The file has taken more memory than it is allocated in php.ini file seems like 200mb in this case
(thats why i say magento is heavy...lol)
Last time it happened to me ,i found these were the solution
ini_set('memory_limit', 200* 1024 * 1024);
memory_limit = 200M
php_value memory_limit 200M
mine was shared server so had to go with 3rd option.
It solved things...but at the same time you may want to relook into just created module or code change to inquire what actually is taking so much of the memory as default magento doesnt take that much of memory to run.....