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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) (192.94.73.31)
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];
srandom(time(NULL));
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*/,
0664);
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);
free(values);
mdb_close(env, dbi);
mdb_env_close(env);
return 0;
}