[....] 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. [ 28.162302] kauditd_printk_skb: 7 callbacks suppressed [ 28.162311] audit: type=1800 audit(1542313859.574:29): pid=5815 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 [ 28.188129] audit: type=1800 audit(1542313859.574:30): pid=5815 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 '10.128.10.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 35.446478] netlink: 'syz-executor690': attribute type 3 has an invalid length. [ 35.454047] netlink: 'syz-executor690': attribute type 2 has an invalid length. [ 35.461948] WARNING: CPU: 1 PID: 5969 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 35.472502] Kernel panic - not syncing: panic_on_warn set ... [ 35.478376] CPU: 1 PID: 5969 Comm: syz-executor690 Not tainted 4.20.0-rc2+ #297 [ 35.485800] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.495134] Call Trace: [ 35.497704] dump_stack+0x244/0x39d [ 35.501322] ? dump_stack_print_info.cold.1+0x20/0x20 [ 35.506527] panic+0x2ad/0x55c [ 35.509718] ? add_taint.cold.5+0x16/0x16 [ 35.513854] ? __warn.cold.8+0x5/0x45 [ 35.517636] ? __warn+0xe8/0x1d0 [ 35.520989] ? cttimeout_default_get+0x1df/0xb30 [ 35.525727] __warn.cold.8+0x20/0x45 [ 35.529422] ? rcu_softirq_qs+0x20/0x20 [ 35.533405] ? cttimeout_default_get+0x1df/0xb30 [ 35.538142] report_bug+0x254/0x2d0 [ 35.541751] do_error_trap+0x11b/0x200 [ 35.545622] do_invalid_op+0x36/0x40 [ 35.549318] ? cttimeout_default_get+0x1df/0xb30 [ 35.554064] invalid_op+0x14/0x20 [ 35.557502] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 35.562846] 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 [ 35.581729] RSP: 0018:ffff8881c22872b0 EFLAGS: 00010293 [ 35.587233] RAX: ffff8881c1c5e140 RBX: ffffffff88bf5f60 RCX: ffffffff865f31bc [ 35.594489] RDX: 0000000000000000 RSI: ffffffff865f31ef RDI: 0000000000000001 [ 35.601740] RBP: ffff8881c22873c0 R08: ffff8881c1c5e140 R09: ffffed103b5e5b67 [ 35.609038] R10: 0000000000000002 R11: ffff8881daf2db3b R12: 0000000000000088 [ 35.616291] R13: ffff8881b78af280 R14: 0000000000000000 R15: 0000000000000088 [ 35.623558] ? cttimeout_default_get+0x1ac/0xb30 [ 35.628295] ? cttimeout_default_get+0x1df/0xb30 [ 35.633046] ? lock_downgrade+0x900/0x900 [ 35.637202] ? check_preemption_disabled+0x48/0x280 [ 35.642216] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 35.646967] ? __lock_is_held+0xb5/0x140 [ 35.651014] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 35.655751] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 35.660087] ? nfnetlink_bind+0x3b0/0x3b0 [ 35.664220] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.669742] ? refcount_sub_and_test_checked+0x203/0x310 [ 35.675179] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 35.680635] ? netlink_deliver_tap+0x32e/0xf80 [ 35.685204] ? lock_downgrade+0x900/0x900 [ 35.689338] ? check_preemption_disabled+0x48/0x280 [ 35.694342] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.699878] ? apparmor_capable+0x355/0x6c0 [ 35.704181] ? rcu_softirq_qs+0x20/0x20 [ 35.708137] ? apparmor_cred_transfer+0x590/0x590 [ 35.712962] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.718576] netlink_rcv_skb+0x172/0x440 [ 35.722619] ? nfnetlink_bind+0x3b0/0x3b0 [ 35.726752] ? netlink_ack+0xb80/0xb80 [ 35.730625] ? __netlink_ns_capable+0x100/0x130 [ 35.735286] nfnetlink_rcv+0x1c0/0x4d0 [ 35.739163] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 35.743905] ? kasan_check_write+0x14/0x20 [ 35.748122] netlink_unicast+0x5a5/0x760 [ 35.752176] ? netlink_attachskb+0x9a0/0x9a0 [ 35.756572] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.762090] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 35.767092] netlink_sendmsg+0xa18/0xfc0 [ 35.771152] ? netlink_unicast+0x760/0x760 [ 35.775367] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 35.780283] ? apparmor_socket_sendmsg+0x29/0x30 [ 35.785026] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.790546] ? security_socket_sendmsg+0x94/0xc0 [ 35.795284] ? netlink_unicast+0x760/0x760 [ 35.799511] sock_sendmsg+0xd5/0x120 [ 35.803207] ___sys_sendmsg+0x7fd/0x930 [ 35.807162] ? find_held_lock+0x36/0x1c0 [ 35.811211] ? copy_msghdr_from_user+0x580/0x580 [ 35.815947] ? zap_class+0x640/0x640 [ 35.819649] ? zap_class+0x640/0x640 [ 35.823343] ? zap_class+0x640/0x640 [ 35.827111] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.832627] ? __fget_light+0x2e9/0x430 [ 35.836585] ? fget_raw+0x20/0x20 [ 35.840064] ? __do_page_fault+0x620/0xe60 [ 35.844282] ? lock_downgrade+0x900/0x900 [ 35.848420] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 35.853330] ? kasan_check_read+0x11/0x20 [ 35.857464] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.862984] ? sockfd_lookup_light+0xc5/0x160 [ 35.867464] __sys_sendmsg+0x11d/0x280 [ 35.871336] ? __ia32_sys_shutdown+0x80/0x80 [ 35.875726] ? up_read_non_owner+0x100/0x100 [ 35.880137] ? do_syscall_64+0x9a/0x820 [ 35.884095] ? do_syscall_64+0x9a/0x820 [ 35.888061] ? trace_hardirqs_off_caller+0x310/0x310 [ 35.893154] __x64_sys_sendmsg+0x78/0xb0 [ 35.897196] do_syscall_64+0x1b9/0x820 [ 35.901078] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 35.906425] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.911332] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.916174] ? trace_hardirqs_on_caller+0x310/0x310 [ 35.921174] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.926173] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.931696] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.936701] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.941534] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.946712] RIP: 0033:0x4400d9 [ 35.949910] 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 [ 35.968794] RSP: 002b:00007ffe1d846da8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 35.976481] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 35.983737] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 35.990996] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 35.998247] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 36.005497] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 36.013983] Kernel Offset: disabled [ 36.017668] Rebooting in 86400 seconds..