[Bug debuginfod/28708] run-debuginfod-webapi-concurrency.sh seems to be flaky

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28708

--- Comment #13 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Evgeny Vereshchagin from comment #12)
> FWIW with
> https://sourceware.org/git/?p=elfutils.git;a=commit;
> h=e646e363e72e06e0ed5574c929236d815ddcbbaf applied the test appears to be
> flaky on Packit on s390x:
> https://copr-be.cloud.fedoraproject.org/results/packit/evverx-elfutils-73/
> fedora-35-s390x/03942110-elfutils/builder-live.log.gz

So that log contains the feared:
error_count{libmicrohttpd="Server reached connection limit. Closing inbound
connection.\n"} 35

And sadly I have also been able to replicate that on another s390x setup even
with all the latest patches.

The thing they seem to have in common is that they are both s390x and have only
2 cores.

If I lower the -C100 to -C32 in run-debuginfod-webapi-concurrency.sh it does
seem to always pass. But with -C50 or higher is does occasionally fail (the
higher to more frequent it fails).

BTW. run-debuginfod-webapi-concurrency.sh seems stable on any other system I've
thrown it at. So it isn't exactly clear what "such a system" is? Is it s390x
specific?

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