diff --git a/src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs b/src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs
index 99272c05f0c2e3..c6da2b1bbc7501 100644
--- a/src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs
+++ b/src/libraries/System.Diagnostics.Process/tests/ProcessTests.Unix.cs
@@ -530,18 +530,17 @@ private static int CheckUserAndGroupIds(string userId, string groupId, string gr
 
             if (bool.Parse(checkGroupsExact))
             {
-                AssertExtensions.Equal(expectedGroups, GetGroups());
+                AssertExtensions.Equal(expectedGroups, GetCurrentUserGroupIds());
             }
             else
             {
-                Assert.Subset(expectedGroups, GetGroups());
+                Assert.Subset(expectedGroups, GetCurrentUserGroupIds());
             }
 
             return RemoteExecutor.SuccessExitCode;
         }
 
         [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/28922", TestPlatforms.AnyUnix)]
         public unsafe void TestCheckChildProcessUserAndGroupIds()
         {
             string userName = GetCurrentRealUserName();
@@ -620,10 +619,17 @@ private static string GetUserGroupId(string username)
         private static string GetUserGroupIds(string username)
         {
             string[] groupIds = StartAndReadToEnd("id", new[] { "-G", username })
-                                    .Split(new[] { ' ', '\n' }, StringSplitOptions.RemoveEmptyEntries);
+                .Split(new[] { ' ', '\n' }, StringSplitOptions.RemoveEmptyEntries);
             return string.Join(",", groupIds.Select(s => uint.Parse(s)).OrderBy(id => id));
         }
 
+        private static HashSet<uint> GetCurrentUserGroupIds()
+        {
+            string[] groupIds = StartAndReadToEnd("id", new[] { "-G" })
+                .Split(new[] { ' ', '\n' }, StringSplitOptions.RemoveEmptyEntries);
+            return new HashSet<uint>(groupIds.Select(s => uint.Parse(s)));
+        }
+
         private static string GetCurrentRealUserName()
         {
             string realUserName = geteuid() == 0 ?
@@ -906,27 +912,6 @@ private static void ChMod(string filename, string mode)
         [DllImport("libc")]
         private static extern uint getgid();
 
-        [DllImport("libc", SetLastError = true)]
-        private static extern unsafe int getgroups(int size, uint* list);
-
-        private static unsafe HashSet<uint> GetGroups()
-        {
-            int maxSize = 128;
-            Span<uint> groups = stackalloc uint[maxSize];
-            fixed (uint* pGroups = groups)
-            {
-                int rv = getgroups(maxSize, pGroups);
-                if (rv == -1)
-                {
-                    // If this throws with EINVAL, maxSize should be increased.
-                    throw new Win32Exception();
-                }
-
-                // Return this as a HashSet to filter out duplicates.
-                return new HashSet<uint>(groups.Slice(0, rv).ToArray());
-            }
-        }
-
         [DllImport("libc")]
         private static extern int seteuid(uint euid);