bug#67535: ci.guix.gnu.org 'Cannot allocate memory' while building for i686-linux

[Efraim Flashner]

On Wed, Nov 29, 2023 at 03:55:15PM -0500, Leo Famulari wrote:
> I see that ci.guix.gnu.org's builders seem to run out of memory while
> building kernel headers for i686-linux:
> 
> ------
> xz: (stdin): Cannot allocate memory
> /gnu/store/ns71xxkb3fzr37934bim9l8xiv68kc7w-tar-1.34/bin/tar: 
> /gnu/store/536ifp75wv8i1kb1k0szv7zd57ygpg0n-linux-libre-6.5.13-guix.tar.xz: 
> Wrote only 2048 of 10240 bytes
> /gnu/store/ns71xxkb3fzr37934bim9l8xiv68kc7w-tar-1.34/bin/tar: Child returned 
> status 1
> /gnu/store/ns71xxkb3fzr37934bim9l8xiv68kc7w-tar-1.34/bin/tar: Error is not 
> recoverable: exiting now
> ------
> 
> https://ci.guix.gnu.org/build/2736161/details

This looks like more of the too-many-cores while decompressing tarballs
issues we've had in the past on i686-linux.  Can we change that phase to
use a maximum of 4 cores or would that cause everything to rebuild?

-- 
Efraim Flashner   <efraim@flashner.co.il>   רנשלפ םירפא
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