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From: Christopher Allan Webber <cwebber@dustycloud.org>
Newsgroups: gmane.lisp.guile.devel
Subject: Re: Weak tables harmful to GC?
Date: Sat, 21 Oct 2017 21:20:58 -0500
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Xref: news.gmane.org gmane.lisp.guile.devel:19329
Archived-At: <http://permalink.gmane.org/gmane.lisp.guile.devel/19329>

+      else
+        {
+          /* The move to BDW-GC with Guile 2.0 introduced some bugs
+             related to weak hash tables, threads, memory usage, and the
+             alloc lock.  We were unable to fix these issues
+             satisfactorily in 2.0 but have addressed them via a rewrite
+             in 2.2.  If you see this message often, you probably want
+             to upgrade to 2.2.  */
+          fprintf (stderr, "guile: warning: weak hash table corruption "
+                   "(https://bugs.gnu.org/19180)");
+          len = 0;
+        }

Guess reverting this patch means this comment also should be amended!