Fix: Do not release GIL before calling WriteUnraisableNode

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ThreadModuleBuiltins.java

@@ -230,8 +230,8 @@ long start(VirtualFrame frame, Object cls, Object callable, Object args, Object
             // TODO: python thread stack size != java thread stack size
             // ignore setting the stack size for the moment
             TruffleThreadBuilder threadBuilder = env.newTruffleThreadBuilder(() -> {
-                try (GilNode.UncachedAcquire gil = GilNode.uncachedAcquire()) {
-
+                GilNode.UncachedAcquire gil = GilNode.uncachedAcquire();
+                try {
                     // the increment is protected by the gil
                     int curCount = (int) HiddenAttr.ReadNode.executeUncached(threadModule, THREAD_COUNT, 0);
                     HiddenAttr.WriteNode.executeUncached(threadModule, THREAD_COUNT, curCount + 1);
@@ -251,6 +251,8 @@ long start(VirtualFrame frame, Object cls, Object callable, Object args, Object
                         curCount = (int) HiddenAttr.ReadNode.executeUncached(threadModule, THREAD_COUNT, 1);
                         HiddenAttr.WriteNode.executeUncached(threadModule, THREAD_COUNT, curCount - 1);
                     }
+                } finally {
+                    gil.close();
                 }
             }).context(env.getContext()).threadGroup(context.getThreadGroup());