2026-01-16 13:58.35: New job: test ocsigen/lwt https://github.com/ocsigen/lwt.git#refs/heads/fix-datarace-1026 (141d187d1113a0348399c4ced37d9dcc82b7f11d) (linux-x86_64:fedora-43-5.4_opam-2.5) Base: ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7 Opam project build To reproduce locally: git clone --recursive "https://github.com/ocsigen/lwt.git" -b "fix-datarace-1026" && cd "lwt" && git reset --hard 141d187d cat > Dockerfile <<'END-OF-DOCKERFILE' FROM ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7 # fedora-43-5.4_opam-2.5 USER 1000:1000 ENV CLICOLOR_FORCE="1" ENV OPAMCOLOR="always" WORKDIR /src RUN sudo dnf install -y findutils 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 873cb18c37b308713d11ad3894c4bb78d73fb3e7 || git fetch origin master) && git reset -q --hard 873cb18c37b308713d11ad3894c4bb78d73fb3e7 && git log --no-decorate -n1 --oneline && opam update -u COPY --chown=1000:1000 lwt_runtime_events.opam lwt_retry.opam lwt_react.opam lwt_ppx__ppx_let_tests.opam lwt_ppx.opam lwt_direct.opam lwt.opam ./ RUN opam pin add -yn lwt_runtime_events.dev './' && \ opam pin add -yn lwt_retry.dev './' && \ opam pin add -yn lwt_react.dev './' && \ opam pin add -yn lwt_ppx__ppx_let_tests.dev './' && \ opam pin add -yn lwt_ppx.dev './' && \ opam pin add -yn lwt_direct.dev './' && \ opam pin add -yn lwt.dev './' RUN echo '(lang dune 3.0)' > './dune-project' ENV DEPS="base.v0.17.3 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base cppo.1.8.0 csexp.1.5.2 dune.3.21.0 dune-configurator.3.21.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 ppx_derivers.1.2.1 ppx_here.v0.17.0 ppx_let.v0.17.1 ppxlib.0.37.0 react.1.2.2 sexplib0.v0.17.0 stdlib-shims.0.3.0 topkg.1.1.1" ENV CI="true" ENV OCAMLCI="true" RUN opam update --depexts && opam install --cli=2.5 --depext-only -y lwt_runtime_events.dev lwt_retry.dev lwt_react.dev lwt_ppx__ppx_let_tests.dev lwt_ppx.dev lwt_direct.dev lwt.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 2026-01-16 13:58.35: Using cache hint "ocsigen/lwt-ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7-fedora-43-5.4_opam-2.5-75ab778214f47ae1c2af4a869bf7c608" 2026-01-16 13:58.35: Using OBuilder spec: ((from ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7) (comment fedora-43-5.4_opam-2.5) (user (uid 1000) (gid 1000)) (env CLICOLOR_FORCE 1) (env OPAMCOLOR always) (workdir /src) (run (network host) (shell "sudo dnf install -y findutils")) (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 873cb18c37b308713d11ad3894c4bb78d73fb3e7 || git fetch origin master) && git reset -q --hard 873cb18c37b308713d11ad3894c4bb78d73fb3e7 && git log --no-decorate -n1 --oneline && opam update -u")) (copy (src lwt_runtime_events.opam lwt_retry.opam lwt_react.opam lwt_ppx__ppx_let_tests.opam lwt_ppx.opam lwt_direct.opam lwt.opam) (dst ./)) (run (network host) (shell "opam pin add -yn lwt_runtime_events.dev './' && \ \nopam pin add -yn lwt_retry.dev './' && \ \nopam pin add -yn lwt_react.dev './' && \ \nopam pin add -yn lwt_ppx__ppx_let_tests.dev './' && \ \nopam pin add -yn lwt_ppx.dev './' && \ \nopam pin add -yn lwt_direct.dev './' && \ \nopam pin add -yn lwt.dev './'")) (run (network host) (shell "echo '(lang dune 3.0)' > './dune-project'")) (env DEPS "base.v0.17.3 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base cppo.1.8.0 csexp.1.5.2 dune.3.21.0 dune-configurator.3.21.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 ppx_derivers.1.2.1 ppx_here.v0.17.0 ppx_let.v0.17.1 ppxlib.0.37.0 react.1.2.2 sexplib0.v0.17.0 stdlib-shims.0.3.0 topkg.1.1.1") (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_runtime_events.dev lwt_retry.dev lwt_react.dev lwt_ppx__ppx_let_tests.dev lwt_ppx.dev lwt_direct.dev lwt.