Merge pull request #2693 in HDFFV/hdf5 from ~VCHOI/my_third_fork:bugfix/HDFFV-11080-heap-use-after-free-by-the-call to develop

* commit '3023b34272cc6ada84aebfa7441a6a55afa3621c':
  Update MANIFEST. Add new test to Cmake.
  Fix for jira issue HDFFV-11080: (1) Patch up the file pointer when reading attribute of variable length datatype (2) Test to verify the fix when doing multiple threads

release_docs/RELEASE.txt

@@ -342,6 +342,20 @@ Bug Fixes since HDF5-1.10.5 release
 
     Library
     -------
+    - Fixed the segmentation fault when reading attributes with multiple threads
+
+      It was reported that the reading of attributes with variable length string
+      datatype will crash with segmentation fault particularly when the number of 
+      threads is high (>16 threads).  The problem was due to the file pointer that
+      was set in the variable length string datatype for the attribute.  That file
+      pointer was already closed when the attribute was accessed.
+
+      The problem was fixed by setting the file pointer to the current opened file pointer
+      when the attribute was accessed.  Similar patch up was done before when reading
+      dataset with variable length string datatype.
+
+      (VC - 2020/07/13, HDFFV-11080)
+
     - Fixed CVE-2018-17435
 
       The tool h52gif produced a segfault when the size of an attribute