[....] 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. [ 28.511071] kauditd_printk_skb: 7 callbacks suppressed [ 28.511097] audit: type=1800 audit(1542315777.295:29): pid=5873 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 [ 28.542699] audit: type=1800 audit(1542315777.295:30): pid=5873 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 '10.128.0.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.367773] netlink: 'syz-executor144': attribute type 3 has an invalid length. [ 59.375418] netlink: 'syz-executor144': attribute type 2 has an invalid length. [ 59.383643] WARNING: CPU: 1 PID: 6030 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 59.394169] Kernel panic - not syncing: panic_on_warn set ... [ 59.400038] CPU: 1 PID: 6030 Comm: syz-executor144 Not tainted 4.20.0-rc2+ #297 [ 59.407597] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.416931] Call Trace: [ 59.419500] dump_stack+0x244/0x39d [ 59.423114] ? dump_stack_print_info.cold.1+0x20/0x20 [ 59.428289] panic+0x2ad/0x55c [ 59.431458] ? add_taint.cold.5+0x16/0x16 [ 59.435588] ? __warn.cold.8+0x5/0x45 [ 59.439369] ? __warn+0xe8/0x1d0 [ 59.442717] ? cttimeout_default_get+0x1df/0xb30 [ 59.447453] __warn.cold.8+0x20/0x45 [ 59.451144] ? rcu_softirq_qs+0x20/0x20 [ 59.455101] ? cttimeout_default_get+0x1df/0xb30 [ 59.459839] report_bug+0x254/0x2d0 [ 59.463450] do_error_trap+0x11b/0x200 [ 59.467334] do_invalid_op+0x36/0x40 [ 59.471029] ? cttimeout_default_get+0x1df/0xb30 [ 59.475768] invalid_op+0x14/0x20 [ 59.479206] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 59.484550] 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 [ 59.503434] RSP: 0018:ffff8881c13972b0 EFLAGS: 00010293 [ 59.508775] RAX: ffff8881d11580c0 RBX: ffffffff88bf5f60 RCX: ffffffff865f31bc [ 59.516131] RDX: 0000000000000000 RSI: ffffffff865f31ef RDI: 0000000000000001 [ 59.523544] RBP: ffff8881c13973c0 R08: ffff8881d11580c0 R09: ffffed103b5e5b67 [ 59.530794] R10: 0000000000000002 R11: ffff8881daf2db3b R12: 0000000000000088 [ 59.538042] R13: ffff8881be149080 R14: 0000000000000017 R15: 0000000000000088 [ 59.545306] ? cttimeout_default_get+0x1ac/0xb30 [ 59.550045] ? cttimeout_default_get+0x1df/0xb30 [ 59.554791] ? lock_downgrade+0x900/0x900 [ 59.558925] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 59.563665] ? __lock_is_held+0xb5/0x140 [ 59.567711] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 59.572465] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 59.576801] ? nfnetlink_bind+0x3b0/0x3b0 [ 59.580942] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.586461] ? refcount_sub_and_test_checked+0x203/0x310 [ 59.591900] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 59.597335] ? netlink_deliver_tap+0x32e/0xf80 [ 59.601899] ? lock_downgrade+0x900/0x900 [ 59.606060] ? check_preemption_disabled+0x48/0x280 [ 59.611059] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 59.616577] ? apparmor_capable+0x355/0x6c0 [ 59.620880] ? rcu_softirq_qs+0x20/0x20 [ 59.624839] ? apparmor_cred_transfer+0x590/0x590 [ 59.629679] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.635203] netlink_rcv_skb+0x172/0x440 [ 59.639249] ? nfnetlink_bind+0x3b0/0x3b0 [ 59.643382] ? netlink_ack+0xb80/0xb80 [ 59.647255] ? __netlink_ns_capable+0x100/0x130 [ 59.651910] nfnetlink_rcv+0x1c0/0x4d0 [ 59.655783] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 59.660531] ? kasan_check_write+0x14/0x20 [ 59.664765] netlink_unicast+0x5a5/0x760 [ 59.668832] ? netlink_attachskb+0x9a0/0x9a0 [ 59.673224] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.678748] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 59.683750] netlink_sendmsg+0xa18/0xfc0 [ 59.687796] ? netlink_unicast+0x760/0x760 [ 59.692028] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 59.696942] ? apparmor_socket_sendmsg+0x29/0x30 [ 59.701678] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.707201] ? security_socket_sendmsg+0x94/0xc0 [ 59.711936] ? netlink_unicast+0x760/0x760 [ 59.716151] sock_sendmsg+0xd5/0x120 [ 59.719843] ___sys_sendmsg+0x7fd/0x930 [ 59.723800] ? find_held_lock+0x36/0x1c0 [ 59.727843] ? copy_msghdr_from_user+0x580/0x580 [ 59.732590] ? zap_class+0x640/0x640 [ 59.736289] ? zap_class+0x640/0x640 [ 59.739987] ? zap_class+0x640/0x640 [ 59.743686] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.749228] ? __fget_light+0x2e9/0x430 [ 59.753182] ? fget_raw+0x20/0x20 [ 59.756621] ? __do_page_fault+0x620/0xe60 [ 59.760840] ? lock_downgrade+0x900/0x900 [ 59.764986] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 59.769900] ? kasan_check_read+0x11/0x20 [ 59.774050] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 59.779574] ? sockfd_lookup_light+0xc5/0x160 [ 59.784052] __sys_sendmsg+0x11d/0x280 [ 59.787937] ? __ia32_sys_shutdown+0x80/0x80 [ 59.792326] ? up_read_non_owner+0x100/0x100 [ 59.796721] ? do_syscall_64+0x9a/0x820 [ 59.800677] ? do_syscall_64+0x9a/0x820 [ 59.804638] ? trace_hardirqs_off_caller+0x310/0x310 [ 59.809729] __x64_sys_sendmsg+0x78/0xb0 [ 59.813774] do_syscall_64+0x1b9/0x820 [ 59.817652] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 59.823010] ? syscall_return_slowpath+0x5e0/0x5e0 [ 59.827926] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.832754] ? trace_hardirqs_on_caller+0x310/0x310 [ 59.837761] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 59.842773] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 59.848296] ? prepare_exit_to_usermode+0x291/0x3b0 [ 59.853295] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 59.858123] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.863293] RIP: 0033:0x4400d9 [ 59.866466] 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 [ 59.885347] RSP: 002b:00007ffc43e013a8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 59.893036] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 59.900303] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 59.907554] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 59.914805] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 59.922059] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 59.930362] Kernel Offset: disabled [ 59.934025] Rebooting in 86400 seconds..