2026-02-27 11:56.58: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/heads/main (c44ee5ce96c120b7ccc23a12d241dc8672e2888f) (windows-x86_64:windows-server-mingw-ltsc2025-5.4_opam-2.5) Base: ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:fedecf8e7810af08d566e6e877bd4ed7ad4c107b8cc32164f71632fffceb8869 Opam project build To reproduce locally: git clone --recursive "https://github.com/ocaml-multicore/eio.git" -b "main" && cd "eio" && git reset --hard c44ee5ce cat > Dockerfile <<'END-OF-DOCKERFILE' FROM ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:fedecf8e7810af08d566e6e877bd4ed7ad4c107b8cc32164f71632fffceb8869 # windows-server-mingw-ltsc2025-5.4_opam-2.5 USER 1000:1000 ENV CLICOLOR_FORCE="1" ENV OPAMCOLOR="always" RUN ln -f /usr/local/bin/opam-2.5 /usr/local/bin/opam RUN opam init --reinit -ni RUN uname -rs && opam exec -- ocaml -version && opam --version RUN cd ~/opam-repository && (git cat-file -e ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 || git fetch origin master) && git reset -q --hard ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 && git log --no-decorate -n1 --oneline && opam update -u COPY --chown=1000:1000 eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam /home/opam/src/./ RUN opam pin add -yn eio_windows.dev '/home/opam/src/./' && \ opam pin add -yn eio_posix.dev '/home/opam/src/./' && \ opam pin add -yn eio_main.dev '/home/opam/src/./' && \ opam pin add -yn eio_linux.dev '/home/opam/src/./' && \ opam pin add -yn eio.dev '/home/opam/src/./' RUN echo '(lang dune 3.0)' > '/home/opam/src/./dune-project' ENV DEPS="afl-persistent.1.4 alcotest.1.9.1 arch-x86_64.1 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 conf-bash.1 conf-mingw-w64-gcc-x86_64.1 containers.3.18 cppo.1.8.0 crowbar.0.2.2 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 domain-local-timeout.1.0.1 dscheck.0.5.0 dune.3.21.1 dune-configurator.3.21.1 either.1.0.0 flexdll.0.44 fmt.0.11.0 hmap.0.8.1 host-arch-x86_64.1 host-system-mingw.1 iomux.0.4 kcas.0.7.0 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.1 mingw-w64-shims.0.2.0 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-config.3 ocaml-env-mingw64.1 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.0.3 ocamlbuild.0.16.1 ocamlfind.1.9.8 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.14.0 result.1.5 seq.base stdlib-shims.0.3.0 system-mingw.1 thread-table.1.0.0 topkg.1.1.1 tsort.2.2.0 uutf.1.0.4 yojson.3.0.0" ENV CI="true" ENV OCAMLCI="true" RUN opam update --depexts && opam install --cli=2.5 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS RUN opam install $DEPS COPY --chown=1000:1000 . /home/opam/src RUN cd /home/opam/src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build END-OF-DOCKERFILE docker build . END-REPRO-BLOCK 2026-02-27 11:56.58: Using cache hint "ocaml-multicore/eio-ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:fedecf8e7810af08d566e6e877bd4ed7ad4c107b8cc32164f71632fffceb8869-windows-server-mingw-ltsc2025-5.4_opam-2.5-ce37fd8fad3007079f0d6e80f27be48b" 2026-02-27 11:56.58: Using OBuilder spec: ((from ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:fedecf8e7810af08d566e6e877bd4ed7ad4c107b8cc32164f71632fffceb8869) (comment windows-server-mingw-ltsc2025-5.4_opam-2.5) (user (uid 1000) (gid 1000)) (env CLICOLOR_FORCE 1) (env OPAMCOLOR always) (run (shell "ln -f /usr/local/bin/opam-2.5 /usr/local/bin/opam")) (run (shell "opam init --reinit -ni")) (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "cd ~/opam-repository && (git cat-file -e ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 || git fetch origin master) && git reset -q --hard ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 && git log --no-decorate -n1 --oneline && opam update -u")) (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam) (dst /home/opam/src/./)) (run (network host) (shell "opam pin add -yn eio_windows.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_posix.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_main.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_linux.dev '/home/opam/src/./' && \ \nopam pin add -yn eio.dev '/home/opam/src/./'")) (run (network host) (shell "echo '(lang dune 3.0)' > '/home/opam/src/./dune-project'")) (env DEPS "afl-persistent.1.4 alcotest.1.9.1 arch-x86_64.1 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 conf-bash.1 conf-mingw-w64-gcc-x86_64.1 containers.3.18 cppo.1.8.0 crowbar.0.2.2 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 domain-local-timeout.1.0.1 dscheck.0.5.0 dune.3.21.1 dune-configurator.3.21.1 either.1.0.0 flexdll.0.44 fmt.0.11.0 hmap.0.8.1 host-arch-x86_64.1 host-system-mingw.1 iomux.0.4 kcas.0.7.0 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.1 mingw-w64-shims.0.2.0 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-config.3 ocaml-env-mingw64.1 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.0.3 ocamlbuild.0.16.1 ocamlfind.1.9.8 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.14.0 result.1.5 seq.base stdlib-shims.0.3.0 system-mingw.1 