diff --git a/libraries/liblmdb/CHANGES b/libraries/liblmdb/CHANGES
index 5d921dcb39..b1e9fa8e2b 100644
--- a/libraries/liblmdb/CHANGES
+++ b/libraries/liblmdb/CHANGES
@@ -1,6 +1,14 @@
 LMDB 0.9 Change Log
 
-LMDB 0.9.22 Release (2018-03-22)
+LMDB 0.9.23 Release (2018/12/19)
+	ITS#8756 Fix loose pages in dirty list
+	ITS#8831 Fix mdb_load flag init
+	ITS#8844 Fix mdb_env_close in forked process
+	Documentation
+		ITS#8857 mdb_cursor_del doesn't invalidate cursor
+		ITS#8908 GET_MULTIPLE etc don't change passed in key
+
+LMDB 0.9.22 Release (2018/03/22)
 	Fix MDB_DUPSORT alignment bug (ITS#8819)
 	Fix regression with new db from 0.9.19 (ITS#8760)
 	Fix liblmdb to build on Solaris (ITS#8612)
diff --git a/libraries/liblmdb/lmdb.h b/libraries/liblmdb/lmdb.h
index d99cfe4660..2f25470487 100644
--- a/libraries/liblmdb/lmdb.h
+++ b/libraries/liblmdb/lmdb.h
@@ -200,7 +200,7 @@ typedef int mdb_filehandle_t;
 /** Library minor version */
 #define MDB_VERSION_MINOR	9
 /** Library patch version */
-#define MDB_VERSION_PATCH	22
+#define MDB_VERSION_PATCH	23
 
 /** Combine args a,b,c into a single integer for easy version comparisons */
 #define MDB_VERINT(a,b,c)	(((a) << 24) | ((b) << 16) | (c))
@@ -210,7 +210,7 @@ typedef int mdb_filehandle_t;
 	MDB_VERINT(MDB_VERSION_MAJOR,MDB_VERSION_MINOR,MDB_VERSION_PATCH)
 
 /** The release date of this library version */
-#define MDB_VERSION_DATE	"March 21, 2018"
+#define MDB_VERSION_DATE	"December 19, 2018"
 
 /** A stringifier for the version info */
 #define MDB_VERSTR(a,b,c,d)	"LMDB " #a "." #b "." #c ": (" d ")"
@@ -370,7 +370,7 @@ typedef enum MDB_cursor_op {
 	MDB_GET_BOTH,			/**< Position at key/data pair. Only for #MDB_DUPSORT */
 	MDB_GET_BOTH_RANGE,		/**< position at key, nearest data. Only for #MDB_DUPSORT */
 	MDB_GET_CURRENT,		/**< Return key/data at current cursor position */
-	MDB_GET_MULTIPLE,		/**< Return key and up to a page of duplicate data items
+	MDB_GET_MULTIPLE,		/**< Return up to a page of duplicate data items
 								from current cursor position. Move cursor to prepare
 								for #MDB_NEXT_MULTIPLE. Only for #MDB_DUPFIXED */
 	MDB_LAST,				/**< Position at last key/data item */
@@ -379,7 +379,7 @@ typedef enum MDB_cursor_op {
 	MDB_NEXT,				/**< Position at next data item */
 	MDB_NEXT_DUP,			/**< Position at next data item of current key.
 								Only for #MDB_DUPSORT */
-	MDB_NEXT_MULTIPLE,		/**< Return key and up to a page of duplicate data items
+	MDB_NEXT_MULTIPLE,		/**< Return up to a page of duplicate data items
 								from next cursor position. Move cursor to prepare
 								for #MDB_NEXT_MULTIPLE. Only for #MDB_DUPFIXED */
 	MDB_NEXT_NODUP,			/**< Position at first data item of next key */
@@ -390,7 +390,7 @@ typedef enum MDB_cursor_op {
 	MDB_SET,				/**< Position at specified key */
 	MDB_SET_KEY,			/**< Position at specified key, return key + data */
 	MDB_SET_RANGE,			/**< Position at first key greater than or equal to specified key. */
-	MDB_PREV_MULTIPLE		/**< Position at previous page and return key and up to
+	MDB_PREV_MULTIPLE		/**< Position at previous page and return up to
 								a page of duplicate data items. Only for #MDB_DUPFIXED */
 } MDB_cursor_op;
 
