2026-03-23 09:27.07: New job: test ocaml-multicore/lwt_eio https://github.com/ocaml-multicore/lwt_eio.git#refs/heads/master (e3679c5296dd0aacac825735dab45ded26d55821) (linux-x86_64:debian-13-5.3_opam-2.5)Base: ocaml/opam:debian-13-ocaml-5.3@sha256:d68d2901c08ff08c488598e952eb1fdf628ab2d548c42615080cd232ee37a8d1Opam project buildTo reproduce locally:git clone --recursive "https://github.com/ocaml-multicore/lwt_eio.git" -b "master" && cd "lwt_eio" && git reset --hard e3679c52cat > Dockerfile <<'END-OF-DOCKERFILE'FROM ocaml/opam:debian-13-ocaml-5.3@sha256:d68d2901c08ff08c488598e952eb1fdf628ab2d548c42615080cd232ee37a8d1# debian-13-5.3_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 b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -uCOPY --chown=1000:1000 lwt_eio.opam ./RUN opam pin add -yn lwt_eio.dev './'RUN echo '(lang dune 3.0)' > './dune-project'ENV DEPS="astring.0.8.5 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.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0"ENV CI="true"ENV OCAMLCI="true"RUN opam update --depexts && opam install --cli=2.5 --depext-only -y lwt_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-BLOCK2026-03-23 09:27.07: Using cache hint "ocaml-multicore/lwt_eio-ocaml/opam:debian-13-ocaml-5.3@sha256:d68d2901c08ff08c488598e952eb1fdf628ab2d548c42615080cd232ee37a8d1-debian-13-5.3_opam-2.5-a8a4f1fe13e34e8395909012b818d3e2"2026-03-23 09:27.07: Using OBuilder spec:((from ocaml/opam:debian-13-ocaml-5.3@sha256:d68d2901c08ff08c488598e952eb1fdf628ab2d548c42615080cd232ee37a8d1)(comment debian-13-5.3_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 b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -u"))(copy (src lwt_eio.opam) (dst ./))(run (network host)(shell "opam pin add -yn lwt_eio.dev './'"))(run (shell "echo '(lang dune 3.0)' > './dune-project'"))(env DEPS "astring.0.8.5 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.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0")(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 lwt_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")))2026-03-23 09:27.07: Waiting for resource in pool OCluster2026-03-23 11:09.44: Waiting for worker…2026-03-23 11:14.36: Got resource from pool OClusterBuilding on bremusa.ocamllabs.ioAll commits already cachedHEAD is now at e3679c5 Merge pull request #30 from talex5/examples(from ocaml/opam:debian-13-ocaml-5.3@sha256:d68d2901c08ff08c488598e952eb1fdf628ab2d548c42615080cd232ee37a8d1)2026-03-23 11:16.12 ---> using "fa087069cd4913e9575aba52692d4f0e549203496289924a2b385444c7b95f42" from cache/: (comment debian-13-5.3_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"))2026-03-23 11:16.12 ---> using "65a89563dad9e49507b822a7e48d4ee1adb3b7e988d00271e2242e8d7b23612b" 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] Initialised2026-03-23 11:16.12 ---> using "efb3e27c48ef6bb8e7692ace1582d326dd8b3cec177d782dbb5496b9e9009d6f" from cache/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))Linux 6.8.0-106-genericThe OCaml toplevel, version 5.3.02.5.02026-03-23 11:16.12 ---> using "c97f89925c634fa7327e31393c7a9cf98fae3fe9dae76ef165dd1735a2e1bd2f" from cache/src: (workdir /src)/src: (run (shell "sudo chown opam /src"))2026-03-23 11:16.12 ---> using "24d739d2e3d927c0f45a4990ccba9d44992ed6aec8944e77d4f6ed43c062e418" from cache/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))(network host)(shell "cd ~/opam-repository && (git cat-file -e b479391466e5245dda12ec6a6de5f4b13b6d603f || git fetch origin master) && git reset -q --hard b479391466e5245dda12ec6a6de5f4b13b6d603f && git log --no-decorate -n1 --oneline && opam update -u"))From https://github.com/ocaml/opam-repository* branch master -> FETCH_HEADffb54b9bdd..63b7ba71be master -> origin/masterb479391466 Merge pull request #29567 from mtelvers/opam-publish-ocaml-version.4.0.4<><> 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)2026-03-23 11:16.12 ---> using "a5087e0bdf342f5fc71fcff0b08b9ba39395a0a695437b1b576352e7e8b8bef7" from cache/src: (copy (src lwt_eio.opam) (dst ./))2026-03-23 11:16.13 ---> saved as "a41b0dcefe6994f4552d00e3189522928cf53d78ac6eb006b51039857d33badb"/src: (run (network host)(shell "opam pin add -yn lwt_eio.dev './'"))[lwt_eio.dev] synchronised (file:///src)lwt_eio is now pinned to file:///src (version dev)2026-03-23 11:16.16 ---> saved as "c0073f357acc4acd03da3eeaaa549389377f38e6c2c389d2c13eeb8344060664"/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))2026-03-23 11:16.16 ---> saved as "5b7a3fe7250175e0b21dc11e6234539303619bed7c6d25a58f41e50067db4532"/src: (env DEPS "astring.0.8.5 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.2.1.0 cppo.1.8.0 csexp.1.5.2 cstruct.6.2.0 domain-local-await.1.0.1 dune.3.22.0 dune-configurator.3.22.0 eio.1.3 eio_linux.1.3 eio_main.1.3 eio_posix.1.3 fmt.0.11.0 hmap.0.8.1 iomux.0.4 logs.0.10.0 lwt.6.1.1 lwt-dllist.1.1.0 mdx.2.5.1 mtime.2.1.0 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-version.4.0.4 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 psq.0.2.1 re.1.14.0 result.1.5 seq.base thread-table.1.0.0 topkg.1.1.1 uring.2.7.0")/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 lwt_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 amd64 Packages [9671 kB]- Get:5 http://deb.debian.org/debian-security trixie-security/main amd64 Packages [114 kB]- Fetched 10.0 MB in 2s (5625 kB/s)- Reading package lists...-<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>[lwt_eio.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).# To update the current shell environment, run: eval $(opam env)2026-03-23 11:16.38 ---> saved as "f607b4a192e404db41b514c7b0d762bea77fd1202d2d4befbd4aebad8ae7e26f"/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 35 packages- install astring 0.8.5- install base-bytes base- install bigstringaf 0.10.0- install camlp-streams 5.0.1- install cmdliner 2.1.0- install cppo 1.8.0- install csexp 1.5.2- install cstruct 6.2.0- install domain-local-await 1.0.1- install dune 3.22.0- install dune-configurator 3.22.0- install eio 1.3- install eio_linux 1.3- install eio_main 1.3- install eio_posix 1.3- install fmt 0.11.0- install hmap 0.8.1- install iomux 0.4- install logs 0.10.0- install lwt 6.1.1- install lwt-dllist 1.1.0- install mdx 2.5.1- install mtime 2.1.0- install ocaml-version 4.0.4- install ocamlbuild 0.16.1- install ocamlfind 1.9.8- install ocplib-endian 1.2- install optint 0.3.0- install psq 0.2.1- install re 1.14.0- install result 1.5- install seq base- install thread-table 1.0.0- install topkg 1.1.1- install uring 2.7.0<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>-> retrieved astring.0.8.5 (cached)-> retrieved bigstringaf.0.10.0 (cached)-> retrieved camlp-streams.5.0.1 (cached)-> retrieved cppo.1.8.0 (cached)-> retrieved cmdliner.2.1.0 (cached)-> retrieved csexp.1.5.2 (cached)-> retrieved cstruct.6.2.0 (cached)-> retrieved domain-local-await.1.0.1 (cached)-> retrieved fmt.0.11.0 (cached)-> retrieved hmap.0.8.1 (cached)-> retrieved iomux.0.4 (cached)-> retrieved logs.0.10.0 (cached)-> retrieved lwt.6.1.1 (cached)-> retrieved lwt-dllist.1.1.0 (cached)-> retrieved mdx.2.5.1 (cached)-> retrieved eio.1.3, eio_linux.1.3, eio_main.1.3, eio_posix.1.3 (cached)-> retrieved mtime.2.1.0 (cached)-> retrieved ocaml-version.4.0.4 (cached)-> retrieved ocamlfind.1.9.8 (cached)-> retrieved ocamlbuild.0.16.1 (cached)-> retrieved ocplib-endian.1.2 (cached)-> retrieved optint.0.3.0 (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 thread-table.1.0.0 (cached)-> retrieved topkg.1.1.1 (cached)-> retrieved uring.2.7.0 (cached)-> retrieved dune.3.22.0, dune-configurator.3.22.0 (cached)-> installed cmdliner.2.1.0-> installed ocamlbuild.0.16.1-> installed ocamlfind.1.9.8-> installed base-bytes.base-> installed topkg.1.1.1-> installed hmap.0.8.1-> installed mtime.2.1.0-> installed fmt.0.11.0-> installed astring.0.8.5-> installed dune.3.22.0-> installed lwt-dllist.1.1.0-> installed csexp.1.5.2-> installed camlp-streams.5.0.1-> installed cppo.1.8.0-> installed cstruct.6.2.0-> installed ocaml-version.4.0.4-> installed optint.0.3.0-> installed psq.0.2.1-> installed re.1.14.0-> installed result.1.5-> installed thread-table.1.0.0-> installed ocplib-endian.1.2-> installed domain-local-await.1.0.1-> installed dune-configurator.3.22.0-> installed bigstringaf.0.10.0-> installed iomux.0.4-> installed uring.2.7.0-> installed eio.1.3-> installed lwt.6.1.1-> installed eio_linux.1.3-> installed eio_posix.1.3-> installed eio_main.1.3-> installed logs.0.10.0-> installed mdx.2.5.1Done.