.

wcfs/__init__.py

@@ -176,7 +176,7 @@ def _pinner(wconn, ctx):
     # print to stderr as well as by default log does not print to there.
     def _():
         exc = sys.exc_info()[1]
-        if exc is None:
+        if exc in (None, context.canceled): # canceled = .close asks pinner to stop
             return
         log.critical('pinner failed:', exc_info=1)
         print('CRITICAL: pinned failed:', file=sys.stderr)

wcfs/wcfs_test.py

@@ -1768,8 +1768,16 @@ def test_wcfspy_virtmem():
     wconn.resync(at2)
     assert f.pinned == {3:at1}
     tm1.assertBlk(2, 'c2')
+    tm1.assertBlk(3, 'd1')
+
+    # resync at2 -> at3:    #3 must unpin to @head
+    wconn.resync(at3)
+    assert f.pinned == {}
+    tm1.assertBlk(2, 'c2')
     tm1.assertBlk(3, 'd3')
 
+    # XXX resync ↓ ?
+