2025-09-27 20:51.22: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/575/head (62ee22e58f16b8ee2e9cbf4623b4ecd27cebdc14) (linux-x86_64:debian-12-5.3_opam-2.4) Base: ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746 Opam project build To reproduce locally: git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/575/head" && git reset --hard 62ee22e5 cat > Dockerfile <<'END-OF-DOCKERFILE' FROM ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746 # debian-12-5.3_opam-2.4 USER 1000:1000 ENV CLICOLOR_FORCE="1" ENV OPAMCOLOR="always" WORKDIR /src RUN sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam RUN opam init --reinit -ni RUN uname -rs && opam exec -- ocaml -version && opam --version WORKDIR /src RUN sudo chown opam /src RUN cd ~/opam-repository && (git cat-file -e 3f21ebe342ce440d9c9142ffe1185d8e5a326085 || git fetch origin master) && git reset -q --hard 3f21ebe342ce440d9c9142ffe1185d8e5a326085 && 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 ./ 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.1.9.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.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.1.3.0 conf-bash.1 containers.3.16 cppo.1.8.0 crowbar.0.2.1 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.3.20.2 dune-configurator.3.20.2 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.9.0 lwt-dllist.1.1.0 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.0.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 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.1.1.0 tsort.2.2.0 uring.0.9 uutf.1.0.4 yojson.3.0.0" ENV CI="true" ENV OCAMLCI="true" RUN opam update --depexts && opam install --cli=2.4 --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 2025-09-27 20:51.22: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746-debian-12-5.3_opam-2.4-eed4983df72e2b285acc49014263c8a9" 2025-09-27 20:51.22: Using OBuilder spec: ((from ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746) (comment debian-12-5.3_opam-2.4) (user (uid 1000) (gid 1000)) (env CLICOLOR_FORCE 1) (env OPAMCOLOR always) (workdir /src) (run (shell "sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam")) (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 "cd ~/opam-repository && (git cat-file -e 3f21ebe342ce440d9c9142ffe1185d8e5a326085 || git fetch origin master) && git reset -q --hard 3f21ebe342ce440d9c9142ffe1185d8e5a326085 && 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 ./)) (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 (network host) (shell "echo '(lang dune 3.0)' > './dune-project'")) (env DEPS "afl-persistent.1.4 alcotest.1.9.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.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.1.3.0 conf-bash.1 containers.3.16 cppo.1.8.0 crowbar.0.2.1 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.3.20.2 dune-configurator.3.20.2 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.9.0 lwt-dllist.1.1.0 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.0.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 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.1.1.0 tsort.2.2.0 uring.0.9 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=2.4 --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")) ) 2025-09-27 20:51.22: Waiting for resource in pool OCluster 2025-09-27 20:51.22: Waiting for worker… 2025-09-27 20:52.09: Got resource from pool OCluster Building on doris.caelum.ci.dev All commits already cached HEAD is now at 62ee22e fix up stub names and add tests (from ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746) Unable to find image 'ocaml/opam:debian-12-ocaml-5.3@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746' locally docker.io/ocaml/opam@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746: Pulling from ocaml/opam bbd0d7f7db1c: Pulling fs layer ee9c97cdac1d: Pulling fs layer d7590f38624d: Pulling fs layer 8909a03b3fd2: Pulling fs layer ec7935b352d1: Pulling fs layer 36bacfd14caa: Pulling fs layer cfd1d0bc0a25: Pulling fs layer 4b31c958145a: Pulling fs layer 8909a03b3fd2: Waiting cfd1d0bc0a25: Waiting d7590f38624d: Waiting 36bacfd14caa: Waiting ec7935b352d1: Waiting 4b31c958145a: Waiting ee9c97cdac1d: Verifying Checksum ee9c97cdac1d: Download complete d7590f38624d: Verifying Checksum d7590f38624d: Download complete 8909a03b3fd2: Verifying Checksum 8909a03b3fd2: Download complete ec7935b352d1: Verifying Checksum ec7935b352d1: Download complete 