[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.426858][ T25] audit: type=1800 audit(1575055387.426:25): pid=8767 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.446648][ T25] audit: type=1800 audit(1575055387.436:26): pid=8767 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.513549][ T25] audit: type=1800 audit(1575055387.436:27): pid=8767 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 '10.128.0.134' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.655390][ T8923] tipc: Started in network mode [ 69.660391][ T8923] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 69.670289][ T8923] check_preemption_disabled: 3 callbacks suppressed [ 69.670300][ T8923] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor570/8923 [ 69.686565][ T8923] caller is dst_cache_get+0x3d/0xb0 [ 69.691914][ T8923] CPU: 0 PID: 8923 Comm: syz-executor570 Not tainted 5.4.0-syzkaller #0 [ 69.700297][ T8923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.710376][ T8923] Call Trace: [ 69.713651][ T8923] dump_stack+0x197/0x210 [ 69.718100][ T8923] debug_smp_processor_id.cold+0x87/0x97 [ 69.723718][ T8923] dst_cache_get+0x3d/0xb0 [ 69.728130][ T8923] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 69.733217][ T8923] ? lock_downgrade+0x920/0x920 [ 69.738050][ T8923] ? tipc_udp_addr2str+0x170/0x170 [ 69.743141][ T8923] ? __kasan_check_read+0x11/0x20 [ 69.748145][ T8923] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 69.754361][ T8923] ? tipc_crypto_xmit+0xb3e/0x2c70 [ 69.759451][ T8923] ? bearer_get+0x16e/0x350 [ 69.763933][ T8923] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 69.770075][ T8923] ? rcu_read_lock_held+0x9c/0xb0 [ 69.775084][ T8923] ? rcu_read_lock_held_common+0x130/0x130 [ 69.780871][ T8923] tipc_udp_send_msg+0x3ea/0x490 [ 69.785803][ T8923] tipc_bearer_xmit_skb+0x219/0x480 [ 69.790976][ T8923] ? tipc_bearer_mtu+0x4e0/0x4e0 [ 69.795894][ T8923] ? tipc_disc_create+0x71f/0xad0 [ 69.800899][ T8923] tipc_enable_bearer+0xb18/0xd90 [ 69.805901][ T8923] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 69.811775][ T8923] ? tipc_bearer_xmit_skb+0x480/0x480 [ 69.817138][ T8923] ? nla_memcpy+0xb0/0xb0 [ 69.821459][ T8923] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 69.826892][ T8923] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 69.832501][ T8923] ? tipc_nl_bearer_disable+0x40/0x40 [ 69.837844][ T8923] ? nla_memcpy+0xb0/0xb0 [ 69.842153][ T8923] ? __nla_parse+0x43/0x60 [ 69.846552][ T8923] tipc_nl_bearer_enable+0x23/0x40 [ 69.851643][ T8923] genl_rcv_msg+0x67d/0xea0 [ 69.856130][ T8923] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 69.862433][ T8923] ? __kasan_check_read+0x11/0x20 [ 69.867436][ T8923] ? __lock_acquire+0x8a0/0x4a00 [ 69.872356][ T8923] ? find_held_lock+0x35/0x130 [ 69.877102][ T8923] netlink_rcv_skb+0x177/0x450 [ 69.881848][ T8923] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 69.888148][ T8923] ? netlink_ack+0xb50/0xb50 [ 69.892718][ T8923] ? __kasan_check_write+0x14/0x20 [ 69.897818][ T8923] ? netlink_deliver_tap+0x24a/0xbe0 [ 69.903083][ T8923] genl_rcv+0x29/0x40 [ 69.907039][ T8923] netlink_unicast+0x58c/0x7d0 [ 69.911797][ T8923] ? netlink_attachskb+0x870/0x870 [ 69.916886][ T8923] ? _copy_from_iter_full+0x25d/0x8c0 [ 69.922235][ T8923] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 69.927941][ T8923] ? __check_object_size+0x3d/0x437 [ 69.933117][ T8923] netlink_sendmsg+0x8ee/0xe60 [ 69.937874][ T8923] ? netlink_unicast+0x7d0/0x7d0 [ 69.942787][ T8923] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 69.948321][ T8923] ? apparmor_socket_sendmsg+0x2a/0x30 [ 69.953770][ T8923] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 69.959993][ T8923] ? security_socket_sendmsg+0x8d/0xc0 [ 69.965440][ T8923] ? netlink_unicast+0x7d0/0x7d0 [ 69.970355][ T8923] sock_sendmsg+0xd7/0x130 [ 69.974745][ T8923] ____sys_sendmsg+0x753/0x880 [ 69.979486][ T8923] ? kernel_sendmsg+0x50/0x50 [ 69.984159][ T8923] ? debug_object_active_state+0x28a/0x350 [ 69.989943][ T8923] ___sys_sendmsg+0x11d/0x1b0 [ 69.994595][ T8923] ? do_recvmmsg+0x7a0/0x7a0 [ 69.999173][ T8923] ? lockdep_hardirqs_on+0x421/0x5e0 [ 70.004438][ T8923] ? __kasan_check_read+0x11/0x20 [ 70.009437][ T8923] ? mark_lock+0xc2/0x1220 [ 70.013830][ T8923] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 70.019627][ T8923] ? __kasan_check_read+0x11/0x20 [ 70.024626][ T8923] ? __lock_acquire+0x16f2/0x4a00 [ 70.029635][ T8923] ? debug_object_deactivate+0x320/0x320 [ 70.035255][ T8923] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 70.041391][ T8923] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 70.047618][ T8923] ? __fget_light+0x1a9/0x230 [ 70.052272][ T8923] ? __fdget+0x1b/0x20 [ 70.056324][ T8923] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 70.062543][ T8923] __sys_sendmsg+0x105/0x1d0 [ 70.067109][ T8923] ? __sys_sendmsg_sock+0x1f0/0x1f0 [ 70.072282][ T8923] ? lockdep_hardirqs_on+0x421/0x5e0 [ 70.077548][ T8923] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 70.082985][ T8923] ? do_syscall_64+0x26/0x790 [ 70.087639][ T8923] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.093679][ T8923] ? do_syscall_64+0x26/0x790 [ 70.098335][ T8923] __x64_sys_sendmsg+0x78/0xb0 [ 70.103092][ T8923] do_syscall_64+0xfa/0x790 [ 70.107579][ T8923] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.113447][ T8923] RIP: 0033:0x444359 [ 70.117320][ T8923] 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 [ 70.137173][ T8923] RSP: 002b:00007ffebdfe9ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 70.145568][ T8923] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444359 [ 70.153540][ T8923] RDX: 0000000000000000 RSI: