2026-04-14 08:11.59: New job: test janestreet/spawn https://github.com/janestreet/spawn.git#refs/heads/master (fe3419b0db20819d7a31383544971e48a6dff20a) (windows-x86_64:windows-server-mingw-ltsc2025-5.4_opam-2.5) Base: ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:0e4fa08d05a319101c6ab90f612f6b79d83aa94d5df9b492774b9176694093e1 Opam project build To reproduce locally: git clone --recursive "https://github.com/janestreet/spawn.git" -b "master" && cd "spawn" && git reset --hard fe3419b0 cat > Dockerfile <<'END-OF-DOCKERFILE' FROM ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:0e4fa08d05a319101c6ab90f612f6b79d83aa94d5df9b492774b9176694093e1 # 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 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 || git fetch origin master) && git reset -q --hard 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 && git log --no-decorate -n1 --oneline && opam update -u COPY --chown=1000:1000 spawn.opam /cygwin64/home/opam/src/./ RUN opam pin add -yn spawn.dev '/cygwin64/home/opam/src/./' RUN echo '(lang dune 3.0)' > '/home/opam/src/./dune-project' ENV DEPS="arch-x86_64.1 base.v0.17.3 base-bigarray.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base conf-mingw-w64-gcc-x86_64.1 csexp.1.5.2 dune.3.22.2 dune-configurator.3.22.2 flexdll.0.44 host-arch-x86_64.1 host-system-mingw.1 jane-street-headers.v0.17.0 jst-config.v0.17.0 mingw-w64-shims.0.2.0 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-env-mingw64.1 ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1 ppx_assert.v0.17.0 ppx_base.v0.17.0 ppx_cold.v0.17.0 ppx_compare.v0.17.0 ppx_derivers.1.2.1 ppx_enumerate.v0.17.0 ppx_expect.v0.17.3 ppx_globalize.v0.17.2 ppx_hash.v0.17.0 ppx_here.v0.17.0 ppx_inline_test.v0.17.1 ppx_optcomp.v0.17.1 ppx_sexp_conv.v0.17.1 ppxlib.0.38.0 ppxlib_jane.v0.17.4 sexplib0.v0.17.0 stdio.v0.17.0 stdlib-shims.0.3.0 system-mingw.1 time_now.v0.17.0" ENV CI="true" ENV OCAMLCI="true" RUN opam update --depexts && opam install --cli=2.5 --depext-only -y spawn.dev $DEPS RUN opam install $DEPS COPY --chown=1000:1000 . /cygwin64/home/opam/src RUN cd /home/opam/src && opam exec -- dune build @install @check @runtest && rm -rf _build END-OF-DOCKERFILE docker build . END-REPRO-BLOCK 2026-04-14 08:11.59: Using cache hint "janestreet/spawn-ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:0e4fa08d05a319101c6ab90f612f6b79d83aa94d5df9b492774b9176694093e1-windows-server-mingw-ltsc2025-5.4_opam-2.5-283f7f6116ea96dcad11f9a292594ee4" 2026-04-14 08:11.59: Using OBuilder spec: ((from ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:0e4fa08d05a319101c6ab90f612f6b79d83aa94d5df9b492774b9176694093e1) (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 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 || git fetch origin master) && git reset -q --hard 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 && git log --no-decorate -n1 --oneline && opam update -u")) (copy (src spawn.opam) (dst /cygwin64/home/opam/src/./)) (run (network host) (shell "opam pin add -yn spawn.dev '/cygwin64/home/opam/src/./'")) (run (shell "echo '(lang dune 3.0)' > '/home/opam/src/./dune-project'")) (env DEPS "arch-x86_64.1 base.v0.17.3 base-bigarray.