A possible patch for the crash (just based on code inspection by Nika and me) https://treeherder.mozilla.org/#/jobs?repo=try&revision=bf8158b6fbdd960e355dd159aa50d5fa9e6835cc
Bug 1637329 Comment 15 Edit History
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A possible patch for the crash (just based on code inspection by Nika and me) https://treeherder.mozilla.org/#/jobs?repo=try&revision=bf8158b6fbdd960e355dd159aa50d5fa9e6835cc oops, I had something unrelated on that tree too. Oh well, that shouldn't affect to shutdown.