[....] 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. [ 28.564789] kauditd_printk_skb: 7 callbacks suppressed [ 28.564801] audit: type=1800 audit(1542301867.753:29): pid=5839 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 [ 28.596359] audit: type=1800 audit(1542301867.753:30): pid=5839 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 syzkaller login: [ 33.237640] sshd (5980) used greatest stack depth: 15632 bytes left Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. executing program [ 40.172348] netlink: 'syz-executor921': attribute type 3 has an invalid length. [ 40.179888] netlink: 'syz-executor921': attribute type 2 has an invalid length. [ 40.188371] WARNING: CPU: 0 PID: 5996 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 40.198895] Kernel panic - not syncing: panic_on_warn set ... [ 40.204771] CPU: 0 PID: 5996 Comm: syz-executor921 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 40.213413] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.222746] Call Trace: [ 40.225333] dump_stack+0x244/0x39d [ 40.228946] ? dump_stack_print_info.cold.1+0x20/0x20 [ 40.234126] panic+0x2ad/0x55c [ 40.237303] ? add_taint.cold.5+0x16/0x16 [ 40.241435] ? __warn.cold.8+0x5/0x45 [ 40.245216] ? __warn+0xe8/0x1d0 [ 40.248565] ? cttimeout_default_get+0x1df/0xb30 [ 40.253306] __warn.cold.8+0x20/0x45 [ 40.257001] ? rcu_softirq_qs+0x20/0x20 [ 40.260959] ? cttimeout_default_get+0x1df/0xb30 [ 40.265698] report_bug+0x254/0x2d0 [ 40.269308] do_error_trap+0x11b/0x200 [ 40.273182] do_invalid_op+0x36/0x40 [ 40.276875] ? cttimeout_default_get+0x1df/0xb30 [ 40.281612] invalid_op+0x14/0x20 [ 40.285051] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 40.290393] 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 11 e5 21 fb <0f> 0b 41 bd a1 ff ff ff eb 06 41 bd a1 ff ff ff e8 fc e4 21 fb 48 [ 40.309273] RSP: 0018:ffff8801d1f8f2b0 EFLAGS: 00010293 [ 40.314617] RAX: ffff8801c238c000 RBX: ffffffff88bfad20 RCX: ffffffff865dc36c [ 40.321881] RDX: 0000000000000000 RSI: ffffffff865dc39f RDI: 0000000000000001 [ 40.329128] RBP: ffff8801d1f8f3c0 R08: ffff8801c238c000 R09: ffffed003b5c5b67 [ 40.336375] R10: 0000000000000002 R11: ffff8801dae2db3b R12: 0000000000000088 [ 40.343625] R13: ffff8801c2874340 R14: 0000000000000000 R15: 0000000000000088 [ 40.350885] ? cttimeout_default_get+0x1ac/0xb30 [ 40.355622] ? cttimeout_default_get+0x1df/0xb30 [ 40.360364] ? lock_downgrade+0x900/0x900 [ 40.364492] ? check_preemption_disabled+0x48/0x280 [ 40.369488] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.374244] ? __lock_is_held+0xb5/0x140 [ 40.378292] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.383038] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 40.387350] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.391482] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.397003] ? refcount_sub_and_test_checked+0x203/0x310 [ 40.402457] ? refcount_dec_if_one+0x180/0x180 [ 40.407032] ? netlink_deliver_tap+0x32e/0xf80 [ 40.411594] ? lock_downgrade+0x900/0x900 [ 40.415722] ? check_preemption_disabled+0x48/0x280 [ 40.420725] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.426245] ? apparmor_capable+0x355/0x6c0 [ 40.430571] ? apparmor_cred_transfer+0x590/0x590 [ 40.435399] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.440919] netlink_rcv_skb+0x172/0x440 [ 40.444961] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.449089] ? netlink_ack+0xb80/0xb80 [ 40.452969] ? __netlink_ns_capable+0x100/0x130 [ 40.457620] nfnetlink_rcv+0x1c0/0x4d0 [ 40.461487] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 40.466230] ? kasan_check_write+0x14/0x20 [ 40.470449] netlink_unicast+0x5a5/0x760 [ 40.474493] ? netlink_attachskb+0x9a0/0x9a0 [ 40.478882] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.484403] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.489404] netlink_sendmsg+0xa18/0xfc0 [ 40.493449] ? netlink_unicast+0x760/0x760 [ 40.497665] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 40.502576] ? apparmor_socket_sendmsg+0x29/0x30 [ 40.507315] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.512842] ? security_socket_sendmsg+0x94/0xc0 [ 40.517595] ? netlink_unicast+0x760/0x760 [ 40.521814] sock_sendmsg+0xd5/0x120 [ 40.525512] ___sys_sendmsg+0x7fd/0x930 [ 40.529471] ? find_held_lock+0x36/0x1c0 [ 40.533515] ? copy_msghdr_from_user+0x580/0x580 [ 40.538254] ? graph_lock+0x270/0x270 [ 40.542041] ? graph_lock+0x270/0x270 [ 40.545825] ? graph_lock+0x270/0x270 [ 40.549610] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.555129] ? __fget_light+0x2e9/0x430 [ 40.559083] ? fget_raw+0x20/0x20 [ 40.562523] ? __do_page_fault+0x60e/0xe40 [ 40.566761] ? lock_downgrade+0x900/0x900 [ 40.570893] ? kasan_check_read+0x11/0x20 [ 40.575043] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.580561] ? sockfd_lookup_light+0xc5/0x160 [ 40.585055] __sys_sendmsg+0x11d/0x280 [ 40.588937] ? __ia32_sys_shutdown+0x80/0x80 [ 40.593327] ? up_read_non_owner+0x100/0x100 [ 40.597721] ? do_syscall_64+0x9a/0x820 [ 40.601677] ? do_syscall_64+0x9a/0x820 [ 40.605673] ? trace_hardirqs_off_caller+0x300/0x300 [ 40.610764] __x64_sys_sendmsg+0x78/0xb0 [ 40.614825] do_syscall_64+0x1b9/0x820 [ 40.618709] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.624056] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.628963] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.633786] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.638785] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.643783] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.649300] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.654303] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.659135] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.664307] RIP: 0033:0x4400d9 [ 40.667496] 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 [ 40.686380] RSP: 002b:00007fff4b1f0698 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 40.694081] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 40.701328] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 40.702928] kobject: 'regulatory.0' (00000000dcca39d2): kobject_uevent_env [ 40.708582] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 40.708595] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 40.708604] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 40.716548] Kernel Offset: disabled [ 40.741915] Rebooting in 86400 seconds..