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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1893Test1.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1893Test1.java
new file mode 100644
index 000000000..7bdc64a52
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1893Test1.java
@@ -0,0 +1,152 @@
+package org.simantics.db.tests.regression.bugs;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.junit.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.request.ReadRequest;
+import org.simantics.db.common.request.ResourceRead;
+import org.simantics.db.common.request.WriteRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.service.ClusterControl;
+import org.simantics.db.testing.base.ExistingDatabaseTest;
+import org.simantics.db.testing.common.TestBase;
+
+public class SimanticsBug1893Test1 extends ExistingDatabaseTest {
+    static int THREAD_COUNT = 2;
+    Session session;
+    Resource testRoot;
+    ClusterControl clusterControl;
+    TestThread[] threads = new TestThread[THREAD_COUNT];
+    AtomicInteger exitCount = new AtomicInteger(0);
+    @Test
+    public void testSimanticsBug1893()
+    throws DatabaseException {
+        session = getSession();
+        for (int i=0; i<THREAD_COUNT; ++i)
+            threads[i] = new TestThread(i);
+        for (int i=0; i<THREAD_COUNT; ++i)
+            threads[i].start();
+        while (exitCount.get() < THREAD_COUNT) {
+            try {
+                Thread.sleep(100); // milliseconds
+            } catch (InterruptedException e) {
+            }
+        }
+        for (int i=0; i<THREAD_COUNT; ++i)
+            if (null != threads[i].exception)
+                throw threads[i].exception;
+        for (int i=0; i<THREAD_COUNT; ++i)
+            while (threads[i].isAlive())
+                try {
+                    Thread.sleep(100); // milliseconds
+                } catch (InterruptedException e) {
+                }
+    }
+    class TestThread extends Thread {
+        TestThread(int i) {
+            super("Test Thread " + i);
+        }
+        DatabaseException exception = null;
+        @Override
+        public void run() {
+            try  {
+                session.syncRequest(new Query());
+            } catch (DatabaseException e) {
+                exception = e;
+            } finally {
+                exitCount.incrementAndGet();
+            }
+        }
+    }
+    class MyResourceRead extends ResourceRead<String> {
+        MyResourceRead(Resource resource) {
+            super(resource);
+        }
+        @Override
+        public String perform(ReadGraph g) throws DatabaseException {
+            if (DEBUG)
+                System.out.println("MyResourceRead");
+            g.getResource("huuhaa");
+            return "huuhaa";
+        }
+        @Override
+        public boolean equals(Object object) {
+            if (this == object)
+                return true;
+            else
+                return false;
+        }
+    }
+    class MyListener implements Listener<String> {
+
+        @Override
+        public void execute(String result) {
+            if (DEBUG)
+                System.out.println("execute=" + result);
+        }
+
+        @Override
+        public void exception(Throwable t) {
+            if (DEBUG)
+                System.out.println("exception=" + t.getMessage());
+        }
+
+        @Override
+        public boolean isDisposed() {
+            return false;
+        }
+        
+    }
+    class TestRequest extends WriteRequest {
+        @Override
+        public void perform(WriteGraph g) throws DatabaseException {
+            for (int i=0; i<THREAD_COUNT; ++i)
+                threads[i] = new TestThread(i);
+            for (int i=0; i<THREAD_COUNT; ++i)
+                threads[i].start();
+            while (exitCount.get() < THREAD_COUNT) {
+                try {
+                    Thread.sleep(100); // milliseconds
+                } catch (InterruptedException e) {
+                }
+            }
+            for (int i=0; i<THREAD_COUNT; ++i)
+                if (null != threads[i].exception)
+                    throw threads[i].exception;
+        }
+    }
+    class TestRequest2 extends ReadRequest {
+        @Override
+        public void run(ReadGraph g) throws DatabaseException {
+            for (int i=0; i<THREAD_COUNT; ++i)
+                threads[i] = new TestThread(i);
+            for (int i=0; i<THREAD_COUNT; ++i)
+                threads[i].start();
+            while (exitCount.get() < THREAD_COUNT) {
+                try {
+                    Thread.sleep(100); // milliseconds
+                } catch (InterruptedException e) {
+                }
+            }
+            for (int i=0; i<THREAD_COUNT; ++i)
+                if (null != threads[i].exception)
+                    throw threads[i].exception;
+        }
+    }
+    class Query extends ReadRequest {
+        @Override
+        public void run(ReadGraph g) throws DatabaseException {
+            Resource rl = g.getResource(TestBase.ROOT_LIBRARY_URI);
+            if (null == rl)
+                fail("Root library resource not found by URI.");
+            if (DEBUG)
+                System.out.println("async request");
+            session.asyncRequest(new MyResourceRead(rl), new MyListener());
+        }
+    }
+}