Regression in 2024-11-28: llvm-cov export errors with "truncated coverage data" #133606
Closed
Description
Code
Beginning with today's nightly, processing coverage produced by rustc binaries fails. Here is an example CI run: https://github.com/pyca/cryptography/actions/runs/12077661037/job/33681030705?pr=12066
The relevant snippet:
nox > /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov export /home/runner/work/cryptography/cryptography/.nox/tests/lib/python3.12/site-packages/cryptography/hazmat/bindings/_rust.abi3.so -instr-profile=rust-cov.profdata '--ignore-filename-regex=[/\].cargo[/\]' '--ignore-filename-regex=[/\]rustc[/\]' '--ignore-filename-regex=[/\].rustup[/\]toolchains[/\]' '--ignore-filename-regex=[/\]target[/\]' --format=lcov
nox > Command /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-cov export /home/runner/work/cryptography/cryptography/.nox/tests/lib/python3.12/site-packages/cryptography/hazmat/bindings/_rust.abi3.so -instr-profile=rust-cov.profdata '--ignore-filename-regex=[/\].cargo[/\]' '--ignore-filename-regex=[/\]rustc[/\]' '--ignore-filename-regex=[/\].rustup[/\]toolchains[/\]' '--ignore-filename-regex=[/\]target[/\]' --format=lcov failed with exit code 1:
error: failed to load coverage: '/home/runner/work/cryptography/cryptography/.nox/tests/lib/python3.12/site-packages/cryptography/hazmat/bindings/_rust.abi3.so': truncated coverage data
error: could not load coverage information
#133418 is the only change in the regression range with a commit message mentioning coverage. cc: @Zalathar
Happy Thanksgiving!
Version it worked on
rustc 1.85.0-nightly (6b6a867ae 2024-11-27)
Version with regression
rustc 1.85.0-nightly (a2545fd6f 2024-11-28)
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