[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 28.669889] kauditd_printk_skb: 7 callbacks suppressed [ 28.669901] audit: type=1800 audit(1542312862.394:29): pid=5872 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 28.696511] audit: type=1800 audit(1542312862.394:30): pid=5872 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.124' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.877557] netlink: 'syz-executor993': attribute type 3 has an invalid length. [ 38.885097] netlink: 'syz-executor993': attribute type 2 has an invalid length. [ 38.893161] WARNING: CPU: 0 PID: 6028 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 38.903720] Kernel panic - not syncing: panic_on_warn set ... [ 38.909595] CPU: 0 PID: 6028 Comm: syz-executor993 Not tainted 4.20.0-rc2+ #297 [ 38.917021] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.926370] Call Trace: [ 38.928949] dump_stack+0x244/0x39d [ 38.932563] ? dump_stack_print_info.cold.1+0x20/0x20 [ 38.937746] panic+0x2ad/0x55c [ 38.940921] ? add_taint.cold.5+0x16/0x16 [ 38.945057] ? __warn.cold.8+0x5/0x45 [ 38.948845] ? __warn+0xe8/0x1d0 [ 38.952197] ? cttimeout_default_get+0x1df/0xb30 [ 38.956970] __warn.cold.8+0x20/0x45 [ 38.960667] ? rcu_softirq_qs+0x20/0x20 [ 38.964625] ? cttimeout_default_get+0x1df/0xb30 [ 38.969368] report_bug+0x254/0x2d0 [ 38.972983] do_error_trap+0x11b/0x200 [ 38.976855] do_invalid_op+0x36/0x40 [ 38.980552] ? cttimeout_default_get+0x1df/0xb30 [ 38.985289] invalid_op+0x14/0x20 [ 38.988756] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 38.994102] Code: 00 0f 87 8d 00 00 00 41 80 ff 06 0f 84 94 07 00 00 41 80 ff 11 0f 84 6c 07 00 00 41 80 ff 01 0f 84 44 07 00 00 e8 f1 55 20 fb <0f> 0b 41 bd a1 ff ff ff eb 06 41 bd a1 ff ff ff e8 dc 55 20 fb 48 [ 39.012991] RSP: 0018:ffff8881c20ef2b0 EFLAGS: 00010293 [ 39.018338] RAX: ffff8881c2382100 RBX: ffffffff88bf5f60 RCX: ffffffff865f31bc [ 39.025588] RDX: 0000000000000000 RSI: ffffffff865f31ef RDI: 0000000000000001 [ 39.032840] RBP: ffff8881c20ef3c0 R08: ffff8881c2382100 R09: ffffed103b5c5b67 [ 39.040092] R10: 0000000000000002 R11: ffff8881dae2db3b R12: 0000000000000088 [ 39.047343] R13: ffff8881c5f19d00 R14: 0000000000000017 R15: 0000000000000088 [ 39.054619] ? cttimeout_default_get+0x1ac/0xb30 [ 39.059364] ? cttimeout_default_get+0x1df/0xb30 [ 39.064109] ? lock_downgrade+0x900/0x900 [ 39.068250] ? check_preemption_disabled+0x48/0x280 [ 39.073251] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 39.077995] ? __lock_is_held+0xb5/0x140 [ 39.082043] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 39.086803] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 39.091152] ? nfnetlink_bind+0x3b0/0x3b0 [ 39.095298] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.100821] ? refcount_sub_and_test_checked+0x203/0x310 [ 39.106263] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 39.111766] ? netlink_deliver_tap+0x32e/0xf80 [ 39.116378] ? lock_downgrade+0x900/0x900 [ 39.120519] ? check_preemption_disabled+0x48/0x280 [ 39.125539] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 39.131073] ? apparmor_capable+0x355/0x6c0 [ 39.135390] ? rcu_softirq_qs+0x20/0x20 [ 39.139358] ? apparmor_cred_transfer+0x590/0x590 [ 39.144189] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.149716] netlink_rcv_skb+0x172/0x440 [ 39.153762] ? nfnetlink_bind+0x3b0/0x3b0 [ 39.157926] ? netlink_ack+0xb80/0xb80 [ 39.161798] ? __netlink_ns_capable+0x100/0x130 [ 39.166455] nfnetlink_rcv+0x1c0/0x4d0 [ 39.170329] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 39.175074] ? kasan_check_write+0x14/0x20 [ 39.179297] netlink_unicast+0x5a5/0x760 [ 39.183348] ? netlink_attachskb+0x9a0/0x9a0 [ 39.187746] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.193266] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 39.198270] netlink_sendmsg+0xa18/0xfc0 [ 39.202328] ? netlink_unicast+0x760/0x760 [ 39.206550] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 39.211468] ? apparmor_socket_sendmsg+0x29/0x30 [ 39.216211] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.221732] ? security_socket_sendmsg+0x94/0xc0 [ 39.226490] ? netlink_unicast+0x760/0x760 [ 39.230724] sock_sendmsg+0xd5/0x120 [ 39.234447] ___sys_sendmsg+0x7fd/0x930 [ 39.238410] ? find_held_lock+0x36/0x1c0 [ 39.242474] ? copy_msghdr_from_user+0x580/0x580 [ 39.247220] ? zap_class+0x640/0x640 [ 39.250922] ? zap_class+0x640/0x640 [ 39.254617] ? zap_class+0x640/0x640 [ 39.258324] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.263933] ? __fget_light+0x2e9/0x430 [ 39.267889] ? fget_raw+0x20/0x20 [ 39.271333] ? __do_page_fault+0x620/0xe60 [ 39.275552] ? lock_downgrade+0x900/0x900 [ 39.279684] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 39.284596] ? kasan_check_read+0x11/0x20 [ 39.288733] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.294258] ? sockfd_lookup_light+0xc5/0x160 [ 39.298736] __sys_sendmsg+0x11d/0x280 [ 39.302608] ? __ia32_sys_shutdown+0x80/0x80 [ 39.307001] ? up_read_non_owner+0x100/0x100 [ 39.311396] ? do_syscall_64+0x9a/0x820 [ 39.315360] ? do_syscall_64+0x9a/0x820 [ 39.319339] ? trace_hardirqs_off_caller+0x310/0x310 [ 39.324433] __x64_sys_sendmsg+0x78/0xb0 [ 39.328496] do_syscall_64+0x1b9/0x820 [ 39.332370] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 39.337718] ? syscall_return_slowpath+0x5e0/0x5e0 [ 39.342628] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.347459] ? trace_hardirqs_on_caller+0x310/0x310 [ 39.352464] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 39.357481] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.363004] ? prepare_exit_to_usermode+0x291/0x3b0 [ 39.368012] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.372842] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 39.378032] RIP: 0033:0x4400d9 [ 39.381207] 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 39.400097] RSP: 002b:00007fff8be65398 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 39.407805] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 39.415061] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 39.422315] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 39.429573] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 39.436825] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 39.445191] Kernel Offset: disabled [ 39.448877] Rebooting in 86400 seconds..