Index: src/pcache1.c
==================================================================
--- src/pcache1.c
+++ src/pcache1.c
@@ -226,11 +226,13 @@
     ** it from sqlite3Malloc instead.
     */
     p = sqlite3Malloc(nByte);
     if( p ){
       int sz = sqlite3MallocSize(p);
+      sqlite3_mutex_enter(pcache1.mutex);
       sqlite3StatusAdd(SQLITE_STATUS_PAGECACHE_OVERFLOW, sz);
+      sqlite3_mutex_leave(pcache1.mutex);
     }
     sqlite3MemdebugSetType(p, MEMTYPE_PCACHE);
   }
   return p;
 }