Organisationsocaml-multicoreeioc25508 ()debian-13-5.4_arm64_opam-2.5

debian-13-5.4_arm64_opam-2.5

Logs

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2026-05-22 09:48.51: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/heads/main (c25508310db29ed510511cc28456eefe4abd16ca) (linux-arm64:debian-13-5.4_arm64_opam-2.5)
Base: ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53
Opam project build

To reproduce locally:

git clone --recursive "https://github.com/ocaml-multicore/eio.git" -b "main" && cd "eio" && git reset --hard c2550831
cat > Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53
# debian-13-5.4_arm64_opam-2.5
USER 1000:1000
ENV CLICOLOR_FORCE="1"
ENV OPAMCOLOR="always"
WORKDIR /src
RUN sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam
RUN cd ~/opam-repository && (git cat-file -e c180e1630960e0dbb8e30c22b3de89113eb5cc93 || git fetch origin master) && git reset -q --hard c180e1630960e0dbb8e30c22b3de89113eb5cc93 && git log --no-decorate -n1 --oneline
RUN opam init --reinit -ni
RUN uname -rs && opam exec -- ocaml -version && opam --version
WORKDIR /src
RUN sudo chown opam /src
RUN opam update -u
COPY --chown=1000:1000 eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam ./
RUN opam pin add -yn eio_windows.dev './' && \
    opam pin add -yn eio_posix.dev './' && \
    opam pin add -yn eio_main.dev './' && \
    opam pin add -yn eio_linux.dev './' && \
    opam pin add -yn eio.dev './'
RUN echo '(lang dune 3.0)' > './dune-project'
ENV DEPS="afl-persistent.1.4 alcotest.1.9.1 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.2.1.1 conf-bash.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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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 thread-table.1.0.0 topkg.1.1.1 tsort.2.2.0 uring.2.7.0 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_linux.dev eio.dev $DEPS
RUN opam install $DEPS
COPY --chown=1000:1000 . /src
RUN opam exec -- dune build @install @check @runtest && rm -rf _build

END-OF-DOCKERFILE
docker build .
END-REPRO-BLOCK

2026-05-22 09:48.51: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53-debian-13-5.4_arm64_opam-2.5-e524e996c42a569c6e5f5979f115e97f"
2026-05-22 09:48.51: Using OBuilder spec:
((from ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53)
 (comment debian-13-5.4_arm64_opam-2.5)
 (user (uid 1000) (gid 1000))
 (env CLICOLOR_FORCE 1)
 (env OPAMCOLOR always)
 (workdir /src)
 (run (shell "sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "cd ~/opam-repository && (git cat-file -e c180e1630960e0dbb8e30c22b3de89113eb5cc93 || git fetch origin master) && git reset -q --hard c180e1630960e0dbb8e30c22b3de89113eb5cc93 && git log --no-decorate -n1 --oneline"))
 (run (shell "opam init --reinit -ni"))
 (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
 (workdir /src)
 (run (shell "sudo chown opam /src"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "opam update -u"))
 (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
       (dst ./))
 (run (network host)
      (shell  "opam pin add -yn eio_windows.dev './' && \
             \nopam pin add -yn eio_posix.dev './' && \
             \nopam pin add -yn eio_main.dev './' && \
             \nopam pin add -yn eio_linux.dev './' && \
             \nopam pin add -yn eio.dev './'"))
 (run (shell "echo '(lang dune 3.0)' > './dune-project'"))
 (env DEPS "afl-persistent.1.4 alcotest.1.9.1 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.2.1.1 conf-bash.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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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 thread-table.1.0.0 topkg.1.1.1 tsort.2.2.0 uring.2.7.0 uutf.1.0.4 yojson.3.0.0")
 (env CI true)
 (env OCAMLCI true)
 (run (cache (opam-archives (target /home/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_linux.dev eio.dev $DEPS"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "opam install $DEPS"))
 (copy (src .) (dst /src))
 (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))
)

2026-05-22 09:48.51: Waiting for resource in pool OCluster
2026-05-22 11:24.51: Waiting for worker…
2026-05-22 11:39.37: Got resource from pool OCluster
Building on ainia.caelum.ci.dev
All commits already cached
HEAD is now at c255083 Merge pull request #833 from m-click/unlink-missing-ok

(from ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53)
Unable to find image 'ocaml/opam:debian-13-ocaml-5.4@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53' locally
docker.io/ocaml/opam@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53: Pulling from ocaml/opam
Digest: sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53
Status: Downloaded newer image for ocaml/opam@sha256:8cbe556b3ab937178ccd009e1decc9400f259c616fa75b1b75319f5f84fc8e53
2026-05-22 11:39.37 ---> using "974e1377df549f961c69c901e3ebf336304da0bb1cf662b85e8b60041eb05abc" from cache

