WT-4486, a test case is clearly failing (giving a Python stack trace), but the results.txt file has: passed=True and the directory is removed. This behavior occurs with the -j option, and does not occur without that.
To reproduce in the same way as in
WT-4486, one needs to change test_log03.py to alter the line in test_dirty_max to be:
This was noticed on a non-zseries linux box, but it is the same on regular linux.