Ludovic Courtès writes:

Hello!

> <janneke@gnu.org> skribis:
>
>> Anyway, using this patch 0001 it seems that suppressing the warnings
>> works, I no longer get
>>
>> "GC Warning: Repeated allocation of very large block (appr. size 112
>> KiB):\n\tMay lead to memory leak and poor performance\n"
>>
>>
>> but still get
>>
>> unexpected build daemon error: stoi
>
> Damnit.  Could you check with rpctrace what the daemon receives?
>
> I wonder if I misunderstood what the root cause is.

TL;DR: Found it, attached is a patch to fix it.

Today I spent some time looking into this again, instrumented both
daemons with the attached patch for local-store.cc; a "guix copy
root@childhurd hello" gives:

host:
--8<---------------cut here---------------start------------->8---
accepted connection from pid 21474, user janneke
00 nondigit: ` ' [32]
01 read until now: >>>0<<<
00 nondigit: `:' [58]
01 read until now: >>>430<<<
--8<---------------cut here---------------end--------------->8---

childhurd:
--8<---------------cut here---------------start------------->8---
5 operations
00 nondigit: `G' [71]
01 read until now: >>><<<
02 nondigit: `G' [71]
03 nondigit: >>>GC Warning: Repeated allocation of very large block (appr. size 112 KiB):<<<
0 operations
--8<---------------cut here---------------end--------------->8---

...you already knew that from the rpctrace log.

So, the problem is that our patch doesrn't disable the warnings after all.
The guile-launcher has

guile-launcher.c:
--8<---------------cut here---------------start------------->8---
#if defined __GNU__
  /* XXX: On 32-bit GNU/Hurd (i586-gnu), libgc emits "Repeated allocation"
     warnings that are annoying and interfere with communications between
     'guix-daemon' and 'guix authenticate':
     <https://issues.guix.gnu.org/73181>.  Silence them.  */
  std::cerr << "silencing libgc warnings" << std::endl;
  GC_set_warn_proc (no_warnings);
#endif
  ..
  scm_boot_guile (argc, argv, inner_main, 0);
--8<---------------cut here---------------end--------------->8---

and then guile's gc.c just undoes that

init.c:
--8<---------------cut here---------------start------------->8---
scm_i_init_guile (void *base)
{
  ..
  scm_init_gc ();		/* Requires hooks and `get_internal_run_time' */
--8<---------------cut here---------------end--------------->8---

gc.c:
--8<---------------cut here---------------start------------->8---
void
scm_init_gc ()
{
  ..
  GC_set_warn_proc (scm_gc_warn_proc);
--8<---------------cut here---------------end--------------->8---

Doh' So, attached is also a patch for Guix (that I made for Guile) that
fixed offloading again for me.  Weirdly, I had to use
(overload-threshold #f) because my childhurd never falls below 1.0:

--8<---------------cut here---------------start------------->8---
root@guixygnu ~# uptime
 7:45:28 PM  up 35 minutes,  0 users,  load averages: 1.00, 1.01, 1.00
--8<---------------cut here---------------end--------------->8---


--8<---------------cut here---------------start------------->8---
19:25:48 janneke@glimdal:~/src/guix/hurd-team
$ ./pre-inst-env guix build --system=i586-gnu -e '(@@ (gnu packages commencement) gnu-make-boot0)' --with-configure-flag=make-boot0=foo=bar
The following derivation will be built:
  /gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv
process 4454 acquired build slot '/var/guix/offload/localhost:11022/0'
normalized load on machine 'localhost' is 1.00
building /gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv...
guix offload: sending 41 store items (259 MiB) to 'localhost'...
[..]
@ build-started /gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv - i586-gnu /var/log/guix/drvs/cp//1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv.gz 360
[..]
@ build-succeeded /gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv -
retrieving 1 store item from 'localhost'...
importing file or directory '/gnu/store/j83d3mzcjw83lcbvyd8hrs6i6ymdqbmc-make-boot0-4.4.1'...
found valid signature for '/gnu/store/j83d3mzcjw83lcbvyd8hrs6i6ymdqbmc-make-boot0-4.4.1'
registering 1 items
done with offloaded '/gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv'
successfully built /gnu/store/cp1fy0ig5p8d72vnz1vybw2cilii5g88-make-boot0-4.4.1.drv
/gnu/store/j83d3mzcjw83lcbvyd8hrs6i6ymdqbmc-make-boot0-4.4.1
--8<---------------cut here---------------end--------------->8---

WDYT?

Greetings,
Janneke