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e011521ef1
there were two failures during observed in testing, both occurring when 'rndc halt' was run rather than 'rndc stop' - the latter dumps zone contents to disk and presumably introduced enough delay to prevent the races: - a failure when the zone was shut down and called dns_xfrin_detach() before the xfrin had finished connecting; the connect timeout terminated without detaching its handle - a failure when the tcpdns socket timer fired after the outerhandle had already been cleared. this commit incidentally addresses a failure observed in mutexatomic due to a variable having been initialized incorrectly.