When you find a stack trace in the error log you should look into the dump files and see what caused the error and why. If might be something as minor as an unchecked bug in xp_sendmail, or something much more serious. If you aren’t sure what caused the problem, post the issue on a forum such as this one, along with the stack dump information. Don’t include the actual memory dump as that will contain raw data from memory at the time of the crash, but the other files should be safe to upload.
Depending on what caused the dump message will determine what further steps need to be taken.