[....] 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. [ 30.474424] kauditd_printk_skb: 7 callbacks suppressed [ 30.474436] audit: type=1800 audit(1542302823.854:29): pid=5864 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 [ 30.508806] audit: type=1800 audit(1542302823.854:30): pid=5864 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 '10.128.0.73' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.120684] netlink: 'syz-executor405': attribute type 3 has an invalid length. [ 42.128219] netlink: 'syz-executor405': attribute type 2 has an invalid length. [ 42.136219] WARNING: CPU: 0 PID: 6019 at net/netfilter/nfnetlink_cttimeout.c:478 cttimeout_default_get+0x1df/0xb30 [ 42.146781] Kernel panic - not syncing: panic_on_warn set ... [ 42.152663] CPU: 0 PID: 6019 Comm: syz-executor405 Not tainted 4.20.0-rc2+ #238 [ 42.160089] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.169425] Call Trace: [ 42.171999] dump_stack+0x244/0x39d [ 42.175615] ? dump_stack_print_info.cold.1+0x20/0x20 [ 42.180796] panic+0x2ad/0x55c [ 42.183977] ? add_taint.cold.5+0x16/0x16 [ 42.188113] ? __warn.cold.8+0x5/0x45 [ 42.191894] ? __warn+0xe8/0x1d0 [ 42.195246] ? cttimeout_default_get+0x1df/0xb30 [ 42.199987] __warn.cold.8+0x20/0x45 [ 42.203685] ? rcu_softirq_qs+0x20/0x20 [ 42.207644] ? cttimeout_default_get+0x1df/0xb30 [ 42.212390] report_bug+0x254/0x2d0 [ 42.216003] do_error_trap+0x11b/0x200 [ 42.219879] do_invalid_op+0x36/0x40 [ 42.223576] ? cttimeout_default_get+0x1df/0xb30 [ 42.228318] invalid_op+0x14/0x20 [ 42.231778] RIP: 0010:cttimeout_default_get+0x1df/0xb30 [ 42.237126] 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 [ 42.256014] RSP: 0018:ffff8881c1187260 EFLAGS: 00010293 [ 42.261360] RAX: ffff8881c0f4c700 RBX: ffffffff88bf58e0 RCX: ffffffff865e961c [ 42.268628] RDX: 0000000000000000 RSI: ffffffff865e964f RDI: 0000000000000001 [ 42.275879] RBP: ffff8881c1187370 R08: ffff8881c0f4c700 R09: ffffed103b5c5b67 [ 42.283132] R10: 0000000000000002 R11: ffff8881dae2db3b R12: 0000000000000088 [ 42.290390] R13: ffff8881bdd96c80 R14: 0000000000000017 R15: 0000000000000088 [ 42.297652] ? cttimeout_default_get+0x1ac/0xb30 [ 42.302390] ? cttimeout_default_get+0x1df/0xb30 [ 42.307135] ? lock_downgrade+0x900/0x900 [ 42.311268] ? check_preemption_disabled+0x48/0x280 [ 42.316272] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 42.321013] ? __lock_is_held+0xb5/0x140 [ 42.325061] ? cttimeout_new_timeout+0x8c0/0x8c0 [ 42.329805] nfnetlink_rcv_msg+0xdd3/0x10c0 [ 42.334120] ? nfnetlink_bind+0x3b0/0x3b0 [ 42.338257] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.343782] ? refcount_sub_and_test_checked+0x203/0x310 [ 42.349219] ? refcount_inc_not_zero_checked+0x2f0/0x2f0 [ 42.354657] ? netlink_deliver_tap+0x32e/0xf80 [ 42.359224] ? lock_downgrade+0x900/0x900 [ 42.363355] ? check_preemption_disabled+0x48/0x280 [ 42.368357] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.373880] ? apparmor_capable+0x355/0x6c0 [ 42.378185] ? rcu_softirq_qs+0x20/0x20 [ 42.382141] ? apparmor_cred_transfer+0x590/0x590 [ 42.386975] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.392682] netlink_rcv_skb+0x172/0x440 [ 