diff -r cb65d4b7e429 -r b63dee7bd0d9 mercurial/util.py
--- a/mercurial/util.py	Tue Sep 18 16:45:13 2018 -0700
+++ b/mercurial/util.py	Tue Sep 18 16:47:09 2018 -0700
@@ -3448,7 +3448,7 @@
         The object has a ``decompress(data)`` method that decompresses
         data. The method will only be called if ``data`` begins with
         ``revlogheader()``. The method should return the raw, uncompressed
-        data or raise a ``RevlogError``.
+        data or raise a ``StorageError``.
 
         The object is reusable but is not thread safe.
         """
@@ -3626,8 +3626,8 @@
             try:
                 return zlib.decompress(data)
             except zlib.error as e:
-                raise error.RevlogError(_('revlog decompress error: %s') %
-                                        stringutil.forcebytestr(e))
+                raise error.StorageError(_('revlog decompress error: %s') %
+                                         stringutil.forcebytestr(e))
 
     def revlogcompressor(self, opts=None):
         return self.zlibrevlogcompressor()
@@ -3838,8 +3838,8 @@
 
                 return ''.join(chunks)
             except Exception as e:
-                raise error.RevlogError(_('revlog decompress error: %s') %
-                                        stringutil.forcebytestr(e))
+                raise error.StorageError(_('revlog decompress error: %s') %
+                                         stringutil.forcebytestr(e))
 
     def revlogcompressor(self, opts=None):
         opts = opts or {}