debian-13-5.4_ppc64_opam-2.5

2026-06-09 10:09.17: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/851/head (a1f7b6848795abf641d8b1843bb7a1e56f869a03) (linux-ppc64:debian-13-5.4_ppc64_opam-2.5)
Base: ocaml/opam:debian-13-ocaml-5.4@sha256:e72a31a6247b03c00cdaffe88301eab53afb80cfe9d5b842204827887236bd61
Opam project build

To reproduce locally:

git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/851/head" && git reset --hard a1f7b684
cat > Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-5.4@sha256:e72a31a6247b03c00cdaffe88301eab53afb80cfe9d5b842204827887236bd61
# debian-13-5.4_ppc64_opam-2.5
USER 1000:1000
ENV CLICOLOR_FORCE="1"
ENV OPAMCOLOR="always"
WORKDIR /src
RUN sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam
RUN cd ~/opam-repository && (git cat-file -e c98b21e24c088665ccae4c3b53eadadd3b755b15 || git fetch origin master) && git reset -q --hard c98b21e24c088665ccae4c3b53eadadd3b755b15 && git log --no-decorate -n1 --oneline
RUN opam init --reinit -ni
RUN uname -rs && opam exec -- ocaml -version && opam --version
WORKDIR /src
RUN sudo chown opam /src
RUN opam update -u
COPY --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.2.1.1 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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 lintcstubs-arity.0.5.2 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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.2.14.0 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 $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

2026-06-09 10:09.17: Using cache hint "ocaml-multicore/eio-ocaml/opam:debian-13-ocaml-5.4@sha256:e72a31a6247b03c00cdaffe88301eab53afb80cfe9d5b842204827887236bd61-debian-13-5.4_ppc64_opam-2.5-12c456a1f67161cdda644e9d789b7618"
2026-06-09 10:09.17: Using OBuilder spec:
((from ocaml/opam:debian-13-ocaml-5.4@sha256:e72a31a6247b03c00cdaffe88301eab53afb80cfe9d5b842204827887236bd61)
 (comment debian-13-5.4_ppc64_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 (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "cd ~/opam-repository && (git cat-file -e c98b21e24c088665ccae4c3b53eadadd3b755b15 || git fetch origin master) && git reset -q --hard c98b21e24c088665ccae4c3b53eadadd3b755b15 && git log --no-decorate -n1 --oneline"))
 (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 "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-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.1 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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 lintcstubs-arity.0.5.2 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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.2.14.0 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"))
)

2026-06-09 10:09.17: Waiting for resource in pool OCluster
2026-06-09 10:09.17: Waiting for worker…
2026-06-09 10:09.17: Got resource from pool OCluster
Building on scyleia.caelum.ci.dev
HEAD is now at bd0ad09 Merge pull request #849 from talex5/simplify-rw
HEAD is now at a1f7b68 eio_linux: remove unused code

(from ocaml/opam:debian-13-ocaml-5.4@sha256:e72a31a6247b03c00cdaffe88301eab53afb80cfe9d5b842204827887236bd61)
2026-06-09 10:09.18 ---> using "091802f641e43489888e795f557a1cae54c49b7ec9e137997252e3e6eba01965" from cache

/: (comment debian-13-5.4_ppc64_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"))
2026-06-09 10:09.18 ---> using "0ee279940b26dd10f348f43f792f93feb82f2fb33f7e66c55bc5a62156e66b97" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "cd ~/opam-repository && (git cat-file -e c98b21e24c088665ccae4c3b53eadadd3b755b15 || git fetch origin master) && git reset -q --hard c98b21e24c088665ccae4c3b53eadadd3b755b15 && git log --no-decorate -n1 --oneline"))
From https://github.com/ocaml/opam-repository
 * branch                  master     -> FETCH_HEAD
   fc08333d1b..8e7cc3fd7b  master     -> origin/master
c98b21e24c Merge pull request #29993 from shonfeder/conditional-mdx-tests
2026-06-09 10:09.18 ---> using "13a9d443c32297c749086da3f5672da2fe59f209abff55655ff6d218f85deead" 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 2.1 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [Y/n] y
[NOTE] The 'jobs' option was reset, its value was 1 and its new value will vary according to the current number of cores on your machine. You can restore the fixed value using:
           opam option jobs=1 --global
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from git+file:///home/opam/opam-repository
2026-06-09 10:09.18 ---> using "6e0535fbec659006f6fde21902fd310b45455212e94648c7bbba909542b284b4" from cache