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")) ) 2026-01-16 13:58.35: Waiting for resource in pool OCluster 2026-01-16 18:01.03: Waiting for worker… 2026-01-16 18:04.42: Got resource from pool OCluster Building on laodoke.caelum.ci.dev All commits already cached HEAD is now at 141d187d1 lwt_unix_stubs.c: fix races reported by TSan (from ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7) Unable to find image 'ocaml/opam:fedora-43-ocaml-5.4@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7' locally docker.io/ocaml/opam@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7: Pulling from ocaml/opam 1216d224fefc: Already exists d2b80d0f9692: Already exists b44754d8bf82: Already exists 36abc5888bbf: Already exists 13ceeda275e3: Already exists 9d0a0e279caf: Already exists 40e2d63e6bc8: Already exists 75b3ac574ea6: Already exists 1049f777ea82: Already exists 03fc9df51c6a: Already exists b047e90b13a5: Already exists 9e9b975180f0: Already exists 67d0d0d5c8c1: Already exists 89a5d6bde7a7: Already exists 1d93c1211989: Already exists 29eae7cc87b0: Already exists 29eae7cc87b0: Already exists cbc0891b6ad5: Already exists 1dcdb5dba4d6: Already exists cbbbe6830481: Already exists 21e1ea572da2: Already exists 4f4fb700ef54: Already exists 98b69470db28: Already exists 2dcdfd57803f: Already exists 379ef38822e9: Already exists 3bc4f9dcff1f: Already exists d9698ccc8ea7: Already exists 5ed663178eca: Already exists c8305c642087: Already exists 8f6d93fd556f: Already exists 921519ed1807: Already exists c60d13ca69bb: Already exists 2aac9c9633a8: Already exists c0e95d961175: Already exists 27ce8579a8e4: Already exists fe5862feaa51: Already exists e29132ca7758: Already exists 7f1e364d449b: Already exists a8bd8d8144bc: Already exists 571a3efac70d: Already exists a83a90a79bde: Pulling fs layer 965ec293f8c1: Pulling fs layer 98102c35b6c5: Pulling fs layer be27aa16171d: Pulling fs layer c900362c76d3: Pulling fs layer be27aa16171d: Waiting c900362c76d3: Waiting 98102c35b6c5: Verifying Checksum 98102c35b6c5: Download complete be27aa16171d: Verifying Checksum be27aa16171d: Download complete a83a90a79bde: Verifying Checksum a83a90a79bde: Download complete a83a90a79bde: Pull complete c900362c76d3: Download complete 965ec293f8c1: Verifying Checksum 965ec293f8c1: Download complete 965ec293f8c1: Pull complete 98102c35b6c5: Pull complete be27aa16171d: Pull complete c900362c76d3: Pull complete Digest: sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7 Status: Downloaded newer image for ocaml/opam@sha256:e63cb54f263f69a5487a22bff4673effded4c57d56bd27fd67e3cc2615aab9b7 2026-01-16 18:04.42 ---> using "4e2b8591845136281b2629afb7934c15f1ae534ce6c700ee8841e11b607a33a7" from cache /: (comment fedora-43-5.4_opam-2.5) /: (user (uid 1000) (gid 1000)) /: (env CLICOLOR_FORCE 1) /: (env OPAMCOLOR always) /: (workdir /src) /src: (run (network host) (shell "sudo dnf install -y findutils")) Updating and loading repositories: Fedora 43 - x86_64 - Updates 100% | 76.2 KiB/s | 20.4 KiB | 00m00s Repositories loaded. Nothing to do. Package "findutils-1:4.10.0-6.fc43.x86_64" is already installed. 2026-01-16 18:04.42 ---> using "837c07188bf50ea546afbccb4d2f64bc0404968bc0937813826ca26b88c6ea71" from cache /src: (run (shell "sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam")) 2026-01-16 18:04.42 ---> using "a0e1ae1c42dd01ffe431135132f32b5d6f97bc76e97c00f10122bcde345422b4" 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 Format upgrade done. <><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><> [default] Initialised 2026-01-16 18:04.42 ---> using "61a7774f29dc5820513e99ec972f57df997429bf3f81ba129e961d9c42ee9cf0" from cache /src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version")) Linux 6.8.0-90-generic The OCaml toplevel, version 5.4.0 2.5.0 2026-01-16 18:04.42 ---> using "63917ca5af84f6109637526de6c22761387273cdcaa1b1d885dc1d45fbb1fa8b" from cache /src: (workdir /src) /src: (run (shell "sudo chown opam /src")) 2026-01-16 18:04.42 ---> using "26df678581fbe1125840d6b3260cbe14d9d438bec832027001047372311489df" from cache /src: (run (cache (opam-archives (target /home/opam/.opam/download-cache))) (network host) (shell "cd ~/opam-repository && (git cat-file -e 873cb18c37b308713d11ad3894c4bb78d73fb3e7 || git fetch origin master) && git reset -q --hard 873cb18c37b308713d11ad3894c4bb78d73fb3e7 && git log --no-decorate -n1 --oneline && opam update -u")) From https://github.com/ocaml/opam-repository * branch master -> FETCH_HEAD a6b2f19780..92679ed614 master -> origin/master 873cb18c37 Merge pull request #29216 from shonfeder/release-dune-3.21.0 <><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><> [default] synchronised from git+file:///home/opam/opam-repository Already up-to-date. Nothing to do. # To update the current shell environment, run: eval $(opam env) 2026-01-16 18:04.42 ---> using "49b37028defa538922886761feef9a46e2c85e832a643652757c45819caa9f86" from cache /src: (copy (src lwt_runtime_events.opam lwt_retry.opam lwt_react.opam lwt_ppx__ppx_let_tests.opam lwt_ppx.opam lwt_direct.opam lwt.opam) (dst ./)) 2026-01-16 18:04.43 ---> saved as "935d9e2d279c0db97293b67962f9a1daa0dd00194609ffdd7eb1fbae8745d04d" /src: (run (network host) (shell "opam pin add -yn lwt_runtime_events.dev './' && \ \nopam pin add -yn lwt_retry.dev './' && \ \nopam pin add -yn lwt_react.dev './' && \ \nopam pin add -yn lwt_ppx__ppx_let_tests.dev './' && \ \nopam pin add -yn lwt_ppx.dev './' && \ \nopam pin add -yn lwt_direct.dev './' && \ \nopam pin add -yn lwt.dev './'")) [lwt_runtime_events.dev] synchronised (file:///src) lwt_runtime_events is now pinned to file:///src (version dev) [lwt_retry.dev] synchronised (file:///src) lwt_retry is now pinned to file:///src (version dev) [lwt_react.dev] synchronised (file:///src) lwt_react is now pinned to file:///src (version dev) [NOTE] Package lwt_ppx__ppx_let_tests does not exist in opam repositories registered in the current switch. [WARNING] Failed checks on lwt_ppx__ppx_let_tests package definition from source at file:///src: warning 62: License doesn't adhere to the SPDX standard, see https://spdx.org/licenses/ : "NOTFORRELEASE" [lwt_ppx__ppx_let_tests.dev] synchronised (file:///src) lwt_ppx__ppx_let_tests is now pinned to file:///src (version dev) [lwt_ppx.dev] synchronised (file:///src) lwt_ppx is now pinned to file:///src (version dev) [lwt_direct.dev] synchronised (file:///src) lwt_direct is now pinned to file:///src (version dev) [lwt.dev] synchronised (file:///src) lwt is now pinned to file:///src (version dev) 2026-01-16 18:04.53 ---> saved as "5399f22862e1ca4607d0ab5028b72566e315c3dcf715cfda63b43062d3326a7a" /src: (run (network host) (shell "echo '(lang dune 3.0)' > './dune-project'")) 2026-01-16 18:04.53 ---> saved as "a2bcec8219e2543d823089e65fffb90136fd72496efa9f3cc5bb0205e891bea2" /src: (env DEPS "base.v0.17.3 base-bigarray.base base-bytes.base base-domains.base base-effects.base base-nnp.base base-threads.base base-unix.base cppo.1.8.0 csexp.1.5.2 dune.3.21.0 dune-configurator.3.21.0 ocaml.5.4.0 ocaml-base-compiler.5.4.0 ocaml-compiler.5.4.0 ocaml-compiler-libs.v0.17.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml_intrinsics_kernel.v0.17.1 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 ppx_derivers.1.2.1 ppx_here.v0.17.0 ppx_let.v0.17.1 ppxlib.0.37.0 react.1.2.2 sexplib0.v0.17.0 stdlib-shims.0.3.0 topkg.1.1.1") /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_runtime_events.dev lwt_retry.dev lwt_react.dev lwt_ppx__ppx_let_tests.dev lwt_ppx.dev lwt_direct.dev lwt.dev $DEPS")) + /usr/sbin/sudo "yum" "makecache" - Updating and loading repositories: - Repositories loaded. - Metadata cache created. <><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><> [lwt.dev] synchronised (file:///src) [lwt_direct.dev] synchronised (file:///src) [lwt_ppx.dev] synchronised (file:///src) [lwt_ppx__ppx_let_tests.dev] synchronised (file:///src) [lwt_react.dev] synchronised (file:///src) [lwt_retry.dev] synchronised (file:///src) [lwt_runtime_events.