[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.361967][ T25] audit: type=1800 audit(1575059219.329:25): pid=8778 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.382616][ T25] audit: type=1800 audit(1575059219.339:26): pid=8778 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.435240][ T25] audit: type=1800 audit(1575059219.339:27): pid=8778 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 '10.128.0.243' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 71.330696][ T8932] tipc: Started in network mode [ 71.335710][ T8932] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 71.345741][ T8932] check_preemption_disabled: 3 callbacks suppressed [ 71.345752][ T8932] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor521/8932 [ 71.362016][ T8932] caller is dst_cache_get+0x3d/0xb0 [ 71.367261][ T8932] CPU: 0 PID: 8932 Comm: syz-executor521 Not tainted 5.4.0-syzkaller #0 [ 71.375585][ T8932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.385618][ T8932] Call Trace: [ 71.388892][ T8932] dump_stack+0x197/0x210 [ 71.393204][ T8932] debug_smp_processor_id.cold+0x87/0x97 [ 71.398819][ T8932] dst_cache_get+0x3d/0xb0 [ 71.403237][ T8932] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 71.408326][ T8932] ? lock_downgrade+0x920/0x920 [ 71.413155][ T8932] ? tipc_udp_addr2str+0x170/0x170 [ 71.418334][ T8932] ? __kasan_check_read+0x11/0x20 [ 71.423357][ T8932] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 71.429584][ T8932] ? tipc_crypto_xmit+0xb3e/0x2c70 [ 71.434726][ T8932] ? bearer_get+0x16e/0x350 [ 71.439214][ T8932] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 71.445390][ T8932] ? rcu_read_lock_held+0x9c/0xb0 [ 71.450410][ T8932] ? rcu_read_lock_held_common+0x130/0x130 [ 71.456203][ T8932] tipc_udp_send_msg+0x3ea/0x490 [ 71.461132][ T8932] tipc_bearer_xmit_skb+0x219/0x480 [ 71.466311][ T8932] ? tipc_bearer_mtu+0x4e0/0x4e0 [ 71.471225][ T8932] ? tipc_disc_create+0x71f/0xad0 [ 71.476243][ T8932] tipc_enable_bearer+0xb18/0xd90 [ 71.481251][ T8932] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 71.487131][ T8932] ? tipc_bearer_xmit_skb+0x480/0x480 [ 71.492482][ T8932] ? nla_memcpy+0xb0/0xb0 [ 71.498709][ T8932] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 71.504177][ T8932] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 71.509788][ T8932] ? tipc_nl_bearer_disable+0x40/0x40 [ 71.515137][ T8932] ? nla_memcpy+0xb0/0xb0 [ 71.519445][ T8932] ? __nla_parse+0x43/0x60 [ 71.523849][ T8932] tipc_nl_bearer_enable+0x23/0x40 [ 71.528953][ T8932] genl_rcv_msg+0x67d/0xea0 [ 71.533439][ T8932] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 71.539747][ T8932] ? __kasan_check_read+0x11/0x20 [ 71.544753][ T8932] ? __lock_acquire+0x8a0/0x4a00 [ 71.549691][ T8932] ? find_held_lock+0x35/0x130 [ 71.554451][ T8932] netlink_rcv_skb+0x177/0x450 [ 71.559204][ T8932] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 71.565614][ T8932] ? netlink_ack+0xb50/0xb50 [ 71.570184][ T8932] ? __kasan_check_write+0x14/0x20 [ 71.575280][ T8932] ? netlink_deliver_tap+0x24a/0xbe0 [ 71.580561][ T8932] genl_rcv+0x29/0x40 [ 71.584523][ T8932] netlink_unicast+0x58c/0x7d0 [ 71.589287][ T8932] ? netlink_attachskb+0x870/0x870 [ 71.594390][ T8932] ? _copy_from_iter_full+0x25d/0x8c0 [ 71.601137][ T8932] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 71.606835][ T8932] ? __check_object_size+0x3d/0x437 [ 71.612012][ T8932] netlink_sendmsg+0x8ee/0xe60 [ 71.616757][ T8932] ? netlink_unicast+0x7d0/0x7d0 [ 71.621672][ T8932] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 71.627207][ T8932] ? apparmor_socket_sendmsg+0x2a/0x30 [ 71.632643][ T8932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.638863][ T8932] ? security_socket_sendmsg+0x8d/0xc0 [ 71.644307][ T8932] ? netlink_unicast+0x7d0/0x7d0 [ 71.649223][ T8932] sock_sendmsg+0xd7/0x130 [ 71.653624][ T8932] ____sys_sendmsg+0x753/0x880 [ 71.658368][ T8932] ? kernel_sendmsg+0x50/0x50 [ 71.663023][ T8932] ? debug_object_active_state+0x28a/0x350 [ 71.668807][ T8932] ___sys_sendmsg+0x11d/0x1b0 [ 71.673462][ T8932] ? do_recvmmsg+0x7a0/0x7a0 [ 71.678028][ T8932] ? lockdep_hardirqs_on+0x421/0x5e0 [ 71.683294][ T8932] ? __kasan_check_read+0x11/0x20 [ 71.688308][ T8932] ? mark_lock+0xc2/0x1220 [ 71.692701][ T8932] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 71.698487][ T8932] ? __kasan_check_read+0x11/0x20 [ 71.703489][ T8932] ? __lock_acquire+0x16f2/0x4a00 [ 71.708498][ T8932] ? debug_object_deactivate+0x320/0x320 [ 71.714105][ T8932] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 71.720239][ T8932] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 71.726471][ T8932] ? __fget_light+0x1a9/0x230 [ 71.731122][ T8932] ? __fdget+0x1b/0x20 [ 71.735168][ T8932] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 71.741404][ T8932] __sys_sendmsg+0x105/0x1d0 [ 71.745987][ T8932] ? __sys_sendmsg_sock+0x1f0/0x1f0 [ 71.751158][ T8932] ? lockdep_hardirqs_on+0x421/0x5e0 [ 71.756424][ T8932] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 71.761873][ T8932] ? do_syscall_64+0x26/0x790 [ 71.766530][ T8932] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 71.772573][ T8932] ? do_syscall_64+0x26/0x790 [ 71.777233][ T8932] __x64_sys_sendmsg+0x78/0xb0 [ 71.781979][ T8932] do_syscall_64+0xfa/0x790 [ 71.786463][ T8932] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 71.792341][ T8932] RIP: 0033:0x444359 [ 71.796216][ T8932] 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 [ 71.815812][ T8932] RSP: 002b:00007ffdcf5e5688 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 71.824210][ T8932] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444359 [ 71.83