bug#57215: ci: Fail to evaluate Guix specification

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Mathieu,

Mathieu Othacehe <othacehe@gnu.org> writes:

> Hello,
>
> Since commit 0565cde, Cuirass fails to evaluate the guix
> specification. The error messages do not give any clue, for instance:
> https://ci.guix.gnu.org/eval/504294/log/raw.
>
> I tried to strace an evaluation process of the guix specification, it
> ends this way:
>
> [pid 74060] write(1, "(values (value (result (((#:job-name . guix.i686-linux) (#:derivation . \"/gnu/store/ap7sixkbikfw1xib3aisbcaw6i2005m2-guix-a5f199732.drv\") (#:inputs \"/gnu/store/4mdqwn29pvjqd6hs1q842g5wzamjy3dk-module-import-compiled.drv\" \"/gnu/store/4nv9xf9qyabcw2gz9zvxlq9ymknq7wad-guix-daemon.drv\" \"/gnu/store/a6f7jk08bs6clingcw3j8kmz3cbsj6iq-guix-command.drv\" \"/gnu/store/fl7hls4j08hp45j32xjjrjc6d49qmbmy-guix-a5f199732-modules.drv\" \"/gnu/store/h9aagy9mv2bqg7b8q3k6aksi7fa20qzc-guix-manual.drv\" \"/gnu/store/iz11170b9da1i3pkjdv6314swzvzkgvk-guile-3.0.7.drv\") (#:outputs (\"out\" . \"/gnu/store/ivs9raslmb77zn0hrcza0wbv3r9lspay-guix-a5f199732\")) (#:nix-name . \"guix-a5f199732\") (#:system . \"i686-linux\") (#:max-silent-time . 3600) (#:timeout . 18000))))))\n", 737) = -1 EPIPE (Broken pipe)
> [pid 74060] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=74060, si_uid=997} ---
> [pid 74060] futex(0x7f1110e6f330, FUTEX_WAKE_PRIVATE, 2147483647) = 0
> [pid 74060] write(1, "(exception (arguments system-error (value \"fport_write\") (value \"~A\") (value (\"Broken pipe\")) (value (32))) (stack (#f (\"ice-9/boot-9.scm\" 1779 13)) (raise-exception (\"ice-9/boot-9.scm\" 1684 16)) (newline (#f #f #f)) (#f (\"guix/repl.scm\" 104 8)) (with-exception-handler (\"ice-9/boot-9.scm\" 1751 10)) (with-exception-handler (\"ice-9/boot-9.scm\" 1746 15)) (#f (\"guix/repl.scm\" 125 7))))\n", 385) = -1 EPIPE (Broken pipe)
> [pid 74060] --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=74060, si_uid=997} ---
>
> The evaluation process receives a SIGPIPE when trying to write the
> evaluation result to the pipe connecting it to "cuirass register".

It seems the evaluations are now completing correctly?

Perhaps it was related to the Shepherd issue that we are having on
Berlin, where after a while it seems to hang, which makes it impossible
to even SSH in.

Thanks,

Maxim