diff --git a/src/lisp/lispbugs b/src/lisp/lispbugs
new file mode 100644
index 0000000..67ac030
--- /dev/null
+++ b/src/lisp/lispbugs
@@ -0,0 +1,8 @@
+BUG: "random" segfault in lisp (gc) calls.
+
+Theory: the values we're walking on the stack are garbage, i.e. coming
+from C.
+
+Looks like the GCSegments code got lost, I need to readd that and it
+should fix this. `eval' in `compiler.dasc' is getting it's local
+variables inspected by _do_gc.
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