{"action":"opened","issue":{"url":"https://api.github.com/repos/MoonchildProductions/Pale-Moon/issues/920","repository_url":"https://api.github.com/repos/MoonchildProductions/Pale-Moon","labels_url":"https://api.github.com/repos/MoonchildProductions/Pale-Moon/issues/920/labels{/name}","comments_url":"https://api.github.com/repos/MoonchildProductions/Pale-Moon/issues/920/comments","events_url":"https://api.github.com/repos/MoonchildProductions/Pale-Moon/issues/920/events","html_url":"https://github.com/MoonchildProductions/Pale-Moon/issues/920","id":210268863,"number":920,"title":"Hangs on Facebook (and possibly others)","user":{"login":"wolfbeast","id":3359132,"avatar_url":"https://avatars.githubusercontent.com/u/3359132?v=3","gravatar_id":"","url":"https://api.github.com/users/wolfbeast","html_url":"https://github.com/wolfbeast","followers_url":"https://api.github.com/users/wolfbeast/followers","following_url":"https://api.github.com/users/wolfbeast/following{/other_user}","gists_url":"https://api.github.com/users/wolfbeast/gists{/gist_id}","starred_url":"https://api.github.com/users/wolfbeast/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/wolfbeast/subscriptions","organizations_url":"https://api.github.com/users/wolfbeast/orgs","repos_url":"https://api.github.com/users/wolfbeast/repos","events_url":"https://api.github.com/users/wolfbeast/events{/privacy}","received_events_url":"https://api.github.com/users/wolfbeast/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-02-25T23:04:32Z","updated_at":"2017-02-25T23:04:32Z","closed_at":null,"body":"From what I can gather from the hang reports submitted by different people, we're still seeing hangs in the mediadecoder, specifically `MediaDecoder::NotifyOwnerActivityChanged()`, where it will hang on a re-entrant guard `ReentrantMonitorAutoEnter mon(GetReentrantMonitor());`\r\n\r\nThe fact that this guard calls into nss threw me off but I've traced back the first usable xul.dll address to this particular function.\r\n\r\nPerhaps this is running on a different thread than the main thread, which would likely assert in a debug build, but in a release build just hangs.\r\nBecause it is a hang, the call stack doesn't help much but I'll see if I can dig a bit deeper."}}
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