Organisationsocaml-multicoreeio654ca6 ()macos-homebrew-5.3_arm64_opam-2.3

macos-homebrew-5.3_arm64_opam-2.3

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2025-03-03 10:13.15: New job: test ocaml-multicore/eio https://github.com/ocaml-multicore/eio.git#refs/pull/796/head (654ca6c40a5309fef22390488a955a84e099c2b9) (macos-arm64:macos-homebrew-5.3_arm64_opam-2.3)
Base: macos-homebrew-ocaml-5.3
Opam project build

To reproduce locally:

git clone --recursive "https://github.com/ocaml-multicore/eio.git" && cd "eio" && git fetch origin "refs/pull/796/head" && git reset --hard 654ca6c4
cat > Dockerfile <<'END-OF-DOCKERFILE'
FROM macos-homebrew-ocaml-5.3
# macos-homebrew-5.3_arm64_opam-2.3
USER 1000:1000
ENV CLICOLOR_FORCE="1"
ENV OPAMCOLOR="always"
RUN ln -f ~/local/bin/opam-2.3 ~/local/bin/opam
RUN opam init --reinit -ni
RUN uname -rs && opam exec -- ocaml -version && opam --version
RUN cd ~/opam-repository && (git cat-file -e 5c627de42309bb6474331d403efeb6d68d617b1e || git fetch origin master) && git reset -q --hard 5c627de42309bb6474331d403efeb6d68d617b1e && git log --no-decorate -n1 --oneline && opam update -u
COPY --chown=1000:1000 eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam ./src/./
RUN opam pin add -yn eio_windows.dev './src/./' && \
    opam pin add -yn eio_posix.dev './src/./' && \
    opam pin add -yn eio_main.dev './src/./' && \
    opam pin add -yn eio_linux.dev './src/./' && \
    opam pin add -yn eio.dev './src/./'
RUN echo '(lang dune 3.0)' > './src/./dune-project'
ENV DEPS="afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 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.1.3.0 conf-bash.1 containers.3.15 cppo.1.8.0 crowbar.0.2.1 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.3.17.2 dune-configurator.3.17.2 either.1.0.0 fmt.0.9.0 hmap.0.8.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.7.3 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2"
ENV CI="true"
ENV OCAMLCI="true"
RUN opam update --depexts && opam install --cli=2.3 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS
RUN opam install $DEPS
COPY --chown=1000:1000 . ./src
RUN cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build

END-OF-DOCKERFILE
docker build .
END-REPRO-BLOCK

2025-03-03 10:13.15: Using cache hint "ocaml-multicore/eio-macos-homebrew-ocaml-5.3-macos-homebrew-5.3_arm64_opam-2.3-a1700417fc0074fc1a5018cfc9a9c144"
2025-03-03 10:13.15: Using OBuilder spec:
((from macos-homebrew-ocaml-5.3)
 (comment macos-homebrew-5.3_arm64_opam-2.3)
 (user (uid 1000) (gid 1000))
 (env CLICOLOR_FORCE 1)
 (env OPAMCOLOR always)
 (run (shell "ln -f ~/local/bin/opam-2.3 ~/local/bin/opam"))
 (run (shell "opam init --reinit -ni"))
 (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "cd ~/opam-repository && (git cat-file -e 5c627de42309bb6474331d403efeb6d68d617b1e || git fetch origin master) && git reset -q --hard 5c627de42309bb6474331d403efeb6d68d617b1e && git log --no-decorate -n1 --oneline && opam update -u"))
 (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
       (dst ./src/./))
 (run (network host)
      (shell  "opam pin add -yn eio_windows.dev './src/./' && \
             \nopam pin add -yn eio_posix.dev './src/./' && \
             \nopam pin add -yn eio_main.dev './src/./' && \
             \nopam pin add -yn eio_linux.dev './src/./' && \
             \nopam pin add -yn eio.dev './src/./'"))
 (run (network host)
      (shell "echo '(lang dune 3.0)' > './src/./dune-project'"))
 (env DEPS "afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 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.1.3.0 conf-bash.1 containers.3.15 cppo.1.8.0 crowbar.0.2.1 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.3.17.2 dune-configurator.3.17.2 either.1.0.0 fmt.0.9.0 hmap.0.8.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.7.3 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2")
 (env CI true)
 (env OCAMLCI true)
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "opam update --depexts && opam install --cli=2.3 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS"))
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell "opam install $DEPS"))
 (copy (src .) (dst ./src))
 (run (shell "cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build"))
)

