[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.710379][ T23] audit: type=1800 audit(1575055560.001:25): pid=8746 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.730537][ T23] audit: type=1800 audit(1575055560.001:26): pid=8746 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.751295][ T23] audit: type=1800 audit(1575055560.011:27): pid=8746 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 '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.496281][ T8900] tipc: Started in network mode [ 75.501226][ T8900] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 75.511146][ T8900] check_preemption_disabled: 3 callbacks suppressed [ 75.511158][ T8900] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor387/8900 [ 75.527571][ T8900] caller is dst_cache_get+0x3d/0xb0 [ 75.532753][ T8900] CPU: 0 PID: 8900 Comm: syz-executor387 Not tainted 5.4.0-syzkaller #0 [ 75.541051][ T8900] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.551082][ T8900] Call Trace: [ 75.554354][ T8900] dump_stack+0x197/0x210 [ 75.558665][ T8900] debug_smp_processor_id.cold+0x87/0x97 [ 75.564278][ T8900] dst_cache_get+0x3d/0xb0 [ 75.568716][ T8900] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 75.573806][ T8900] ? lock_downgrade+0x920/0x920 [ 75.578639][ T8900] ? tipc_udp_addr2str+0x170/0x170 [ 75.583728][ T8900] ? __kasan_check_read+0x11/0x20 [ 75.588733][ T8900] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 75.594950][ T8900] ? tipc_crypto_xmit+0xb3e/0x2c70 [ 75.600043][ T8900] ? bearer_get+0x16e/0x350 [ 75.604528][ T8900] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 75.610669][ T8900] ? rcu_read_lock_held+0x9c/0xb0 [ 75.615670][ T8900] ? rcu_read_lock_held_common+0x130/0x130 [ 75.621456][ T8900] tipc_udp_send_msg+0x3ea/0x490 [ 75.626412][ T8900] tipc_bearer_xmit_skb+0x219/0x480 [ 75.631587][ T8900] ? tipc_bearer_mtu+0x4e0/0x4e0 [ 75.636504][ T8900] ? tipc_disc_create+0x71f/0xad0 [ 75.641528][ T8900] tipc_enable_bearer+0xb18/0xd90 [ 75.646534][ T8900] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 75.652409][ T8900] ? tipc_bearer_xmit_skb+0x480/0x480 [ 75.657760][ T8900] ? nla_memcpy+0xb0/0xb0 [ 75.662079][ T8900] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 75.667518][ T8900] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 75.673132][ T8900] ? tipc_nl_bearer_disable+0x40/0x40 [ 75.678480][ T8900] ? nla_memcpy+0xb0/0xb0 [ 75.682790][ T8900] ? __nla_parse+0x43/0x60 [ 75.687198][ T8900] tipc_nl_bearer_enable+0x23/0x40 [ 75.692298][ T8900] genl_rcv_msg+0x67d/0xea0 [ 75.696802][ T8900] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 75.703234][ T8900] ? __kasan_check_read+0x11/0x20 [ 75.708262][ T8900] ? __lock_acquire+0x8a0/0x4a00 [ 75.713184][ T8900] ? find_held_lock+0x35/0x130 [ 75.717929][ T8900] netlink_rcv_skb+0x177/0x450 [ 75.722688][ T8900] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 75.728996][ T8900] ? netlink_ack+0xb50/0xb50 [ 75.733563][ T8900] ? __kasan_check_write+0x14/0x20 [ 75.738652][ T8900] ? netlink_deliver_tap+0x24a/0xbe0 [ 75.743938][ T8900] genl_rcv+0x29/0x40 [ 75.747931][ T8900] netlink_unicast+0x58c/0x7d0 [ 75.752676][ T8900] ? netlink_attachskb+0x870/0x870 [ 75.757821][ T8900] ? _copy_from_iter_full+0x25d/0x8c0 [ 75.763231][ T8900] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 75.768946][ T8900] ? __check_object_size+0x3d/0x437 [ 75.774131][ T8900] netlink_sendmsg+0x8ee/0xe60 [ 75.778882][ T8900] ? netlink_unicast+0x7d0/0x7d0 [ 75.783802][ T8900] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 75.789330][ T8900] ? apparmor_socket_sendmsg+0x2a/0x30 [ 75.794768][ T8900] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.800984][ T8900] ? security_socket_sendmsg+0x8d/0xc0 [ 75.806419][ T8900] ? netlink_unicast+0x7d0/0x7d0 [ 75.811335][ T8900] sock_sendmsg+0xd7/0x130 [ 75.815744][ T8900] ____sys_sendmsg+0x753/0x880 [ 75.820488][ T8900] ? kernel_sendmsg+0x50/0x50 [ 75.825143][ T8900] ? debug_object_active_state+0x28a/0x350 [ 75.830928][ T8900] ___sys_sendmsg+0x11d/0x1b0 [ 75.835583][ T8900] ? do_recvmmsg+0x7a0/0x7a0 [ 75.840148][ T8900] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.845414][ T8900] ? __kasan_check_read+0x11/0x20 [ 75.850426][ T8900] ? mark_lock+0xc2/0x1220 [ 75.854818][ T8900] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 75.860604][ T8900] ? __kasan_check_read+0x11/0x20 [ 75.865608][ T8900] ? __lock_acquire+0x16f2/0x4a00 [ 75.870610][ T8900] ? debug_object_deactivate+0x320/0x320 [ 75.876223][ T8900] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 75.882384][ T8900] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.888627][ T8900] ? __fget_light+0x1a9/0x230 [ 75.893332][ T8900] ? __fdget+0x1b/0x20 [ 75.897387][ T8900] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 75.903635][ T8900] __sys_sendmsg+0x105/0x1d0 [ 75.908216][ T8900] ? __sys_sendmsg_sock+0x1f0/0x1f0 [ 75.913400][ T8900] ? lockdep_hardirqs_on+0x421/0x5e0 [ 75.918690][ T8900] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 75.924149][ T8900] ? do_syscall_64+0x26/0x790 [ 75.928829][ T8900] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.934896][ T8900] ? do_syscall_64+0x26/0x790 [ 75.939567][ T8900] __x64_sys_sendmsg+0x78/0xb0 [ 75.944334][ T8900] do_syscall_64+0xfa/0x790 [ 75.948838][ T8900] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.954732][ T8900] RIP: 0033:0x444359 [ 75.958624][ T8900] 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 [ 75.978224][ T8900] RSP: 002b:00007ffdc473dd38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 75.986632][ T8900] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444359 [ 75.994602][ T8900] RDX: 0000000000000000 R