Index: src/bitvec.c
==================================================================
--- src/bitvec.c
+++ src/bitvec.c
@@ -169,11 +169,11 @@
 int sqlite3BitvecSet(Bitvec *p, u32 i){
   u32 h;
   if( p==0 ) return SQLITE_OK;
   assert( i>0 );
   assert( i<=p->iSize );
-  if( i>p->iSize ){
+  if( i>p->iSize || i==0 ){
     sqlite3_log(SQLITE_ERROR, 
         "Bitvec: setting bit %d of bitvec size %d\n", (int)i, (int)p->iSize
     );
   }
   i--;

Index: src/pager.c
==================================================================
--- src/pager.c
+++ src/pager.c
@@ -5384,17 +5384,10 @@
     pager_unlock(pPager);
     assert( pPager->eState==PAGER_OPEN );
   }else{
     pPager->eState = PAGER_READER;
     pPager->hasHeldSharedLock = 1;
-#ifndef SQLITE_OMIT_CONCURRENT
-    if( pPager->pAllRead ){
-      sqlite3_log(SQLITE_ERROR, 
-          "Bitvec: pAllRead already allocated in PagerSharedLock()"
-      );
-    }
-#endif
   }
   return rc;
 }
 
 /*
@@ -5889,20 +5882,10 @@
       ** This is because in those states the code to roll back savepoint 
       ** transactions may copy data from the sub-journal into the database 
       ** file as well as into the page cache. Which would be incorrect in 
       ** WAL mode.
       */
-#ifndef SQLITE_OMIT_CONCURRENT
-      if( pPager->pAllRead 
-       && pPager->dbSize!=sqlite3BitvecSize(pPager->pAllRead) 
-      ){
-        sqlite3_log(SQLITE_ERROR, 
-            "Bitvec: pAllRead size is %d, dbOrigSize set to %d", 
-            (int)sqlite3BitvecSize(pPager->pAllRead), pPager->dbSize
-        );
-      }
-#endif
       pPager->eState = PAGER_WRITER_LOCKED;
       pPager->dbHintSize = pPager->dbSize;
       pPager->dbFileSize = pPager->dbSize;
       pPager->dbOrigSize = pPager->dbSize;
       pPager->journalOff = 0;