2025-03-03 10:13.15: Waiting for resource in pool OCluster
2025-03-03 15:36.40: Waiting for worker…
2025-03-03 19:07.36: Got resource from pool OCluster
Building on m1-worker-02
All commits already cached
HEAD is now at 654ca6c Introduce Buf_write.of_flow

(from macos-homebrew-ocaml-5.3)
2025-03-03 19:07.36 ---> using "6ee950b55569b1a3f8a7953dc679318bf303d3a70ac7d49901c0ac2ca3805d7c" from cache

/: (comment macos-homebrew-5.3_arm64_opam-2.3)

/: (user (uid 1000) (gid 1000))

/: (env CLICOLOR_FORCE 1)

/: (env OPAMCOLOR always)

/: (run (shell "ln -f ~/local/bin/opam-2.3 ~/local/bin/opam"))
2025-03-03 19:07.36 ---> using "8efc335cb5004a650aab29e72b9849a2b2e2f0853bc55d3a74763c7cceed5d74" from cache

/: (run (shell "opam init --reinit -ni"))
No configuration file found, using 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 /Users/mac1000/.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] no changes from git+file:///Users/mac1000/opam-repository
2025-03-03 19:07.36 ---> using "e29fa6de89fe919799ac81fd4a1c768d8341cedf873c17042854467d2aebeceb" from cache

/: (run (shell "uname -rs && opam exec -- ocaml -version && opam --version"))
Darwin 23.4.0
The OCaml toplevel, version 5.3.0
2.3.0
2025-03-03 19:07.36 ---> using "a268524b45b0c90a951719c2a6c8c78c0b8a0fec90c9f437befd49b0008dc673" from cache

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (network host)
        (shell "cd ~/opam-repository && (git cat-file -e 5c627de42309bb6474331d403efeb6d68d617b1e || git fetch origin master) && git reset -q --hard 5c627de42309bb6474331d403efeb6d68d617b1e && git log --no-decorate -n1 --oneline && opam update -u"))
From https://github.com/ocaml/opam-repository
 * branch                  master     -> FETCH_HEAD
   67e940587b..5c627de423  master     -> origin/master
5c627de423 Merge pull request #27523 from hannesm/re-add-base-ocamlbuild

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from git+file:///Users/mac1000/opam-repository

Everything as up-to-date as possible (run with --verbose to show unavailable upgrades).

The following packages are not being upgraded because the new versions conflict with other installed packages:
  - ocaml.5.4.0
However, you may "opam upgrade" these packages explicitly, which will ask permission to downgrade or uninstall the conflicting packages.
Nothing to do.
# To update the current shell environment, run: eval $(opam env)
2025-03-03 19:07.36 ---> using "40a30536345e614b63bd39817d70a4a93c0422453169bc04ff09376c0d5b8475" from cache

/: (copy (src eio_windows.opam eio_posix.opam eio_main.opam eio_linux.opam eio.opam)
         (dst ./src/./))
2025-03-03 19:07.38 ---> saved as "9a0edb5e6f414a2142eadeab3e9737c953c04fc43ee29e720ece215f5962f1e4"

/: (run (network host)
        (shell  "opam pin add -yn eio_windows.dev './src/./' && \
               \nopam pin add -yn eio_posix.dev './src/./' && \
               \nopam pin add -yn eio_main.dev './src/./' && \
               \nopam pin add -yn eio_linux.dev './src/./' && \
               \nopam pin add -yn eio.dev './src/./'"))
[eio_windows.dev] synchronised (file:///Users/mac1000/src)
eio_windows is now pinned to file:///Users/mac1000/src (version dev)
[eio_posix.dev] synchronised (file:///Users/mac1000/src)
eio_posix is now pinned to file:///Users/mac1000/src (version dev)
[eio_main.dev] synchronised (file:///Users/mac1000/src)
eio_main is now pinned to file:///Users/mac1000/src (version dev)
[eio_linux.dev] synchronised (file:///Users/mac1000/src)
eio_linux is now pinned to file:///Users/mac1000/src (version dev)
[eio.dev] synchronised (file:///Users/mac1000/src)
eio is now pinned to file:///Users/mac1000/src (version dev)
2025-03-03 19:07.51 ---> saved as "c9e262a5d4ecdf561d6adc156c5dd23a4cccabd0934f81554400f5a8a288c328"

/: (run (network host)
        (shell "echo '(lang dune 3.0)' > './src/./dune-project'"))
2025-03-03 19:07.52 ---> saved as "2134f4c6bcf6da00798ca5cad23584fc3193f85916551963bfd3a033a14f9555"

/: (env DEPS "afl-persistent.1.4 alcotest.1.8.0 astring.0.8.5 backoff.0.1.1 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.1.3.0 conf-bash.1 containers.3.15 cppo.1.8.0 crowbar.0.2.1 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.3.17.2 dune-configurator.3.17.2 either.1.0.0 fmt.0.9.0 hmap.0.8.1 iomux.0.3 kcas.0.7.0 logs.0.7.0 lwt-dllist.1.0.1 mdx.2.5.0 mtime.2.1.0 multicore-magic.2.3.1 ocaml.5.3.0 ocaml-base-compiler.5.3.0 ocaml-compiler.5.3.0 ocaml-config.3 ocaml-options-vanilla.1 ocaml-syntax-shims.1.0.0 ocaml-version.3.7.3 ocamlbuild.0.16.1 ocamlfind.1.9.8 ocplib-endian.1.2 optint.0.3.0 oseq.0.5.1 psq.0.2.1 re.1.12.0 result.1.5 seq.base stdlib-shims.0.3.0 thread-table.1.0.0 topkg.1.0.7 tsort.2.1.0 uutf.1.0.3 yojson.2.2.2")

/: (env CI true)

/: (env OCAMLCI true)

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (network host)
        (shell "opam update --depexts && opam install --cli=2.3 --depext-only -y eio_windows.dev eio_posix.dev eio_main.dev eio.dev $DEPS"))
+ /opt/homebrew/bin/brew "update"
- ==> Updating Homebrew...
- Already up-to-date.

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>
[eio.dev] synchronised (file:///Users/mac1000/src)
[eio_posix.dev] synchronised (file:///Users/mac1000/src)
[eio_main.dev] synchronised (file:///Users/mac1000/src)
[eio_windows.dev] synchronised (file:///Users/mac1000/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).
2025-03-03 19:08.10 ---> saved as "ccf9e870db9ad3722ee223a8e3a61422d71b44f99554d9af6846bffb78707ff2"

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (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 46 packages
  - install afl-persistent       1.4
  - install alcotest             1.8.0
  - install astring              0.8.5
  - install backoff              0.1.1
  - install base-bytes           base
  - install bigstringaf          0.10.0
  - install camlp-streams        5.0.1
  - install cmdliner             1.3.0
  - install conf-bash            1
  - install containers           3.15
  - install cppo                 1.8.0
  - install crowbar              0.2.1
  - 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                 3.17.2
  - install dune-configurator    3.17.2
  - install either               1.0.0
  - install fmt                  0.9.0
  - install hmap                 0.8.1
  - install iomux                0.3
  - install kcas                 0.7.0
  - install logs                 0.7.0
  - install lwt-dllist           1.0.1
  - install mdx                  2.5.0
  - install mtime                2.1.0
  - install multicore-magic      2.3.1
  - install ocaml-syntax-shims   1.0.0
  - install ocaml-version        3.7.3
  - install ocamlbuild           0.16.1
  - install ocamlfind            1.9.8
  - install ocplib-endian        1.2
  - install optint               0.3.0
  - install oseq                 0.5.1
  - install psq                  0.2.1
  - install re                   1.12.0
  - install result               1.5
  - install seq                  base
  - install stdlib-shims         0.3.0
  - install thread-table         1.0.0
  - install topkg                1.0.7
  - install tsort                2.1.0
  - install uutf                 1.0.3
  - install yojson               2.2.2

