I don't have enough reputation points to comment to ask if they solved the problem originally stated here. I have the same problem of the program crashing in construction of an ofstream. It is not multi-threaded access, but it can be called in quick succession. I believe it crashes on the 2nd time. I use scope to ensure the stream object is destroyed. Why would this happen?
I tried std::fopen too. It also results in a crash.
Here is the code using the ofstream:
static bool writeConfigFile (const char * filename, const Config & cfg)
{
logsPrintLine(_SLOG_SETCODE(_SLOGC_CONFIG, 0), _SLOG_INFO, "Write config file (%s stream)", filename);
ofstream os(filename); // FIXME: Crashes here creating ofstream 2nd time
if (os.good())
{
// Uses stream insertion operator to output attributes to stream
// in human readable form (about 2kb)
outputConfig(cfg, os);
if (!os.good())
{
logsPrintLine(_SLOG_SETCODE(_SLOGC_CONFIG, 0), _SLOG_NOTICE, "Failed to write configuration file (%s)", filename);
return false;
}
logsPrintLine(_SLOG_SETCODE(_SLOGC_CONFIG, 0), _SLOG_INFO, "Configuration written to file (%s)", filename);
return true;
}
logsPrintLine(_SLOG_SETCODE(_SLOGC_CONFIG, 0), _SLOG_NOTICE, "Cannot write configuration file (%s)", filename);
return false;
}
/**
* Called when configuration settings have been read/received and validated
* @return true if successfully set, and written to file
*/
bool Config::set (SysConfigSource source, const struct SCADA_dsconfig * p)
{
Lock lock(mtxSet); // This is locking a mutex on construction of the lock. Release it on destruction.
// Setup the non-current one to switch to
Config * pCfg = pConfig.other();
unsigned i, f, n = 0;
// set attributes in pCfg based on the config received
// and some constants ...
pCfg->setWritten(writeConfigFile("test.conf", *pCfg));
if (!pCfg->isWritten())
{
// Don't set system config status here. Existing one still in use.
logsPrintLine(_SLOG_SETCODE(_SLOGC_CONFIG, 0), _SLOG_NOTICE, "Config file not written. Retain prior config.");
return false;
}
pConfig.swap(); // switch-in the new config
setSystemConfigSource(source);
toSyslog(pCfg);
notifyConfigChange();
return true;
}
It turned out to be a device driver bus master issue. Add "ahci nobmstr" when launching devb-ahci.