/src: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
Linux 7.0.0-22-generic
The OCaml toplevel, version 5.4.1
2.5.1
2026-06-09 10:09.18 ---> using "0c437a3e83fce9fac8d4ba7cd6f3282ad65071c083f20212e634cab81edfcf47" from cache

/src: (workdir /src)

/src: (run (shell "sudo chown opam /src"))
2026-06-09 10:09.18 ---> using "23e278cdaa115f8e5a4757ff18b9c97db8e73dcd74c0cf6c5823342b289c674f" from cache

/src: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
           (network host)
           (shell "opam update -u"))

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] no changes from git+file:///home/opam/opam-repository

Everything as up-to-date as possible

The following packages are not being upgraded because the new versions conflict with other installed packages:
  - ocaml.5.5.0
  - ocaml-compiler.5.4.1+lrgrep
    -- ocaml-base-compiler.5.4.1 is installed and requires ocaml-compiler = 5.4.1
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)
2026-06-09 10:09.18 ---> using "d3212f1f1390faeb8423e07420ce14fa95036affcb6f6616cdcc8a1c311b1744" from cache

/src: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
            (dst ./))
2026-06-09 10:09.18 ---> using "4f4088437ed469921da7644c5ef4964d3147a87a96968ba06e20fcdd235ecdbf" 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)
2026-06-09 10:09.18 ---> using "e23a53fd2bcb4df693cd5ba939cb522738f381bf7d428d57cdb481c80e3a9dee" from cache

/src: (run (shell "echo '(lang dune 3.0)' > './dune-project'"))
2026-06-09 10:09.18 ---> using "582a85af4d586a2649441ee0ca6186c7891d048916c7f05bf7133f6efe472081" 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-effects.base base-nnp.base base-threads.base base-unix.base bigstringaf.0.10.0 camlp-streams.5.0.1 cmdliner.2.1.1 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.3.23.1 dune-configurator.3.23.1 either.1.0.0 fmt.0.11.0 hmap.0.8.1 iomux.0.4 kcas.0.7.0 lintcstubs-arity.0.5.2 logs.0.10.0 lwt-dllist.1.1.0 mdx.2.5.2 mtime.2.1.0 multicore-magic.2.3.2 ocaml.5.4.1 ocaml-base-compiler.5.4.1 ocaml-compiler.5.4.1 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.4.1.1 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.2.14.0 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"
- 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 ppc64el Packages [9509 kB]
- Get:5 http://deb.debian.org/debian-security trixie-security/main ppc64el Packages [201 kB]
- Fetched 9940 kB in 2s (4916 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 5.4.1).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml is already installed (current version is 5.4.1).
[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-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)
2026-06-09 10:09.18 ---> using "85592b35fca7b01b1fb93e43763b26997e4cfa4db33f519dbd0d8551500e128f" from cache

/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 5.4.1).
[NOTE] Package ocaml-base-compiler is already installed (current version is 5.4.1).
[NOTE] Package ocaml is already installed (current version is 5.4.1).
[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-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 46 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             2.1.1
  - 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                 3.23.1
  - install dune-configurator    3.23.1
  - 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 lintcstubs-arity     0.5.2
  - 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        4.1.1
  - 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                2.14.0
  - install uutf                 1.0.4
  - install yojson               3.0.0

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved alcotest.1.9.1  (cached)
-> retrieved astring.0.8.5  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved camlp-streams.5.0.1  (cached)
-> retrieved backoff.0.1.1  (https://opam.ocaml.org/cache)
-> installed conf-bash.1
-> retrieved cmdliner.2.1.1  (cached)
-> retrieved afl-persistent.1.4  (https://opam.ocaml.org/cache)
-> retrieved cppo.1.8.0  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved cstruct.6.2.0  (cached)
-> retrieved domain-local-await.1.0.1  (cached)
-> retrieved crowbar.0.2.2  (https://opam.ocaml.org/cache)
-> retrieved domain-local-timeout.1.0.1  (https://opam.ocaml.org/cache)
-> retrieved containers.3.18  (https://opam.ocaml.org/cache)
-> retrieved dscheck.0.5.0  (https://opam.ocaml.org/cache)
-> retrieved fmt.0.11.0  (cached)
-> retrieved hmap.0.8.1  (cached)
-> retrieved either.1.0.0  (https://opam.ocaml.org/cache)
-> retrieved iomux.0.4  (cached)
-> retrieved lintcstubs-arity.0.5.2  (https://opam.ocaml.org/cache)
-> retrieved kcas.0.7.0  (https://opam.ocaml.org/cache)
-> retrieved logs.0.10.0  (cached)
-> retrieved lwt-dllist.1.1.0  (cached)
-> retrieved mtime.2.1.0  (cached)
-> retrieved mdx.2.5.2  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml-version.4.1.1  (cached)
-> retrieved multicore-magic.2.3.2  (https://opam.ocaml.org/cache)
-> retrieved ocamlbuild.0.16.1  (cached)
-> retrieved ocamlfind.1.9.8  (cached)
-> retrieved optint.0.3.0  (cached)
-> retrieved psq.0.2.1  (cached)
-> retrieved re.1.14.0  (cached)
-> retrieved result.1.5  (cached)
-> retrieved seq.base  (cached)
-> installed seq.base
-> retrieved stdlib-shims.0.3.0  (cached)
-> retrieved oseq.0.5.1  (https://opam.ocaml.org/cache)
-> retrieved thread-table.1.0.0  (cached)
-> retrieved topkg.1.1.1  (cached)
-> retrieved dune.3.23.1, dune-configurator.3.23.1  (cached)
-> retrieved uring.2.14.0  (cached)
-> retrieved uutf.1.0.4  (cached)
-> retrieved tsort.2.2.0  (https://opam.ocaml.org/cache)
-> retrieved yojson.3.0.0  (cached)
-> installed cmdliner.2.1.1
-> 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.3.23.1
-> 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 lintcstubs-arity.0.5.2
-> installed multicore-magic.2.3.2
-> installed ocaml-syntax-shims.1.0.0
-> installed ocaml-version.4.1.1
-> 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 dune-configurator.3.23.1
-> installed alcotest.1.9.1
-> installed kcas.0.7.0
-> installed bigstringaf.0.10.0
-> installed iomux.0.4
-> installed mdx.2.5.2
-> installed containers.3.18
-> installed uring.2.14.0
-> installed dscheck.0.5.0
Done.

<><> afl-persistent.1.4 installed successfully ><><><><><><><><><><><><><><><><>
=> afl-persistent is installed, but since the current OCaml compiler does
   not enable AFL instrumentation by default, most packages will not be
   instrumented and fuzzing with afl-fuzz may not be effective.

   To globally enable AFL instrumentation, create an OCaml switch like:

     opam switch create 5.4.1+afl ocaml-variants.5.4.1+options ocaml-option-afl
# To update the current shell environment, run: eval $(opam env)
2026-06-09 10:09.18 ---> using "04513e0d533a5f7672112273cb826872a6693a26ecc8f0ff9ac86287661fd983" from cache

/src: (copy (src .) (dst /src))
2026-06-09 10:09.20 ---> saved as "d11a3e430c8a40bb4ebb8cd35bb31077257cf549a6e024c19b8011ed18b4c4b5"

/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 `0JK3EK8K'.

  [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.
File "lib_eio_linux/tests/fd_sharing.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/lib_eio_linux/tests/fd_sharing.md _build/default/lib_eio_linux/tests/.mdx/fd_sharing.md.corrected
diff --git a/_build/default/lib_eio_linux/tests/fd_sharing.md b/_build/default/lib_eio_linux/tests/.mdx/fd_sharing.md.corrected
index bf8230b..2c12233 100644
--- a/_build/default/lib_eio_linux/tests/fd_sharing.md
+++ b/_build/default/lib_eio_linux/tests/.mdx/fd_sharing.md.corrected
@@ -51,11 +51,5 @@ One domain closes an FD after another domain has enqueued a uring operation ment
        (* Allow the read to complete. *)
        Eio.Flow.close w
     );;
-+Domain 1 enqueuing read on FD
-+Waiting for domain 0...
-+Domain 0 closing FD
-+Domain 0 closed FD; waking domain 1
-+Domain 1 flushing queue
-+Read EOF
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
File "tests/mutex.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/mutex.md _build/default/tests/.mdx/mutex.md.corrected
diff --git a/_build/default/tests/mutex.md b/_build/default/tests/.mdx/mutex.md.corrected
index 47021db..1c81691 100644
--- a/_build/default/tests/mutex.md
+++ b/_build/default/tests/.mdx/mutex.md.corrected
@@ -166,11 +166,7 @@ Or allow interruption and disable the mutex:
    with ex ->
      traceln "Trying to reuse the failed mutex...";
      M.use_ro t (fun () -> assert false);;
-+Cancelling...
-+Trying to reuse the failed mutex...
-Exception:
-Eio__Eio_mutex.Poisoned
- (Eio__core__Exn.Cancelled (Failure "Simulated error")).
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Protection doesn't prevent cancellation while we're still waiting for the lock, though:
File "tests/fd_passing.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/fd_passing.md _build/default/tests/.mdx/fd_passing.md.corrected
diff --git a/_build/default/tests/fd_passing.md b/_build/default/tests/.mdx/fd_passing.md.corrected
index 6d6c86b..b2c91dd 100644
--- a/_build/default/tests/fd_passing.md
+++ b/_build/default/tests/.mdx/fd_passing.md.corrected
@@ -77,7 +77,5 @@ Using named sockets:
     (fun () -> fst (Eio.Net.accept ~sw server))
   in
   test ~to_send:[fd] r w;;
-+Got: "x" plus 1 FDs
-+Read: "foo"
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
File "lib_eio_linux/tests/spawn.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/lib_eio_linux/tests/spawn.md _build/default/lib_eio_linux/tests/.mdx/spawn.md.corrected
diff --git a/_build/default/lib_eio_linux/tests/spawn.md b/_build/default/lib_eio_linux/tests/.mdx/spawn.md.corrected
index 8d45211..915cb9e 100644
--- a/_build/default/lib_eio_linux/tests/spawn.md
+++ b/_build/default/lib_eio_linux/tests/.mdx/spawn.md.corrected
@@ -21,8 +21,7 @@ Setting environment variables:
       ~env:[| "FOO=bar" |];
   ] in
   Promise.await (Process.exit_status child);;
-FOO=bar
-- : Unix.process_status = Unix.WEXITED 0
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Changing directory:
@@ -37,8 +36,7 @@ Changing directory:
       ~env:(Unix.environment ())
   ] in
   Promise.await (Process.exit_status child);;
-/
-- : Unix.process_status = Unix.WEXITED 0
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Changing directory using a file descriptor:
File "tests/sync.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/sync.md _build/default/tests/.mdx/sync.md.corrected
diff --git a/_build/default/tests/sync.md b/_build/default/tests/.mdx/sync.md.corrected
index d37b90f..6c1e47c 100644
--- a/_build/default/tests/sync.md
+++ b/_build/default/tests/.mdx/sync.md.corrected
@@ -33,11 +33,7 @@ Create a promise, fork a thread waiting for it, then fulfull it:
     Fiber.yield ();
     traceln "Thread after yield: %a" (pp_promise Fmt.string) thread;
     traceln "Final result: %s" (Promise.await_exn thread);;
-+Initial state: unresolved
-+After being fulfilled: fulfilled:ok
-+Thread before yield: unresolved
-+Thread after yield: fulfilled:ok
-+Final result: ok
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Create a promise, fork a thread waiting for it, then break it:
File "tests/flow.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/flow.md _build/default/tests/.mdx/flow.md.corrected
diff --git a/_build/default/tests/flow.md b/_build/default/tests/.mdx/flow.md.corrected
index 02b4061..742e1b9 100644
--- a/_build/default/tests/flow.md
+++ b/_build/default/tests/.mdx/flow.md.corrected
@@ -46,11 +46,7 @@ let mock_source =
   test 5;
   test 6;
   test 7;;
-+Got ""
-+Got "foo"
-+Got "fooba"
-+Got "foobar"
-Exception: End_of_file.
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 ## copy
@@ -103,9 +99,7 @@ Copying from src using `Read_source_buffer`:
   Eio_mock.Flow.set_copy_method dst `Read_source_buffer;
   Eio_mock.Flow.on_copy_bytes dst [`Return 3; `Return 5];
   Eio.Flow.copy src dst;;
-+dst: wrote (rsb) ["foo"]
-+dst: wrote (rsb) ["bar"]
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 ## read_all
@@ -118,10 +112,7 @@ Copying from src using `Read_source_buffer`:
   traceln "Input length: %d\nOutput length: %d\nEqual: %b"
     (Cstruct.lenv data) (String.length got) (String.equal got (Cstruct.copyv data));
   ;;
-+Input length: 10240
-+Output length: 10240
-+Equal: true
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 ## write
@@ -131,8 +122,7 @@ Copying from src using `Read_source_buffer`:
   let dst = Eio_mock.Flow.make "dst" in
   Eio_mock.Flow.on_copy_bytes dst [`Return 6];
   Eio.Flow.write dst [Cstruct.of_string "foobar"];;
-+dst: wrote "foobar"
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 ## Pipes
@@ -217,6 +207,5 @@ Even if a fiber is already ready to run, we still perform IO from time to time:
     (fun () ->
        Eio.Flow.write w [Cstruct.of_string "msg"]
     )
-+Got "msg"
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
File "tests/domains.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/domains.md _build/default/tests/.mdx/domains.md.corrected
diff --git a/_build/default/tests/domains.md b/_build/default/tests/.mdx/domains.md.corrected
index 886226d..23792bf 100644
--- a/_build/default/tests/domains.md
+++ b/_build/default/tests/.mdx/domains.md.corrected
@@ -55,8 +55,7 @@ Here, we use a mutex to check that the parent domain really did run while waitin
     );;
 +Spawning new domain...
 +Other fibers can still run
-+Got "Hello from new domain" from spawned domain
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Cancelling another domain:
@@ -105,8 +104,7 @@ Using a cancellation context across domains is not permitted:
        let cc = Promise.await p in
        Eio.Cancel.cancel cc Exit
     );;
-Exception:
-Invalid_argument "Cancellation context accessed from wrong domain!".
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Likewise, switches can't be shared:
@@ -126,7 +124,7 @@ Likewise, switches can't be shared:
        let sw = Promise.await p in
        Switch.fail sw Exit
     );;
-Exception: Invalid_argument "Switch accessed from wrong domain!".
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Registering a release handler across domains:
File "tests/process.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/process.md _build/default/tests/.mdx/process.md.corrected
diff --git a/_build/default/tests/process.md b/_build/default/tests/.mdx/process.md.corrected
index 3a8483c..6845f6b 100644
--- a/_build/default/tests/process.md
+++ b/_build/default/tests/.mdx/process.md.corrected
@@ -83,8 +83,7 @@ Spawning subprocesses in new domains works normally:
 # run @@ fun mgr env ->
   Eio.Domain_manager.run env#domain_mgr @@ fun () ->
   Process.run mgr [ "echo"; "Hello from another domain" ];;
-Hello from another domain
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Calling `await_exit` multiple times on the same spawn just returns the status:
@@ -115,8 +114,7 @@ Changing directory (unconfined):
 # run @@ fun mgr env ->
   let root = env#fs / "/" in
   Process.run mgr ~cwd:root [ "env"; "pwd" ];;
-/
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Changing directory (confined):
@@ -129,8 +127,7 @@ Changing directory (confined):
   Eio.Path.with_open_dir subdir @@ fun subdir ->
   Eio.Path.save (subdir / "test-cwd") "test-data" ~create:(`Exclusive 0o600);
   Process.run mgr ~cwd:subdir [ "cat"; "test-cwd" ];;
-test-data
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Trying to access a path outside of the cwd:
@@ -138,7 +135,7 @@ Trying to access a path outside of the cwd:
 ```ocaml
 # run @@ fun mgr env ->
   Process.run mgr ~cwd:(env#cwd / "..") [ "cat"; "test-cwd" ];;
-Exception: Eio.Io Fs Permission_denied _
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 If a command fails, we get shown the arguments (quoted if necessary):
File "tests/stream.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/stream.md _build/default/tests/.mdx/stream.md.corrected
diff --git a/_build/default/tests/stream.md b/_build/default/tests/.mdx/stream.md.corrected
index c5a035e..66c8c90 100644
--- a/_build/default/tests/stream.md
+++ b/_build/default/tests/.mdx/stream.md.corrected
@@ -122,15 +122,7 @@ A zero-length queue is synchronous:
       take t;
       take t;
     );;
-+Adding 1 to stream
-+Reading from stream
-+Got 1 from stream
-+Reading from stream
-+Added 1 to stream
-+Adding 2 to stream
-+Added 2 to stream
-+Got 2 from stream
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Cancel reading from a stream:
@@ -276,19 +268,7 @@ Writers queue up:
   take t;
   take t;
   take t;;
-+Adding 1 to stream
-+Adding 2 to stream
-+Adding 3 to stream
-+Reading from stream
-+Got 1 from stream
-+Reading from stream
-+Got 2 from stream
-+Reading from stream
-+Got 3 from stream
-+Added 1 to stream
-+Added 2 to stream
-+Added 3 to stream
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Cancelling writing to a stream:
File "tests/time.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/time.md _build/default/tests/.mdx/time.md.corrected
diff --git a/_build/default/tests/time.md b/_build/default/tests/.mdx/time.md.corrected
index 63884c6..2a65d08 100644
--- a/_build/default/tests/time.md
+++ b/_build/default/tests/.mdx/time.md.corrected
@@ -24,7 +24,7 @@ Check sleep works:
   Eio.Time.sleep clock 0.01;
   let t1 = Unix.gettimeofday () in
   assert (t1 -. t0 >= 0.01);;
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Cancelling sleep:
File "tests/network.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/network.md _build/default/tests/.mdx/network.md.corrected
diff --git a/_build/default/tests/network.md b/_build/default/tests/.mdx/network.md.corrected
index 4a3a8d8..bf0858f 100644
--- a/_build/default/tests/network.md
+++ b/_build/default/tests/.mdx/network.md.corrected
@@ -111,12 +111,7 @@ Handling one connection using IPv6:
 
 ```ocaml
 # run (test_address addr6);;
-+Connecting to server...
-+Server accepted connection from client
-+Server received: "Hello from client"
-+Client received: "Bye"
-+Client finished - cancelling server
-Exception: Graceful_shutdown.
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Cancelling the read:
@@ -148,10 +143,7 @@ Cancelling the read:
       let msg = read_all flow in
       traceln "Client received: %S" msg
     );;
-+Connecting to server...
-+Connection opened - cancelling server's read
-+Client received: "Request cancelled"
-- : unit = ()
+Exception: Unix.Unix_error(Unix.ENOMEM, "io_uring_queue_init", "")
 ```
 
 Calling accept when the switch is already off:
"/usr/bin/env" "bash" "-c" "opam exec -- dune build @install @check @runtest && rm -rf _build" failed with exit status 1
2026-06-09 10:09.29: Job failed: Failed: Build failed