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

From: Leo Famulari <[email-masked]>
Date: Wed, 29 Nov 2023 15:55:15 -0500

I see that ci.guix.gnu.org's builders seem to run out of memory while
building kernel headers for i686-linux:

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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
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https://ci.guix.gnu.org/build/2736161/details