[....] 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. [ 29.782571] kauditd_printk_skb: 8 callbacks suppressed [ 29.782584] audit: type=1800 audit(1542299819.564:29): pid=5890 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 [ 29.815212] audit: type=1800 audit(1542299819.564:30): pid=5890 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: [ 33.743573] sshd (6028) used greatest stack depth: 15632 bytes left Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. executing program [ 40.424385] netlink: 'syz-executor985': attribute type 3 has an invalid length. [ 40.432047] netlink: 'syz-executor985': attribute type 2 has an invalid length. [ 40.440106] WARNING: CPU: 0 PID: 6044 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 40.450849] Kernel panic - not syncing: panic_on_warn set ... [ 40.456727] CPU: 0 PID: 6044 Comm: syz-executor985 Not tainted 4.20.0-rc1-next-20181109+ #110 [ 40.465379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.474762] Call Trace: [ 40.477396] dump_stack+0x244/0x39d [ 40.481014] ? dump_stack_print_info.cold.1+0x20/0x20 [ 40.486232] panic+0x2ad/0x55c [ 40.489412] ? add_taint.cold.5+0x16/0x16 [ 40.493563] ? __warn.cold.8+0x5/0x45 [ 40.497346] ? __warn+0xe8/0x1d0 [ 40.500782] ? cttimeout_default_get+0x1df/0xb30 [ 40.505549] __warn.cold.8+0x20/0x45 [ 40.509248] ? rcu_softirq_qs+0x20/0x20 [ 40.513206] ? cttimeout_default_get+0x1df/0xb30 [ 40.517952] report_bug+0x254/0x2d0 [ 40.521570] do_error_trap+0x11b/0x200 [ 40.525455] do_invalid_op+0x36/0x40 [ 40.529206] ? cttimeout_default_get+0x1df/0xb30 [ 40.534079] invalid_op+0x14/0x20 [ 40.537523] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 40.542871] 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 [ 40.561763] RSP: 0018:ffff8801c001f2b0 EFLAGS: 00010293 [ 40.567220] RAX: ffff8801d1f9a080 RBX: ffffffff88bfad20 RCX: ffffffff865dc36c [ 40.574477] RDX: 0000000000000000 RSI: ffffffff865dc39f RDI: 0000000000000001 [ 40.581732] RBP: ffff8801c001f3c0 R08: ffff8801d1f9a080 R09: ffffed003b5c5b67 [ 40.589005] R10: 0000000000000002 R11: ffff8801dae2db3b R12: 0000000000000088 [ 40.596264] R13: ffff8801bc2bd080 R14: 0000000000000017 R15: 0000000000000088 [ 40.603531] ? cttimeout_default_get+0x1ac/0xb30 [ 40.608401] ? cttimeout_default_get+0x1df/0xb30 [ 40.613166] ? lock_downgrade+0x900/0x900 [ 40.617522] ? check_preemption_disabled+0x48/0x280 [ 40.622532] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.627273] ? __lock_is_held+0xb5/0x140 [ 40.631317] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 40.636061] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 40.640380] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.644531] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.650074] ? refcount_sub_and_test_checked+0x203/0x310 [ 40.655631] ? refcount_dec_if_one+0x180/0x180 [ 40.660236] ? netlink_deliver_tap+0x32e/0xf80 [ 40.664874] ? lock_downgrade+0x900/0x900 [ 40.669085] ? check_preemption_disabled+0x48/0x280 [ 40.674095] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.679629] ? apparmor_capable+0x355/0x6c0 [ 40.684068] ? apparmor_cred_transfer+0x590/0x590 [ 40.688900] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.694492] netlink_rcv_skb+0x172/0x440 [ 40.698627] ? nfnetlink_bind+0x3b0/0x3b0 [ 40.702767] ? netlink_ack+0xb80/0xb80 [ 40.706741] ? __netlink_ns_capable+0x100/0x130 [ 40.711444] nfnetlink_rcv+0x1c0/0x4d0 [ 40.715345] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 40.720097] ? kasan_check_write+0x14/0x20 [ 40.724317] netlink_unicast+0x5a5/0x760 [ 40.728370] ? netlink_attachskb+0x9a0/0x9a0 [ 40.732762] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.738289] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.743295] netlink_sendmsg+0xa18/0xfc0 [ 40.747350] ? netlink_unicast+0x760/0x760 [ 40.751581] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 40.756498] ? apparmor_socket_sendmsg+0x29/0x30 [ 40.761245] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.766779] ? security_socket_sendmsg+0x94/0xc0 [ 40.771520] ? netlink_unicast+0x760/0x760 [ 40.775822] sock_sendmsg+0xd5/0x120 [ 40.779527] ___sys_sendmsg+0x7fd/0x930 [ 40.783509] ? find_held_lock+0x36/0x1c0 [ 40.787572] ? copy_msghdr_from_user+0x580/0x580 [ 40.792307] ? graph_lock+0x270/0x270 [ 40.796224] ? graph_lock+0x270/0x270 [ 40.800017] ? graph_lock+0x270/0x270 [ 40.803836] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.809513] ? __fget_light+0x2e9/0x430 [ 40.813481] ? fget_raw+0x20/0x20 [ 40.816940] ? __do_page_fault+0x60e/0xe40 [ 40.821162] ? lock_downgrade+0x900/0x900 [ 40.825387] ? kasan_check_read+0x11/0x20 [ 40.829531] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.835055] ? sockfd_lookup_light+0xc5/0x160 [ 40.839536] __sys_sendmsg+0x11d/0x280 [ 40.843568] ? __ia32_sys_shutdown+0x80/0x80 [ 40.847969] ? up_read_non_owner+0x100/0x100 [ 40.852387] ? do_syscall_64+0x9a/0x820 [ 40.856346] ? do_syscall_64+0x9a/0x820 [ 40.860319] ? trace_hardirqs_off_caller+0x300/0x300 [ 40.865408] __x64_sys_sendmsg+0x78/0xb0 [ 40.869476] do_syscall_64+0x1b9/0x820 [ 40.873364] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.878715] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.883630] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.888460] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.893468] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.899024] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.904036] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.908877] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.914047] RIP: 0033:0x4400d9 [ 40.917259] 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 [ 40.936229] RSP: 002b:00007ffd3e45ede8 EFLAGS: 00000213 ORIG_RAX: 000000000000002e [ 40.943945] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004400d9 [ 40.951221] RDX: 0000000000000000 RSI: 0000000020dddfc8 RDI: 0000000000000003 [ 40.958478] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 40.965830] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401960 [ 40.973090] R13: 00000000004019f0 R14: 0000000000000000 R15: 0000000000000000 [ 40.981742] Kernel Offset: disabled [ 40.985411] Rebooting in 86400 seconds..