bug#63368: Build coordiantor "Signals delivery fails constantly" crashes

[Christopher Baines]

Ludovic Courtès <ludo@gnu.org> writes:

> Christopher Baines <mail@cbaines.net> skribis:
>
>> Since the recent core-updates merge, I've seen the build coordinator
>> using less memory, but it's also been crashing in a new way, up to 10
>> times a day.
>>
>> In the log, you see something like:
>>
>>   2023-05-07 09:15:42 Signals delivery fails constantly at GC #71051
>>   2023-05-07 09:15:42 Signals delivery fails constantly
>>
>> I'm guessing the switch from libgc-8.0.4 to libgc-8.2.2 has something to
>> do with this.
>
> Normally on GNU/Linux libgc has:
>
>   #define SIG_SUSPEND SIGPWR
>
> The Coordinator fiddles with SIGALRM, SIGUSR1, SIGINT, and SIGPIPE,
> which should normally be fine.
>
> Is there anything else that might interfere with libgc?

I've seen this issue in both the build coordinator and nar-herder, both
of which use guile-sqlite, so I wonder if that could have something to
do with it.

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