https://tbpl.mozilla.org/?tree=Try&rev=d3de6823f1cd https://tbpl.mozilla.org/php/getParsedLog.php?id=32654588&tree=Try&full=1 My patches do not touch anything under build/ or config/, so I'm not sure where this error is coming from.
I did numerous Valgrind try runs yesterday and saw this once. I see you've retriggered and the second run was green, which is good. So it sounds like something isn't being cleaned up correctly.
It sounds like a non clean mercurial checkout.
I wonder if it's related to bug 957455.
Likely a dupe bug 957455; please reopen if this still occurs now that has been fixed :-)
I don't follow why this is a duplicate, as there's no evidence of hg checkout problem. Instead, this probably a bad parent to push from, eg http://hg.mozilla.org/try/file/d3de6823f1cd/js/src/build/ has no autoconf directory at all.
Ok, that's normal. I'm not sure what went wrong here.