/: (comment debian-13-5.4_arm64_opam-2.5)

/: (user (uid 1000) (gid 1000))

/: (env CLICOLOR_FORCE 1)

/: (env OPAMCOLOR always)

/: (workdir /src)

/src: (run (shell "sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam"))
2026-05-22 11:39.37 ---> using "d007d15fb2299236b0ee361ffb51324c3f345e0170c4a5bf1c57c476d03adad9" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "cd ~/opam-repository && (git cat-file -e c180e1630960e0dbb8e30c22b3de89113eb5cc93 || git fetch origin master) && git reset -q --hard c180e1630960e0dbb8e30c22b3de89113eb5cc93 && git log --no-decorate -n1 --oneline"))
From https://github.com/ocaml/opam-repository
 * branch                  master     -> FETCH_HEAD
   fc08333d1b..3e30e43808  master     -> origin/master
c180e16309 Merge pull request #29907 from dra27/host-arch-fixes
2026-05-22 11:39.37 ---> using "44bd2d68cf5e4616332e9feaa7225ed3f93a4ac0d7f6ce8974a63e91375c0875" from cache

/src: (run (shell "opam init --reinit -ni"))
Configuring from /home/opam/.opamrc and then from built-in defaults.
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.

This version of opam requires an update to the layout of /home/opam/.opam from version 2.1 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [Y/n] y
[NOTE] The 'jobs' option was reset, its value was 1 and its new value will vary according to the current number of cores on your machine. You can restore the fixed value using:
           opam option jobs=1 --global
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from git+file:///home/opam/opam-repository
2026-05-22 11:39.37 ---> using "fd741f110f8d87d5136dc8e16941a5b8424834fc1a9f964269887b57116511e7" from cache

/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
Linux 6.8.0-111-generic
The OCaml toplevel, version 5.4.1
2.5.1
2026-05-22 11:39.37 ---> using "a2a16bb3abe563ede2fba98ed95c3eafebaac4d4401c568b0b6df3e13eb0dce6" from cache

/src: (workdir /src)

/src: (run (shell "sudo chown opam /src"))
2026-05-22 11:39.37 ---> using "4892f8fd6a5f75448a03bb3de06cb6f6723d173f3faa35b17c28f3107fa4c765" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "opam update -u"))

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] no changes from git+file:///home/opam/opam-repository

Everything as up-to-date as possible

The following packages are not being upgraded because the new versions conflict with other installed packages:
  - ocaml.5.5.0
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)
2026-05-22 11:39.37 ---> using "f49a7cbdbca068c497ae35d2c77adaec81149ca5c19ac6f3779541277088da08" from cache

/src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
            (dst ./))
2026-05-22 11:39.37 ---> using "4917dacc6c41300433ba044921f04cf5f7cad480079222d2db35de6efc6df2c2" from cache

/src: (run (network host)
           (shell  "opam pin add -yn eio_windows.dev './' && \
                  \nopam pin add -yn eio_posix.dev './' && \
                  \nopam pin add -yn eio_main.dev './' && \
                  \nopam pin add -yn eio_linux.dev './' && \
                  \nopam pin add -yn eio.dev './'"))
[eio_windows.dev] synchronised (file:///src)
eio_windows is now pinned to file:///src (version dev)
[eio_posix.dev] synchronised (file:///src)
eio_posix is now pinned to file:///src (version dev)
[eio_main.dev] synchronised (file:///src)
eio_main is now pinned to file:///src (version dev)
[eio_linux.dev] synchronised (file:///src)
eio_linux is now pinned to file:///src (version dev)
[eio.dev] synchronised (file:///src)
eio is now pinned to file:///src (version dev)
2026-05-22 11:39.37 ---> using "5114e259b812e1e0caed1239c6d206de9e73eb4afc5e1d89573156781a258f63" from cache

/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))
2026-05-22 11:39.37 ---> using "7f49499c62a10c1c13581d6a9ac424590a1a16e9d6e93f1cc31681cd472f609c" from cache

/src: (env DEPS "afl-persistent.1.4 alcotest.1.9.1 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.2.1.1 conf-bash.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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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 thread-table.1.0.0 topkg.1.1.1 tsort.2.2.0 uring.2.7.0 uutf.1.0.4 yojson.3.0.0")

/src: (env CI true)

/src: (env OCAMLCI true)

/src: (run (cache (opam-archives (target /home/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_linux.dev eio.dev $DEPS"))
+ /usr/bin/sudo "apt-get" "update"
- Get:1 http://deb.debian.org/debian trixie InRelease [140 kB]
- Get:2 http://deb.debian.org/debian trixie-updates InRelease [47.3 kB]
- Get:3 http://deb.debian.org/debian-security trixie-security InRelease [43.4 kB]
- Get:4 http://deb.debian.org/debian trixie/main arm64 Packages [9608 kB]
- Get:5 http://deb.debian.org/debian-security trixie-security/main arm64 Packages [166 kB]
- Fetched 10.0 MB in 37s (270 kB/s)
- Reading package lists...

