diff -r 6446e9b37c8b -r e7222d326ea2 mercurial/revlog.py
--- a/mercurial/revlog.py	Tue Jan 05 19:51:51 2016 -0800
+++ b/mercurial/revlog.py	Sun Nov 22 17:57:35 2015 -0800
@@ -1122,15 +1122,8 @@
         l = []
         ladd = l.append
 
-        # preload the cache
         try:
-            while True:
-                # ensure that the cache doesn't change out from under us
-                _cache = self._chunkcache
-                self._chunkraw(revs[0], revs[-1], df=df)[1]
-                if _cache == self._chunkcache:
-                    break
-            offset, data = _cache
+            offset, data = self._chunkraw(revs[0], revs[-1], df=df)
         except OverflowError:
             # issue4215 - we can't cache a run of chunks greater than
             # 2G on Windows