This is causing bug 1536714, but I have seen it in other places too. It seems that the socket process isn't doing all the graceful shutdown stuff it should be, but I'm not entirely sure what is missing. Note that I have seen this in tests that do not involve any webrtc while working on bug 1555792; this problem is extremely common in the browser-chrome mochitests on OS X. https://treeherder.mozilla.org/#/jobs?repo=try&revision=599828fdeb7aff9d4ca8c8fa05f6acf6e814fb1a
Bug 1563821 Comment 0 Edit History
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This is causing bug 1536714, but I have seen it in other places too. It seems that the socket process isn't doing all the graceful shutdown stuff it should be, but I'm not entirely sure what is missing. Note that I have seen this in tests that do not involve any webrtc while working on bug 1555792; this problem is extremely common in the browser-chrome mochitests on OS X if the socket process is enabled. https://treeherder.mozilla.org/#/jobs?repo=try&revision=599828fdeb7aff9d4ca8c8fa05f6acf6e814fb1a