thread-table.1.0.0 topkg.1.1.1 tsort.2.2.0 uutf.1.0.4 yojson.3.0.0") (env CI true) (env OCAMLCI true) (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "opam update --depexts && opam install --cli=2.5 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS")) (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "opam install $DEPS")) (copy (src .) (dst /home/opam/src)) (run (shell "cd /home/opam/src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build")) ) 2026-02-27 11:56.58: Waiting for resource in pool OCluster 2026-02-27 11:56.58: Waiting for worker… 2026-02-27 13:09.05: Got resource from pool OCluster Building on ltsc2025-1 Initialized empty Git repository in C:/state/git/eio.git-2ac56b2ed1de05e0591ad64f831b4a4fd3ce42f2/.git/ HEAD is now at c44ee5c Merge pull request #822 from patricoferris/fiber-docs (from ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:fedecf8e7810af08d566e6e877bd4ed7ad4c107b8cc32164f71632fffceb8869) 2026-02-27 13:09.26 ---> using "a21c3d6a5c8ade59b5718498d4946f2d30bc2f15b3081890bc8673cc20de69f7" from cache C:/: (comment windows-server-mingw-ltsc2025-5.4_opam-2.5) C:/: (user (uid 1000) (gid 1000)) C:/: (env CLICOLOR_FORCE 1) C:/: (env OPAMCOLOR always) C:/: (run (shell "ln -f /usr/local/bin/opam-2.5 /usr/local/bin/opam")) 2026-02-27 13:09.26 ---> using "ba707ce1f62b585e8ecb40306d921206316b14fded440e6c49f33aa7897cc9c7" from cache C:/: (run (shell "opam init --reinit -ni")) No configuration file found, using built-in defaults. <><> Unix support infrastructure ><><><><><><><><><><><><><><><><><><><><><><><> opam and the OCaml ecosystem in general require various Unix tools in order to operate correctly. At present, this requires the installation of Cygwin to provide these tools. How should opam obtain Unix tools? > 1. Use tools found in PATH (Cygwin installation at C:\cygwin64) 2. Automatically create an internal Cygwin installation that will be managed by opam (recommended) 3. Use Cygwin installation found in C:\cygwin64 4. Use another existing Cygwin/MSYS2 installation 5. Abort initialisation [1/2/3/4/5] 1 Checking for available remotes: rsync and local, git. - you won't be able to use mercurial repositories unless you install the hg command on your system. - you won't be able to use darcs repositories unless you install the darcs command on your system. <><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><> [default] Initialised 2026-02-27 13:09.26 ---> using "dd67e9cc18682a923590cd564dd7cd6177b4afe1c25b1d53bacf8ae6b5b2364f" from cache C:/: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) CYGWIN_NT-10.0-26100 3.6.6-1.x86_64 The OCaml toplevel, version 5.4.0 2.5.0 2026-02-27 13:09.26 ---> using "c97059ecb6d76caa6ea35cf8e41cecaa775dc323c43ea7e5cc23418742ce7876" from cache C:/: (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "cd ~/opam-repository && (git cat-file -e ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 || git fetch origin master) && git reset -q --hard ff53f72a2370b4077c5d0df2664a9a52feb1d8c3 && git log --no-decorate -n1 --oneline && opam update -u")) ff53f72a23 Merge pull request #29372 from c-cube/release-containers-v3.18 <><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><> [default] synchronised from git+file://C:/cygwin64/home/opam/opam-repository Already up-to-date. Nothing to do. # To update the current shell environment, run: eval $(opam env) 2026-02-27 13:09.26 ---> using "75cf85b39a126b8cf46ac6b07cec41c06b963a65ca12cb95426c146437882f8e" from cache C:/: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam) (dst /home/opam/src/./)) 2026-02-27 13:11.02 ---> saved as "74fcfd85bc1e7a626bf1982139a17b1e3f749c983231647ecc7e42d400d47cf2" C:/: (run (network host) (shell "opam pin add -yn eio_windows.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_posix.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_main.dev '/home/opam/src/./' && \ \nopam pin add -yn eio_linux.dev '/home/opam/src/./' && \ \nopam pin add -yn eio.dev '/home/opam/src/./'")) [eio_windows.dev] synchronised (file://C:/home/opam/src) eio_windows is now pinned to file://C:/home/opam/src (version dev) [eio_posix.dev] synchronised (file://C:/home/opam/src) eio_posix is now pinned to file://C:/home/opam/src (version dev) [eio_main.dev] synchronised (file://C:/home/opam/src) eio_main is now pinned to file://C:/home/opam/src (version dev) [eio_linux.dev] synchronised (file://C:/home/opam/src) eio_linux is now pinned to file://C:/home/opam/src (version dev) [eio.dev] synchronised (file://C:/home/opam/src) eio is now pinned to file://C:/home/opam/src (version dev) 2026-02-27 13:13.44 ---> saved as "99e563aff948e79813612f2897be75c00934360685f7f0e448f073570b274d0c" C:/: (run (network host) (shell "echo '(lang dune 3.0)' > '/home/opam/src/./dune-project'")) /usr/bin/bash: line 1: /home/opam/src/./dune-project: No such file or directory "C:\cygwin64\bin\bash.exe" "-lc" "echo '(lang dune 3.0)' > '/home/opam/src/./dune-project'" failed with exit status 1 2026-02-27 13:14.53: Job failed: Failed: Build failed