I've hit this exception while playing with miasm (commit @1e994249defba6024c48796443a66889466b5326). A repro is attached to this issue (c11e3b1ad4810e7c2e7294f198ebe4b8-python.zip) (you can grab the ...
My impression is that, although this test could have been useful in the past (mainly for debugging purposes), at this point we can comment it out if it is creating issues with PyPy and recent versions ...