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zeroize: `tests::zeroize_c_string` fails on i386

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
rust

Research direction

Start at tests::zeroize_c_string in src/lib.rs around lines 922-936 and compare the Debian i386 failure with runs on other architectures. Use the linked Debian log to identify why the assertion sees 21 instead of 0; done means the test passes on i386 without regressing other architectures.

Written by the indexing model from the issue text.

Description

Hi,

while testing zeroize on Debian infrastructure one test fails (it does not fail on other architectures).

---- tests::zeroize_c_string stdout ----
thread 'tests::zeroize_c_string' panicked at 'assertion failed: `(left == right)`
  left: `21`,
 right: `0`', src/lib.rs:936:17
stack backtrace:
   0: rust_begin_unwind
             at /usr/src/rustc-1.58.1/library/std/src/panicking.rs:498:5
   1: core::panicking::panic_fmt
             at /usr/src/rustc-1.58.1/library/core/src/panicking.rs:107:14
   2: core::panicking::assert_failed_inner
   3: core::panicking::assert_failed
             at /usr/src/rustc-1.58.1/library/core/src/panicking.rs:145:5
   4: zeroize::tests::zeroize_c_string
             at ./src/lib.rs:936:17
   5: zeroize::tests::zeroize_c_string::{{closure}}
             at ./src/lib.rs:922:5
   6: core::ops::function::FnOnce::call_once
             at /usr/src/rustc-1.58.1/library/core/src/ops/function.rs:227:5
   7: core::ops::function::FnOnce::call_once
             at /usr/src/rustc-1.58.1/library/core/src/ops/function.rs:227:5

Please find the full log at https://ci.debian.net/data/autopkgtest/testing/i386/r/rust-zeroize/22485575/log.gz

Any hints how to debug this?

Dominant language
Rust
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Merged PRs (30d)
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