https://tbpl.mozilla.org/php/getParsedLog.php?id=28423679&tree=Mozilla-Central&full=1#error0 You trace the log back and pymake is processing mochitest installations when it hits the error. This is a legit bug in pymake where it's little brain can't deal with very large amounts of rules. We can work around it by converting "large" directories to use manifests. I performed file counts for directories: 392 ./content/html/content/test 431 ./intl/icu/source/data/coll 437 ./js/src/jit-test/tests/ion 442 ./layout/base/crashtests 455 ./js/src/jit-test/tests/debug 476 ./dom/webidl 503 ./layout/reftests/svg 518 ./layout/generic/crashtests 532 ./dom/tests/mochitest/dom-level1-core 560 ./extensions/spellcheck/hunspell/tests/unit/data 588 ./content/base/test 637 ./layout/reftests/margin-collapsing 642 ./intl/icu/source/data/locales 669 ./dom/tests/mochitest/dom-level2-html 1185 ./js/src/jit-test/tests/basic 3035 ./layout/reftests/bugs We know from the log that dom/tests/mochitest/dom-level1-core completes without issue. Let's convert some directories to manifests to work around this issue.

Convert large directories to mochitest manifests. [test_HTMLDocument12] is a bit wonky. It appears the inactive test filtering in emitter.py isn't working. Will file a bug.

Comment on attachment 810775 [details] [diff] [review] Convert large directories to mochitest manifests Review of attachment 810775 [details] [diff] [review]: ----------------------------------------------------------------- ::: content/base/test/mochitest.ini @@ +305,5 @@ > +[test_bug373181.xhtml] > +[test_bug375314.html] > +[test_bug378969.html] > +[test_bug380418.html] > +[test_bug380418.html^headers^] aren't such files support files?

Alternative hack.

Comment on attachment 810783 [details] [diff] [review] Increase pymake recursion limit (again) Review of attachment 810783 [details] [diff] [review]: ----------------------------------------------------------------- ::: build/pymake/make.py @@ +24,2 @@ > try: > + sys.setrecursionlimit(100000) Can we go for 10000 instead?

https://hg.mozilla.org/mozilla-central/rev/0005c66e4de4 https://hg.mozilla.org/users/bsmedberg_mozilla.com/pymake/rev/498a23902260 With 10000 instead.

The Windows nightly retrigger ran fine. Thanks for the quick fix!