From 8b6d0045237663f7bb03cd423b6aff7aa8371086 Mon Sep 17 00:00:00 2001
From: Patrick LeBlanc <patrick.leblanc@mariadb.com>
Date: Thu, 2 Jan 2020 12:16:05 -0500
Subject: [PATCH] Noticed a potential deadlock problem in poolallocator.

---
 utils/common/poolallocator.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/utils/common/poolallocator.cpp b/utils/common/poolallocator.cpp
index da6f7d6c1..170eb2e56 100644
--- a/utils/common/poolallocator.cpp
+++ b/utils/common/poolallocator.cpp
@@ -93,7 +93,11 @@ void PoolAllocator::deallocate(void* p)
     OutOfBandMap::iterator it = oob.find(p);
 
     if (it == oob.end())
+    {
+        if (useLock)
+            lock.store(false, std::memory_order_release);
         return;
+    }
 
     memUsage -= it->second.size;
     oob.erase(it);