42.396729] ? nfnetlink_bind+0x3b0/0x3b0 [ 42.400858] ? netlink_ack+0xb80/0xb80 [ 42.404733] ? __netlink_ns_capable+0x100/0x130 [ 42.409387] nfnetlink_rcv+0x1c0/0x4d0 [ 42.413259] ? nfnetlink_rcv_batch+0x19b0/0x19b0 [ 42.418001] ? kasan_check_write+0x14/0x20 [ 42.422222] netlink_unicast+0x5a5/0x760 [ 42.426273] ? netlink_attachskb+0x9a0/0x9a0 [ 42.430665] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.436203] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.441226] netlink_sendmsg+0xa18/0xfc0 [ 42.445273] ? move_addr_to_kernel.part.18+0xc6/0x100 [ 42.450452] ? netlink_unicast+0x760/0x760 [ 42.454670] ? aa_sock_msg_perm.isra.14+0xba/0x160 [ 42.459584] ? apparmor_socket_sendmsg+0x29/0x30 [ 42.464325] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.469845] ? security_socket_sendmsg+0x94/0xc0 [ 42.474583] ? netlink_unicast+0x760/0x760 [ 42.478802] sock_sendmsg+0xd5/0x120 [ 42.482505] ___sys_sendmsg+0x7fd/0x930 [ 42.486484] ? vmf_insert_mixed_mkwrite+0x40/0x40 [ 42.491312] ? copy_msghdr_from_user+0x580/0x580 [ 42.496052] ? __fd_install+0x2b5/0x8f0 [ 42.500009] ? lock_downgrade+0x900/0x900 [ 42.504143] ? zap_class+0x640/0x640 [ 42.507841] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.513363] ? __fget_light+0x2e9/0x430 [ 42.517318] ? fget_raw+0x20/0x20 [ 42.520765] ? __do_page_fault+0x620/0xe60 [ 42.524995] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.530517] ? sockfd_lookup_light+0xc5/0x160 [ 42.534996] __sys_sendmsg+0x11d/0x280 [ 42.538867] ? __ia32_sys_shutdown+0x80/0x80 [ 42.543263] ? up_read+0x225/0x2c0 [ 42.546790] ? do_fast_syscall_32+0x150/0xfb2 [ 42.551265] ? do_fast_syscall_32+0x150/0xfb2 [ 42.555750] ? trace_hardirqs_off_caller+0x310/0x310 [ 42.560838] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.566360] ? __do_page_fault+0x491/0xe60 [ 42.570584] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 42.575325] do_fast_syscall_32+0x34d/0xfb2 [ 42.579632] ? do_int80_syscall_32+0x890/0x890 [ 42.584255] ? entry_SYSENTER_compat+0x68/0x7f [ 42.588820] ? trace_hardirqs_off_caller+0xbb/0x310 [ 42.593818] ? syscall_return_slowpath+0x5e0/0x5e0 [ 42.598730] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.603555] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.608383] ? trace_hardirqs_on_caller+0x310/0x310 [ 42.613383] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 42.618382] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.623902] ? prepare_exit_to_usermode+0x291/0x3b0 [ 42.628903] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.633733] entry_SYSENTER_compat+0x70/0x7f [ 42.638125] RIP: 0023:0xf7f37a29 [ 42.641474] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 42.660358] RSP: 002b:00000000ff8ba1dc EFLAGS: 00000213 ORIG_RAX: 0000000000000172 [ 42.668050] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dddfc8 [ 42.675300] RDX: 0000000000000000 RSI: 00000000080ea078 RDI: 00000000ff8ba230 [ 42.682562] RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000 [ 42.689854] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 42.697106] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 42.705344] Kernel Offset: disabled [ 42.709012] Rebooting in 86400 seconds..