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:alpine-3.22-5.4_opam-2.5)Base: ocaml/opam:alpine-3.22-ocaml-5.4@sha256:7d7dd1f15b5b094a8c6ec589b462e81fe5f982c5d6f2ac4af2e5e3dcdc1525e5Opam 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:alpine-3.22-ocaml-5.4@sha256:7d7dd1f15b5b094a8c6ec589b462e81fe5f982c5d6f2ac4af2e5e3dcdc1525e5# alpine-3.22-5.4_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.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 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:alpine-3.22-ocaml-5.4@sha256:7d7dd1f15b5b094a8c6ec589b462e81fe5f982c5d6f2ac4af2e5e3dcdc1525e5-alpine-3.22-5.4_opam-2.5-e8c1b20f09074fcd962a3f10a4b561f6"2026-03-23 09:27.07: Using OBuilder spec:((from ocaml/opam:alpine-3.22-ocaml-5.4@sha256:7d7dd1f15b5b094a8c6ec589b462e81fe5f982c5d6f2ac4af2e5e3dcdc1525e5)(comment alpine-3.22-5.4_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.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 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 11:09.50: Waiting for worker…2026-03-23 11:14.37: Got resource from pool OClusterBuilding on odawa.caelum.ci.devAll commits already cachedHEAD is now at e3679c5 Merge pull request #30 from talex5/examples(from ocaml/opam:alpine-3.22-ocaml-5.4@sha256:7d7dd1f15b5b094a8c6ec589b462e81fe5f982c5d6f2ac4af2e5e3dcdc1525e5)2026-03-23 11:15.08 ---> saved as "8e7368a35b514e2f693b7ef97549c85525e506baecfd9cb71dfa7c1285b9bf9e"/: (comment alpine-3.22-5.4_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 11:15.08 ---> saved as "5de1607ed24a4d9a94f038b30a5d26051019ad9d567bd9b920207c8a8790958e"/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 11:15.33 ---> saved as "9a9c4e5cee84ea1f4dd03ef20c73db2f8677135dce421b26bfc6a84a6e4cec86"/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))Linux 6.8.0-106-genericThe OCaml toplevel, version 5.4.02.5.02026-03-23 11:15.33 ---> saved as "667074f5be2334a92415ceab74ec15bb59d47bdf0e2beb825eaa389555f40c78"/src: (workdir /src)/src: (run (shell "sudo chown opam /src"))2026-03-23 11:15.33 ---> saved as "33c7b91e3a3fd17dd0b670dfb64c2fe390ea331270d4439429317512d6a40df2"/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_HEADa6b2f19780..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 possibleHowever, 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 11:15.54 ---> saved as "965cc5c946ee5fc6149e8bdf9960047992e5d2c0839ef49d58ffc2a1f4f482a1"/src: (copy (src lwt_eio.opam) (dst ./))2026-03-23 11:15.55 ---> saved as "a7e57e5e5a005de60aa223641a557b2a493b0a72974a43758de0e68a264800b3"/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 11:15.57 ---> saved as "0bf1183536730a5a8f2e37c52946f924b6201c60677c9013acfc598e80769224"/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))2026-03-23 11:15.57 ---> saved as "cd3542b3a6efa46075c74e04071184df2796d833e0880062d282391d9d3182bb"/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.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 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 "apk" "update"- fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/main/x86_64/APKINDEX.tar.gz- fetch https://dl-cdn.alpinelinux.org/alpine/v3.22/community/x86_64/APKINDEX.tar.gz- fetch https://dl-cdn.alpinelinux.org/alpine/edge/main/x86_64/APKINDEX.tar.gz- fetch https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz- fetch https://dl-cdn.alpinelinux.org/alpine/edge/testing/x86_64/APKINDEX.tar.gz- v3.22.3-75-ged08c5a4e85 [https://dl-cdn.alpinelinux.org/alpine/v3.22/main]- v3.22.3-76-g2f42617de4f [https://dl-cdn.alpinelinux.org/alpine/v3.22/community]- v20260127-3555-g4dee12227e7 [https://dl-cdn.alpinelinux.org/alpine/edge/main]- v20260127-3553-gb2762b20b21 [https://dl-cdn.alpinelinux.org/alpine/edge/community]- v20260127-3545-g55495afc786 [https://dl-cdn.alpinelinux.org/alpine/edge/testing]- OK: 61069 distinct packages available<><> 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 5.4.0).[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml is already installed (current version is 5.4.0).