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[eio.dev] synchronised (file:///src)
[eio_linux.dev] synchronised (file:///src)
[eio_main.dev] synchronised (file:///src)
[eio_posix.dev] synchronised (file:///src)
[eio_windows.dev] synchronised (file:///src)

[NOTE] Package ocaml-options-vanilla is already installed (current version is 1).
[NOTE] Package ocaml-config is already installed (current version is 3).
[NOTE] Package ocaml-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml is already installed (current version is 5.4.1).
[NOTE] Package base-unix is already installed (current version is base).
[NOTE] Package base-threads is already installed (current version is base).
[NOTE] Package base-nnp is already installed (current version is base).
[NOTE] Package base-effects is already installed (current version is base).
[NOTE] Package base-domains is already installed (current version is base).
[NOTE] Package base-bigarray is already installed (current version is base).
# To update the current shell environment, run: eval $(opam env)
2026-05-22 11:39.37 ---> using "20368b9b34b6ca9c07b816681e604e86794ddebd91684545688154a66eee5c1f" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "opam install $DEPS"))
[NOTE] Package ocaml-options-vanilla is already installed (current version is 1).
[NOTE] Package ocaml-config is already installed (current version is 3).
[NOTE] Package ocaml-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml is already installed (current version is 5.4.1).
[NOTE] Package base-unix is already installed (current version is base).
[NOTE] Package base-threads is already installed (current version is base).
[NOTE] Package base-nnp is already installed (current version is base).
[NOTE] Package base-effects is already installed (current version is base).
[NOTE] Package base-domains is already installed (current version is base).
[NOTE] Package base-bigarray is already installed (current version is base).
The following actions will be performed:
=== install 45 packages
  - install afl-persistent       1.4
  - install alcotest             1.9.1
  - install astring              0.8.5
  - install backoff              0.1.1
  - install bigstringaf          0.10.0
  - install camlp-streams        5.0.1
  - install cmdliner             2.1.1
  - install conf-bash            1
  - install containers           3.18
  - install cppo                 1.8.0
  - install crowbar              0.2.2
  - install csexp                1.5.2
  - install cstruct              6.2.0
  - install domain-local-await   1.0.1
  - install domain-local-timeout 1.0.1
  - install dscheck              0.5.0
  - install dune                 3.23.1
  - install dune-configurator    3.23.1
  - install either               1.0.0
  - install fmt                  0.11.0
  - install hmap                 0.8.1
  - install iomux                0.4
  - install kcas                 0.7.0
  - install logs                 0.10.0
  - install lwt-dllist           1.1.0
  - install mdx                  2.5.2
  - install mtime                2.1.0
  - install multicore-magic      2.3.2
  - install ocaml-syntax-shims   1.0.0
  - install ocaml-version        4.1.1
  - install ocamlbuild           0.16.1
  - install ocamlfind            1.9.8
  - install optint               0.3.0
  - install oseq                 0.5.1
  - install psq                  0.2.1
  - install re                   1.14.0
  - install result               1.5
  - install seq                  base
  - install stdlib-shims         0.3.0
  - install thread-table         1.0.0
  - install topkg                1.1.1
  - install tsort                2.2.0
  - install uring                2.7.0
  - install uutf                 1.0.4
  - install yojson               3.0.0

