2026-04-14 07:59.41: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/836/head (807ad3dd0c60e1892dae71706411eac219bbfb7c) (linux-x86_64:debian-13-5.2_opam-2.5)Base: ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0Opam project buildTo reproduce locally:git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/836/head" && git reset --hard 807ad3ddcat > Dockerfile <<'END-OF-DOCKERFILE'FROM ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0# debian-13-5.2_opam-2.5USER 1000:1000ENV CLICOLOR_FORCE="1"ENV OPAMCOLOR="always"WORKDIR /srcRUN sudo ln -f /usr/bin/opam-2.5 /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 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 || git fetch origin master) && git reset -q --hard 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 && 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-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.3.22.2 dune-configurator.3.22.2 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.2.5.2 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.4.0.4 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 $DEPSRUN opam install $DEPSCOPY --chown=1000:1000 . /srcRUN opam exec -- dune build @install @check @runtest && rm -rf _buildEND-OF-DOCKERFILEdocker build .END-REPRO-BLOCK2026-04-14 07:59.41: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0-debian-13-5.2_opam-2.5-b1ece7042a33481afefd4346e2949731"2026-04-14 07:59.41: Using OBuilder spec:((from ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0)(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 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 || git fetch origin master) && git reset -q --hard 5f7bb1a6e69f1ea15d8b2b08eeaa70a162c6fd41 && 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.3.22.2 dune-configurator.3.22.2 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.2.5.2 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.4.0.4 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")))2026-04-14 07:59.41: Waiting for resource in pool OCluster2026-04-14 08:28.49: Waiting for worker…2026-04-14 08:33.14: Got resource from pool OClusterBuilding on clete.caelum.ci.devAll commits already cachedHEAD is now at 807ad3d Make Linux and Posix eventfd functions configurable(from ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0)Unable to find image 'ocaml/opam:debian-13-ocaml-5.2@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0' locallydocker.io/ocaml/opam@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0: Pulling from ocaml/opam8f6ad858d0a4: Already exists9cb5e198c8cf: Already exists2d346d36dcf2: Already existscdc35e289b8d: Already existsaeb7244bb580: Already existsfc1943254a0d: Already exists84238c416f8e: Already existsfbbfe75d3112: Already exists221fdc5d9929: Already exists1fec9149b52a: Already exists9c6e52557f24: Already exists8737f5036aae: Already existsd69c4074de14: Already exists7237152a5f04: Already existsfba4b414d8a0: Already exists40d552afb3ef: Already exists077cc17dc8e4: Already exists077cc17dc8e4: Already exists169e1be36a55: Already exists0a8a005097ab: Already existscaba3ec4b361: Already exists6a364dc641f8: Already exists4f4fb700ef54: Already existsab8052928cdc: Already existsf5717a28dd6a: Already exists79233a9b9bed: Already existsd832d53e7392: Already exists1872dad82243: Already existsbfd849b08ba7: Already exists834a8024ef15: Already exists98ccec79258b: Already existsfb48f36a0542: Already exists3688b13db8e7: Already existsa5c099f5f72c: Already exists1ff1760de5b0: Already exists98eec6764aa5: Already existsaa22ae69debd: Already exists12bfb7b962a2: Already existsec25ce9bb816: Already existsbeadd3cf7357: Already existsd0d0c65a426d: Already exists515483e45ca3: Pulling fs layer661f20af1a8e: Pulling fs layer76308b68cccc: Pulling fs layer188a1be3940d: Pulling fs layer42df7319b6b4: Pulling fs layer188a1be3940d: Waitinga2d792fa2790: Pulling fs layer42df7319b6b4: Waitingd93e664bf0fb: Pulling fs layera2d792fa2790: Waitingd93e664bf0fb: Waiting515483e45ca3: Download complete515483e45ca3: Pull complete661f20af1a8e: Verifying Checksum661f20af1a8e: Download complete661f20af1a8e: Pull complete76308b68cccc: Download complete76308b68cccc: Pull complete42df7319b6b4: Verifying Checksum42df7319b6b4: Download completea2d792fa2790: Verifying Checksuma2d792fa2790: Download completed93e664bf0fb: Verifying Checksumd93e664bf0fb: Download complete188a1be3940d: Verifying Checksum188a1be3940d: Download complete188a1be3940d: Pull complete42df7319b6b4: Pull completea2d792fa2790: Pull completed93e664bf0fb: Pull completeDigest: sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b0Status: Downloaded newer image for ocaml/opam@sha256:e9e8a26d58179e75ca1525025bcc5dbbc56cd84f4176f8d1dcd97b95cde427b02026-04-14 08:33.14 ---> using "94a57a9c3527a48ab5d91602eeb79e35d18ff1f71260d38c89c82f7fbff465ae" 