36bacfd14caa: Verifying Checksum 36bacfd14caa: Download complete cfd1d0bc0a25: Verifying Checksum cfd1d0bc0a25: Download complete 4b31c958145a: Verifying Checksum 4b31c958145a: Download complete bbd0d7f7db1c: Verifying Checksum bbd0d7f7db1c: Download complete bbd0d7f7db1c: Pull complete ee9c97cdac1d: Pull complete d7590f38624d: Pull complete 8909a03b3fd2: Pull complete ec7935b352d1: Pull complete 36bacfd14caa: Pull complete cfd1d0bc0a25: Pull complete 4b31c958145a: Pull complete Digest: sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746 Status: Downloaded newer image for ocaml/opam@sha256:ce109ed7a40b6b1bb0ad44021720e8dfea08fdd83f1f42dd0dbcf019bc7bf746 2025-09-27 21:01.38 ---> using "15aa1cf9b6eab837810155e26b0481282547cd1c9774850777b777a01817a556" from cache /: (comment debian-12-5.3_opam-2.4) /: (user (uid 1000) (gid 1000)) /: (env CLICOLOR_FORCE 1) /: (env OPAMCOLOR always) /: (workdir /src) /src: (run (shell "sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam")) 2025-09-27 21:01.38 ---> using "d98c74e8a1b39caaed0c5dd448b9f70838344d1f552593d4680215ce63cfc1d5" 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 2.0 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 71 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=71 --global Format upgrade done. <><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><> [default] Initialised 2025-09-27 21:01.38 ---> using "b985350161f8be0ac630962e60a51ca6dc32fd113681d699788b80061b4b8711" from cache /src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) Linux 5.15.0-142-generic The OCaml toplevel, version 5.3.0 2.4.1 2025-09-27 21:01.38 ---> using "e53dab84980c00a88614037e0f89115393a34d2a108068ce3ab080387dff902a" from cache /src: (workdir /src) /src: (run (shell "sudo chown opam /src")) 2025-09-27 21:01.38 ---> using "60ea2c52b2d08e1017910ce0e425fe6ad51f3a4d2a4f0f47c60b4d14327f0467" from cache /src: (run (cache (opam-archives (target /home/opam/.opam/download-cache))) (network host) (shell "cd ~/opam-repository && (git cat-file -e 3f21ebe342ce440d9c9142ffe1185d8e5a326085 || git fetch origin master) && git reset -q --hard 3f21ebe342ce440d9c9142ffe1185d8e5a326085 && git log --no-decorate -n1 --oneline && opam update -u")) From https://github.com/ocaml/opam-repository * branch master -> FETCH_HEAD ee24528071..f736a66f83 master -> origin/master 3f21ebe342 Merge pull request #28544 from vouillon/opam-publish-re.1.14.0 <><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><> [default] synchronised from git+file:///home/opam/opam-repository Already up-to-date. Nothing to do. # To update the current shell environment, run: eval $(opam env) 2025-09-27 21:01.38 ---> using "b8d898f6d3e96e2e183446ded5fc9cdc836f4070591621d48e150ed5257f7551" from cache /src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam) (dst ./)) 2025-09-27 21:01.38 ---> using "51b5de083327f0d8dd58ada1c2f0e0c072d580144c008d38fde7c878b8227428" 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) 2025-09-27 21:01.38 ---> using "f10f414d5170c8be6250a112d3852fca018445093aae4abd6c881e2ee733e464" from cache /src: (run (network host) (shell "echo '(lang dune 3.0)' > './dune-project'")) 2025-09-27 21:01.38 ---> using "2c122c2a18eb80a0bd30a9de105e83e7acb405b931c23960a05c89c3c7ce828b" from cache /src: (env DEPS "afl-persistent.1.4 alcotest.1.9.0 astring.0.8.5 backoff.0.1.1 base-bigarray.base base-bytes.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.1.3.0 conf-bash.1 containers.3.16 cppo.1.8.0 crowbar.0.2.1 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.3.20.2 dune-configurator.3.20.2 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 logs.0.9.0 lwt-dllist.1.1.0 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.0.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 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.1.1.0 tsort.2.2.0 uring.0.9 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=2.4 --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 bookworm InRelease [151 kB] - Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB] - Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB] - Get:4 http://deb.debian.org/debian bookworm/main amd64 Packages [8791 kB] - Get:5 http://deb.debian.org/debian-security bookworm-security/main amd64 Packages [280 kB] - Fetched 9326 kB in 8s (1120 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 5.3.0). [NOTE] Package ocaml-base-compiler is already installed (current version is 5.3.0). [NOTE] Package ocaml is already installed (current version is 5.3.0). [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). 