Index: src/btree.c
==================================================================
--- src/btree.c
+++ src/btree.c
@@ -520,10 +520,11 @@
       }
 
       pMap->aRollback[pMap->nRollback].pgno = pgno;
       pMap->aRollback[pMap->nRollback].parent = pMap->aPtr[iEntry].parent;
       pMap->aRollback[pMap->nRollback].eType = pMap->aPtr[iEntry].eType;
+      pMap->nRollback++;
     }
 
     /* Update the aPtr[] array */
     pMap->aPtr[iEntry].parent = parent;
     pMap->aPtr[iEntry].eType = eType;
@@ -536,11 +537,11 @@
 **
 ** Open savepoint iSavepoint, if it is not already open.
 */
 static int btreePtrmapBegin(BtShared *pBt, int nSvpt){
   BtreePtrmap *pMap = pBt->pMap;
-  if( pMap && nSvpt<pMap->nSvpt ){
+  if( pMap && nSvpt>pMap->nSvpt ){
     int i;
     if( nSvpt>=pMap->nSvptAlloc ){
       int nNew = pMap->nSvptAlloc ? pMap->nSvptAlloc*2 : 16;
       int *aNew = sqlite3_realloc(pMap->aSvpt, sizeof(int) * nNew);
       if( aNew==0 ){

ADDED   test/concurrent4.test
Index: test/concurrent4.test
==================================================================
--- /dev/null
+++ test/concurrent4.test
@@ -0,0 +1,48 @@
+# 2017 May 26
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# Miscellaneous tests for transactions started with BEGIN CONCURRENT. 
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+source $testdir/lock_common.tcl
+source $testdir/wal_common.tcl
+set ::testprefix concurrent4
+
+ifcapable !concurrent {
+  finish_test
+  return
+}
+
+do_execsql_test 1.0 {
+  PRAGMA journal_mode = wal;
+  CREATE TABLE t1(x PRIMARY KEY, y UNIQUE);
+  WITH s(i) AS (SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<100)
+  INSERT INTO t1 SELECT randomblob(400), randomblob(400) FROM s;
+  DELETE FROM t1 WHERE rowid<2;
+} {wal}
+
+do_execsql_test 1.1 {
+  BEGIN CONCURRENT;
+    INSERT INTO t1(rowid, x, y) VALUES(1000, randomblob(3000), randomblob(3000));
+    SAVEPOINT abc;
+    DELETE FROM t1 WHERE rowid = 1000;
+}
+
+do_execsql_test 1.2 { ROLLBACK TO abc }
+do_execsql_test 1.3 { COMMIT }
+do_execsql_test 1.4 { PRAGMA integrity_check } {ok}
+
+
+
+finish_test
+