[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 73.281718][ T26] audit: type=1800 audit(1575111549.505:25): pid=8873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 73.302065][ T26] audit: type=1800 audit(1575111549.515:26): pid=8873 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 73.340394][ T26] audit: type=1800 audit(1575111549.515:27): pid=8873 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 '10.128.0.101' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 84.969020][ T9025] tipc: Started in network mode [ 84.974683][ T9025] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 84.986156][ T9025] check_preemption_disabled: 3 callbacks suppressed [ 84.986167][ T9025] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor707/9025 [ 85.005814][ T9025] caller is dst_cache_get+0x3d/0xb0 [ 85.011325][ T9025] CPU: 1 PID: 9025 Comm: syz-executor707 Not tainted 5.4.0-syzkaller #0 [ 85.020477][ T9025] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.032668][ T9025] Call Trace: [ 85.038054][ T9025] dump_stack+0x197/0x210 [ 85.042609][ T9025] debug_smp_processor_id.cold+0x87/0x97 [ 85.049221][ T9025] dst_cache_get+0x3d/0xb0 [ 85.053731][ T9025] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 85.059500][ T9025] ? lock_downgrade+0x920/0x920 [ 85.065139][ T9025] ? tipc_udp_addr2str+0x170/0x170 [ 85.070430][ T9025] ? __kasan_check_read+0x11/0x20 [ 85.075914][ T9025] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 85.082519][ T9025] ? tipc_crypto_xmit+0xb3e/0x2c70 [ 85.089007][ T9025] ? bearer_get+0x16e/0x350 [ 85.093558][ T9025] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 85.100108][ T9025] ? rcu_read_lock_held+0x9c/0xb0 [ 85.105611][ T9025] ? rcu_read_lock_held_common+0x130/0x130 [ 85.111425][ T9025] tipc_udp_send_msg+0x3ea/0x490 [ 85.117766][ T9025] tipc_bearer_xmit_skb+0x219/0x480 [ 85.124219][ T9025] ? tipc_bearer_mtu+0x4e0/0x4e0 [ 85.129495][ T9025] ? tipc_disc_create+0x71f/0xad0 [ 85.135337][ T9025] tipc_enable_bearer+0xb18/0xd90 [ 85.141340][ T9025] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 85.147818][ T9025] ? tipc_bearer_xmit_skb+0x480/0x480 [ 85.154157][ T9025] ? nla_memcpy+0xb0/0xb0 [ 85.159136][ T9025] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 85.165125][ T9025] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 85.171629][ T9025] ? tipc_nl_bearer_disable+0x40/0x40 [ 85.177235][ T9025] ? nla_memcpy+0xb0/0xb0 [ 85.181890][ T9025] ? stack_depot_save+0x25a/0x450 [ 85.187112][ T9025] ? __nla_parse+0x43/0x60 [ 85.192619][ T9025] tipc_nl_bearer_enable+0x23/0x40 [ 85.197818][ T9025] genl_rcv_msg+0x67d/0xea0 [ 85.203081][ T9025] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 85.210005][ T9025] ? __kasan_check_read+0x11/0x20 [ 85.215700][ T9025] ? __lock_acquire+0x8a0/0x4a00 [ 85.220649][ T9025] ? find_held_lock+0x35/0x130 [ 85.225808][ T9025] netlink_rcv_skb+0x177/0x450 [ 85.231119][ T9025] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 85.238151][ T9025] ? netlink_ack+0xb50/0xb50 [ 85.243272][ T9025] ? __kasan_check_write+0x14/0x20 [ 85.248701][ T9025] ? netlink_deliver_tap+0x24a/0xbe0 [ 85.254200][ T9025] genl_rcv+0x29/0x40 [ 85.258610][ T9025] netlink_unicast+0x58c/0x7d0 [ 85.263893][ T9025] ? netlink_attachskb+0x870/0x870 [ 85.269178][ T9025] ? _copy_from_iter_full+0x25d/0x8c0 [ 85.275241][ T9025] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 85.281458][ T9025] ? __check_object_size+0x3d/0x437 [ 85.287238][ T9025] netlink_sendmsg+0x8ee/0xe60 [ 85.292591][ T9025] ? netlink_unicast+0x7d0/0x7d0 [ 85.298355][ T9025] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 85.304240][ T9025] ? apparmor_socket_sendmsg+0x2a/0x30 [ 85.310994][ T9025] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.317740][ T9025] ? security_socket_sendmsg+0x8d/0xc0 [ 85.323820][ T9025] ? netlink_unicast+0x7d0/0x7d0 [ 85.329369][ T9025] sock_sendmsg+0xd7/0x130 [ 85.334345][ T9025] ____sys_sendmsg+0x753/0x880 [ 85.339618][ T9025] ? kernel_sendmsg+0x50/0x50 [ 85.344569][ T9025] ? compat_mc_getsockopt+0xe40/0xe40 [ 85.349972][ T9025] ? debug_object_active_state+0x28a/0x350 [ 85.355880][ T9025] ___sys_sendmsg+0x11d/0x1b0 [ 85.361518][ T9025] ? do_recvmmsg+0x7a0/0x7a0 [ 85.366497][ T9025] ? lockdep_hardirqs_on+0x421/0x5e0 [ 85.371820][ T9025] ? __kasan_check_read+0x11/0x20 [ 85.377316][ T9025] ? mark_lock+0xc2/0x1220 [ 85.381764][ T9025] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 85.387835][ T9025] ? __kasan_check_read+0x11/0x20 [ 85.393117][ T9025] ? __lock_acquire+0x16f2/0x4a00 [ 85.398904][ T9025] ? debug_object_deactivate+0x320/0x320 [ 85.405741][ T9025] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 85.413032][ T9025] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 85.422177][ T9025] ? __fget_light+0x1a9/0x230 [ 85.427162][ T9025] ? __fdget+0x1b/0x20 [ 85.431493][ T9025] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 85.438304][ T9025] __sys_sendmsg+0x105/0x1d0 [ 85.443258][ T9025] ? __sys_sendmsg_sock+0x1f0/0x1f0 [ 85.448788][ T9025] ? lockdep_hardirqs_on+0x421/0x5e0 [ 85.454425][ T9025] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 85.460615][ T9025] ? do_fast_syscall_32+0xd1/0xe16 [ 85.465828][ T9025] ? entry_SYSENTER_compat+0x70/0x7f [ 85.471251][ T9025] ? do_fast_syscall_32+0xd1/0xe16 [ 85.477113][ T9025] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 85.483144][ T9025] do_fast_syscall_32+0x27b/0xe16 [ 85.488690][ T9025] entry_SYSENTER_compat+0x70/0x7f [ 85.493800][ T9025] RIP: 0023:0xf7f8da39 [ 85.497989][ T9025] Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 85.518382][ T9025] RSP: 002b:00000000ffee493c EFLAGS: 00000246 ORIG_RAX: 0000000000000172 [ 85.527645][ T9025] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000000 [ 85.536345][ T9025] RDX: 0000000000000000 RSI: 00000000080ef080 RDI: 00000000ffee4990 [ 85.544572][ T9025] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 85.552630][ T9025] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 85.561686][ T9025] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [