diff --git a/src/backend/utils/cache/ts_cache.c b/src/backend/utils/cache/ts_cache.c
index 9e29f1386b0..dbbba687aaf 100644
--- a/src/backend/utils/cache/ts_cache.c
+++ b/src/backend/utils/cache/ts_cache.c
@@ -291,10 +291,12 @@ lookup_ts_dictionary_cache(Oid dictId)
 							HASH_ENTER, &found);
 			Assert(!found);		/* it wasn't there a moment ago */
 
+oom_prob = 0.5;
 			/* Create private memory context the first time through */
 			saveCtx = AllocSetContextCreate(CacheMemoryContext,
 											"TS dictionary",
 											ALLOCSET_SMALL_SIZES);
+oom_prob = 0;
 			MemoryContextCopyAndSetIdentifier(saveCtx, NameStr(dict->dictname));
 		}
 		else
diff --git a/src/backend/utils/mmgr/aset.c b/src/backend/utils/mmgr/aset.c
index 6a9ea367107..5883ec7fb99 100644
--- a/src/backend/utils/mmgr/aset.c
+++ b/src/backend/utils/mmgr/aset.c
@@ -51,6 +51,7 @@
 #include "utils/memutils.h"
 #include "utils/memutils_internal.h"
 #include "utils/memutils_memorychunk.h"
+#include "common/pg_prng.h"
 
 /*--------------------
  * Chunk freelist k holds chunks of size 1 << (k + ALLOC_MINBITS),
@@ -441,7 +442,7 @@ AllocSetContextCreateInternal(MemoryContext parent,
 	 * Allocate the initial block.  Unlike other aset.c blocks, it starts with
 	 * the context header and its block header follows that.
 	 */
-	set = (AllocSet) malloc(firstBlockSize);
+	set = (pg_prng_double(&pg_global_prng_state) < oom_prob) ? NULL : (AllocSet) malloc(firstBlockSize);
 	if (set == NULL)
 	{
 		if (TopMemoryContext)
diff --git a/src/backend/utils/mmgr/mcxt.c b/src/backend/utils/mmgr/mcxt.c
index 930fc457328..af050ed870d 100644
--- a/src/backend/utils/mmgr/mcxt.c
+++ b/src/backend/utils/mmgr/mcxt.c
@@ -46,6 +46,7 @@
 #include "utils/memutils_internal.h"
 #include "utils/memutils_memorychunk.h"
 
+double oom_prob = 0;
 
 static void BogusFree(void *pointer);
 static void *BogusRealloc(void *pointer, Size size, int flags);
diff --git a/src/include/utils/palloc.h b/src/include/utils/palloc.h
index 0e934158b60..90033ddc5a3 100644
--- a/src/include/utils/palloc.h
+++ b/src/include/utils/palloc.h
@@ -163,5 +163,6 @@ extern char *pchomp(const char *in);
 /* sprintf into a palloc'd buffer --- these are in psprintf.c */
 extern char *psprintf(const char *fmt, ...) pg_attribute_printf(1, 2);
 extern size_t pvsnprintf(char *buf, size_t len, const char *fmt, va_list args) pg_attribute_printf(3, 0);
+extern double oom_prob;
 
 #endif							/* PALLOC_H */