[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 system packages will first need to be installed:linux-headers<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>+ /usr/bin/sudo "apk" "add" "linux-headers"- (1/1) Installing linux-headers (6.14.2-r0)- OK: 313 MiB in 104 packages# To update the current shell environment, run: eval $(opam env)2026-03-23 11:16.07 ---> saved as "0ec46c486423c361252678cd0214032d4006eaf27a3516013f3e7ae1aa42b988"/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 5.4.0).[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.0).[NOTE] Package ocaml is already installed (current version is 5.4.0).[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 eio.1.3, eio_linux.1.3, eio_main.1.3, eio_posix.1.3 (cached)-> retrieved lwt.6.1.1 (cached)-> retrieved lwt-dllist.1.1.0 (cached)-> retrieved mtime.2.1.0 (cached)-> retrieved ocaml-version.4.0.4 (cached)-> retrieved mdx.2.5.1 (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 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 dune.3.22.0, dune-configurator.3.22.0 (cached)-> retrieved uring.2.7.0 (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 fmt.0.11.0-> installed mtime.2.1.0-> installed astring.0.8.5-> installed dune.3.22.0-> 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 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 eio.1.3-> installed lwt.6.1.1-> installed uring.2.7.0-> installed eio_posix.1.3-> installed eio_linux.1.3-> installed logs.0.10.0-> installed eio_main.1.3-> installed mdx.2.5.1Done.# To update the current shell environment, run: eval $(opam env)2026-03-23 11:16.49 ---> saved as "25f954c63ec6bcbc8a413d1f46e5bf7411e85c9d991a4653cb93cccaa1c96966"/src: (copy (src .) (dst /src))2026-03-23 11:16.49 ---> saved as "7dbae9cecf207120d0722dc0ee3a03df0e45ab1aff34ecf4c64501344e7c4c0e"/src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build"))(cd _build/default && /home/opam/.opam/5.4/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/5.4/lib/bigstringaf -I /home/opam/.opam/5.4/lib/bytes -I /home/opam/.opam/5.4/lib/cstruct -I /home/opam/.opam/5.4/lib/domain-local-await -I /home/opam/.opam/5.4/lib/eio -I /home/opam/.opam/5.4/lib/eio/core -I /home/opam/.opam/5.4/lib/eio/runtime_events -I /home/opam/.opam/5.4/lib/eio/unix -I /home/opam/.opam/5.4/lib/eio/utils -I /home/opam/.opam/5.4/lib/fmt -I /home/opam/.opam/5.4/lib/hmap -I /home/opam/.opam/5.4/lib/lwt -I /home/opam/.opam/5.4/lib/lwt-dllist -I /home/opam/.opam/5.4/lib/lwt/unix -I /home/opam/.opam/5.4/lib/mtime -I /home/opam/.opam/5.4/lib/mtime/clock -I /home/opam/.opam/5.4/lib/ocaml/runtime_events -I /home/opam/.opam/5.4/lib/ocaml/threads -I /home/opam/.opam/5.4/lib/ocaml/unix -I /home/opam/.opam/5.4/lib/ocplib-endian -I /home/opam/.opam/5.4/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.4/lib/optint -I /home/opam/.opam/5.4/lib/psq -I /home/opam/.opam/5.4/lib/seq -I /home/opam/.opam/5.4/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/5.4/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/5.4/lib/bigstringaf -I /home/opam/.opam/5.4/lib/bytes -I /home/opam/.opam/5.4/lib/cstruct -I /home/opam/.opam/5.4/lib/domain-local-await -I /home/opam/.opam/5.4/lib/eio -I /home/opam/.opam/5.4/lib/eio/core -I /home/opam/.opam/5.4/lib/eio/runtime_events -I /home/opam/.opam/5.4/lib/eio/unix -I /home/opam/.opam/5.4/lib/eio/utils -I /home/opam/.opam/5.4/lib/fmt -I /home/opam/.opam/5.4/lib/hmap -I /home/opam/.opam/5.4/lib/lwt -I /home/opam/.opam/5.4/lib/lwt-dllist -I /home/opam/.opam/5.4/lib/lwt/unix -I /home/opam/.opam/5.4/lib/mtime -I /home/opam/.opam/5.4/lib/mtime/clock -I /home/opam/.opam/5.4/lib/ocaml/runtime_events -I /home/opam/.opam/5.4/lib/ocaml/threads -I /home/opam/.opam/5.4/lib/ocaml/unix -I /home/opam/.opam/5.4/lib/ocplib-endian -I /home/opam/.opam/5.4/lib/ocplib-endian/bigstring -I /home/opam/.opam/5.4/lib/optint -I /home/opam/.opam/5.4/lib/psq -I /home/opam/.opam/5.4/lib/seq -I /home/opam/.opam/5.4/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 11:16.53: Job failed: Failed: Build failed