try to use a pipe for communication

test/run.py

@@ -77,6 +77,7 @@ shutil.copy(os.path.join(
     'bin',
     'zlib.dll'), '.')
 
-testCommand = '{} {}'.format(testBinary, os.getenv('TEST', ''))
+lldb = "lldb --batch -o 'run' -k 'thread backtrace all' -k 'quit 1'"
+testCommand = '{} {} {}'.format(lldb, testBinary, os.getenv('TEST', ''))
 ret = os.system(testCommand)
 assert ret == 0, 'Test command failed'