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base conf-mingw-w64-gcc-x86_64.1 csexp.1.5.2 dune.3.22.2 dune-configurator.3.22.2 flexdll.0.44 host-arch-x86_64.1 host-system-mingw.1 jane-street-headers.v0.17.0 jst-config.v0.17.0 mingw-w64-shims.0.2.0 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-env-mingw64.1 ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1 ppx_assert.v0.17.0 ppx_base.v0.17.0 ppx_cold.v0.17.0 ppx_compare.v0.17.0 ppx_derivers.1.2.1 ppx_enumerate.v0.17.0 ppx_expect.v0.17.3 ppx_globalize.v0.17.2 ppx_hash.v0.17.0 ppx_here.v0.17.0 ppx_inline_test.v0.17.1 ppx_optcomp.v0.17.1 ppx_sexp_conv.v0.17.1 ppxlib.0.38.0 ppxlib_jane.v0.17.4 sexplib0.v0.17.0 stdio.v0.17.0 stdlib-shims.0.3.0 system-mingw.1 time_now.v0.17.0") (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 spawn.dev $DEPS")) (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "opam install $DEPS")) (copy (src .) (dst /cygwin64/home/opam/src)) (run (shell "cd /home/opam/src && opam exec -- dune build @install @check @runtest && rm -rf _build")) ) 2026-04-14 08:11.59: Waiting for resource in pool OCluster 2026-04-14 10:29.23: Waiting for worker… 2026-04-14 20:38.48: Got resource from pool OCluster Building on ltsc2025-1 Initialized empty Git repository in C:/state/git/spawn.git-56102a0e1b5ecf832f090c986548470325fd7095/.git/ HEAD is now at fe3419b Do not require C99 mode for older GCC (#62) (from ocaml/opam:windows-server-mingw-ltsc2025-ocaml-5.4@sha256:0e4fa08d05a319101c6ab90f612f6b79d83aa94d5df9b492774b9176694093e1) 2026-04-14 20:39.19 ---> using "e6e8a2cf62a928430568e9b050d6cc986ddb11ca371f3b24e6b6f1ad80860153" 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")) 2026-04-14 20:39.19 ---> using "8371c7bbeda21231937607a48921d4490a1c9c23810f1d7416ef9e1aa874f8e3" 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 2026-04-14 20:39.19 ---> using "8bf506c77ce4ea2b6efe0b049434ba77c8ea5f4c0beccb9cedbfead0127ea0b7" from cache C:/: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) CYGWIN_NT-10.0-26100 3.6.7-1.x86_64 The OCaml toplevel, version 5.4.1 2.5.0 2026-04-14 20:39.19 ---> using "017acac92f6c222a89f675ad77684e3ed5874f73aa36dd7947a6dd1cf4a5b5c7" from cache C:/: (run (cache (opam-archives (target "c:\\opam\\.opam\\download-cache"))) (network host) (shell "cd ~/opam-repository && (git cat-file -e 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 || git fetch origin master) && git reset -q --hard 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 && git log --no-decorate -n1 --oneline && opam update -u")) From https://github.com/ocaml/opam-repository * branch master -> FETCH_HEAD 65664dc5b2..23068bb422 master -> origin/master 5f7bb1a6e6 Merge pull request #29704 from shonfeder/release-dune-3.22.2 <><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><> [default] synchronised from git+file://C:/cygwin64/home/opam/opam-repository Everything as up-to-date as possible However, you may "opam upgrade" these packages explicitly at these versions (e.g. "opam upgrade ocaml.5.5.0"), which will ask permission to downgrade or uninstall the conflicting packages. Nothing to do. # To update the current shell environment, run: eval $(opam env) 2026-04-14 20:39.19 ---> using "51cd6e7d9cd63d385c1da1b80ea3b175c1d55dd65f06b3b3be80f9d441a4f7b9" from cache C:/: (copy (src spawn.opam) (dst /cygwin64/home/opam/src/./)) 2026-04-14 20:40.04 ---> saved as "b960c94fb761b4b6bc875a4e5b8cff00bd41cf9f7a8016280902908a38be8a56" C:/: (run (network host) (shell "opam pin add -yn spawn.dev '/cygwin64/home/opam/src/./'")) [spawn.dev] synchronised (file://C:/cygwin64/home/opam/src) spawn is now pinned to file://C:/cygwin64/home/opam/src (version dev) 2026-04-14 20:46.25 ---> saved as "d1c1b4a7033cbdd96653c090f0c1f42d65952ef7720376e6798db7f109d90987" C:/: (run (shell "echo '(lang dune 3.0)' > '/home/opam/src/./dune-project'")) Failure("Failed to prepare snapshot obuilder-51c676fe905569e8a67936211d70d139897008fdbb17c5e27317627d2e70f766: \"ctr\" \"snapshot\" \"prepare\" \"--mounts\" \"obuilder-51c676fe905569e8a67936211d70d139897008fdbb17c5e27317627d2e70f766\" \"obuilder-d1c1b4a7033cbdd96653c090f0c1f42d65952ef7720376e6798db7f109d90987-committed\" failed with exit status 1") 2026-04-14 20:49.59: Job failed: Failed: Build failed