As one small data point I can say that I already upgraded cysignals in nixpkgs 
(tested Linux, although it could technically be used on other platforms too). I 
didn't run into any obvious issues.

I also think we should merge that upgrade for 8.3. Erik put in a lot of work to 
make that platform supported and I think the least we should do is support him 
in supporting it :)

Sage has a lot of tests. It might even test a little too much (making the test 
suite brittle). I'm sure they would catch most regressions faster than 1-2 
weeks.

And worst case, if a regression slips through, why are we not doing bug fix 
releases? E.g. sage 8.3.1.

On July 18, 2018 11:44:33 PM GMT+02:00, Volker Braun <vbraun.n...@gmail.com> 
wrote:
>On Wednesday, July 18, 2018 at 1:34:56 PM UTC+2, Erik Bray wrote:
>>
>> All that said, your claim that this is a "high-risk" upgrade is also 
>> highly specious.  This is upgrading Cysignals from 1.7.1 to 1.7.2 [1]
>
>> which contains a couple bug fixes, the most significant of which (in 
>> terms of patch size) impacts Cygwin only.
>
>
>I haven't looked at the diff set, but we did have regressions from
>minor 
>cysignals changes before. Its just that signal handlers, due to their 
>asynchronous nature and interactions with the OS, are notoriously hard
>to 
>reason about. 
>
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