FAIL: test_txn04.test_txn04.test_ops(fix.update.t1r) (subunit.RemotedTestCase)
test_txn04.test_txn04.test_ops(fix.update.t1r)
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_StringException: Traceback (most recent call last):
  File "/mnt/workspace/wiredtiger-test-unit-zseries/test/suite/test_txn04.py", line 191, in test_ops
    self.ops()
  File "/mnt/workspace/wiredtiger-test-unit-zseries/test/suite/test_txn04.py", line 139, in ops
    self.hot_backup(None, committed)
  File "/mnt/workspace/wiredtiger-test-unit-zseries/test/suite/test_txn04.py", line 114, in hot_backup
    self.runWt(cmd.split())
  File "/mnt/workspace/wiredtiger-test-unit-zseries/test/suite/suite_subprocess.py", line 200, in runWt
    str(procargs) + '": exited ' + str(returncode))
  File "/usr/lib64/python2.7/unittest/case.py", line 553, in assertEqual
    assertion_func(first, second, msg=msg)
  File "/usr/lib64/python2.7/unittest/case.py", line 546, in _baseAssertEqual
    raise self.failureException(msg)
AssertionError: expected success: "['/mnt/workspace/wiredtiger-test-unit-zseries/build_posix/wt', '-h', '.', 'backup', './WT_BACKUP']": exited 1