If the page size is wrong on the page1 content inside a WAL file, then

running VACUUM could trigger an assert().  This check-in changes that assert()
into a branch that returns SQLITE_CORRUPT.
[forum:/info/4ef9b37d74d2d2e8|Forum post 4ef9b37d74d2d2e8]

FossilOrigin-Name: 0512f82a2cde7447cb348d9fd620f39f2f0e359141903cde20f7ba30b5d34af3

src/wal.c

@@ -3710,7 +3710,7 @@ int sqlite3WalFrames(
       if( rc ) return rc;
     }
   }
-  assert( (int)pWal->szPage==szPage );
+  if( (int)pWal->szPage!=szPage ) return SQLITE_CORRUPT_BKPT;
 
   /* Setup information needed to write frames into the WAL */
   w.pWal = pWal;