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(ITS#7491) mdb write bus error before adding 5 million keys

Full_Name: Clayton Stangeland
Version: git mdb.master last commit fed573cb86ed99f37bd062908ec814ee0ca47053
OS: Fedora 17 64 bit
URL: ftp://ftp.openldap.org/incoming/mtest-big.c
Submission from: (NULL) (

Building and running mdb from git branch mdb.master commit
fed573cb86ed99f37bd062908ec814ee0ca47053 on Fedora 17 64 bit I get a bus error.

When running the test below, which is a modification of mtest.c, I get a Bus
error. This happens while trying to write the file. gdb reports line 3936 of
mdb.c as the erroring line inside mdb_page_search_root: while (IS_BRANCH(mp)) {

If I set count to 4 million instead of 5 million it works, and adding back in
all the other mtest.c tests works as well then.

Here is the code:
/* mtest.c - memory-mapped database tester/toy */
 * Copyright 2011 Howard Chu, Symas Corp.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
#define _XOPEN_SOURCE 500               /* srandom(), random() */
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "lmdb.h"

int main(int argc,char * argv[])
        int i = 0, j = 0, rc;
        MDB_env *env;
        MDB_dbi dbi;
        MDB_val key, data;
        MDB_txn *txn;
        MDB_stat mst;
        MDB_cursor *cursor;
        int count;
        int *values;
        char sval[32];


            count = (5000000) + 64;
            values = (int *)malloc(count*sizeof(int));

            for(i = 0;i<count;i++) {
                        values[i] = random()%1000000000;

                rc = mdb_env_create(&env);
                rc = mdb_env_set_mapsize(env, 10485760000);
                rc = mdb_env_open(env, "./testdb", MDB_FIXEDMAP /*|MDB_NOSYNC*/,
                rc = mdb_txn_begin(env, NULL, 0, &txn);
                rc = mdb_open(txn, NULL, 0, &dbi);

                key.mv_size = sizeof(sval);
                key.mv_data = sval;
                data.mv_size = sizeof(sval);
                data.mv_data = sval;

            for (i=0;i<count;i++) {
                        sprintf(sval, "%08x %d foo bar", values[i], values[i]);
                        rc = mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE);
                        if (rc) j++;
                if (j) printf("%d duplicates skipped\n", j);
                rc = mdb_txn_commit(txn);
                rc = mdb_env_stat(env, &mst);

                mdb_close(env, dbi);

        return 0;