] ? __kasan_check_read+0x11/0x20 [ 73.594660][ C0] ? mark_lock+0xc0/0x11e0 [ 73.599064][ C0] ? ip6_rcv_finish_core.isra.0+0x560/0x560 [ 73.604956][ C0] ? ip6_rcv_core.isra.0+0x1bb0/0x1bb0 [ 73.610420][ C0] __netif_receive_skb_one_core+0x113/0x1a0 [ 73.616312][ C0] ? __netif_receive_skb_core+0x3060/0x3060 [ 73.622219][ C0] ? lock_acquire+0x190/0x410 [ 73.627063][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.633288][ C0] __netif_receive_skb+0x2c/0x1d0 [ 73.638301][ C0] process_backlog+0x206/0x750 [ 73.643052][ C0] ? net_rx_action+0x27b/0x10c0 [ 73.647911][ C0] ? lockdep_hardirqs_on+0x19e/0x5d0 [ 73.653192][ C0] net_rx_action+0x508/0x10c0 [ 73.657881][ C0] ? napi_complete_done+0x4b0/0x4b0 [ 73.663066][ C0] __do_softirq+0x262/0x98c [ 73.667559][ C0] ? inet_csk_listen_stop+0x1bc/0x850 [ 73.672913][ C0] do_softirq_own_stack+0x2a/0x40 [ 73.678020][ C0] [ 73.680942][ C0] do_softirq.part.0+0x11a/0x170 [ 73.685863][ C0] __local_bh_enable_ip+0x211/0x270 [ 73.691907][ C0] inet_csk_listen_stop+0x1e0/0x850 [ 73.705237][ C0] tcp_close+0xd5b/0x10e0 [ 73.709560][ C0] ? ip_mc_drop_socket+0x211/0x270 [ 73.714657][ C0] ? down_write+0xdf/0x150 [ 73.719285][ C0] inet_release+0xed/0x200 [ 73.723686][ C0] inet6_release+0x53/0x80 [ 73.728094][ C0] __sock_release+0xce/0x280 [ 73.732684][ C0] sock_close+0x1e/0x30 [ 73.736824][ C0] __fput+0x2ff/0x890 [ 73.740791][ C0] ? __sock_release+0x280/0x280 [ 73.745652][ C0] ____fput+0x16/0x20 [ 73.749639][ C0] task_work_run+0x145/0x1c0 [ 73.754215][ C0] exit_to_usermode_loop+0x316/0x380 [ 73.759489][ C0] do_syscall_64+0x65f/0x760 [ 73.764072][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.769953][ C0] RIP: 0033:0x406571 [ 73.773882][ 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 [ 73.793820][ C0] RSP: 002b:00007ffdff8ef780 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 73.802238][ C0] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000406571 [ 73.810208][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 73.818172][ C0] RBP: 00000000006dcc20 R08: 0000000000000140 R09: 0000000000000140 [ 73.826129][ C0] R10: 00007ffdff8ef7b0 R11: 0000000000000293 R12: 00007ffdff8ef7e0 [ 73.834105][ C0] R13: 00000000006dcc2c R14: 000000000000002d R15: 0000000000000007