2026-01-08 02:35.36: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/827/head (6b7123d65223a5961db7e4de39f1fb1931d85487) (linux-x86_64:debian-13-5.3_opam-2.4)Base: ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9Opam project buildTo reproduce locally:git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/827/head" && git reset --hard 6b7123d6cat > Dockerfile <<'END-OF-DOCKERFILE'FROM ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9# debian-13-5.3_opam-2.4USER 1000:1000ENV CLICOLOR_FORCE="1"ENV OPAMCOLOR="always"WORKDIR /srcRUN sudo ln -f /usr/bin/opam-2.4 /usr/bin/opamRUN opam init --reinit -niRUN uname -rs && opam exec -- ocaml -version && opam --versionWORKDIR /srcRUN sudo chown opam /srcRUN cd ~/opam-repository && (git cat-file -e c65fcb116531ae66ad3316b265e233443ef25044 || git fetch origin master) && git reset -q --hard c65fcb116531ae66ad3316b265e233443ef25044 && git log --no-decorate -n1 --oneline && opam update -uCOPY --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.2.1.0 conf-bash.1 containers.3.16 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.3.20.2 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.0.10.0 lwt-dllist.1.1.0 mdx.2.5.1 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.4.0.3 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=2.4 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio_linux.dev eio.dev $DEPSRUN opam install $DEPSCOPY --chown=1000:1000 . /srcRUN opam exec -- dune build @install @check @runtest && rm -rf _buildEND-OF-DOCKERFILEdocker build .END-REPRO-BLOCK2026-01-08 02:35.36: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9-debian-13-5.3_opam-2.4-b59d3096d74e5ccb089ddc28b241bc60"2026-01-08 02:35.36: Using OBuilder spec:((from ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9)(comment debian-13-5.3_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 c65fcb116531ae66ad3316b265e233443ef25044 || git fetch origin master) && git reset -q --hard c65fcb116531ae66ad3316b265e233443ef25044 && 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.1.9.1 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 containers.3.16 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.3.20.2 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.0.10.0 lwt-dllist.1.1.0 mdx.2.5.1 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.4.0.3 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=2.4 --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")))2026-01-08 02:35.36: Waiting for resource in pool OCluster2026-01-08 02:35.36: Waiting for worker…2026-01-08 02:35.36: Got resource from pool OClusterBuilding on cletehint: Using 'master' as the name for the initial branch. This default branch namehint: is subject to change. To configure the initial branch name to use in allhint: of your new repositories, which will suppress this warning, call:hint:hint: git config --global init.defaultBranch <name>hint:hint: Names commonly chosen instead of 'master' are 'main', 'trunk' andhint: 'development'. The just-created branch can be renamed via this command:hint:hint: git branch -m <name>Initialized empty Git repository in /var/cache/obuilder/ocluster/git/eio.git-2ac56b2ed1de05e0591ad64f831b4a4fd3ce42f2/.git/HEAD is now at 6b7123d Support writing to block devices on MacOS(from ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9)Unable to find image 'ocaml/opam:debian-13-ocaml-5.3@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9' locallydocker.io/ocaml/opam@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9: Pulling from ocaml/opam2981f7e8980b: Already exists9c63e1c4ba84: Already exists02578b9c9f1b: Already exists3801cb7ba5e6: Already exists1c4cdedd39f1: Already exists40f6006c5f5a: Already existsc451a17216ec: Already existse4104b8f72ee: Already exists7c7dbc5e7919: Already existsaa82be714e7c: Already exists922520f12384: Already exists9bfea042cef8: Already exists1244979f7c21: Already exists7583a0e34f94: Already exists14bef3f2665a: Already exists3a4b42ce6cb5: Already existsb0a08a900877: Already existsb0a08a900877: Already exists16ac87e68d60: Already exists74ac6e8c9b82: Already existsb41290a57dc5: Already exists592e5bcb7159: Already exists4f4fb700ef54: Already exists1db0705661a3: Already exists76bb8e35b9cc: Already exists3bc9d98c3b49: Already exists7096ef42e6c0: Already existscd0e70de8125: Already exists23ffab57f98e: Already existsb974353d8023: Already existsc74fba566723: Already exists5ad399846f45: Already exists3e7203fa3980: Already exists0b8915d2a92b: Already existse68c7a56c438: Already exists9024d680a167: Already exists3c7c73421b6e: Already exists7134fa9b4278: Already exists9d94fb523099: Already exists20d06dbdae7e: Already existsb9a45e537661: Already existsa08a9a974983: Already exists8924679c4512: Already exists768c99fc4263: Already exists215f2d760d2b: Already exists7de9823e1d22: Already exists84f9df68c39c: Already exists4989e85de92f: Already existsDigest: sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd9Status: Downloaded newer image for ocaml/opam@sha256:82862fdd2735789b1bfd7b572e93c7d8b36bb89223e583c9d778b90ebac71bd92026-01-08 02:35.38 ---> using "3c7396f7f2e012a60dc7c5964d5e4dd32d367437374fe9f1ba725dd799a085cd" from cache/: (comment debian-13-5.3_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"))2026-01-08 02:35.38 ---> using "188bd13278d51487628e3c8152a284ce0ca6b17296046e8f27a5dc2b2c5b1e02" 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] yFormat upgrade done.