[....] 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. [ 29.700287] kauditd_printk_skb: 7 callbacks suppressed [ 29.700299] audit: type=1800 audit(1543896872.272:29): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 29.728571] audit: type=1800 audit(1543896872.272:30): pid=5898 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.10.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.586458] [ 40.588118] ==================================== [ 40.592858] WARNING: syz-executor286/6054 still has locks held! [ 40.599288] 4.20.0-rc5+ #141 Not tainted [ 40.603345] ------------------------------------ [ 40.608177] 1 lock held by syz-executor286/6054: [ 40.612959] #0: 000000009ccdb9e0 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 [ 40.622176] [ 40.622176] stack backtrace: [ 40.626781] CPU: 0 PID: 6054 Comm: syz-executor286 Not tainted 4.20.0-rc5+ #141 [ 40.634221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.643559] Call Trace: [ 40.646140] dump_stack+0x244/0x39d [ 40.649757] ? dump_stack_print_info.cold.1+0x20/0x20 [ 40.654954] ? vprintk_func+0x85/0x181 [ 40.658840] debug_check_no_locks_held.cold.49+0x93/0x9f [ 40.664291] flush_old_exec+0x1ea2/0x2480 [ 40.668441] ? save_stack+0x43/0xd0 [ 40.672085] ? __kmalloc+0x15b/0x760 [ 40.675794] ? copy_strings_kernel+0x110/0x110 [ 40.680368] ? iov_iter_init+0xe5/0x210 [ 40.684335] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.689868] ? __vfs_read+0x11f/0x9b0 [ 40.693659] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.699191] ? fsnotify+0x50e/0xef0 [ 40.702840] ? fsnotify+0xef0/0xef0 [ 40.706456] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.711987] ? fsnotify_first_mark+0x350/0x350 [ 40.716570] ? __fsnotify_parent+0xcc/0x430 [ 40.720883] ? fsnotify+0xef0/0xef0 [ 40.724502] ? rw_verify_area+0x118/0x360 [ 40.728640] ? vfs_read+0x1ce/0x3c0 [ 40.732258] ? kernel_read+0xab/0x120 [ 40.736051] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.741058] ? load_elf_phdrs+0x1e4/0x270 [ 40.745199] ? writenote+0x3d0/0x3d0 [ 40.748908] ? __kasan_slab_free+0x119/0x150 [ 40.753368] load_elf_binary+0xa9a/0x5cf0 [ 40.757521] ? find_held_lock+0x36/0x1c0 [ 40.761579] ? notesize.isra.6+0x80/0x80 [ 40.765628] ? ima_file_mmap+0x160/0x160 [ 40.769687] ? lock_downgrade+0x900/0x900 [ 40.773834] ? kasan_check_write+0x14/0x20 [ 40.778064] search_binary_handler+0x17d/0x570 [ 40.782638] __do_execve_file.isra.33+0x1661/0x25d0 [ 40.787647] ? prepare_bprm_creds+0x120/0x120 [ 40.792135] ? usercopy_warn+0x110/0x110 [ 40.796191] ? check_preemption_disabled+0x48/0x280 [ 40.801209] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 40.806738] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.812267] ? strncpy_from_user+0x411/0x5a0 [ 40.816671] ? digsig_verify+0x1530/0x1530 [ 40.820931] ? kmem_cache_alloc+0x33a/0x730 [ 40.825283] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 40.829856] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.835388] __x64_sys_execveat+0xed/0x130 [ 40.839619] do_syscall_64+0x1b9/0x820 [ 40.843496] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.848850] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.853808] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.858645] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.863650] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.868659] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.873667] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.878500] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.883678] RIP: 0033:0x445789 [ 40.886862] Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.905750] RSP: 002b:00007f30e3e86db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 40.913446] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000445789 [ 40.920707] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 [ 40.927988] RBP: 00000000006dac20 R08: 0000000000001000 R09: 0000000000000000 [ 40.935246] R10: 0000000000000