[Pkg-rust-maintainers] Bug#1078430: rust-just: flaky autopkgtest on s390x: *nearly* always fails

[Blair Noctis]

On 11/08/2024 01:17, Blair Noctis wrote:
> On 10/08/2024 18:04, Paul Gevers wrote:
(...)
>> https://ci.debian.net/packages/r/rust-just/testing/s390x/50327770/
>>
>> 149s failures:
>> 149s
>> 149s ---- choose::status_error stdout ----
>> 149s thread 'choose::status_error' panicked at tests/choose.rs:209:3:
>> 149s assertion failed: Regex::new("^error: Chooser `exit-2` failed: exit (code|
>> status): 2\n$").unwrap().is_match(str::from_utf8(&output.stderr).unwrap())
> (...)
>
> Hi Paul,
>
> Thanks for bringing attention to it. I ran the tests a few times on zelenka and
> on debci, which all passed. Since it's kind of a test-Heisenbug with no report
> in real usage, I'll mark the tests ignored as a temporary workaround.

This particular error didn't give much information other than stderr didn't
match what's expected, but two others said "Broken pipe". A few searches
revealed it's because Rust ignores SIGPIPE [1] by default and the println! macro
just panics when an error occurred [2]. Setting SIGPIPE handler back to SIG_DFL
works in a simple repro. I'll bring the severity down to important after
uploading the fix, please revert if the problem happens again.

On 11/08/2024 03:21, Paul Gevers wrote:
> On 10-08-2024 19:17, Blair Noctis wrote:
>> On the infra side, I'm pondering the idea of a "debug" patch that captures more
>> information the next time it goes south. However, "fixing" (or rather frankly,
>> ignoring) the test failures makes following runs pass. Is there a way to monitor
>> such an output in passed runs, other than downloading every run and grepping
>> through them?
> 
> Not really.
> 
> If you think that might be helpful, I can give you access to a testbed on the
> host that runs our tests.

Guess this is no longer needed ;) still, thanks for offering to help.

[1]: https://github.com/rust-lang/rust/issues/46016
[2]: https://github.com/BurntSushi/advent-of-code/issues/17

-- 
Sdrager,
Blair Noctis
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