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error: mixing -Zsanitizer will cause an ABI mismatch - when running doctests #146465

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#148068
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error: mixing -Zsanitizer will cause an ABI mismatch - when running doctests#146465
#148068
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A-doctestsArea: Documentation tests, run by rustdocA-sanitizersArea: Sanitizers for correctness and code qualityC-bugCategory: This is a bug.F-target_modifiers`#![feature(target_modifiers)]`T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

Description

@gendx
gendx
opened on Sep 12, 2025

I tried these commands (following the sanitizer tutorial) on the code at https://github.com/gendx/paralight/tree/791d03a794b3c2089186979687065d107532fc93:

export RUSTFLAGS="-Zsanitizer=thread"
export RUSTDOCFLAGS="-Zsanitizer=thread"
cargo +nightly test --release -Zbuild-std --target=x86_64-unknown-linux-gnu

I expected to see this happen: tests should run with thread sanitizer enabled.

Instead, this happened: regular tests ran fine, but doc tests failed to compile with the following error. In particular, "help: set -Zsanitizer=thread in this crate" is strange given that I've set RUSTDOCFLAGS="-Zsanitizer=thread".

error: mixing `-Zsanitizer` will cause an ABI mismatch in crate `paralight`
 --> src/lib.rs:9:1
  |
9 | #![doc = include_str!("../README.md")]
  | ^
  |
  = help: the `-Zsanitizer` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
  = note: unset `-Zsanitizer` in this crate is incompatible with `-Zsanitizer=thread` in dependency `std`
  = help: set `-Zsanitizer=thread` in this crate or unset `-Zsanitizer` in `std`
  = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=sanitizer` to silence this error

I suspect this might be related to #138736 or more broadly the work tracked in #138453.

Meta

rustc +nightly --version --verbose:

rustc 1.91.0-nightly (5eda692e7 2025-09-11)
binary: rustc
commit-hash: 5eda692e73f37dcbe2437ce878db7bb71f323e74
commit-date: 2025-09-11
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly
LLVM version: 21.1.1

Activity

  1. gendx
    added
    C-bugCategory: This is a bug.
    on Sep 12, 2025
  2. rustbot
    added
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Sep 12, 2025

  3. iorizu commented on Sep 12, 2025

    @iorizu
    iorizu
    on Sep 12, 2025
    Contributor

    The CI for the crate triomphe fails for this exact reason also. I've tested various versions and the one that introduces the failure is nightly 2025-09-06 (rustc 6c699a372). That version contains #138736.

    $ git log --first-parent --oneline af00ff2ce..6c699a372
6c699a37235 Auto merge of #146255 - fmease:rollup-1v0kp8i, r=fmease
99317ef14d0 Auto merge of #146121 - Muscraft:filter-suggestion-parts, r=petrochenkov
9cd272dc853 Auto merge of #146044 - estebank:issue-88727, r=chenyukang
c559c4a7418 Auto merge of #146224 - tgross35:rollup-1bgjms3, r=tgross35
ad85bc524b1 Auto merge of #144737 - petrochenkov:extprelcache, r=davidtwco
91edc3ebccc Auto merge of #146218 - flip1995:clippy-subtree-update, r=Manishearth
b3cfb8faf84 Auto merge of #138736 - azhogin:azhogin/sanitizers-target-modificators, r=rcvalle

    af00ff2ce is the commit hash of nightly 2025-09-05.

    That PR (and the error) says that adding -Cunsafe-allow-abi-mismatch=sanitizer will fix the issue, but it feels like that shouldn't be necessary. Assuming that the issue is that the std lib is being built with -Zsanitizer=thread set and the doctests are being built with -Zsanitizer unset, shouldn't it be the case that the RUSTDOCFLAGS='-Zsanitizer=thread' env variables force the tests to be built with the sanitizer option set? If not, that feels like a bug.

  4. Darksonn commented on Sep 12, 2025

    @Darksonn
    Darksonn
    on Sep 12, 2025
    Member

    Similar to #144521. Probably has a similar to fix to #144523.

  5. Darksonn commented on Sep 12, 2025

    @Darksonn
    Darksonn
    on Sep 12, 2025
    Member

    cc @rcvalle @azhogin

  6. Darksonn
    added
    A-sanitizersArea: Sanitizers for correctness and code quality
    A-doctestsArea: Documentation tests, run by rustdoc
    F-target_modifiers`#![feature(target_modifiers)]`
    on Sep 12, 2025
  7. github-project-automation
    added this to testing-devex backlogon Sep 12, 2025
  8. Darksonn
    added
    T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
    and removed
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Sep 12, 2025
  9. marmeladema
    added 4 commits that reference this issue on Sep 15, 2025

    Avoid running doc tests with sanitizer

    e607d5d

    Avoid running doc tests with sanitizer

    263c144

    Avoid running doc tests with sanitizer

    68e79f8

    Avoid running doc tests with sanitizer

    38f496a

  10. 25 remaining items

  11. bsach64
    added a commit that references this issue on Nov 18, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    aa176f7
  12. Thomasdezeeuw
    added 2 commits that reference this issue on Nov 18, 2025

    Enable tests docs under sanitizer again

    efd8b64

    Enable tests docs under sanitizer again

    b0578c2
  13. mj22226
    added a commit that references this issue on Nov 21, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    028d38f
  14. johnny-mnemonic
    added a commit that references this issue on Nov 22, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    97b78fc
  15. Whissi
    added a commit that references this issue on Nov 24, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    5a127a4
  16. opsiff
    added 2 commits that reference this issue on Nov 24, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    72e9472

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    f51eecf
  17. oraclelinuxkernel
    added a commit that references this issue on Nov 28, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    42084c7
  18. hodgesds
    added a commit that references this issue on Dec 8, 2025

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    89dc8b7
  19. tuxedo-bot
    added a commit that references this issue on Jan 8, 2026

    rust: kbuild: workaround `rustdoc` doctests modifier bug

    30354cc
  20. ChunMinChang
    added 3 commits that reference this issue on Jan 27, 2026

    Fix sanitizer ABI mismatch error on Rust nightly

    6f38398

    Fix sanitizer ABI mismatch error on Rust nightly

    6b2e5d4

    Fix sanitizer ABI mismatch error on Rust nightly

    fd590e2
  21. intel-lab-lkp
    added a commit that references this issue on Apr 20, 2026

    rust: Makefile: bound rustdoc workaround to affected versions

    2effea4
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    A-doctestsArea: Documentation tests, run by rustdocA-sanitizersArea: Sanitizers for correctness and code qualityC-bugCategory: This is a bug.F-target_modifiers`#![feature(target_modifiers)]`T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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