Index: folly-2019.05.06.00/folly/stats/detail/BufferedStat-defs.h
===================================================================
--- folly-2019.05.06.00.orig/folly/stats/detail/BufferedStat-defs.h
+++ folly-2019.05.06.00/folly/stats/detail/BufferedStat-defs.h
@@ -74,7 +74,6 @@ void BufferedStat<DigestT, ClockT>::doUp
     TimePoint now,
     const std::unique_lock<SharedMutex>& g,
     UpdateMode updateMode) {
-  DCHECK(g.owns_lock());
   // Check that no other thread has performed the slide after the check
   auto oldExpiry = expiry_.load(std::memory_order_relaxed).tp;
   if (now > oldExpiry || updateMode == UpdateMode::Now) {