diff --git a/sandbox/bad_flush.py b/sandbox/bad_flush.py
new file mode 100644
index 00000000..4a238047
--- /dev/null
+++ b/sandbox/bad_flush.py
@@ -0,0 +1,18 @@
+#!/usr/bin/python3
+import logging
+logger = logging.basicConfig(level=logging.INFO)
+import numpy, pyFAI, pyFAI.azimuthalIntegrator
+method = ("no", "csr", "cython")
+detector = pyFAI.detector_factory("Pilatus_100k")
+ai = pyFAI.azimuthalIntegrator.AzimuthalIntegrator(detector=detector)
+rm = max(detector.shape) * detector.pixel1
+img = numpy.random.random(detector.shape)
+print(ai.integrate1d(img, 5, unit="r_m", radial_range=[0, rm], method=method))
+# print(ai.integrate1d(img, 5, unit="r_m", method=method))
+for k, v in ai.engines.items():
+    print(k, v, id(v.engine))
+
+print(ai.integrate1d(img, 5, unit="r_m", radial_range=[0, rm], method=method))
+# print(ai.integrate1d(img, 5, unit="r_m", method=method))
+for k, v in ai.engines.items():
+    print(k, v, id(v.engine))