@@ -1510,6 +1510,10 @@ int  mdb_cursor_put(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
 	/** @brief Delete current key/data pair
 	 *
 	 * This function deletes the key/data pair to which the cursor refers.
+	 * This does not invalidate the cursor, so operations such as MDB_NEXT
+	 * can still be used on it.
+	 * Both MDB_NEXT and MDB_GET_CURRENT will return the same record after
+	 * this operation.
 	 * @param[in] cursor A cursor handle returned by #mdb_cursor_open()
 	 * @param[in] flags Options for this operation. This parameter
 	 * must be set to 0 or one of the values described here.
diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index d9e7c5e1eb..e12af4482a 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -3094,10 +3094,41 @@ mdb_freelist_save(MDB_txn *txn)
 		 * we may be unable to return them to me_pghead.
 		 */
 		MDB_page *mp = txn->mt_loose_pgs;
+		MDB_ID2 *dl = txn->mt_u.dirty_list;
+		unsigned x;
 		if ((rc = mdb_midl_need(&txn->mt_free_pgs, txn->mt_loose_count)) != 0)
 			return rc;
-		for (; mp; mp = NEXT_LOOSE_PAGE(mp))
+		for (; mp; mp = NEXT_LOOSE_PAGE(mp)) {
 			mdb_midl_xappend(txn->mt_free_pgs, mp->mp_pgno);
+			/* must also remove from dirty list */
+			if (txn->mt_flags & MDB_TXN_WRITEMAP) {
+				for (x=1; x<=dl[0].mid; x++)
+					if (dl[x].mid == mp->mp_pgno)
+						break;
+				mdb_tassert(txn, x <= dl[0].mid);
+			} else {
+				x = mdb_mid2l_search(dl, mp->mp_pgno);
+				mdb_tassert(txn, dl[x].mid == mp->mp_pgno);
+			}
+			dl[x].mptr = NULL;
+			mdb_dpage_free(env, mp);
+		}
+		{
+			/* squash freed slots out of the dirty list */
+			unsigned y;
+			for (y=1; dl[y].mptr && y <= dl[0].mid; y++);
+			if (y <= dl[0].mid) {
+				for(x=y, y++;;) {
+					while (!dl[y].mptr && y <= dl[0].mid) y++;
+					if (y > dl[0].mid) break;
+					dl[x++] = dl[y++];
+				}
+				dl[0].mid = x-1;
+			} else {
+				/* all slots freed */
+				dl[0].mid = 0;
+			}
+		}
 		txn->mt_loose_pgs = NULL;
 		txn->mt_loose_count = 0;
 	}
@@ -5063,7 +5094,7 @@ mdb_env_close0(MDB_env *env, int excl)
 	if (env->me_fd != INVALID_HANDLE_VALUE)
 		(void) close(env->me_fd);
 	if (env->me_txns) {
-		MDB_PID_T pid = env->me_pid;
+		MDB_PID_T pid = getpid();
 		/* Clearing readers is done in this function because
 		 * me_txkey with its destructor must be disabled first.
 		 *
diff --git a/libraries/liblmdb/mdb_load.c b/libraries/liblmdb/mdb_load.c
index cf1d42e93b..0f177f1ec2 100644
--- a/libraries/liblmdb/mdb_load.c
+++ b/libraries/liblmdb/mdb_load.c
@@ -68,6 +68,7 @@ static void readhdr(void)
 {
 	char *ptr;
 
+	flags = 0;
 	while (fgets(dbuf.mv_data, dbuf.mv_size, stdin) != NULL) {
 		lineno++;
 		if (!strncmp(dbuf.mv_data, "VERSION=", STRLENOF("VERSION="))) {
@@ -374,7 +375,6 @@ int main(int argc, char *argv[])
 	while(!Eof) {
 		MDB_val key, data;
 		int batch = 0;
-		flags = 0;
 
 		if (!dohdr) {
 			dohdr = 1;