[....] 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. [ 28.589136] kauditd_printk_skb: 7 callbacks suppressed [ 28.589148] audit: type=1800 audit(1542300789.056:29): pid=5832 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 [ 28.622900] audit: type=1800 audit(1542300789.066:30): pid=5832 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 '10.128.10.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.382751] netlink: 'syz-executor463': attribute type 3 has an invalid length. [ 36.390287] netlink: 'syz-executor463': attribute type 2 has an invalid length. [ 36.398271] WARNING: CPU: 1 PID: 5986 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 36.408863] Kernel panic - not syncing: panic_on_warn set ... [ 36.414735] CPU: 1 PID: 5986 Comm: syz-executor463 Not tainted 4.20.0-rc2+ #186 [ 36.422163] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.431502] Call Trace: [ 36.434076] dump_stack+0x244/0x39d [ 36.437735] ? dump_stack_print_info.cold.1+0x20/0x20 [ 36.442920] panic+0x2ad/0x55c [ 36.446099] ? add_taint.cold.5+0x16/0x16 [ 36.450236] ? __warn.cold.8+0x5/0x45 [ 36.454023] ? __warn+0xe8/0x1d0 [ 36.457393] ? cttimeout_default_get+0x1df/0xb30 [ 36.462136] __warn.cold.8+0x20/0x45 [ 36.465832] ? rcu_softirq_qs+0x20/0x20 [ 36.469792] ? cttimeout_default_get+0x1df/0xb30 [ 36.474544] report_bug+0x254/0x2d0 [ 36.478161] do_error_trap+0x11b/0x200 [ 36.482086] do_invalid_op+0x36/0x40 [ 36.485787] ? cttimeout_default_get+0x1df/0xb30 [ 36.490529] invalid_op+0x14/0x20 [ 36.493976] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 36.499477] 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 91 e1 20 fb <0f> 0b 41 bd a1 ff ff ff eb 06 41 bd a1 ff ff ff e8 7c e1 20 fb 48 [ 36.518383] RSP: 0018:ffff8881b4ccf2b0 EFLAGS: 00010293 [ 36.523747] RAX: ffff8881c2b44040 RBX: ffffffff88bf58e0 RCX: ffffffff865ea61c [ 36.531014] RDX: 0000000000000000 RSI: ffffffff865ea64f RDI: 0000000000000001 [ 36.538270] RBP: ffff8881b4ccf3c0 R08: ffff8881c2b44040 R09: ffffed103b5e5b67 [ 36.545523] R10: 0000000000000002 R11: ffff8881daf2db3b R12: 0000000000000088 [ 36.552789] R13: ffff8881bbad72c0 R14: 0000000000000000 R15: 0000000000000088 [ 36.560056] ? cttimeout_default_get+0x1ac/0xb30 [ 36.564799] ? cttimeout_default_get+0x1df/0xb30 [ 36.569545] ? lock_downgrade+0x900/0x900 [ 36.573695] ? check_preemption_disabled+0x48/0x280 [ 36.578716] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 36.583471] ? __lock_is_held+0xb5/0x140 [ 36.587521] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 36.592266] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 36.596582] ? nfnetlink_bind+0x3b0/0x3b0 [ 36.600725] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.606248] ? refcount_sub_and_test_checked+0x203/0x310 [ 36.611687] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 36.617132] ? netlink_deliver_tap+0x32e/0xf80 [ 36.621748] ? lock_downgrade+0x900/0x900 [ 36.625882] ? check_preemption_disabled+0x48/0x280 [ 36.630888] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.636408] ? apparmor_capable+0x355/0x6c0 [ 36.640759] ? rcu_softirq_qs+0x20/0x20 [ 36.644751] ? apparmor_cred_transfer+0x590/0x590 [ 36.649585] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.655111] netlink_rcv_skb+0x172/0x440 [ 36.659159] ? nfnetlink_bind+0x3b0/0x3b0 [ 36.663319] ? netlink_ack+0xb80/0xb80 [ 36.667190] ? __netlink_ns_capable+0x100/0x130 [ 36.671846] nfnetlink_rcv+0x1c0/0x4d0 [ 36.675740] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 36.680497] ? kasan_check_write+0x14/0x20 [ 36.684733] netlink_unicast+0x5a5/0x760 [ 36.688808] ? netlink_attachskb+0x9a0/0x9a0 [ 36.693245] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.698764] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 36.703769] netlink_sendmsg+0xa18/0xfc0 [ 36.707826] ? netlink_unicast+0x760/0x760 [ 36.712087] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 36.717003] ? apparmor_socket_sendmsg+0x29/0x30 [ 36.721759] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.727281] ? security_socket_sendmsg+0x94/0xc0 [ 36.732033] ? netlink_unicast+0x760/0x760 [ 36.736264] sock_sendmsg+0xd5/0x120 [ 36.739966] ___sys_sendmsg+0x7fd/0x930 [ 36.743944] ? find_held_lock+0x36/0x1c0 [ 36.747998] ? copy_msghdr_from_user+0x580/0x580 [ 36.752742] ? zap_class+0x640/0x640 [ 36.756444] ? zap_class+0x640/0x640 [ 36.760156] ? zap_class+0x640/0x640 [ 36.763873] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.769397] ? __fget_light+0x2e9/0x430 [ 36.773356] ? fget_raw+0x20/0x20 [ 36.776802] ? __do_page_fault+0x620/0xe60 [ 36.781025] ? lock_downgrade+0x900/0x900 [ 36.785167] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 36.790088] ? kasan_check_read+0x11/0x20 [ 36.794231] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 36.799754] ? sockfd_lookup_light+0xc5/0x160 [ 36.804239] __sys_sendmsg+0x11d/0x280 [ 36.808114] ? __ia32_sys_shutdown+0x80/0x80 [ 36.812514] ? up_read_non_owner+0x100/0x100 [ 36.816913] ? do_syscall_64+0x9a/0x820 [ 36.820873] ? do_syscall_64+0x9a/0x820 [ 36.824860] ? trace_hardirqs_off_caller+0x310/0x310 [ 36.829955] __x64_sys_sendmsg+0x78/0xb0 [ 36.834026] do_syscall_64+0x1b9/0x820 [ 36.837902] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.843255] ? syscall_return_slowpath+0x5e0/0x5e0 [ 36.848171] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.853003] ? trace_hardirqs_on_caller+0x310/0x310 [ 36.858026] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 36.863030] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.868557] ? prepare_exit_to_usermode+0x291/0x3b0 [ 36.873576] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.878415] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.883588] RIP: 0033:0x4400d9 [ 36.886771] 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 [ 36.905669] RSP: 002b:00007ffe0f836e48 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 36.913376] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 36.920632] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 36.927888] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 36.935142] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 36.942396] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 36.950826] Kernel Offset: disabled [ 36.954502] Rebooting in 86400 seconds..