https://bugs.freedesktop.org/show_bug.cgi?id=107784
--- Comment #8 from Felix Schwarz felix.schwarz@oss.schwarz.eu --- Bugzilla: The tool which preserves all my stupid errors for eternity. :-/
Sorry, I just read the previous comments and of course you used git bisect already... Still you should test both parents of a merge commit to be sure.
When my git bisect ends at a merge commit, usually I messed up the build during bisection (e.g. running a previous build by mistake).