Intermittent cabal solver failure building (I think) "binary"

Cabal says "After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: ghc-boot:setup.Cabal, ghc-boot:setup.pretty, pretty, ghc-boot, Cabal".

Incidents in the last two weeks:

json->>'id'	json->>'name'	json->>'web_url'	json->>'runner.description'	date(json->>'created_at')
1758471	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1758471	azure-ghc-ci-linux-1	2024-01-23
1757837	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1757837	x86_64-linux-6.zw3rk_x86_64-linux-6_db038e4e1623	2024-01-22
1757489	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1757489	azure-ghc-ci-linux-1	2024-01-21
1756611	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1756611	x86_64-linux-6.zw3rk_x86_64-linux-6_db038e4e1623	2024-01-20
1756143	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1756143	azure-ghc-ci-linux-2	2024-01-19
1755357	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1755357	x86_64-linux-5.zw3rk_x86_64-linux-5_db038e4e1623	2024-01-18
1754037	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1754037	x86_64-linux-2.zw3rk_x86_64-linux-2_d292a225d2eb	2024-01-17
1753131	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1753131	azure-ghc-ci-linux-2	2024-01-16
1752195	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1752195	x86_64-linux-5.zw3rk_x86_64-linux-5_db038e4e1623	2024-01-15
1751676	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1751676	azure-ghc-ci-linux-1	2024-01-14
1751211	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1751211	x86_64-linux-3.zw3rk_x86_64-linux-3_db038e4e1623	2024-01-13
1750686	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1750686	x86_64-linux-6.zw3rk_x86_64-linux-6_db038e4e1623	2024-01-12
1750635	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1750635	x86_64-linux-6.zw3rk_x86_64-linux-6_db038e4e1623	2024-01-12
1749605	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1749605	x86_64-linux-3.zw3rk_x86_64-linux-3_db038e4e1623	2024-01-11
1748472	test-cabal-reinstall-x86_64-linux-deb10	https://gitlab.haskell.org/ghc/ghc/-/jobs/1748472	x86_64-linux-7.zw3rk_x86_64-linux-7_db038e4e1623	2024-01-10

| Create directory /builds/ghc/ghc/_build/stage-cabal/bin
# _build/stage-cabal/cabal-packages
# /usr/local/bin/cabal
| Run Cabal Install Stage2: none => none
/usr/local/bin/cabal --store-dir=/builds/ghc/ghc/_build/stage-cabal/cabal-store build binary --project-file /builds/ghc/ghc/cabal.project-reinstall --distdir _build/stage-cabal/
dist-newstyle --with-compiler=/builds/ghc/ghc/_build/stage1/bin/ghc --enable-executable-dynamic --enable-library-vanilla
Command line: /usr/local/bin/cabal --store-dir=/builds/ghc/ghc/_build/stage-cabal/cabal-store build binary --project-file /builds/ghc/ghc/cabal.project-reinstall --distdir _buil
d/stage-cabal/dist-newstyle --with-compiler=/builds/ghc/ghc/_build/stage1/bin/ghc --enable-executable-dynamic --enable-library-vanilla
===> Command failed with error code: 1
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.6.2.0 supports
'ghc' version < 9.4): /builds/ghc/ghc/_build/stage1/bin/ghc is version
9.9.20240120
cabal: Could not resolve dependencies:
[__0] trying: Cabal-3.11.0.0 (user goal)
[__1] trying: pretty-1.1.3.6/installed-inplace (dependency of Cabal)
[__2] trying: ghc-boot-9.9 (user goal)
[__3] next goal: ghc-boot:setup.Cabal (dependency of ghc-boot)
[__3] rejecting: ghc-boot:setup.Cabal~>Cabal-3.11.0.0,
ghc-boot:setup.Cabal-3.11.0.0, ghc-boot:setup.Cabal-3.10.1.0,
ghc-boot:setup.Cabal-3.8.1.0 (constraint from maximum version of Cabal used by
Setup.hs requires <3.8)
[__3] trying: ghc-boot:setup.Cabal-3.6.3.0
[__4] next goal: ghc-boot:setup.pretty (dependency of ghc-boot:setup.Cabal)
[__4] rejecting: ghc-boot:setup.pretty~>pretty-1.1.3.6/installed-inplace
(conflict: ghc-boot:setup.Cabal => ghc-boot:setup.deepseq>=1.3.0.1 && <1.5,
ghc-boot:setup.pretty => ghc-boot:setup.deepseq==1.5.0.0/installed-inplace)
[__4] rejecting: ghc-boot:setup.pretty-1.1.3.6/installed-inplace (multiple
instances)
[__4] rejecting: ghc-boot:setup.pretty-1.1.3.6, ghc-boot:setup.pretty-1.1.3.5,
ghc-boot:setup.pretty-1.1.3.4, ghc-boot:setup.pretty-1.1.3.3,
ghc-boot:setup.pretty-1.1.3.2, ghc-boot:setup.pretty-1.1.3.1,
ghc-boot:setup.pretty-1.1.2.1, ghc-boot:setup.pretty-1.1.2.0,
ghc-boot:setup.pretty-1.1.1.3, ghc-boot:setup.pretty-1.1.1.2,
ghc-boot:setup.pretty-1.1.1.1, ghc-boot:setup.pretty-1.1.1.0,
ghc-boot:setup.pretty-1.1.0.0, ghc-boot:setup.pretty-1.0.1.2,
ghc-boot:setup.pretty-1.0.1.1, ghc-boot:setup.pretty-1.0.1.0,
ghc-boot:setup.pretty-1.0.0.0 (constraint from project config
/builds/ghc/ghc/cabal.project-reinstall requires installed instance)
[__4] fail (backjumping, conflict set: pretty, ghc-boot:setup.Cabal,
ghc-boot:setup.pretty)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: ghc-boot:setup.Cabal,
ghc-boot:setup.pretty, pretty, ghc-boot, Cabal
Try running with --minimize-conflict-set to improve the error message.