[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 29.773898] kauditd_printk_skb: 7 callbacks suppressed [ 29.773911] audit: type=1800 audit(1542302475.283:29): pid=5953 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 [ 29.802293] audit: type=1800 audit(1542302475.283:30): pid=5953 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 '10.128.0.3' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.635395] netlink: 'syz-executor373': attribute type 3 has an invalid length. [ 40.642956] netlink: 'syz-executor373': attribute type 2 has an invalid length. [ 40.651411] WARNING: CPU: 0 PID: 6108 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 40.661943] Kernel panic - not syncing: panic_on_warn set ... [ 40.667811] CPU: 0 PID: 6108 Comm: syz-executor373 Not tainted 4.20.0-rc2+ #335 [ 40.675236] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.684573] Call Trace: [ 40.687143] dump_stack+0x244/0x39d [ 40.690764] ? dump_stack_print_info.cold.1+0x20/0x20 [ 40.695941] panic+0x2ad/0x55c [ 40.699128] ? add_taint.cold.5+0x16/0x16 [ 40.703272] ? __warn.cold.8+0x5/0x45 [ 40.707053] ? __warn+0xe8/0x1d0 [ 40.710405] ? cttimeout_default_get+0x1df/0xb30 [ 40.715173] __warn.cold.8+0x20/0x45 [ 40.718867] ? rcu_softirq_qs+0x20/0x20 [ 40.722823] ? cttimeout_default_get+0x1df/0xb30 [ 40.727564] report_bug+0x254/0x2d0 [ 40.731182] do_error_trap+0x11b/0x200 [ 40.735066] do_invalid_op+0x36/0x40 [ 40.738776] ? cttimeout_default_get+0x1df/0xb30 [ 40.743522] invalid_op+0x14/0x20 [ 40.746956] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 40.752304] 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 f1 20 fb <0f> 0b 41 bd a1 ff ff ff eb 06 41 bd a1 ff ff ff e8 7c f1 20 fb 48 [ 40.771191] RSP: 0018:ffff8881ba7072b0 EFLAGS: 00010293 [ 40.776555] RAX: ffff8881bacb25c0 RBX: ffffffff88bf58e0 RCX: ffffffff865e961c [ 40.783810] RDX: 0000000000000000 RSI: ffffffff865e964f RDI: 0000000000000001 [ 40.791066] RBP: ffff8881ba7073c0 R08: ffff8881bacb25c0 R09: ffffed103b5c5b67 [ 40.798359] R10: 0000000000000002 R11: ffff8881dae2db3b R12: 0000000000000088 [ 40.805652] R13: ffff8881b9bd3c80 R14: 0000000000000017 R15: 0000000000000088 [ 40.812921] ? cttimeout_default_get+0x1ac/0xb30 [ 40.817663] ? cttimeout_default_get+0x1df/0xb30 [ 40.822408] ? lock_downgrade+0x900/0x900 [ 40.826545] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.831304] ? __lock_is_held+0xb5/0x140 [ 40.835352] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.840094] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 40.844409] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.848546] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.854071] ? refcount_sub_and_test_checked+0x203/0x310 [ 40.859508] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 40.866291] ? netlink_deliver_tap+0x32e/0xf80 [ 40.870860] ? lock_downgrade+0x900/0x900 [ 40.874993] ? check_preemption_disabled+0x48/0x280 [ 40.879998] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.885524] ? apparmor_capable+0x355/0x6c0 [ 40.889832] ? rcu_softirq_qs+0x20/0x20 [ 40.893790] ? apparmor_cred_transfer+0x590/0x590 [ 40.898632] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.904165] netlink_rcv_skb+0x172/0x440 [ 40.908214] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.912347] ? netlink_ack+0xb80/0xb80 [ 40.916221] ? __netlink_ns_capable+0x100/0x130 [ 40.920879] nfnetlink_rcv+0x1c0/0x4d0 [ 40.924751] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 40.929493] ? kasan_check_write+0x14/0x20 [ 40.933715] netlink_unicast+0x5a5/0x760 [ 40.937760] ? netlink_attachskb+0x9a0/0x9a0 [ 40.942159] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.947682] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.952686] netlink_sendmsg+0xa18/0xfc0 [ 40.956733] ? netlink_unicast+0x760/0x760 [ 40.960951] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 40.965867] ? apparmor_socket_sendmsg+0x29/0x30 [ 40.970606] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.976130] ? security_socket_sendmsg+0x94/0xc0 [ 40.980874] ? netlink_unicast+0x760/0x760 [ 40.985097] sock_sendmsg+0xd5/0x120 [ 40.988794] ___sys_sendmsg+0x7fd/0x930 [ 40.992752] ? find_held_lock+0x36/0x1c0 [ 40.996802] ? copy_msghdr_from_user+0x580/0x580 [ 41.001553] ? zap_class+0x640/0x640 [ 41.005280] ? zap_class+0x640/0x640 [ 41.008973] ? zap_class+0x640/0x640 [ 41.012668] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.018187] ? __fget_light+0x2e9/0x430 [ 41.022144] ? fget_raw+0x20/0x20 [ 41.025607] ? __do_page_fault+0x620/0xe60 [ 41.029826] ? lock_downgrade+0x900/0x900 [ 41.033957] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 41.038881] ? kasan_check_read+0x11/0x20 [ 41.043017] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 41.048537] ? sockfd_lookup_light+0xc5/0x160 [ 41.053018] __sys_sendmsg+0x11d/0x280 [ 41.056892] ? __ia32_sys_shutdown+0x80/0x80 [ 41.061288] ? up_read_non_owner+0x100/0x100 [ 41.065680] ? do_syscall_64+0x9a/0x820 [ 41.069653] ? do_syscall_64+0x9a/0x820 [ 41.073634] ? trace_hardirqs_off_caller+0x310/0x310 [ 41.078725] __x64_sys_sendmsg+0x78/0xb0 [ 41.082781] do_syscall_64+0x1b9/0x820 [ 41.086702] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 41.092084] ? syscall_return_slowpath+0x5e0/0x5e0 [ 41.096992] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.101834] ? trace_hardirqs_on_caller+0x310/0x310 [ 41.106834] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 41.111832] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 41.117349] ? prepare_exit_to_usermode+0x291/0x3b0 [ 41.122353] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.127199] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 41.132371] RIP: 0033:0x4400d9 [ 41.135548] 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 [ 41.154430] RSP: 002b:00007ffe47ab1138 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 41.162119] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 41.169372] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 41.176622] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 41.183889] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 41.191163] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 41.199413] Kernel Offset: disabled [ 41.203077] Rebooting in 86400 seconds..