There's a failure case where content processes are crashing but no stack trace is being printed. Test harnesses often rely on the presence of a minidump to determine whether or not there was a crash, and so in this failure mode report success (so tasks are staying green). This adds a new string to mozharness' error logs to make sure the task turns orange. Note: it does not fix the lack of stack traces.
Bug 1551885 Comment 1 Edit History
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Sorry, wrong bug # in the commit message.