Well based on what I see here : http://lists.gnu.org/archive/html/bug-guile/2011-03/msg00135.html
.. this is a bug that has been around a while and isn't going away easily. $ ./check-guile threads.test Testing /usr/local/build/guile-2.0.6_2.6.32-5-amd64_002/meta/guile ... threads.test with GUILE_LOAD_PATH=/usr/local/build/guile-2.0.6_2.6.32-5-amd64_002/test-suite Running threads.test FAIL: threads.test: mutex-ownership: mutex with owner not retained (bug #27450) Totals for this test run: passes: 50 failures: 1 unexpected passes: 0 expected failures: 0 unresolved test cases: 0 untested test cases: 0 unsupported test cases: 0 errors: 0 Nope. Not a good result at all. dc