diff --git a/ext/standard/tests/file/open_basedir_cwd_resolve.phpt b/ext/standard/tests/file/open_basedir_cwd_resolve.phpt
index 074a015e1c14..37e783c46abb 100644
--- a/ext/standard/tests/file/open_basedir_cwd_resolve.phpt
+++ b/ext/standard/tests/file/open_basedir_cwd_resolve.phpt
@@ -11,5 +11,5 @@ var_dump(file_get_contents('/some/path/outside/open/basedir'));
 --EXPECTF--
 Warning: file_get_contents(): open_basedir restriction in effect. File(/some/path/outside/open/basedir) is not within the allowed path(s): (%s) in %s on line %d
 
-Warning: file_get_contents(): Failed to open stream: %r(Operation not permitted|Insufficient privileges)%r in %s on line %d
+Warning: file_get_contents(): Failed to open stream: %r(Operation not permitted|Insufficient privileges|Not owner)%r in %s on line %d
 bool(false)
diff --git a/ext/standard/tests/file/realpath_bug77484.phpt b/ext/standard/tests/file/realpath_bug77484.phpt
index 0b78a2aad26f..cbc298d27885 100644
--- a/ext/standard/tests/file/realpath_bug77484.phpt
+++ b/ext/standard/tests/file/realpath_bug77484.phpt
@@ -2,8 +2,8 @@
 Bug #77484 Zend engine crashes when calling realpath in invalid working dir
 --SKIPIF--
 <?php
-if (substr(PHP_OS, 0, 3) == 'WIN' || PHP_OS_FAMILY === 'Solaris') {
-    die("skip can't remove CWD on Windows or Solaris");
+if (substr(PHP_OS, 0, 3) == 'WIN' || PHP_OS_FAMILY === 'Solaris' || PHP_OS_FAMILY == "AIX") {
+    die("skip can't remove CWD on Windows, Solaris, or AIX");
 }
 if (PHP_ZTS) {
     /* TODO eliminate difference in TS build. */
diff --git a/ext/standard/tests/general_functions/getservbyname_basic.phpt b/ext/standard/tests/general_functions/getservbyname_basic.phpt
index db08f8e0c3da..75c17246669c 100644
--- a/ext/standard/tests/general_functions/getservbyname_basic.phpt
+++ b/ext/standard/tests/general_functions/getservbyname_basic.phpt
@@ -10,8 +10,8 @@ Simone Gentili (sensorario@gmail.com)
 if(in_array(PHP_OS_FAMILY, ['BSD', 'Darwin', 'Solaris', 'Linux'])){
     if (!file_exists("/etc/services")) die("skip reason: missing /etc/services");
 }
-if (PHP_OS_FAMILY === 'Solaris') {
-    die("skip Solaris has incomplete /etc/services");
+if (PHP_OS_FAMILY === 'Solaris' || PHP_OS == 'OS400') {
+    die("skip Solaris and IBM i have incomplete /etc/services");
 }
 if (getenv('SKIP_MSAN')) die('skip msan missing interceptor for getservbyname()');
 ?>
diff --git a/ext/standard/tests/general_functions/getservbyport_basic.phpt b/ext/standard/tests/general_functions/getservbyport_basic.phpt
index 817d4fd3ca2c..df5e37cb9f2d 100644
--- a/ext/standard/tests/general_functions/getservbyport_basic.phpt
+++ b/ext/standard/tests/general_functions/getservbyport_basic.phpt
@@ -7,7 +7,7 @@ Michele Orselli (mo@ideato.it)
 Simone Gentili (sensorario@gmail.com)
 --SKIPIF--
 <?php
-if(in_array(PHP_OS_FAMILY, ['BSD', 'Darwin', 'Solaris', 'Linux'])){
+if(in_array(PHP_OS_FAMILY, ['AIX', 'BSD', 'Darwin', 'Solaris', 'Linux'])){
     if (!file_exists("/etc/services")) die("skip reason: missing /etc/services");
 }
 if (getenv('SKIP_MSAN')) die('skip msan missing interceptor for getservbyport()');
diff --git a/ext/standard/tests/general_functions/proc_nice_basic.phpt b/ext/standard/tests/general_functions/proc_nice_basic.phpt
index 107f6d186514..c1568071e5f0 100644
--- a/ext/standard/tests/general_functions/proc_nice_basic.phpt
+++ b/ext/standard/tests/general_functions/proc_nice_basic.phpt
@@ -9,7 +9,9 @@ Simone Gentili (sensorario@gmail.com)
 <?php
 if(!function_exists('proc_nice')) die("skip. proc_nice not available ");
 if(substr(strtoupper(PHP_OS), 0, 3) == 'WIN') die('skip. not for Windows');
-if(PHP_OS_FAMILY === 'Solaris') die('skip Solaris has different nice levels');
+if(PHP_OS_FAMILY === 'Solaris' || PHP_OS_FAMILY == "AIX") {
+	die('skip System V has different nice levels');
+}
 exec('ps -p 1 -o "pid,nice"', $output, $exit_code);
 if ($exit_code !== 0) {
     die("skip ps -p is not available");
diff --git a/ext/standard/tests/general_functions/proc_nice_variation2.phpt b/ext/standard/tests/general_functions/proc_nice_variation2.phpt
index f1f93be221ef..c173b1751339 100644
--- a/ext/standard/tests/general_functions/proc_nice_variation2.phpt
+++ b/ext/standard/tests/general_functions/proc_nice_variation2.phpt
@@ -8,6 +8,10 @@ Simone Gentili (sensorario@gmail.com)
 --SKIPIF--
 <?php
 if(!function_exists('proc_nice')) die("skip. proc_nice not available ");
+
+if (PHP_OS == "OS400") {
+	die("skip: IBM i requires special authority to set niceness");
+}
 ?>
 --FILE--
 <?php
diff --git a/ext/standard/tests/streams/glob-wrapper.phpt b/ext/standard/tests/streams/glob-wrapper.phpt
index 6f5519c60be7..c9da9cc5ef25 100644
--- a/ext/standard/tests/streams/glob-wrapper.phpt
+++ b/ext/standard/tests/streams/glob-wrapper.phpt
@@ -27,7 +27,7 @@ foreach ( [ __DIR__, "glob://".__DIR__ ] as $spec) {
 
