Consistent CI failure in job nightly-i386-linux-deb9-validate

[Cheng Shao]

I believe we can either modify ci.sh to disable parallel compression
for i386, or modify .gitlab/gen_ci.hs and .gitlab/jobs.yaml to disable
XZ_OPT=-9 for i386.

On Wed, Sep 28, 2022 at 1:21 PM Bryan Richter <bryan at haskell.foundation> wrote:
>
> Aha: while i386-linux-deb9-validate sets no extra XZ options, nightly-i386-linux-deb9-validate (the failing job) sets "XZ_OPT = 9".
>
> A revert would fix the problem, but presumably so would tweaking that option. Does anyone have information that would lead to a better decision here?
>
>
> On Wed, Sep 28, 2022 at 2:02 PM Cheng Shao <cheng.shao at tweag.io> wrote:
>>
>> Sure, in which case pls revert it. Apologies for the impact, though
>> I'm still a bit curious, the i386 job did pass in the original MR.
>>
>> On Wed, Sep 28, 2022 at 1:00 PM Bryan Richter <bryan at haskell.foundation> wrote:
>> >
>> > Yep, it seems to mostly be xz that is running out of memory. (All recent builds that I sampled, but not all builds through all time.) Thanks for pointing it out!
>> >
>> > I can revert the change.
>> >
>> > On Wed, Sep 28, 2022 at 11:46 AM Cheng Shao <cheng.shao at tweag.io> wrote:
>> >>
>> >> Hi Bryan,
>> >>
>> >> This may be an unintended fallout of !8940. Would you try starting an
>> >> i386 pipeline with it reversed to see if it solves the issue, in which
>> >> case we should revert or fix it in master?
>> >>
>> >> On Wed, Sep 28, 2022 at 9:58 AM Bryan Richter via ghc-devs
>> >> <ghc-devs at haskell.org> wrote:
>> >> >
>> >> > Hi all,
>> >> >
>> >> > For the past week or so, nightly-i386-linux-deb9-validate has been failing consistently.
>> >> >
>> >> > They show up on the failure dashboard because the logs contain the phrase "Cannot allocate memory".
>> >> >
>> >> > I haven't looked yet to see if they always fail in the same place, but I'll do that soon. The first example I looked at, however, has the line "xz: (stdin): Cannot allocate memory", so it's not GHC (alone) causing the problem.
>> >> >
>> >> > As a consequence of showing up on the dashboard, the jobs get restarted. Since they fail consistently, they keep getting restarted. Since the jobs keep getting restarted, the pipelines stay alive. When I checked just now, there were 8 nightly runs still running. :) Thus I'm going to cancel the still-running nightly-i386-linux-deb9-validate jobs and let the pipelines die in peace. You can still find all examples of failed jobs on the dashboard:
>> >> >
>> >> > https://grafana.gitlab.haskell.org/d/167r9v6nk/ci-spurious-failures?orgId=2&from=now-90d&to=now&refresh=5m&var-types=cannot_allocate
>> >> >
>> >> > To prevent future problems, it would be good if someone could help me look into this. Otherwise I'll just disable the job. :(
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