2026-02-28 13:55.34: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/832/head (7ce8ac1fb064153f73182dd3d410140001190954) (linux-x86_64:debian-13-5.2_opam-2.5) Base: ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380 Opam project build To reproduce locally: git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/832/head" && git reset --hard 7ce8ac1f cat > Dockerfile <<'END-OF-DOCKERFILE' FROM ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380 # debian-13-5.2_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 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 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 ./ 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-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 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.3.21.1 dune-configurator.3.21.1 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.2.5.1 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.2.1 ocaml-base-compiler.5.2.1 ocaml-config.3 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 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 2026-02-28 13:55.34: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380-debian-13-5.2_opam-2.5-6ab210a834be551757826a35f3c64976" 2026-02-28 13:55.34: Using OBuilder spec: ((from ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380) (comment debian-13-5.2_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 (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 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 ./)) (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-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 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.3.21.1 dune-configurator.3.21.1 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.2.5.1 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.2.1 ocaml-base-compiler.5.2.1 ocaml-config.3 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 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")) ) 2026-02-28 13:55.34: Waiting for resource in pool OCluster 2026-02-28 13:55.34: Waiting for worker… 2026-02-28 13:56.03: Got resource from pool OCluster Building on doris.caelum.ci.dev All commits already cached HEAD is now at 7ce8ac1 Simplify custom "env" type in example (from ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380) Unable to find image 'ocaml/opam:debian-13-ocaml-5.2@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380' locally docker.io/ocaml/opam@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380: Pulling from ocaml/opam ef235bf1a09a: Already exists 58b06b604a42: Already exists b55f23c32d5a: Already exists aa415425edb7: Already exists c4f39ed7469c: Already exists ca248a2fdd5e: Already exists 74109c509b2f: Already exists 18c2fa2271cb: Already exists 37d4d41661a2: Already exists 0b2f35f78814: Already exists e65f29522a9a: Already exists 603a51b67573: Already exists 89b2faa02f16: Already exists e5f11471afd4: Already exists d7b0e5daa224: Already exists 7bec4d50f3b2: Already exists d3a70ed71f1c: Already exists 90de03d9b27a: Already exists a28f685cf2db: Already exists 5bb5e02041c7: Already exists 74f9af816199: Already exists 74c2f6cb4138: Already exists 4f4fb700ef54: Already exists 5ce9bdcb2952: Already exists bf18c14e9b34: Already exists bb4b67501479: Already exists 89e7ed0468f5: Already exists 640077527026: Already exists 363b481ff012: Already exists 437bd8bc3ce9: Already exists 2bcf3429833a: Already exists 3e5fe21454e9: Already exists f3afb11ae499: Already exists c3a5b88f5e5f: Already exists 124a1dc355b1: Already exists 0a9982d37abd: Already exists 9b8b724665ed: Already exists f81507befe71: Already exists 7984e4546bf9: Already exists 3579b890ab6e: Already exists e83772930ba8: Already exists ae210f88246e: Already exists e035ef68bd1a: Already exists 10a755270a5b: Already exists 4e88e3f2e418: Pulling fs layer 2a347abb0f0e: Pulling fs layer 205140ded764: Pulling fs layer 9d67b414ca7f: Pulling fs layer 9d67b414ca7f: Waiting 2a347abb0f0e: Download complete 205140ded764: Verifying Checksum 205140ded764: Download complete 9d67b414ca7f: Verifying Checksum 9d67b414ca7f: Download complete 4e88e3f2e418: Verifying Checksum 4e88e3f2e418: Download complete 4e88e3f2e418: Pull complete 2a347abb0f0e: Pull complete 205140ded764: Pull complete 9d67b414ca7f: Pull complete Digest: sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380 Status: Downloaded newer image for ocaml/opam@sha256:4db7c316503ce7a09ae859eb15aafa663e4591ab53932f33bbbb2946375e1380 2026-02-28 13:56.03 ---> using "262e2e9a1f263a301af92c81a3ec80e6c72c0e5e6d4eb9e72b6a299adb3194e0" from cache /: (comment debian-13-5.2_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")) 2026-02-28 13:56.03 ---> using "799068c9bbeb6544990573ddf9b5b4560f215b027bd565e0a4cde589545836f5" 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 2026-02-28 13:56.28 ---> saved as "98b9de941dced35ec481ca226154bdb79a6df0548ba47c980e480b152ea02e28" /src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) Linux 6.8.0-94-generic The OCaml toplevel, version 5.2.1 2.5.0 2026-02-28 13:56.28 ---> saved as "b888da10954f3ab926c9539a013ae1dbce706d3a7a64017f573ab5e7a4f34036" /src: (workdir /src) /src: (run (shell "sudo chown opam /src")) 2026-02-28 13:56.29 ---> saved as "d68fa56d3e27a3638d98a87b9c8bc87f8d04fe60ca328862ab205fb3e7feaceb" /src: (run (cache (opam-archives (target /home/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")) From https://github.com/ocaml/opam-repository * branch master -> FETCH_HEAD 340ee6fd1f..ef5c0a2eb7 master -> origin/master ff53f72a23 Merge pull request #29372 from c-cube/release-containers-v3.18 <><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><> [default] synchronised from git+file:///home/opam/opam-repository Everything as up-to-date as possible (run with --verbose to show unavailable upgrades). However, you may "opam upgrade" these packages explicitly at these versions (e.g. "opam upgrade ocaml.5.4.0"), which will ask permission to downgrade or uninstall the conflicting packages. Nothing to do. # To update the current shell environment, run: eval $(opam env) 2026-02-28 13:56.53 ---> saved as "f943ed07ee092b0873d48d0f913703d8cea36af1c32341ec29049ca1f5fb200b" /src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam) (dst ./)) 2026-02-28 13:56.53 ---> saved as "9486d1aa93c62921868bb2350748ffb299b93eedc332f45b5faf905af87d0ebb" /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) 2026-02-28 13:57.02 ---> saved as "6640b4b25ce056bd57725561b06dad9c77386735d38373ae26c850604a0fd2c8" /src: (run (shell "echo '(lang dune 3.0)' > './dune-project'")) 2026-02-28 13:57.02 ---> saved as "a855b72c431e42e6af044eddf4fd53ef7ab60e97d4d03a337124ed200a6c17ef" /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-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.0 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.3.21.1 dune-configurator.3.21.1 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.2.5.1 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.2.1 ocaml-base-compiler.5.2.1 ocaml-config.3 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 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" - Hit:1 http://deb.debian.org/debian trixie InRelease - 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-security trixie-security/main amd64 Packages [113 kB] - Fetched 203 kB in 0s (1620 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-base-compiler is already installed (current version is 5.2.1). [NOTE] Package ocaml is already installed (current version is 5.2.1). [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-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) 2026-02-28 13:57.15 ---> saved as "144f756ce778b8e248b807d9cd753db75960264a76c1cfc7dabc9f2ff43367c1" /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-base-compiler is already installed (current version is 5.2.1). [NOTE] Package ocaml is already installed (current version is 5.2.1). [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-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 2.1.0 - 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 3.21.1 - install dune-configurator 3.21.1 - 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 2.5.1 - install mtime 2.1.0 - install multicore-magic 2.3.2 - install ocaml-syntax-shims 1.0.0 - install ocaml-version 4.0.3 - 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 cppo.1.8.0 (cached) -> retrieved cmdliner.2.1.0 (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 multicore-magic.2.3.2 (cached) -> retrieved ocaml-syntax-shims.1.0.0 (cached) -> retrieved mdx.2.5.1 (cached) -> retrieved ocaml-version.4.0.3 (cached) -> retrieved ocamlfind.1.9.8 (cached) -> retrieved ocamlbuild.0.16.1 (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.3.21.1, dune-configurator.3.21.1 (cached) -> installed cmdliner.2.1.0 -> 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.3.21.1 -> installed afl-persistent.1.4 -> installed either.1.0.0 -> installed backoff.0.1.1 -> installed csexp.1.5.2 -> installed camlp-streams.5.0.1 -> installed cppo.1.8.0 -> installed cstruct.6.2.0 -> installed lwt-dllist.1.1.0 -> installed multicore-magic.2.3.2 -> installed ocaml-syntax-shims.1.0.0 -> installed ocaml-version.4.0.3 -> 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 kcas.0.7.0 -> installed alcotest.1.9.1 -> installed dune-configurator.3.21.1 -> installed bigstringaf.0.10.0 -> installed mdx.2.5.1 -> installed iomux.0.4 -> installed containers.3.18 -> installed uring.2.7.0 -> 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 5.2.1+afl ocaml-variants.5.2.1+options ocaml-option-afl # To update the current shell environment, run: eval $(opam env) 2026-02-28 13:58.12 ---> saved as "63579a5436f6dca95d811a31e2870f3d8532ecc2d9d697bb556a09e182a84ec3" /src: (copy (src .) (dst /src)) 2026-02-28 13:58.13 ---> saved as "3a56ddfe3c2895303606dd8451d35951ca06374d5a035c929097c56b6a5279ad" /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 `65VZ9L7B'. [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 0.010s. 11 tests run. 2026-02-28 13:58.21 ---> saved as "e4a2d50d1543782b3d7d8e76ef051e9fb5c4adc01737da10760ab9f57ab6b40b" Job succeeded 2026-02-28 13:58.22: Job succeeded