 Warning: opendir(): open_basedir restriction in effect. File(%s) is not within the allowed path(s): (/does_not_exist) in %s%eglob-wrapper.php on line 5
 
-Warning: opendir(): Failed to open directory: %r(Operation not permitted|Insufficient privileges)%r in %s%eglob-wrapper.php on line 5
+Warning: opendir(): Failed to open directory: %r(Operation not permitted|Insufficient privileges|Not owner)%r in %s%eglob-wrapper.php on line 5
 Failed to open %s
 ** Opening glob://%s
 No files in glob://%s
diff --git a/ext/standard/tests/strings/setlocale_variation2.phpt b/ext/standard/tests/strings/setlocale_variation2.phpt
index c6d44c4a54c2..5e1ea0f26108 100644
--- a/ext/standard/tests/strings/setlocale_variation2.phpt
+++ b/ext/standard/tests/strings/setlocale_variation2.phpt
@@ -55,6 +55,12 @@ echo "-- Test setlocale() with all available locale in the system --\n";
 // gather all locales installed in the system(stored $all_system_locales),
 // try n set each locale using setlocale() and keep track failures, if any
 foreach($all_system_locales as $value){
+  if (PHP_OS == 'OS400' && str_ends_with($value, ".o")) {
+   // HACK: At least PASE returns locales in "locale -a" that segfault if
+   // loaded; skip them. Bump success count since it's expected at end.
+   $success_count++;
+   continue;
+  }
   //set locale to $value, if success, count increments
   if(setlocale(LC_ALL,$value )){
    $success_count++;