Update from http://lists.gnu.org/archive/html/guile-user/2017-11/msg00066.html :
---snip--- With gcc-7.2.0 and gcc-6.4.0, both built from source (just guile/configure ... CC=gcc-X.X). - stable-2.2 with 6.4 passes the tests every time. - stable 2.2 with 7.2 fails on test-out-of-memory. Running make check repeatedly I got F F F P F F P P P P F F F F P. ---snip---