[....] 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. [ 29.342692] kauditd_printk_skb: 7 callbacks suppressed [ 29.342706] audit: type=1800 audit(1543161867.153:29): pid=5873 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 29.367204] audit: type=1800 audit(1543161867.163:30): pid=5873 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 '10.128.0.84' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.784675] [ 39.786365] ==================================== [ 39.791100] WARNING: syz-executor330/6030 still has locks held! [ 39.797225] 4.20.0-rc3+ #127 Not tainted [ 39.801296] ------------------------------------ [ 39.806301] 1 lock held by syz-executor330/6030: [ 39.811054] #0: 00000000402d47d7 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds+0x53/0x120 [ 39.820263] [ 39.820263] stack backtrace: [ 39.824770] CPU: 1 PID: 6030 Comm: syz-executor330 Not tainted 4.20.0-rc3+ #127 [ 39.832210] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.841580] Call Trace: [ 39.844150] dump_stack+0x244/0x39d [ 39.847861] ? dump_stack_print_info.cold.1+0x20/0x20 [ 39.853040] ? vprintk_func+0x85/0x181 [ 39.856934] debug_check_no_locks_held.cold.49+0x93/0x9f [ 39.862366] flush_old_exec+0x1ea2/0x2480 [ 39.866495] ? save_stack+0x43/0xd0 [ 39.870101] ? __kmalloc+0x15b/0x760 [ 39.873793] ? copy_strings_kernel+0x110/0x110 [ 39.878387] ? iov_iter_init+0xe5/0x210 [ 39.882345] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 39.887863] ? __vfs_read+0x11f/0x9b0 [ 39.891645] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.897164] ? fsnotify+0x50e/0xef0 [ 39.900787] ? fsnotify+0xef0/0xef0 [ 39.904402] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 39.909946] ? fsnotify_first_mark+0x350/0x350 [ 39.914507] ? __fsnotify_parent+0xcc/0x430 [ 39.918817] ? fsnotify+0xef0/0xef0 [ 39.922471] ? rw_verify_area+0x118/0x360 [ 39.926616] ? vfs_read+0x1ce/0x3c0 [ 39.930221] ? kernel_read+0xab/0x120 [ 39.933997] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 39.938991] ? load_elf_phdrs+0x1cd/0x260 [ 39.943118] ? writenote+0x3d0/0x3d0 [ 39.946808] ? lock_downgrade+0x900/0x900 [ 39.950950] load_elf_binary+0xa39/0x5620 [ 39.955106] ? find_held_lock+0x36/0x1c0 [ 39.959159] ? notesize.isra.6+0x80/0x80 [ 39.963223] ? ima_file_mmap+0x160/0x160 [ 39.967266] ? lock_downgrade+0x900/0x900 [ 39.971397] ? kasan_check_write+0x14/0x20 [ 39.975630] search_binary_handler+0x17d/0x570 [ 39.980195] __do_execve_file.isra.33+0x1661/0x25d0 [ 39.985196] ? prepare_bprm_creds+0x120/0x120 [ 39.989676] ? usercopy_warn+0x110/0x110 [ 39.993724] ? check_preemption_disabled+0x48/0x280 [ 39.998731] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 40.004260] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.009798] ? strncpy_from_user+0x411/0x5a0 [ 40.014191] ? digsig_verify+0x1530/0x1530 [ 40.018423] ? kmem_cache_alloc+0x33a/0x730 [ 40.022736] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 40.027331] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.032879] __x64_sys_execveat+0xed/0x130 [ 40.037098] do_syscall_64+0x1b9/0x820 [ 40.040965] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.046325] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.051241] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.056108] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.061112] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.066125] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.071169] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.075993] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.081176] RIP: 0033:0x4457d9 [ 40.084351] 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 [ 40.103249] RSP: 002b:00007f29c0461db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 [ 40.110949] RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 00000000004457d9 [ 40.118210] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 [ 40.125458] RBP: 00000000006dac20 R08: 0000000000001000 R09: 0000000000000000 [ 40.132711] R10: 0000000000000000 R11: