[9.4] ghc-pkg update race: make -j20: Error: ghc-cabal: Encountered missing or private dependencies: rts >=1.0 && <1.1

Summary

make -j48 can make a ghc build fail : I guess there is a missing dependency.

Maybe the makefiles are missing a dependency for ghc-prim on rts?

Steps to reproduce

Build ghc-9.4 (reproduced with both 9.4.1 and 9.4.2) with make -j48 (probably on a builder with 48+ cores).

+ make -j48
:
:
"inplace/bin/ghc-cabal" configure libraries/ghc-prim dist-install --with-ghc="/builddir/build/BUILD/ghc-9.4.2/inplace/bin/ghc-stage1" --with-ghc-pkg="/builddir/build/BUILD/ghc-9.4.2/inplace/bin/ghc-pkg"  --disable-library-for-ghci --enable-library-vanilla --enable-library-for-ghci --disable-library-profiling --enable-shared --configure-option=CFLAGS="-Wall    -Werror=unused-but-set-variable -Wno-error=inline -iquote /builddir/build/BUILD/ghc-9.4.2/libraries/ghc-prim" --configure-option=LDFLAGS="  " --configure-option=CPPFLAGS="   " --gcc-options="-Wall    -Werror=unused-but-set-variable -Wno-error=inline -iquote /builddir/build/BUILD/ghc-9.4.2/libraries/ghc-prim   " --configure-option=--with-gmp --configure-option=--host=x86_64-unknown-linux --with-gcc="/usr/bin/gcc" --with-ld="ld.gold" --with-ar="/usr/bin/ar" --with-alex="/usr/bin/alex" --with-happy="/usr/bin/happy"
Configuring ghc-prim-0.9.0...
Error: ghc-cabal: Encountered missing or private dependencies:
rts >=1.0 && <1.1
make[1]: *** [libraries/ghc-prim/ghc.mk:4: libraries/ghc-prim/dist-install/package-data.mk] Error 1
make: *** [Makefile:126: all] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.u8KZqC (%build)

A number of Fedora x86_64 buildservers have 48 cpu cores.

Example failure: https://koji.fedoraproject.org/koji/taskinfo?taskID=91162823

I hit this a couple of times now, so finally reporting - but I can workaround by limiting the max cpus used.

Expected behavior

No build error

Environment

• GHC version used: boot from 9.0.2

Optional:

• Operating System: Fedora Linux
• System Architecture: x86_64