[....] 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. [ 27.951368] kauditd_printk_skb: 7 callbacks suppressed [ 27.951380] audit: type=1800 audit(1542300779.913:29): pid=5821 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 [ 27.979421] audit: type=1800 audit(1542300779.923:30): pid=5821 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 '10.128.0.93' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 38.321798] netlink: 'syz-executor238': attribute type 3 has an invalid length. [ 38.329481] netlink: 'syz-executor238': attribute type 2 has an invalid length. [ 38.337569] WARNING: CPU: 0 PID: 5976 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 38.348126] Kernel panic - not syncing: panic_on_warn set ... [ 38.354021] CPU: 0 PID: 5976 Comm: syz-executor238 Not tainted 4.20.0-rc2+ #335 [ 38.361554] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.370899] Call Trace: [ 38.373488] dump_stack+0x244/0x39d [ 38.377098] ? dump_stack_print_info.cold.1+0x20/0x20 [ 38.382285] panic+0x2ad/0x55c [ 38.385477] ? add_taint.cold.5+0x16/0x16 [ 38.389611] ? __warn.cold.8+0x5/0x45 [ 38.393407] ? __warn+0xe8/0x1d0 [ 38.396774] ? cttimeout_default_get+0x1df/0xb30 [ 38.401522] __warn.cold.8+0x20/0x45 [ 38.405214] ? rcu_softirq_qs+0x20/0x20 [ 38.409170] ? cttimeout_default_get+0x1df/0xb30 [ 38.413920] report_bug+0x254/0x2d0 [ 38.417535] do_error_trap+0x11b/0x200 [ 38.421541] do_invalid_op+0x36/0x40 [ 38.425241] ? cttimeout_default_get+0x1df/0xb30 [ 38.430096] invalid_op+0x14/0x20 [ 38.433538] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 38.438938] 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 [ 38.457975] RSP: 0018:ffff8881c2f6f2b0 EFLAGS: 00010293 [ 38.463317] RAX: ffff8881b2a881c0 RBX: ffffffff88bf58e0 RCX: ffffffff865e961c [ 38.470667] RDX: 0000000000000000 RSI: ffffffff865e964f RDI: 0000000000000001 [ 38.477935] RBP: ffff8881c2f6f3c0 R08: ffff8881b2a881c0 R09: ffffed103b5c5b67 [ 38.485189] R10: 0000000000000002 R11: ffff8881dae2db3b R12: 0000000000000088 [ 38.492439] R13: ffff8881bf8cd780 R14: 0000000000000017 R15: 0000000000000088 [ 38.499816] ? cttimeout_default_get+0x1ac/0xb30 [ 38.504697] ? cttimeout_default_get+0x1df/0xb30 [ 38.509475] ? lock_downgrade+0x900/0x900 [ 38.513612] ? check_preemption_disabled+0x48/0x280 [ 38.518616] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 38.523366] ? __lock_is_held+0xb5/0x140 [ 38.527485] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 38.532337] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 38.536664] ? nfnetlink_bind+0x3b0/0x3b0 [ 38.540812] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.546337] ? refcount_sub_and_test_checked+0x203/0x310 [ 38.551774] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 38.557322] ? netlink_deliver_tap+0x32e/0xf80 [ 38.561896] ? lock_downgrade+0x900/0x900 [ 38.566034] ? check_preemption_disabled+0x48/0x280 [ 38.571037] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 38.576564] ? apparmor_capable+0x355/0x6c0 [ 38.580887] ? rcu_softirq_qs+0x20/0x20 [ 38.584871] ? apparmor_cred_transfer+0x590/0x590 [ 38.589707] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.595234] netlink_rcv_skb+0x172/0x440 [ 38.599278] ? nfnetlink_bind+0x3b0/0x3b0 [ 38.603413] ? netlink_ack+0xb80/0xb80 [ 38.607286] ? __netlink_ns_capable+0x100/0x130 [ 38.611941] nfnetlink_rcv+0x1c0/0x4d0 [ 38.615816] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 38.620560] ? kasan_check_write+0x14/0x20 [ 38.624789] netlink_unicast+0x5a5/0x760 [ 38.628840] ? netlink_attachskb+0x9a0/0x9a0 [ 38.633248] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.638770] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 38.643787] netlink_sendmsg+0xa18/0xfc0 [ 38.647839] ? netlink_unicast+0x760/0x760 [ 38.652053] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 38.656977] ? apparmor_socket_sendmsg+0x29/0x30 [ 38.661719] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.667257] ? security_socket_sendmsg+0x94/0xc0 [ 38.672019] ? netlink_unicast+0x760/0x760 [ 38.676346] sock_sendmsg+0xd5/0x120 [ 38.680046] ___sys_sendmsg+0x7fd/0x930 [ 38.684005] ? find_held_lock+0x36/0x1c0 [ 38.688056] ? copy_msghdr_from_user+0x580/0x580 [ 38.692800] ? zap_class+0x640/0x640 [ 38.696504] ? zap_class+0x640/0x640 [ 38.700200] ? zap_class+0x640/0x640 [ 38.703967] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.709499] ? __fget_light+0x2e9/0x430 [ 38.713460] ? fget_raw+0x20/0x20 [ 38.716908] ? __do_page_fault+0x620/0xe60 [ 38.721143] ? lock_downgrade+0x900/0x900 [ 38.725281] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 38.730199] ? kasan_check_read+0x11/0x20 [ 38.734338] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 38.739865] ? sockfd_lookup_light+0xc5/0x160 [ 38.744356] __sys_sendmsg+0x11d/0x280 [ 38.748249] ? __ia32_sys_shutdown+0x80/0x80 [ 38.752658] ? up_read_non_owner+0x100/0x100 [ 38.757053] ? do_syscall_64+0x9a/0x820 [ 38.761012] ? do_syscall_64+0x9a/0x820 [ 38.764986] ? trace_hardirqs_off_caller+0x310/0x310 [ 38.770083] __x64_sys_sendmsg+0x78/0xb0 [ 38.774136] do_syscall_64+0x1b9/0x820 [ 38.778025] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 38.783397] ? syscall_return_slowpath+0x5e0/0x5e0 [ 38.788328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.793153] ? trace_hardirqs_on_caller+0x310/0x310 [ 38.798253] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 38.803259] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 38.808793] ? prepare_exit_to_usermode+0x291/0x3b0 [ 38.813792] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.818621] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 38.823788] RIP: 0033:0x4400d9 [ 38.826973] 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 [ 38.845853] RSP: 002b:00007ffc625df358 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 38.853544] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 38.860803] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 38.868055] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 38.875311] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 38.882593] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 38.890981] Kernel Offset: disabled [ 38.894648] Rebooting in 86400 seconds..