diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 4c7b1e7bfd..cd984929a6 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -888,7 +888,6 @@ RemoveSocketFiles(void)
 		(void) unlink(sock_path);
 	}
 	/* Since we're about to exit, no need to reclaim storage */
-	sock_paths = NIL;
 }
 
 
diff --git a/src/backend/utils/cache/catcache.c b/src/backend/utils/cache/catcache.c
index 55c9445898..2abdd44190 100644
--- a/src/backend/utils/cache/catcache.c
+++ b/src/backend/utils/cache/catcache.c
@@ -814,7 +814,7 @@ InitCatCache(int id,
 	 * Note: we rely on zeroing to initialize all the dlist headers correctly
 	 */
 	sz = sizeof(CatCache) + PG_CACHE_LINE_SIZE;
-	cp = (CatCache *) CACHELINEALIGN(palloc0(sz));
+	cp = (CatCache *) palloc0(sz);
 	cp->cc_bucket = palloc0(nbuckets * sizeof(dlist_head));
 
 	/*
diff --git a/src/backend/utils/hash/dynahash.c b/src/backend/utils/hash/dynahash.c
index 6546e3c7c7..df39bc77df 100644
--- a/src/backend/utils/hash/dynahash.c
+++ b/src/backend/utils/hash/dynahash.c
@@ -1713,6 +1713,10 @@ element_alloc(HTAB *hashp, int nelem, int freelist_idx)
 	if (hashp->isfixed)
 		return false;
 
+	/* Force separate allocations to de-confuse valgrind */
+	if (!hashp->isshared)
+		nelem = 1;
+
 	/* Each element has a HASHELEMENT header plus user data. */
 	elementSize = MAXALIGN(sizeof(HASHELEMENT)) + MAXALIGN(hctl->entrysize);
 
diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c
index 8b73850d0d..be37e8b312 100644
--- a/src/backend/utils/init/miscinit.c
+++ b/src/backend/utils/init/miscinit.c
@@ -944,7 +944,6 @@ UnlinkLockFiles(int status, Datum arg)
 		/* Should we complain if the unlink fails? */
 	}
 	/* Since we're about to exit, no need to reclaim storage */
-	lock_files = NIL;
 
 	/*
 	 * Lock file removal should always be the last externally visible action
diff --git a/src/backend/utils/misc/ps_status.c b/src/backend/utils/misc/ps_status.c
index 5819faaf2d..2d0ef37f7f 100644
--- a/src/backend/utils/misc/ps_status.c
+++ b/src/backend/utils/misc/ps_status.c
@@ -113,6 +113,11 @@ static size_t ps_buffer_fixed_size; /* size of the constant prefix */
 static int	save_argc;
 static char **save_argv;
 
+/* We use this to convince Valgrind that replacement environ is referenced */
+#ifdef PS_USE_CLOBBER_ARGV
+static char ** volatile fake_environ;
+#endif
+
 
 /*
  * Call this early in startup to save the original argc/argv values.
@@ -192,6 +197,8 @@ save_ps_display_args(int argc, char **argv)
 		}
 		new_environ[i] = NULL;
 		environ = new_environ;
+		/* Valgrind tends to think this memory is leaked, so fool it */
+		fake_environ = new_environ;
 	}
 #endif							/* PS_USE_CLOBBER_ARGV */
 
diff --git a/src/include/postmaster/bgworker_internals.h b/src/include/postmaster/bgworker_internals.h
index fc7706314b..f32a13f786 100644
--- a/src/include/postmaster/bgworker_internals.h
+++ b/src/include/postmaster/bgworker_internals.h
@@ -32,6 +32,7 @@
  */
 typedef struct RegisteredBgWorker
 {
+	slist_node	rw_lnode;		/* list link (first to placate valgrind) */
 	BackgroundWorker rw_worker; /* its registry entry */
 	struct bkend *rw_backend;	/* its BackendList entry, or NULL */
 	pid_t		rw_pid;			/* 0 if not running */
@@ -39,7 +40,6 @@ typedef struct RegisteredBgWorker
 	TimestampTz rw_crashed_at;	/* if not 0, time it last crashed */
 	int			rw_shmem_slot;
 	bool		rw_terminate;
-	slist_node	rw_lnode;		/* list link */
 } RegisteredBgWorker;
 
 extern slist_head BackgroundWorkerList;
diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index ddc2762eb3..4f2e631562 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -85,6 +85,13 @@ typedef struct catcache
 
 typedef struct catctup
 {
+	/*
+	 * Each tuple in a cache is a member of a dlist that stores the elements
+	 * of its hash bucket.  We keep each dlist in LRU order to speed repeated
+	 * lookups.
+	 */
+	dlist_node	cache_elem;		/* list member of per-bucket list */
+
 	int			ct_magic;		/* for identifying CatCTup entries */
 #define CT_MAGIC   0x57261502
 
@@ -96,13 +103,6 @@ typedef struct catctup
 	 */
 	Datum		keys[CATCACHE_MAXKEYS];
 
-	/*
-	 * Each tuple in a cache is a member of a dlist that stores the elements
-	 * of its hash bucket.  We keep each dlist in LRU order to speed repeated
-	 * lookups.
-	 */
-	dlist_node	cache_elem;		/* list member of per-bucket list */
-
 	/*
 	 * A tuple marked "dead" must not be returned by subsequent searches.
 	 * However, it won't be physically deleted from the cache until its
@@ -156,13 +156,13 @@ typedef struct catctup
  */
 typedef struct catclist
 {
+	dlist_node	cache_elem;		/* list member of per-catcache list */
+
 	int			cl_magic;		/* for identifying CatCList entries */
 #define CL_MAGIC   0x52765103
 
 	uint32		hash_value;		/* hash value for lookup keys */
 
-	dlist_node	cache_elem;		/* list member of per-catcache list */
-
 	/*
 	 * Lookup keys for the entry, with the first nkeys elements being valid.
 	 * All by-reference are separately allocated.