On Mon, 2 Jan 2017 17:12:29 +0100 Václav Ovsík <vaclav.ov...@i.cz> wrote: > Can anybody confirm on different system?
Thanks for the detailed replication instructions. I can replicate, and have tracked down a minimal replication case. I'll drop my findings and suggestion on your ticket. The short form is that this is due to 4.4's new PreviewScrips functionality, which simulates (then rolls back) all of the changes, which is racing with the actual change. The bad news is that it's the real change, not the dry run, which gets killed in the deadlock detector, meaning that the owner does go unchanged. At least this is bubbled up to the user in the ticket display page, but this is still quite unfortunate. Amusingly, there are some strong parallels to the canonical Therac-25 case[1] -- the race here requires that one trigger a PreviewScrips very quickly before submitting, which is rare except with users quite accustomed to the UI. In the Therac-25 case, only skilled users could navigate to the bottom of the form within 8 seconds and thus deliver lethal doses of radiation to their patients. ...RT is designed to be robust, but there's a reason it doesn't rate itself as meant to be used for safety- or life-critical applications. - Alex [1] https://en.wikipedia.org/wiki/Therac-25