Doctests freeze on Rust 1.89

[newpavlov]

We use cargo dinghy as part of getrandom CI. The job no longer works after Rust 1.89 release. Doctests either freeze or fail with errors. For example, see this log.

[newpavlov]

Potential reason: rust-lang/rust#141797 (it looks like the only relevant change in the release changelog)

[kali]

Is this the CI issue you're referring to ? https://github.com/rust-random/getrandom/actions/runs/16894003489/job/47866311749#step:8:114

[newpavlov]

Yes.

[fredszaq]

I don't have the setup to try on an iOs device, but I tried running the tests on android and it seems I have intermittent failures here as well. Running with 1.88 rust I don't have the errors, but the doctest don't seem to run. See example logs bellow

Logs with rust 1.89 : example intermittent failure of doctests

$ cargo dinghy -d android test
   Targeting platform auto-android-aarch64 and device e3cca7b9
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
     Running unittests src/lib.rs (target/aarch64-linux-android/debug/deps/getrandom-1a95ef42647f5f1b)
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing getrandom-1a95ef42647f5f1b to e3cca7b9
     Running getrandom-1a95ef42647f5f1b on e3cca7b9

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=0
     Running tests/mod.rs (target/aarch64-linux-android/debug/deps/mod-6f32a6ec9ce58255)
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing mod-6f32a6ec9ce58255 to e3cca7b9
     Running mod-6f32a6ec9ce58255 on e3cca7b9

running 9 tests
test test_diff ... ok
test test_diff_u32 ... ok
test test_huge ... ok
test test_diff_u64 ... ok
test test_zero ... ok
test test_small ... ok
test test_huge_uninit ... ok
test test_multithreading ... ok
test test_small_uninit ... ok

test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s

FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=0
   Doc-tests getrandom

running 7 tests
test src/lib.rs - fill_uninit (line 88) ... ignored
test src/lib.rs - (line 36) ... FAILED
test src/lib.rs - (line 187) ... FAILED
test src/lib.rs - fill (line 59) ... FAILED
test src/lib.rs - (line 162) ... ok
test src/lib.rs - u64 (line 130) ... ok
test src/lib.rs - u32 (line 116) ... ok

failures:

---- src/lib.rs - (line 36) stdout ----
Test executable failed (exit status: 1).

stdout:
FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=1

stderr:
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing rust_out to e3cca7b9
     Running rust_out on e3cca7b9
/system/bin/sh: /data/local/tmp/dinghy/getrandom/_dinghy_rust_out: Text file busy
[2025-08-12T12:03:19Z ERROR cargo_dinghy] Failed


---- src/lib.rs - (line 187) stdout ----
Test executable failed (exit status: 1).

stdout:
FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=1

stderr:
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing rust_out to e3cca7b9
     Running rust_out on e3cca7b9
/system/bin/sh: /data/local/tmp/dinghy/getrandom/_dinghy_rust_out: Text file busy
[2025-08-12T12:03:19Z ERROR cargo_dinghy] Failed


---- src/lib.rs - fill (line 59) stdout ----
Test executable failed (exit status: 1).

stdout:
FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=1

stderr:
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing rust_out to e3cca7b9
     Running rust_out on e3cca7b9
/system/bin/sh: /data/local/tmp/dinghy/getrandom/_dinghy_rust_out: Text file busy
[2025-08-12T12:03:19Z ERROR cargo_dinghy] Failed



failures:
    src/lib.rs - (line 187)
    src/lib.rs - (line 36)
    src/lib.rs - fill (line 59)

test result: FAILED. 3 passed; 3 failed; 1 ignored; 0 measured; 0 filtered out; finished in 0.81s

error: doctest failed, to rerun pass `--doc`

same command with rust 1.88 : no doctests run

$ cargo +1.88.0 dinghy -d android test
   Targeting platform auto-android-aarch64 and device e3cca7b9
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
     Running unittests src/lib.rs (target/aarch64-linux-android/debug/deps/getrandom-c0887d3554f0bc89)
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing getrandom-c0887d3554f0bc89 to e3cca7b9
     Running getrandom-c0887d3554f0bc89 on e3cca7b9

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=0
     Running tests/mod.rs (target/aarch64-linux-android/debug/deps/mod-747b7a6b91fd8457)
   Targeting platform auto-android-aarch64 and device e3cca7b9
  Installing mod-747b7a6b91fd8457 to e3cca7b9
     Running mod-747b7a6b91fd8457 on e3cca7b9

running 9 tests
test test_diff ... ok
test test_diff_u32 ... ok
test test_diff_u64 ... ok
test test_zero ... ok
test test_huge ... ok
test test_huge_uninit ... ok
test test_small ... ok
test test_small_uninit ... ok
test test_multithreading ... ok

test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s

FORWARD_RESULT_TO_DINGHY_BECAUSE_ADB_DOES_NOT=0

I guess the problem is this rust-lang/cargo#15462

[fredszaq]

Ok I have a repro on the sample project, I'm digging in

[fredszaq]

see #256 for a fix. I couldn't test it on ios but it works on android and ssh devices

[fredszaq]

Closing as #256 is merged