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

[Christopher Baines <mail@cbaines.net>]

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Christopher Baines <mail@cbaines.net> writes:

> 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.

I've seen this happen with the build coordinator agent now (on
milano-guix-1):

  2023-06-02 18:59:55 2023-06-02 18:59:55 (DEBUG): fb9f06cf-cc1d-4493-88b8-3eac9437f5d4: checking the availability of build inputs
  2023-06-02 18:59:55 2023-06-02 18:59:55 (INFO ): fb9f06cf-cc1d-4493-88b8-3eac9437f5d4: setup successful, building: /gnu/store/7fbrli2a8nzn676q8gz2b0i0y0lr9nxv-r-quasr-1.40.0.drv
  2023-06-02 19:00:46 Signals delivery fails constantly at GC #55
  2023-06-02 19:01:22 Signals delivery fails constantly
  2023-06-02 19:01:29 locale is en_US.utf8
  2023-06-02 19:01:29 (gnutls version: 3.7.7, guix version: 1.4.0-6.dc5430c)

Which is a bit more concerning, since the build coordinator agent is
intentionally quite simple (no SQLite for example).

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