[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.921294][ T26] audit: type=1800 audit(1574824081.787:25): pid=8667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.965148][ T26] audit: type=1800 audit(1574824081.797:26): pid=8667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.005549][ T26] audit: type=1800 audit(1574824081.797:27): pid=8667 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 '10.128.10.30' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 71.770737][ T8820] tipc: Started in network mode [ 71.775767][ T8820] tipc: Own node identity ff000000000000000000000000000001, cluster identity 4711 [ 71.785550][ T8820] tipc: New replicast peer: fe80:0000:0000:0000:dd00:0000:0000:00bb [ 71.793867][ T8820] check_preemption_disabled: 3 callbacks suppressed [ 71.793878][ T8820] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor923/8820 [ 71.810216][ T8820] caller is dst_cache_get+0x3d/0xb0 [ 71.815448][ T8820] CPU: 1 PID: 8820 Comm: syz-executor923 Not tainted 5.4.0-syzkaller #0 [ 71.823756][ T8820] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.833791][ T8820] Call Trace: [ 71.837064][ T8820] dump_stack+0x197/0x210 [ 71.841817][ T8820] debug_smp_processor_id.cold+0x87/0x9d [ 71.847513][ T8820] dst_cache_get+0x3d/0xb0 [ 71.851907][ T8820] tipc_udp_xmit.isra.0+0xc4/0xb80 [ 71.857007][ T8820] ? kasan_kmalloc+0x9/0x10 [ 71.861487][ T8820] ? tipc_udp_addr2str+0x170/0x170 [ 71.866747][ T8820] ? __copy_skb_header+0x2e8/0x560 [ 71.871834][ T8820] ? skb_ts_finish+0xb0/0xb0 [ 71.876404][ T8820] ? __kmalloc_reserve.isra.0+0xf0/0xf0 [ 71.881930][ T8820] ? skb_copy_header+0x21/0x2b0 [ 71.886762][ T8820] ? __pskb_copy_fclone+0x516/0xc90 [ 71.891937][ T8820] ? rcu_read_lock_held+0x9c/0xb0 [ 71.896953][ T8820] ? rcu_read_lock_held_common+0x130/0x130 [ 71.902746][ T8820] tipc_udp_send_msg+0x29a/0x490 [ 71.907671][ T8820] tipc_bearer_xmit_skb+0x219/0x480 [ 71.912860][ T8820] ? tipc_bearer_mtu+0x4f0/0x4f0 [ 71.917798][ T8820] ? tipc_disc_create+0x729/0xae0 [ 71.922808][ T8820] tipc_enable_bearer+0xb1d/0xd90 [ 71.927991][ T8820] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 71.933868][ T8820] ? tipc_bearer_xmit_skb+0x480/0x480 [ 71.939225][ T8820] ? nla_memcpy+0xb0/0xb0 [ 71.943739][ T8820] __tipc_nl_bearer_enable+0x2de/0x3a0 [ 71.949180][ T8820] ? __tipc_nl_bearer_enable+0x2de/0x3a0 [ 71.954789][ T8820] ? tipc_nl_bearer_disable+0x40/0x40 [ 71.960159][ T8820] ? nla_memcpy+0xb0/0xb0 [ 71.964468][ T8820] ? stack_depot_save+0x25a/0x450 [ 71.969470][ T8820] ? __nla_parse+0x43/0x60 [ 71.973867][ T8820] tipc_nl_bearer_enable+0x23/0x40 [ 71.978956][ T8820] genl_rcv_msg+0x67d/0xea0 [ 71.983443][ T8820] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 71.989757][ T8820] ? __kasan_check_read+0x11/0x20 [ 71.995631][ T8820] ? __lock_acquire+0x8a0/0x4a00 [ 72.000549][ T8820] ? find_held_lock+0x35/0x130 [ 72.005492][ T8820] netlink_rcv_skb+0x177/0x450 [ 72.010314][ T8820] ? genl_family_rcv_msg_attrs_parse+0x300/0x300 [ 72.016645][ T8820] ? netlink_ack+0xb50/0xb50 [ 72.021223][ T8820] ? __kasan_check_write+0x14/0x20 [ 72.026329][ T8820] ? netlink_deliver_tap+0x254/0xbf0 [ 72.031608][ T8820] genl_rcv+0x29/0x40 [ 72.035571][ T8820] netlink_unicast+0x531/0x710 [ 72.040341][ T8820] ? netlink_attachskb+0x7c0/0x7c0 [ 72.045433][ T8820] ? _copy_from_iter_full+0x25d/0x8c0 [ 72.050791][ T8820] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 72.056489][ T8820] ? __check_object_size+0x3d/0x437 [ 72.061673][ T8820] netlink_sendmsg+0x8a5/0xd60 [ 72.066480][ T8820] ? netlink_unicast+0x710/0x710 [ 72.071397][ T8820] ? aa_sock_msg_perm.isra.0+0xba/0x170 [ 72.076937][ T8820] ? apparmor_socket_sendmsg+0x2a/0x30 [ 72.082392][ T8820] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.088607][ T8820] ? security_socket_sendmsg+0x8d/0xc0 [ 72.094391][ T8820] ? netlink_unicast+0x710/0x710 [ 72.099308][ T8820] sock_sendmsg+0xd7/0x130 [ 72.103711][ T8820] ___sys_sendmsg+0x803/0x920 [ 72.108376][ T8820] ? copy_msghdr_from_user+0x440/0x440 [ 72.114040][ T8820] ? lock_downgrade+0x920/0x920 [ 72.118869][ T8820] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 72.124650][ T8820] ? lockdep_hardirqs_on+0x421/0x5e0 [ 72.129919][ T8820] ? __kasan_check_read+0x11/0x20 [ 72.134925][ T8820] ? mark_lock+0xc2/0x1220 [ 72.139324][ T8820] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 72.145117][ T8820] ? __kasan_check_read+0x11/0x20 [ 72.150115][ T8820] ? __lock_acquire+0x16f2/0x4a00 [ 72.155126][ T8820] ? debug_object_deactivate+0x320/0x320 [ 72.160739][ T8820] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 72.166882][ T8820] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.173100][ T8820] ? __fget_light+0x1a9/0x230 [ 72.177762][ T8820] ? __fdget+0x1b/0x20 [ 72.181807][ T8820] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 72.188044][ T8820] __sys_sendmsg+0x105/0x1d0 [ 72.192623][ T8820] ? __sys_sendmsg_sock+0xd0/0xd0 [ 72.197624][ T8820] ? lockdep_hardirqs_on+0x421/0x5e0 [ 72.202889][ T8820] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 72.208333][ T8820] ? do_fast_syscall_32+0xd1/0xdb3 [ 72.213421][ T8820] ? entry_SYSENTER_compat+0x70/0x7f [ 72.218701][ T8820] ? do_fast_syscall_32+0xd1/0xdb3 [ 72.223791][ T8820] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 72.229486][ T8820] do_fast_syscall_32+0x27b/0xdb3 [ 72.234576][ T8820] entry_SYSENTER_compat+0x70/0x7f [ 72.239676][ T8820] RIP: 0023:0xf7fd1a39 [ 72.243721][ T8820] 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 [ 72.263323][ T8820] RSP: 002b:00000000ff9fc22c EFLAGS: 00000246 ORIG_RAX: 0000000000000172 [ 72.2720