From 5d85fdb2c58d1b3988ff07ac6d4feaaa7ddbaab1 Mon Sep 17 00:00:00 2001
From: Reid Horuff <reidhoruff@gmail.com>
Date: Tue, 31 May 2016 12:26:48 -0700
Subject: [PATCH] add missing lock

---
 db/db_impl.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/db/db_impl.cc b/db/db_impl.cc
index 8d86691d6..4896d82ba 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -676,6 +676,7 @@ void DBImpl::MarkLogAsContainingPrepSection(uint64_t log) {
 }
 
 uint64_t DBImpl::FindMinLogContainingOutstandingPrep() {
+  std::lock_guard<std::mutex> lock(prep_heap_mutex_);
   uint64_t min_log = 0;
 
   // first we look in the prepared heap where we keep