.

wcfs/client/wcfs.cpp

@@ -811,7 +811,12 @@ error _FileH::close() {
     _FileH& fileh = *this;
     Conn    wconn = fileh.wconn;
 
-    // XXX virt_lock + explain (refer to __pin1)
+    // lock virtmem first. TODO more granular virtmem locking (see __pin1 for
+    // details and why virt_lock currently goes first)
+    virt_lock();
+    defer([&]() {
+        virt_unlock();
+    });
 
     wconn->_atMu.RLock();
     wconn->_filehMu.Lock();