2025-09-27 21:01.38 ---> using "d24a3afff94b783af28748db1bba225d4945841a026807589c0c2e2f912d172e" 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 5.3.0). [NOTE] Package ocaml-base-compiler is already installed (current version is 5.3.0). [NOTE] Package ocaml is already installed (current version is 5.3.0). [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 47 packages - install afl-persistent 1.4 - install alcotest 1.9.0 - install astring 0.8.5 - install backoff 0.1.1 - install base-bytes base - install bigstringaf 0.10.0 - install camlp-streams 5.0.1 - install cmdliner 1.3.0 - install conf-bash 1 - install containers 3.16 - install cppo 1.8.0 - install crowbar 0.2.1 - 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 3.20.2 - install dune-configurator 3.20.2 - 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 0.9.0 - install lwt-dllist 1.1.0 - install mdx 2.5.0 - install mtime 2.1.0 - install multicore-magic 2.3.1 - install ocaml-syntax-shims 1.0.0 - install ocaml-version 4.0.1 - install ocamlbuild 0.16.1 - install ocamlfind 1.9.8 - install ocplib-endian 1.2 - 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 1.1.0 - install tsort 2.2.0 - install uring 0.9 - install uutf 1.0.4 - install yojson 3.0.0 <><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><> -> retrieved afl-persistent.1.4 (cached) -> retrieved alcotest.1.9.0 (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) -> retrieved cmdliner.1.3.0 (cached) -> installed conf-bash.1 -> retrieved cppo.1.8.0 (cached) -> retrieved crowbar.0.2.1 (cached) -> retrieved csexp.1.5.2 (cached) -> retrieved containers.3.16 (cached) -> retrieved cstruct.6.2.0 (cached) -> retrieved domain-local-await.1.0.1 (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.0.9.0 (cached) -> retrieved lwt-dllist.1.1.0 (cached) -> retrieved mtime.2.1.0 (cached) -> retrieved multicore-magic.2.3.1 (cached) -> retrieved mdx.2.5.0 (cached) -> retrieved ocaml-syntax-shims.1.0.0 (cached) -> retrieved ocaml-version.4.0.1 (cached) -> retrieved ocamlbuild.0.16.1 (cached) -> retrieved ocamlfind.1.9.8 (cached) -> retrieved ocplib-endian.1.2 (cached) -> retrieved optint.0.3.0 (cached) -> retrieved oseq.0.5.1 (cached) -> retrieved psq.0.2.1 (cached) -> retrieved re.1.14.0 (cached) -> retrieved seq.base (cached) -> installed seq.base -> retrieved result.1.5 (cached) -> retrieved stdlib-shims.0.3.0 (cached) -> retrieved thread-table.1.0.0 (cached) -> retrieved tsort.2.2.0 (cached) -> retrieved topkg.1.1.0 (cached) -> retrieved uutf.1.0.4 (cached) -> retrieved yojson.3.0.0 (cached) -> retrieved dune.3.20.2, dune-configurator.3.20.2 (cached) -> retrieved uring.0.9 (cached) -> installed cmdliner.1.3.0 -> installed ocamlbuild.0.16.1 -> installed ocamlfind.1.9.8 -> installed base-bytes.base -> installed topkg.1.1.0 -> 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.0.9.0 -> installed dune.3.20.2 -> 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.2.3.1 -> installed ocaml-syntax-shims.1.0.0 -> installed ocaml-version.4.0.1 -> 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 ocplib-endian.1.2 -> installed domain-local-timeout.1.0.1 -> installed domain-local-await.1.0.1 -> installed crowbar.0.2.1 -> installed kcas.0.7.0 -> installed alcotest.1.9.0 -> installed dune-configurator.3.20.2 -> installed bigstringaf.0.10.0 -> installed mdx.2.5.0 -> installed iomux.0.4 -> installed containers.3.16 -> installed uring.0.9 -> installed dscheck.0.5.0 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 5.3.0+afl ocaml-variants.5.3.0+options ocaml-option-afl # To update the current shell environment, run: eval $(opam env) 2025-09-27 21:01.38 ---> using "0e14f54736ca50ac226358cdd13a4d268717098b99febdd0f74dbd0da8be1b32" from cache /src: (copy (src .) (dst /src)) 2025-09-27 21:01.38 ---> saved as "365e89e797bfe6fa3aec586d07e1879b1333d94232d3079af773289751ea3bd8" /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_read.exe) random ops: PASS (cd _build/default/fuzz && ./fuzz_buf_write.exe) random ops: PASS (cd _build/default/lib_eio_linux/tests && ./test.exe) Testing `eio_linux'. This run has ID `IVZ96AKU'. [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 0.005s. 11 tests run. 2025-09-27 21:01.44 ---> saved as "1364a13b418cd4841d6db2a6b020216b262938f74a9067f81587a70c6cebb8bf" Job succeeded 2025-09-27 21:01.44: Job succeeded