<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>[default] Initialised2026-01-08 02:35.38 ---> using "b3fbfaff4a9ca4f50c88ca3ccadcd3fa16292ff452d7cb5695ae32362ba915fc" from cache/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))Linux 6.8.0-90-genericThe OCaml toplevel, version 5.3.02.4.12026-01-08 02:35.38 ---> using "504891920889c70afa45657726e85c2da1fdf105eecdc6f5dbca134fcb43cffe" from cache/src: (workdir /src)/src: (run (shell "sudo chown opam /src"))2026-01-08 02:35.38 ---> using "b020eb0e4ebb4de43d64a706ab7b7bd0fa2ba0377a0bc2872997ff47f4a03026" from cache/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))(network host)(shell "cd ~/opam-repository && (git cat-file -e c65fcb116531ae66ad3316b265e233443ef25044 || git fetch origin master) && git reset -q --hard c65fcb116531ae66ad3316b265e233443ef25044 && git log --no-decorate -n1 --oneline && opam update -u"))From https://github.com/ocaml/opam-repository* branch master -> FETCH_HEADee48e882f0..2dee2fe30d master -> origin/masterc65fcb1165 Merge pull request #29080 from dra27/ocaml-config-urls<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>[default] synchronised from git+file:///home/opam/opam-repositoryEverything 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)2026-01-08 02:35.57 ---> saved as "dfa5fff99960adf86ef947027971b2f06bce41b1dcd07e960edd40aa4eb6189e"/src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)(dst ./))2026-01-08 02:35.57 ---> saved as "9d216e254cc4cfa7baf7058eaa53c0da6fa47bac5b6b036affb88dc1957be27b"/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)2026-01-08 02:36.03 ---> saved as "9b53977e1eb508d9b238c4f4a7d8eb32cbdd9ab227c06bf4e22aca7d7d51452b"/src: (run (network host)(shell "echo '(lang dune 3.0)' > './dune-project'"))2026-01-08 02:36.03 ---> saved as "2fb00c1e3002e2cc5a3aa42fae096fa4eb38613ba2bb129fd75997ff6460d246"/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.2.1.0 conf-bash.1 containers.3.16 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.3.20.2 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.0.10.0 lwt-dllist.1.1.0 mdx.2.5.1 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.4.0.3 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=2.4 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio_linux.dev eio.dev $DEPS"))+ /usr/bin/sudo "apt-get" "update"- 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 [94.5 kB]- Fetched 185 kB in 0s (1732 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).2026-01-08 02:36.12 ---> saved as "e1961279cd9e9e0f44398914c9c38c6f6d6cf4784119749f8b582b2983060083"/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 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 3.16- 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 3.20.2- 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 0.10.0- install lwt-dllist 1.1.0- install mdx 2.5.1- install mtime 2.1.0- install multicore-magic 2.3.1- 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 domain-local-timeout.1.0.1 (cached)-> retrieved containers.3.16 (cached)-> retrieved cstruct.6.2.0 (cached)-> retrieved dscheck.0.5.0 (cached)-> retrieved either.1.0.0 (cached)-> retrieved hmap.0.8.1 (cached)-> retrieved fmt.0.11.0 (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.2.3.1 (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.3.20.2, dune-configurator.3.20.2 (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.3.20.2-> 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.4.0.3-> 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.3.20.2-> installed bigstringaf.0.10.0-> installed mdx.2.5.1-> installed iomux.0.4-> installed containers.3.16-> installed dscheck.0.5.0-> installed uring.2.7.0Done.<><> afl-persistent.1.4 installed successfully ><><><><><><><><><><><><><><><><>=> afl-persistent is installed, but since the current OCaml compiler doesnot enable AFL instrumentation by default, most packages will not beinstrumented 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)2026-01-08 02:36.49 ---> saved as "a24cd02b6e0d733569659ffe74f883ef831e7b5b945ef4adf876cb926a8719dc"/src: (copy (src .) (dst /src))2026-01-08 02:36.50 ---> saved as "fdceab59596aaa01b57628b1c9a17d6709b231cb94eb67802e608a021f890c2c"/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 `FTJRTLT5'.[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.2026-01-08 02:36.56 ---> saved as "02603735249034794a3f504ffe7c96bed91cf34c2cbb31dde31850d11a3af957"Job succeeded2026-01-08 02:36.56: Job succeeded