[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.368602][ T26] audit: type=1800 audit(1574806990.272:25): pid=8668 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.409347][ T26] audit: type=1800 audit(1574806990.282:26): pid=8668 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.451271][ T26] audit: type=1800 audit(1574806990.282:27): pid=8668 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 '10.128.0.7' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.082639][ T8821] tipc: Started in network mode [ 68.087621][ T8821] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 68.097825][ T8821] tipc: New replicast peer: fe80:0000:0000:0000:dd00:0000:0000:00bb [ 68.106342][ T8821] check_preemption_disabled: 3 callbacks suppressed [ 68.106353][ T8821] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor666/8821 [ 68.122756][ T8821] caller is dst_cache_get+0x3d/0xb0 [ 68.128137][ T8821] CPU: 0 PID: 8821 Comm: syz-executor666 Not tainted 5.4.0-rc8-syzkaller #0 [ 68.136819][ T8821] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.146858][ T8821] Call Trace: [ 68.150311][ T8821] dump_stack+0x197/0x210 [ 68.154622][ T8821] debug_smp_processor_id.cold+0x87/0x9d [ 68.160244][ T8821] dst_cache_get+0x3d/0xb0 [ 68.164642][ T8821] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 68.169751][ T8821] ? kasan_kmalloc+0x9/0x10 [ 68.174242][ T8821] ? tipc_udp_addr2str+0x170/0x170 [ 68.179331][ T8821] ? __copy_skb_header+0x2e8/0x560 [ 68.184420][ T8821] ? skb_ts_finish+0xb0/0xb0 [ 68.188988][ T8821] ? __kmalloc_reserve.isra.0+0xf0/0xf0 [ 68.194515][ T8821] ? skb_copy_header+0x21/0x2b0 [ 68.199346][ T8821] ? __pskb_copy_fclone+0x516/0xc90 [ 68.204535][ T8821] ? rcu_read_lock_held+0x9c/0xb0 [ 68.209551][ T8821] ? rcu_read_lock_held_common+0x130/0x130 [ 68.215496][ T8821] tipc_udp_send_msg+0x29a/0x490 [ 68.220449][ T8821] tipc_bearer_xmit_skb+0x17e/0x370 [ 68.225644][ T8821] tipc_enable_bearer+0xacf/0xd30 [ 68.230677][ T8821] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 68.236561][ T8821] ? tipc_bearer_xmit_skb+0x370/0x370 [ 68.241942][ T8821] ? nla_memcpy+0xb0/0xb0 [ 68.246265][ T8821] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 68.251727][ T8821] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 68.257388][ T8821] ? tipc_nl_bearer_disable+0x40/0x40 [ 68.262793][ T8821] ? nla_memcpy+0xb0/0xb0 [ 68.267180][ T8821] ? lock_acquire+0x190/0x410 [ 68.271884][ T8821] tipc_nl_bearer_enable+0x23/0x40 [ 68.276980][ T8821] genl_family_rcv_msg+0x74b/0xf90 [ 68.282093][ T8821] ? genl_unregister_family+0x7c0/0x7c0 [ 68.287617][ T8821] ? __kasan_check_read+0x11/0x20 [ 68.292704][ T8821] ? __lock_acquire+0x16f2/0x4a00 [ 68.297756][ T8821] genl_rcv_msg+0xca/0x170 [ 68.302194][ T8821] netlink_rcv_skb+0x177/0x450 [ 68.306942][ T8821] ? genl_family_rcv_msg+0xf90/0xf90 [ 68.312214][ T8821] ? netlink_ack+0xb50/0xb50 [ 68.316783][ T8821] ? __kasan_check_write+0x14/0x20 [ 68.322316][ T8821] ? netlink_deliver_tap+0x254/0xbf0 [ 68.327589][ T8821] genl_rcv+0x29/0x40 [ 68.331562][ T8821] netlink_unicast+0x531/0x710 [ 68.336852][ T8821] ? netlink_attachskb+0x7c0/0x7c0 [ 68.341947][ T8821] ? _copy_from_iter_full+0x25d/0x8c0 [ 68.347315][ T8821] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 68.353031][ T8821] ? __check_object_size+0x3d/0x437 [ 68.358210][ T8821] netlink_sendmsg+0x8a5/0xd60 [ 68.362962][ T8821] ? netlink_unicast+0x710/0x710 [ 68.367884][ T8821] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 68.373418][ T8821] ? apparmor_socket_sendmsg+0x2a/0x30 [ 68.378872][ T8821] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.385092][ T8821] ? security_socket_sendmsg+0x8d/0xc0 [ 68.390546][ T8821] ? netlink_unicast+0x710/0x710 [ 68.395462][ T8821] sock_sendmsg+0xd7/0x130 [ 68.399878][ T8821] ___sys_sendmsg+0x803/0x920 [ 68.404579][ T8821] ? copy_msghdr_from_user+0x440/0x440 [ 68.410032][ T8821] ? lock_downgrade+0x920/0x920 [ 68.414876][ T8821] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 68.420691][ T8821] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.426033][ T8821] ? __kasan_check_read+0x11/0x20 [ 68.431053][ T8821] ? mark_lock+0xc2/0x1220 [ 68.435459][ T8821] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 68.441262][ T8821] ? __kasan_check_read+0x11/0x20 [ 68.446275][ T8821] ? __lock_acquire+0x16f2/0x4a00 [ 68.451297][ T8821] ? debug_object_deactivate+0x320/0x320 [ 68.456943][ T8821] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 68.463089][ T8821] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 68.469318][ T8821] ? __fget_light+0x1a9/0x230 [ 68.474032][ T8821] ? __fdget+0x1b/0x20 [ 68.478120][ T8821] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.484353][ T8821] __sys_sendmsg+0x105/0x1d0 [ 68.488924][ T8821] ? __sys_sendmsg_sock+0xd0/0xd0 [ 68.493983][ T8821] ? lockdep_hardirqs_on+0x421/0x5e0 [ 68.499276][ T8821] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 68.504739][ T8821] ? do_syscall_64+0x26/0x760 [ 68.509400][ T8821] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.515626][ T8821] ? do_syscall_64+0x26/0x760 [ 68.520288][ T8821] __x64_sys_sendmsg+0x78/0xb0 [ 68.525038][ T8821] do_syscall_64+0xfa/0x760 [ 68.529541][ T8821] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.535418][ T8821] RIP: 0033:0x4441f9 [ 68.539315][ T8821] 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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.559007][ T8821] RSP: 002b:00007ffc37593af8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 68.567413][ T8821] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004441f9 [ 68.575376][ T8821] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 68.583328][ T88