https://bugs.freedesktop.org/show_bug.cgi?id=74539
--- Comment #10 from Chris Rankin rankincj@googlemail.com --- (In reply to comment #9)
valgrind: failed to start tool 'memcheck' for platform 'amd64-linux': No such file or directory
More specifically: Valgrind is falling back to the x86_64 platform when executing the "--trace-children=yes" option!