# To update the current shell environment, run: eval $(opam env)2026-03-23 11:18.31 ---> saved as "34dfe86cf8a9d9ebfb168195636333e4def2b3aa87d1cce98b8643195a6184fa"/src: (copy (src .) (dst /src))2026-03-23 11:18.31 ---> saved as "708da2ae1f018ed311d2ba50fefce2dab7af5002961017fcb8c0f7e628741c84"/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))(cd _build/default && /home/opam/.opam/5.3/bin/ocamlc.opt -w @1..3@5..28@30..39@43@46..47@49..57@61..62@67@69-40 -strict-sequence -strict-formats -short-paths -keep-locs -g -bin-annot -bin-annot-occurrences -I lib/.lwt_eio.objs/byte -I /home/opam/.opam/5.3/lib/bigstringaf -I /home/opam/.opam/5.3/lib/bytes -I /home/opam/.opam/5.3/lib/cstruct -I /home/opam/.opam/5.3/lib/domain-local-await -I /home/opam/.opam/5.3/lib/eio -I /home/opam/.opam/5.3/lib/eio/core -I /home/opam/.opam/5.3/lib/eio/runtime_events -I /home/opam/.opam/5.3/lib/eio/unix -I /home/opam/.opam/5.3/lib/eio/utils -I /home/opam/.opam/5.3/lib/fmt -I /home/opam/.opam/5.3/lib/hmap -I /home/opam/.opam/5.3/lib/lwt -I /home/opam/.opam/5.3/lib/lwt-dllist -I /home/opam/.opam/5.3/lib/lwt/unix -I /home/opam/.opam/5.3/lib/mtime -I /home/opam/.opam/5.3/lib/mtime/clock -I /home/opam/.opam/5.3/lib/ocaml/runtime_events -I /home/opam/.opam/5.3/lib/ocaml/threads -I /home/opam/.opam/5.3/lib/ocaml/unix -I /home/opam/.opam/5.3/lib/ocplib-endian -I /home/opam/.opam/5.3/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.3/lib/optint -I /home/opam/.opam/5.3/lib/psq -I /home/opam/.opam/5.3/lib/seq -I /home/opam/.opam/5.3/lib/thread-table -cmi-file lib/.lwt_eio.objs/byte/lwt_eio.cmi -no-alias-deps -opaque -o lib/.lwt_eio.objs/byte/lwt_eio.cmo -c -impl lib/lwt_eio.ml)File "lib/lwt_eio.ml", lines 126-174, characters 29-3:126 | .............................object127 | inherit Lwt_engine.abstract128 |129 | method private cleanup =130 | try Switch.fail sw Exit...171 |172 | method! fork =173 | is_forked := true174 | endError: This object has virtual methods.The following methods are virtual : id(cd _build/default && /home/opam/.opam/5.3/bin/ocamlopt.opt -w @1..3@5..28@30..39@43@46..47@49..57@61..62@67@69-40 -strict-sequence -strict-formats -short-paths -keep-locs -g -I lib/.lwt_eio.objs/byte -I lib/.lwt_eio.objs/native -I /home/opam/.opam/5.3/lib/bigstringaf -I /home/opam/.opam/5.3/lib/bytes -I /home/opam/.opam/5.3/lib/cstruct -I /home/opam/.opam/5.3/lib/domain-local-await -I /home/opam/.opam/5.3/lib/eio -I /home/opam/.opam/5.3/lib/eio/core -I /home/opam/.opam/5.3/lib/eio/runtime_events -I /home/opam/.opam/5.3/lib/eio/unix -I /home/opam/.opam/5.3/lib/eio/utils -I /home/opam/.opam/5.3/lib/fmt -I /home/opam/.opam/5.3/lib/hmap -I /home/opam/.opam/5.3/lib/lwt -I /home/opam/.opam/5.3/lib/lwt-dllist -I /home/opam/.opam/5.3/lib/lwt/unix -I /home/opam/.opam/5.3/lib/mtime -I /home/opam/.opam/5.3/lib/mtime/clock -I /home/opam/.opam/5.3/lib/ocaml/runtime_events -I /home/opam/.opam/5.3/lib/ocaml/threads -I /home/opam/.opam/5.3/lib/ocaml/unix -I /home/opam/.opam/5.3/lib/ocplib-endian -I /home/opam/.opam/5.3/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.3/lib/optint -I /home/opam/.opam/5.3/lib/psq -I /home/opam/.opam/5.3/lib/seq -I /home/opam/.opam/5.3/lib/thread-table -cmi-file lib/.lwt_eio.objs/byte/lwt_eio.cmi -no-alias-deps -opaque -o lib/.lwt_eio.objs/native/lwt_eio.cmx -c -impl lib/lwt_eio.ml)File "lib/lwt_eio.ml", lines 126-174, characters 29-3:126 | .............................object127 | inherit Lwt_engine.abstract128 |129 | method private cleanup =130 | try Switch.fail sw Exit...171 |172 | method! fork =173 | is_forked := true174 | endError: This object has virtual methods.The following methods are virtual : id"/usr/bin/env" "bash" "-c" "opam exec -- dune build @install @check @runtest && rm -rf _build" failed with exit status 12026-03-23 11:18.39: Job failed: Failed: Build failed