Peter, Charles, I understand that you're doing a difficult bug hunt here, and 6/7 is the only unapplied patch of this series (right?). I've looked at 6/7 again, and conclude that it has a low chance of regressing.
If it makes things easier for you, then I'm fine with you going ahead and applying the patch. Secondly, I can help with unsupervised git bisect if you need. In <http://lists.gnu.org/archive/html/bug-libtool/2010-09/msg00006.html>, I posted a bisect script for a slightly different bug; for your case, you should adjust reconfdirs (for efficiency) and TESTS and the failure grep. In the 'git bisect start' command line, you need to specify one known-bad and one known-good revision. Last but not least, IIUC then you've complained about possibly multiple failures masking. Is this specifically about the stresstest? To alleviate this in the future, we can modify stresstest to fan it out into several test groups (so separate issues have a higher chance of producing separate failures), or modify it so it runs all tests (even if some failed earier) and summarizes the failing instances at the end. Suggestions? Thanks, Ralf