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"))2026-04-14 08:33.14 ---> using "b9d22a1bdc828a837b755057752c8957a4c5d15367e279844b1e37935ba1e128" 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] Initialised2026-04-14 08:33.14 ---> using "f56f445336b694ef3e451ab752adb2b680dbba91be01306fcf3529de7b6c3af8" from cache/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))Linux 6.8.0-107-genericThe OCaml toplevel, version 5.2.12.5.02026-04-14 08:33.14 ---> using "66c9846cb250aff6c9d4c0076257f7b5a327eb92fb547f9fc6af3270d11c0e86" from cache/src: (workdir /src)/src: (run (shell "sudo chown opam /src"))2026-04-14 08:33.14 ---> using "f7f47a5f8eba1682cf4d9599689e3879f7d007257dd68c96251b9d5742516c25" from cache/src: (run (cache (opam-archives (target /home/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_HEAD95972b8834..5f7bb1a6e6 master -> origin/master5f7bb1a6e6 Merge pull request #29704 from shonfeder/release-dune-3.22.2<><> 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.5.5.0"), 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 08:33.14 ---> using "af7aeca68ad973ef30237da7eae6f261a7bd53b1387178564e5933adf86d60a4" from cache/src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)(dst ./))2026-04-14 08:33.14 ---> using "746d0a3348f3bb4c34f2561a33388b7a58780a2f7b7e9f2f809a112c2702562f" 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)2026-04-14 08:33.14 ---> using "4948e2875c1bdcb7f58f7b8a482f20ea48f685cc29bed61a1796d44140493980" from cache/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))2026-04-14 08:33.14 ---> using "f883a7213879eac95969fb07a122a3a0b2decd9d22ed17d51711fc524c0ca191" 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-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.3.22.2 dune-configurator.3.22.2 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.2.5.2 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.4.0.4 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 [123 kB]- Fetched 213 kB in 0s (1284 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)2026-04-14 08:33.27 ---> saved as "61615be2a6c384e4ebfd917a8522d953676c9a74787bd55c2616836c88b05a15"/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 3.22.2- install dune-configurator 3.22.2- 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 2.5.2- install mtime 2.1.0- install multicore-magic 2.3.2- install ocaml-syntax-shims 1.0.0- install ocaml-version 4.0.4- 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 dscheck.0.5.0 (cached)-> retrieved containers.3.18 (cached)-> retrieved cstruct.6.2.0 (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.2.3.2 (cached)-> retrieved mdx.2.5.2 (cached)-> retrieved ocaml-syntax-shims.1.0.0 (cached)-> retrieved ocaml-version.4.0.4 (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 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.1.1.1 (cached)-> retrieved uutf.1.0.4 (cached)-> retrieved yojson.3.0.0 (cached)-> retrieved uring.2.7.0 (cached)-> retrieved dune.3.22.2, dune-configurator.3.22.2 (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 mtime.2.1.0-> installed fmt.0.11.0-> installed uutf.1.0.4-> installed astring.0.8.5-> installed logs.0.10.0-> installed dune.3.22.2-> 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 either.1.0.0-> installed lwt-dllist.1.1.0-> installed multicore-magic.2.3.2-> installed ocaml-syntax-shims.1.0.0-> installed ocaml-version.4.0.4-> installed optint.0.3.0-> installed oseq.0.5.1-> installed psq.0.2.1-> installed result.1.5-> installed stdlib-shims.0.3.0-> installed thread-table.1.0.0-> installed tsort.2.2.0-> installed re.1.14.0-> installed afl-persistent.1.4-> installed domain-local-await.1.0.1-> installed domain-local-timeout.1.0.1-> installed yojson.3.0.0-> installed crowbar.0.2.2-> installed kcas.0.7.0-> installed alcotest.1.9.1-> installed dune-configurator.3.22.2-> 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.2.7.0Done.<><> 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 5.2.1+afl ocaml-variants.5.2.1+options ocaml-option-afl# To update the current shell environment, run: eval $(opam env)2026-04-14 08:34.58 ---> saved as "329cbdffa8f08fc9b9960993c22ccaa51ff339849aa7e2bc985046fdebcb3b09"/src: (copy (src .) (dst /src))2026-04-14 08:34.59 ---> saved as "1b6427c18b36cf4b6a68d407191ba4124be9dd03edf9509b44cc64c495ab3c14"/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))(cd _build/default/fuzz && ./fuzz_buf_read.exe)random ops: PASS(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/lib_eio_linux/tests && ./test.exe)Testing `eio_linux'.This run has ID `UVKFNQON'.[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 0.027s. 11 tests run.2026-04-14 08:35.24 ---> saved as "9fcf77783b8bd121477b3ec4f469ed780918b8075aec0a9e363052e6525f8efa"Job succeeded2026-04-14 08:35.24: Job succeeded