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved afl-persistent.1.4  (cached)
-> retrieved astring.0.8.5  (cached)
-> retrieved backoff.0.1.1  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved camlp-streams.5.0.1  (cached)
-> retrieved cmdliner.1.3.0  (cached)
-> installed conf-bash.1
-> retrieved cppo.1.8.0  (cached)
-> retrieved alcotest.1.8.0  (cached)
-> retrieved crowbar.0.2.1  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved cstruct.6.2.0  (cached)
-> retrieved domain-local-await.1.0.1  (cached)
-> retrieved domain-local-timeout.1.0.1  (cached)
-> retrieved dscheck.0.5.0  (cached)
-> retrieved containers.3.15  (cached)
-> retrieved either.1.0.0  (cached)
-> retrieved fmt.0.9.0  (cached)
-> retrieved hmap.0.8.1  (cached)
-> retrieved iomux.0.3  (cached)
-> retrieved logs.0.7.0  (cached)
-> retrieved kcas.0.7.0  (cached)
-> retrieved lwt-dllist.1.0.1  (cached)
-> retrieved mtime.2.1.0  (cached)
-> retrieved mdx.2.5.0  (cached)
-> retrieved multicore-magic.2.3.1  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml-version.3.7.3  (cached)
-> retrieved ocamlfind.1.9.8  (cached)
-> retrieved ocplib-endian.1.2  (cached)
-> retrieved ocamlbuild.0.16.1  (cached)
-> retrieved oseq.0.5.1  (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.1.12.0  (cached)
-> retrieved stdlib-shims.0.3.0  (cached)
-> retrieved thread-table.1.0.0  (cached)
-> retrieved tsort.2.1.0  (cached)
-> retrieved uutf.1.0.3  (cached)
-> retrieved topkg.1.0.7  (cached)
-> retrieved yojson.2.2.2  (cached)
-> retrieved dune.3.17.2, dune-configurator.3.17.2  (cached)
-> installed ocamlbuild.0.16.1
-> installed cmdliner.1.3.0
-> installed ocamlfind.1.9.8
-> installed base-bytes.base
-> installed topkg.1.0.7
-> installed hmap.0.8.1
-> installed uutf.1.0.3
-> installed mtime.2.1.0
-> installed astring.0.8.5
-> installed fmt.0.9.0
-> installed logs.0.7.0
-> installed dune.3.17.2
-> installed csexp.1.5.2
-> installed backoff.0.1.1
-> installed lwt-dllist.1.0.1
-> installed afl-persistent.1.4
-> installed either.1.0.0
-> installed cstruct.6.2.0
-> installed cppo.1.8.0
-> installed camlp-streams.5.0.1
-> installed ocaml-version.3.7.3
-> installed optint.0.3.0
-> installed multicore-magic.2.3.1
-> installed ocplib-endian.1.2
-> installed ocaml-syntax-shims.1.0.0
-> installed oseq.0.5.1
-> installed psq.0.2.1
-> installed result.1.5
-> installed stdlib-shims.0.3.0
-> installed crowbar.0.2.1
-> installed thread-table.1.0.0
-> installed tsort.2.1.0
-> installed domain-local-timeout.1.0.1
-> installed domain-local-await.1.0.1
-> installed dune-configurator.3.17.2
-> installed re.1.12.0
-> installed kcas.0.7.0
-> installed bigstringaf.0.10.0
-> installed yojson.2.2.2
-> installed iomux.0.3
-> installed alcotest.1.8.0
-> installed containers.3.15
-> installed mdx.2.5.0
-> 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 5.3.0+afl ocaml-variants.5.3.0+options ocaml-option-afl
# To update the current shell environment, run: eval $(opam env)
2025-03-03 19:08.58 ---> saved as "5b8419024436c6259f6f0c98de9793208f7723b21b6a2e30630c0fe36c944f63"

/: (copy (src .) (dst ./src))
2025-03-03 19:09.00 ---> saved as "a87d65c97480765e7a2ea3ed0d49699866ae71d4d5816dee7e6f86b3716aac82"

/: (run (shell "cd ./src && opam exec -- dune build --only-packages=eio_windows,eio_posix,eio_main,eio @install @check @runtest && rm -rf _build"))
File "fuzz/dune", line 4, characters 23-37:
4 |   (names fuzz_buf_read fuzz_buf_write fuzz_inherit_fds))
                           ^^^^^^^^^^^^^^
(cd _build/default/fuzz && ./fuzz_buf_write.exe)
random ops: FAIL

When given the input:

    [[#2 schedule_cstruct:""]; false]
    
the test threw an exception:

    Eio_mock__Backend.Deadlock_detected
    Raised at Eio_mock__Backend.run_full in file "lib_eio/mock/backend.ml", line 112, characters 12-35
    Called from Crowbar.gen_apply.go.(fun) in file "src/crowbar.ml", line 325, characters 16-19
    