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). # To update the current shell environment, run: eval $(opam env) 2026-01-16 18:05.12 ---> saved as "b631c82291c49e43f5e437059d253b2e9895b09c83f9787c8bbcef98b19f1646" /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 19 packages - install base v0.17.3 - install base-bytes base - install cppo 1.8.0 - install csexp 1.5.2 - install dune 3.21.0 - install dune-configurator 3.21.0 - install ocaml-compiler-libs v0.17.0 - install ocaml_intrinsics_kernel v0.17.1 - install ocamlbuild 0.16.1 - install ocamlfind 1.9.8 - install ocplib-endian 1.2 - install ppx_derivers 1.2.1 - install ppx_here v0.17.0 - install ppx_let v0.17.1 - install ppxlib 0.37.0 - install react 1.2.2 - install sexplib0 v0.17.0 - install stdlib-shims 0.3.0 - install topkg 1.1.1 <><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><> -> retrieved base.v0.17.3 (cached) -> retrieved cppo.1.8.0 (cached) -> retrieved csexp.1.5.2 (cached) -> retrieved ocaml-compiler-libs.v0.17.0 (cached) -> retrieved ocaml_intrinsics_kernel.v0.17.1 (cached) -> retrieved ocamlbuild.0.16.1 (cached) -> retrieved ocamlfind.1.9.8 (cached) -> retrieved ocplib-endian.1.2 (cached) -> retrieved ppx_derivers.1.2.1 (cached) -> retrieved ppx_here.v0.17.0 (cached) -> retrieved ppx_let.v0.17.1 (cached) -> retrieved react.1.2.2 (cached) -> retrieved sexplib0.v0.17.0 (cached) -> retrieved stdlib-shims.0.3.0 (cached) -> retrieved topkg.1.1.1 (cached) -> retrieved ppxlib.0.37.0 (cached) -> retrieved dune.3.21.0, dune-configurator.3.21.0 (cached) -> installed ocamlbuild.0.16.1 -> installed ocamlfind.1.9.8 -> installed base-bytes.base -> installed topkg.1.1.1 -> installed react.1.2.2 -> installed dune.3.21.0 -> installed ppx_derivers.1.2.1 -> installed stdlib-shims.0.3.0 -> installed csexp.1.5.2 -> installed cppo.1.8.0 -> installed ocaml-compiler-libs.v0.17.0 -> installed ocaml_intrinsics_kernel.v0.17.1 -> installed sexplib0.v0.17.0 -> installed ocplib-endian.1.2 -> installed dune-configurator.3.21.0 -> installed base.v0.17.3 -> installed ppxlib.0.37.0 -> installed ppx_here.v0.17.0 -> installed ppx_let.v0.17.1 Done. # To update the current shell environment, run: eval $(opam env) 2026-01-16 18:08.02 ---> saved as "695f9d1d90496889b4119e6eb85926637c10cbedacf94cbf6057b9eee91d2240" /src: (copy (src .) (dst /src)) 2026-01-16 18:08.03 ---> saved as "2ce20efa666325d04f84a0e520013d89385a61789e54c5442e1e43d90473a55c" /src: (run (shell "opam exec -- dune build @install @check @runtest && rm -rf _build")) (cd _build/default/test/retry && ./main.exe) Testing library 'retry'... .............. Ok. 14 tests ran, 0 tests skipped in 0.03 seconds (cd _build/default/test/direct && ./main.exe) Testing library 'lwt_direct'... ............. Ok. 13 tests ran, 0 tests skipped in 0.00 seconds (cd _build/default/test/core && ./main.exe) Testing library 'core'... ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................SSSSSSSSSSSSSSSSSSSSSSS.................................................................................................................................................. Ok. 705 tests ran, 23 tests skipped in 0.54 seconds (cd _build/default/test/react && ./main.exe) Testing library 'react'... ........... Ok. 11 tests ran, 0 tests skipped in 4.50 seconds (cd _build/default/test/ppx && ./main.exe) Testing library 'ppx'... ................ Ok. 16 tests ran, 0 tests skipped in 1.21 seconds (cd _build/default/test/unix && ./main.exe) Testing library 'unix'... .................................SSSSS..................................S.....................................................................................................SSS.......................................................... Ok. 226 tests ran, 9 tests skipped in 6.50 seconds 2026-01-16 18:08.26 ---> saved as "ddeb35829ded880d1362c82e9691d214eba3be1fbe4fc152a17b1aa138493cf0" Job succeeded 2026-01-16 18:08.26: Job succeeded