{"action":"opened","issue":{"url":"https://api.github.com/repos/nodejs/node/issues/4815","labels_url":"https://api.github.com/repos/nodejs/node/issues/4815/labels{/name}","comments_url":"https://api.github.com/repos/nodejs/node/issues/4815/comments","events_url":"https://api.github.com/repos/nodejs/node/issues/4815/events","html_url":"https://github.com/nodejs/node/issues/4815","id":128094259,"number":4815,"title":"util.format(object) causes node debugger to terminate","user":{"login":"mattoshry","id":1676525,"avatar_url":"https://avatars.githubusercontent.com/u/1676525?v=3","gravatar_id":"","url":"https://api.github.com/users/mattoshry","html_url":"https://github.com/mattoshry","followers_url":"https://api.github.com/users/mattoshry/followers","following_url":"https://api.github.com/users/mattoshry/following{/other_user}","gists_url":"https://api.github.com/users/mattoshry/gists{/gist_id}","starred_url":"https://api.github.com/users/mattoshry/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mattoshry/subscriptions","organizations_url":"https://api.github.com/users/mattoshry/orgs","repos_url":"https://api.github.com/users/mattoshry/repos","events_url":"https://api.github.com/users/mattoshry/events{/privacy}","received_events_url":"https://api.github.com/users/mattoshry/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-01-22T06:32:42Z","updated_at":"2016-01-22T06:32:42Z","closed_at":null,"body":"```\r\n$ node -v\r\nv4.2.6\r\n\r\n$ node debug format.js \r\n< Debugger listening on port 5858\r\ndebug> . ok\r\nbreak in format.js:1\r\n> 1 var util = require('util');\r\n  2 var output = util.format({ p1: 'v1' });\r\n  3 console.log(output);\r\ndebug> n\r\nbreak in format.js:2\r\n  1 var util = require('util');\r\n> 2 var output = util.format({ p1: 'v1' });\r\n  3 console.log(output);\r\n  4 \r\ndebug> n\r\nprogram terminated\r\n```\r\n\r\nThis is not reproducible in node@4.2.1.\r\nRan into this because util.format is how log4js formats log data.\r\n\r\n[1] https://github.com/nomiddlename/log4js-node/blob/0fc65d38eb0210bbb2d5bf12b40d3588f7c318e2/lib/layouts.js#L40"}}