(cd _build/default/fuzz && ./fuzz_inherit_fds.exe)
inherit_fds: PASS

(cd _build/default/fuzz && ./fuzz_buf_read.exe)
random ops: PASS

File "tests/buf_write.md", line 1, characters 0-0:
/usr/bin/git --no-pager diff --no-index --color=always -u _build/default/tests/buf_write.md _build/default/tests/.mdx/buf_write.md.corrected
diff --git a/_build/default/tests/buf_write.md b/_build/default/tests/.mdx/buf_write.md.corrected
index a5855d7..13e02ea 100644
--- a/_build/default/tests/buf_write.md
+++ b/_build/default/tests/.mdx/buf_write.md.corrected
@@ -17,7 +17,7 @@ let flow = Eio_mock.Flow.make "flow"
   Write.with_flow flow @@ fun w ->
   Write.string w "Hello"; Write.char w ' '; Write.string w "world";;
 +flow: wrote "Hello world"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Auto-commit
@@ -32,7 +32,7 @@ If we yield then we flush the data so far:
   Write.string w "world";;
 +flow: wrote "Hello "
 +flow: wrote "world"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Read source buffer
@@ -47,7 +47,7 @@ If supported by the flow, we can avoid copying:
   Write.schedule_cstruct w (Cstruct.of_string "world");
   Write.char w '!';;
 +flow: wrote ["Hello "; "world"; "!"]
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Pausing
@@ -62,7 +62,7 @@ Without pausing:
   Write.string w "world";;
 +flow: wrote "Hello... "
 +flow: wrote "world"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 With pausing
@@ -76,7 +76,7 @@ With pausing
   Write.unpause w;
   Write.string w "world";;
 +flow: wrote ["Hello... "; "world"]
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Empty writes
@@ -88,7 +88,7 @@ With pausing
   Write.bytes t (Bytes.make 0 '\000');
   Write.cstruct t Cstruct.empty;
   Write.schedule_cstruct t Cstruct.empty;;
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Endianness
@@ -101,7 +101,7 @@ With pausing
   Write.BE.uint16 t 5;;
 +flow: wrote "\005\000"
 +flow: wrote "\000\005"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Writes
@@ -120,7 +120,7 @@ With pausing
 +flow: wrote "test"
 +flow: wrote "test"
 +flow: wrote "A"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Multiple writes
@@ -141,9 +141,7 @@ With pausing
   Write.with_flow ~initial_size:1 flow f;;
 +With room:
 +flow: wrote "testtestte"
-+Without room:
-+flow: wrote ["te"; "st"; "te"; "st"; "te"]
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Formatting
@@ -181,7 +179,7 @@ With pausing
 +flow: wrote "tcp:[::1]:8080This is a second call to printf\n"
 +            "\n"
 +flow: wrote "Flushed. Goodbye\n"
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Flushing
@@ -214,7 +212,7 @@ Eio_mock.Flow.on_copy_bytes flow [
 +flow: wrote "Hel"
 +flow: wrote "lo"
 +Flushed
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 Multiple flushes:
@@ -242,7 +240,7 @@ Multiple flushes:
 +flow: wrote "f"
 +3rd flush
 +Done
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 Check flush waits for the write to succeed:
@@ -278,7 +276,7 @@ let slow_writer =
   traceln "Flush complete"
 +Write "test"
 +Flush complete
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Scheduling
@@ -299,7 +297,7 @@ let slow_writer =
 +flow: wrote ["one"; "two"]
 +flow: wrote "end"
 +Should all be flushed by now.
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Cancellation
@@ -339,7 +337,7 @@ Exception: Failure "Simulated error".
   Write.with_flow flow @@ fun t ->
   try Write.string t "hi" ~off:100; assert false
   with Invalid_argument _ -> ();;
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 ## Serialize
@@ -399,8 +397,6 @@ We still flush the output on error:
   Write.string t "foo";
   failwith "Simulated error";;
 +flow: wrote "f"
-+flow: wrote "o"
-+flow: wrote "o"
 Exception: Failure "Simulated error".
 ```
 
@@ -480,7 +476,7 @@ But the flush does succeed in the normal case:
 +flow: wrote "fo"
 +flow: wrote "o"
 +Flush succeeded
-- : unit = ()
+Exception: Eio_mock__Backend.Deadlock_detected.
 ```
 
 If we don't pass a switch then we can still cancel flushes manually:
2025-03-03 20:07.36: Cancelling: Timeout (60.0 minutes)
Job cancelled
2025-03-03 20:07.36: Timeout (60.0 minutes)