[U-Boot] Builds in MAKEALL -a arm failing sometimes when BUILD_NBUILDS>1?

Hello,
... this time from the present.
Recently I have seen MAKEALL -a arm fail sporadically on some boards during parallel builds; more specifically, with BUILD_NBUILDS=8 and BUILD_NCPUS=1.
Has anyone seen this, or is anyone working on MAKEALL arm now and willing to give a look?
Note that the actual machine has a 4-core, 8-thread CPU, so maybe that was because the number of parallel builds was just equal to the number of (pseudo) CPUs available; I am now using six parallel builds and haven't seen the issue again so far.
On second (and slightly more caffeinated) thought, it could be related to building variants of a single target in boards.cfg -- maybe when cleaning files for one variant while another one is being built.
(also, I prepend the command with LANG=C to avoid making the error messages any more French than they already are when I copy-paste them to the list. Not sure how that could have any influence on the build errors, of course.)
Amicalement,
participants (1)
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Albert ARIBAUD