Segmentation fault when connecting to MySQL - c++

Question

I have this code in a big project that makes a connection to a MySQL database, and does not work:
boost::shared_ptr<sql::Connection> connection;
sql::Driver *driver = get_driver_instance();
assert(driver != 0);
std::string server = "servname", user = "pietro", password = "abc";
try
{
connection.reset(driver->connect(server, user, password));
assert(connection != 0);
if(connection->isClosed() == false) // <-- segmentation fault
{
}
}
I get a segmentation fault where indicated (all parameters are valid).
However, this same code works in a test project.
Going into the sql::Connection::isClosed() member function with a debugger, I obtain no information about the possible cause; here is where I get:
mysql-connector-c++-1.0.5/driver/mysql_connection.cpp - line 430
/* {{{ MySQL_Connection::checkClosed() -I- */
void
MySQL_Connection::checkClosed()
{
CPP_ENTER_WL(intern->logger, "MySQL_Connection::checkClosed");
if (!intern->is_valid) {
throw sql::SQLException("Connection has been closed");
}
}
This checkClosed() function is successfully executed seven times from connection.reset() just before. The value of the "intern" pointer does not change and is not null at this stage.
When I check if the connection is closed, the checkClosed() function is run again. Now the "intern" pointer value is 0x8, a location I cannot access.
Here I get a SIGSEGV, segmentation fault.
Let me know if you would like the disassembled code...
Platform:
MySQL 5.x
MySQL Connector/C++ 1.0.5
Linux - OpenSuse 11.4
P.S.:
I noticed that all the shared_ptr's member functions work as expected:
connection.get(); // = 0x8fb4a0
connection.use_count(); // = 1
connection.unique(); // = 1
while all the calls done on the pointed object cause the segmentation fault (SIGABRT):
connection->getClientInfo();
connection->isClosed();

Answer 1

either your connection deleted, or you have memory corruption. use valgrind to find answer