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved afl-persistent.1.4  (cached)
-> retrieved alcotest.1.9.1  (cached)
-> retrieved astring.0.8.5  (cached)
-> retrieved backoff.0.1.1  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved camlp-streams.5.0.1  (cached)
-> installed conf-bash.1
-> retrieved cmdliner.2.1.1  (cached)
-> retrieved cppo.1.8.0  (cached)
-> retrieved crowbar.0.2.2  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved domain-local-await.1.0.1  (cached)
-> retrieved containers.3.18  (cached)
-> retrieved cstruct.6.2.0  (cached)
-> retrieved domain-local-timeout.1.0.1  (cached)
-> retrieved dscheck.0.5.0  (cached)
-> retrieved either.1.0.0  (cached)
-> retrieved fmt.0.11.0  (cached)
-> retrieved hmap.0.8.1  (cached)
-> retrieved iomux.0.4  (cached)
-> retrieved kcas.0.7.0  (cached)
-> retrieved logs.0.10.0  (cached)
-> retrieved lwt-dllist.1.1.0  (cached)
-> retrieved mtime.2.1.0  (cached)
-> retrieved mdx.2.5.2  (cached)
-> retrieved multicore-magic.2.3.2  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml-version.4.1.1  (cached)
-> retrieved ocamlbuild.0.16.1  (cached)
-> retrieved ocamlfind.1.9.8  (cached)
-> retrieved optint.0.3.0  (cached)
-> retrieved oseq.0.5.1  (cached)
-> retrieved psq.0.2.1  (cached)
-> retrieved result.1.5  (cached)
-> retrieved seq.base  (cached)
-> installed seq.base
-> retrieved re.1.14.0  (cached)
-> retrieved stdlib-shims.0.3.0  (cached)
-> retrieved thread-table.1.0.0  (cached)
-> retrieved tsort.2.2.0  (cached)
-> retrieved topkg.1.1.1  (cached)
-> retrieved uutf.1.0.4  (cached)
-> retrieved yojson.3.0.0  (cached)
-> retrieved uring.2.7.0  (cached)
-> retrieved dune.3.23.1, dune-configurator.3.23.1  (cached)
-> installed cmdliner.2.1.1
-> installed ocamlbuild.0.16.1
-> installed ocamlfind.1.9.8
-> installed topkg.1.1.1
-> installed hmap.0.8.1
-> installed uutf.1.0.4
-> installed mtime.2.1.0
-> installed fmt.0.11.0
-> installed astring.0.8.5
-> installed logs.0.10.0
-> installed dune.3.23.1
-> installed afl-persistent.1.4
-> installed lwt-dllist.1.1.0
-> installed csexp.1.5.2
-> installed backoff.0.1.1
-> installed camlp-streams.5.0.1
-> installed cppo.1.8.0
-> installed cstruct.6.2.0
-> installed either.1.0.0
-> installed multicore-magic.2.3.2
-> installed ocaml-syntax-shims.1.0.0
-> installed ocaml-version.4.1.1
-> installed optint.0.3.0
-> installed oseq.0.5.1
-> installed psq.0.2.1
-> installed re.1.14.0
-> installed result.1.5
-> installed stdlib-shims.0.3.0
-> installed thread-table.1.0.0
-> installed tsort.2.2.0
-> installed yojson.3.0.0
-> installed crowbar.0.2.2
-> installed domain-local-timeout.1.0.1
-> installed domain-local-await.1.0.1
-> installed dune-configurator.3.23.1
-> installed kcas.0.7.0
-> installed alcotest.1.9.1
-> installed bigstringaf.0.10.0
-> installed iomux.0.4
-> installed mdx.2.5.2
-> installed containers.3.18
-> installed dscheck.0.5.0
-> installed uring.2.7.0
Done.

<><> afl-persistent.1.4 installed successfully ><><><><><><><><><><><><><><><><>
=> afl-persistent is installed, but since the current OCaml compiler does
   not enable AFL instrumentation by default, most packages will not be
   instrumented and fuzzing with afl-fuzz may not be effective.

   To globally enable AFL instrumentation, create an OCaml switch like:

     opam switch create 5.4.1+afl ocaml-variants.5.4.1+options ocaml-option-afl
# To update the current shell environment, run: eval $(opam env)
2026-05-22 11:40.04 ---> saved as "9b6e20698245ed6b09bfd9cef0384da7608a8518d8b7a4fd8b422a357575fdc7"

/src: (copy (src .) (dst /src))
2026-05-22 11:40.04 ---> saved as "97f297db44acf06e9751cea59d2400532329c02d95b6725c7bd35df02ddf9d6a"

/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))
(cd _build/default/fuzz && ./fuzz_inherit_fds.exe)
inherit_fds: PASS

(cd _build/default/fuzz && ./fuzz_buf_write.exe)
random ops: PASS

(cd _build/default/fuzz && ./fuzz_buf_read.exe)
random ops: PASS

(cd _build/default/lib_eio_linux/tests && ./test.exe)
Testing `eio_linux'.
This run has ID `HS52Q0IT'.

  [OK]          io          0   copy.
  [OK]          io          1   direct_copy.
  [OK]          io          2   poll_add.
  [OK]          io          3   poll_add_busy.
  [OK]          io          4   iovec.
  [OK]          io          5   no_sqe.
  [OK]          io          6   read_exact.
  [OK]          io          7   expose_backend.
  [OK]          io          8   statx.
  [OK]          io          9   signal_race.
  [OK]          io         10   alloc-fixed-or-wait.

Full test results in `/src/_build/default/lib_eio_linux/tests/_build/_tests/eio_linux'.
Test Successful in 0.006s. 11 tests run.
2026-05-22 11:40.11 ---> saved as "5dab40c4d0e8a4d57bb3697dda75cba2e7ff7301222e4474f001311f7f8389a1"
Job succeeded
2026-05-22 11:40.11: Job succeeded