Re: (ITS#9037) observing crash in mdb_cursor_put()

[myk@mykzilla.org]

myk@mykzilla.org wrote on 2019-06-20 23:35:
> I'm unsure if it's related, but with this change to mdb.c, the following
> test program (which resembles Firefox's usage) asserts in
> mdb_cursor_init because rc is MDB_NOTFOUND.
Erm, here's the program without the errant characters:

#include <stdio.h>
#include <stdlib.h>
#include "lmdb.h"

#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
 Â Â Â  "%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)),
abort()))

int main(int argc,char * argv[])
{
 Â Â Â  int rc;
 Â Â Â  MDB_env *env;
 Â Â Â  MDB_dbi dbi;
 Â Â Â  MDB_val key, data;
 Â Â Â  MDB_txn *txn;
 Â Â Â  char sval[] = "foo";
 Â Â Â  char dval[] = "bar";

 Â Â Â  E(mdb_env_create(&env));
 Â Â Â  E(mdb_env_set_maxdbs(env, 2));
 Â Â Â  E(mdb_env_open(env, "./mytestdb", 0, 0664));

 Â Â Â  E(mdb_txn_begin(env, NULL, 0, &txn));
 Â Â Â  E(mdb_dbi_open(txn, "subdb", MDB_CREATE, &dbi));
 Â Â Â  E(mdb_txn_commit(txn));

 Â Â Â  key.mv_size = 3;
 Â Â Â  key.mv_data = sval;
 Â Â Â  data.mv_size = 3;
 Â Â Â  data.mv_data = dval;

 Â Â Â  E(mdb_txn_begin(env, NULL, 0, &txn));
 Â Â Â  E(mdb_put(txn, dbi, &key, &data, 0));
 Â Â Â  E(mdb_txn_commit(txn));

 Â Â Â  mdb_dbi_close(env, dbi);
 Â Â Â  mdb_env_close(env);

 Â Â Â  return 0;
}