Why did it take a long time to track down the bug? You had a test case which triggered it, so in theory just running under valgrind would have been enough. Or

Why did it take a long time to track down the bug? You had a test case which triggered it, so in theory just running under valgrind would have been enough. Or did it not happen in that case? I'm not even gonna comment on the rewrite, that reads like an ad. :-)