It appears that the build fails because of the `/debian/debian.env`
file. The contents of it changed recently in the 5.10. line (starting
with 5.10.37) - but are OK before that and also in 5.12.x .
It is also noticeable that that "faulty" (?) commits/configs come from
"kathleen" instead of
5.10.x and 5.11.x kernels after this one without diskspace do not build
anymore with even less progress / log output:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.21/
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.22/
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10.37/
