[darcs-devel] incremental rebuild segfault

[Ben Franksen]

Am 02.09.19 um 10:28 schrieb Ganesh Sittampalam:
> On 28/08/2019 10:32, Ganesh Sittampalam wrote:
>> On 27/08/2019 19:47, Ben Franksen wrote:
>>> Am 27.08.19 um 12:41 schrieb Ganesh Sittampalam:
>>>> I can reproduce it on Linux, GHC 8.6.4 (a VM on my Windows machine, so I
>>>> guess it's theoretically possible that it's a hardware fault, but highly
>>>> unlikely).
>>>>
>>>> Ben, could you check if you can reproduce it?
>>>
>>> Indeed I can!
>>
>> Thanks :-/ I guess the next job (for me, unless someone else volunteers
>> :-)) is to turn this into a GHC bug report. I had a look at reproducing
>> with GHC 8.8.1 but the ecosystem isn't ready yet to build Darcs without
>> some effort.
> 
> After cutting down the example significantly, I ran it with GHC 8.8.1
> and the problem was gone. Looking in the GHC 8.8.1 changelog, it looks
> very much like this issue:
> 
> https://gitlab.haskell.org/ghc/ghc/issues/16608
> 
> though I haven't inspected the Core to see if it has exactly the same
> characteristics.
> 
> I think I'll leave it at that as digging further would be yet more hours
> of work.

Agreed. And thanks for investigating it that far.

Cheers
Ben