8217475: Unexpected StackOverflowError in "process reaper" thread

Backport-of: a376fb7

Author: Andrew Lu

src/java.base/share/classes/java/lang/ProcessHandleImpl.java

@@ -87,8 +87,12 @@ final class ProcessHandleImpl implements ProcessHandle {
                 ThreadGroup tg = Thread.currentThread().getThreadGroup();
                 while (tg.getParent() != null) tg = tg.getParent();
                 ThreadGroup systemThreadGroup = tg;
+
+                // For a debug build, the stack shadow zone is larger;
+                // Increase the total stack size to avoid potential stack overflow.
+                int debugDelta = "release".equals(System.getProperty("jdk.debug")) ? 0 : (4*4096);
                 final long stackSize = Boolean.getBoolean("jdk.lang.processReaperUseDefaultStackSize")
-                        ? 0 : REAPER_DEFAULT_STACKSIZE;
+                        ? 0 : REAPER_DEFAULT_STACKSIZE + debugDelta;
 
                 ThreadFactory threadFactory = grimReaper -> {
                     Thread t = new Thread(systemThreadGroup, grimReaper,