I think I've found the pool bug.  try applying this patch and
let me know if the problem goes away.

-Chuck


diff -u -r1.21 subr_pool.c
--- subr_pool.c	1999/03/31 23:23:48	1.21
+++ subr_pool.c	1999/04/04 00:45:30
@@ -254,6 +254,11 @@
 	pp->pr_npages--;
 	pp->pr_npagefree++;
 
+	if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
+		LIST_REMOVE(ph, ph_hashlist);
+		pool_put(&phpool, ph);
+	}
+
 	if (pp->pr_curpage == ph) {
 		/*
 		 * Find a new non-empty page header, if any.
@@ -267,11 +272,6 @@
 
 		pp->pr_curpage = ph;
 	}
-
-	if ((pp->pr_roflags & PR_PHINPAGE) == 0) {
-		LIST_REMOVE(ph, ph_hashlist);
-		pool_put(&phpool, ph);
-	}
 }
 
 /*