Hello,
For some weeks now, the PHPUnit tests for MediaWiki core have been randomly failing with an 'exit code 139' error. I did not bother investigating it caused I had no clue about what would cause it and it happened mostly in the 1.21wmf7 branch, not master.
The mighty Tim Starling found out the root cause which is due to a bug in PHP. Tim applied a workaround to our PHPUnit installation to avoid the segfaulting code path.
If you have any patchset blocked by the exit code 139, you can reattempt a merge of it by revoting CR+2 or sending a rebased patchset.
Our bug (with MediaWiki backtraces) https://bugzilla.wikimedia.org/show_bug.cgi?id=43972
Upstream bug: https://bugs.php.net/bug.php?id=63055
cheers,