Adds logs for silent exceptions thrown in tasks.

src/ZoneTree/Segments/MutableSegment.cs

@@ -166,14 +166,21 @@ public class MutableSegment<TKey, TValue> : IMutableSegment<TKey, TValue>
         Task.Factory.StartNew(FreezeWriteAheadLog);
     }
 
-    private void FreezeWriteAheadLog()
+    void FreezeWriteAheadLog()
     {
-        while (WritesInProgress > 0)
+        try
         {
-            Thread.Yield();
+            while (WritesInProgress > 0)
+            {
+                Thread.Yield();
+            }
+            WriteAheadLog.MarkFrozen();
+            BTree.SetTreeReadOnlyAndLockFree();
+        }
+        catch(Exception e)
+        {
+            Options.Logger.LogError(e);
         }
-        WriteAheadLog.MarkFrozen();
-        BTree.SetTreeReadOnlyAndLockFree();
     }
 
     public void Drop()

src/ZoneTree/WAL/CompressedFileSystemWriteAheadLog.cs

@@ -254,7 +254,14 @@ public sealed class CompressedFileSystemWriteAheadLog<TKey, TValue> : IWriteAhea
     {
         Task.Run(() =>
         {
-            FileStream.Dispose();
+            try
+            {
+                FileStream.Dispose();
+            }
+            catch(Exception e)
+            {
+                Logger.LogError(e);
+            }
         });
     }
 

src/ZoneTree/WAL/FileSystemWriteAheadLog.cs

@@ -268,7 +268,14 @@ public sealed class FileSystemWriteAheadLog<TKey, TValue> : IWriteAheadLog<TKey,
     {
         Task.Run(() =>
         {
-            Dispose();
+            try
+            {
+                Dispose();
+            }
+            catch (Exception e)
+            {
+                Logger.LogError(e);
+            }
         });
     }
 

src/ZoneTree/WAL/LazyFileSystemWriteAheadLog.cs

@@ -310,9 +310,15 @@ public sealed class LazyFileSystemWriteAheadLog<TKey, TValue> : IWriteAheadLog<T
     {
         Task.Run(() =>
         {
-            StopWriter(true);
-            FileStream.WriteTail();
-            FileStream.Dispose();
+            try
+            {
+                StopWriter(true);
+                FileStream.Dispose();
+            }
+            catch (Exception e)
+            {
+                Logger.LogError(e);
+            }
         });
     }