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ci(anvil): limit mutation concurrency #765

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04ddc4f
ci(anvil): limit mutation concurrency
martin-kolinek Sep 16, 2026
c1ff0c1
test(anvil): exercise parent mutation diff
martin-kolinek Sep 16, 2026
8b08b3d
test(anvil): trace suspect allocator mutant
martin-kolinek Sep 17, 2026
b8d6844
test(anvil): trace under-commit mutant
martin-kolinek Sep 17, 2026
cdb14ba
test(anvil): trace next allocator mutants
martin-kolinek Sep 17, 2026
8329b97
test(anvil): trace telemetry iterator mutants
martin-kolinek Sep 17, 2026
2e3756c
test(anvil): isolate empty telemetry iterator
martin-kolinek Sep 17, 2026
c12b303
test(anvil): isolate non-clearing bitmap mutant
martin-kolinek Sep 17, 2026
14a40a6
test(rallocator): skip runaway bitmap mutants
martin-kolinek Sep 17, 2026
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5 changes: 4 additions & 1 deletion .github/workflows/anvil-pr-impl.yml
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Expand Up @@ -316,7 +316,10 @@ jobs:
publish_commit_statuses: ${{ inputs.publish_commit_statuses }}
impact_mode: consume
env:
BASE_REF: ${{ inputs.base_ref }}
# Diagnostic PR #765 targets PR #764's head. Diff mutation testing
# against #764's original base so this run can isolate the suspected
# Linux allocator mutant with streamed resource telemetry.
BASE_REF: ec1f6bc2d289f73202665952aa8a1492d13c40c4

required-checks:
# This display name is the repository-ruleset context. Keep it stable
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4 changes: 1 addition & 3 deletions crates/rallocator/Cargo.toml
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Expand Up @@ -20,9 +20,6 @@ repository = "https://github.com/microsoft/oxidizer/tree/main/crates/rallocator"
[target.'cfg(target_os = "linux")'.dependencies]
libc.workspace = true

[target.'cfg(target_os = "linux")'.dev-dependencies]
mutants.workspace = true

[target.'cfg(loom)'.dev-dependencies]
loom.workspace = true

Expand Down Expand Up @@ -52,6 +49,7 @@ criterion.workspace = true
hashbrown = { workspace = true, features = ["default-hasher"] }
mimalloc.workspace = true
multitude = { path = "../multitude", default-features = false, features = ["hashbrown"] }
mutants.workspace = true
performables = { path = "../performables", features = ["seismograph"] }
seismograph = { path = "../seismograph", features = ["monitor"] }
seismograph_runtime = { path = "../seismograph_runtime" }
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1 change: 1 addition & 0 deletions crates/rallocator/src/allocator.rs
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Expand Up @@ -1944,6 +1944,7 @@
unsafe { flush_aggregate_batch(state) };
}

#[cfg_attr(test, mutants::skip)] // Bit-clearing mutants create an unbounded iterator and OOM Linux runners.
fn telemetry_used_slice_indices(bitmap: &[u64]) -> impl Iterator<Item = usize> + '_ {
bitmap.iter().enumerate().flat_map(|(word_index, &word)| {
let mut remaining = word;
Expand Down Expand Up @@ -3064,7 +3065,7 @@
return None;
}
find_free_slices_in(used, start, MEDIUM_REGION_SLICE_COUNT, count)
.or_else(|| find_free_slices_in(used, 0, start.saturating_add(count - 1).min(MEDIUM_REGION_SLICE_COUNT), count))

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (linux-arm)

Missed mutant 

 replace - with / in find_free_slices

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (linux-arm)

Missed mutant 

 replace - with + in find_free_slices

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (windows)

Missed mutant 

 replace - with / in find_free_slices

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (windows)

Missed mutant 

 replace - with + in find_free_slices

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (linux)

Missed mutant 

 replace - with / in find_free_slices

Check warning on line 3068 in crates/rallocator/src/allocator.rs

View workflow job for this annotation

GitHub Actions / PR Job / Check Group: Mutation Testing (linux)

Missed mutant 

 replace - with + in find_free_slices
}

fn find_free_slices_in(used: &[u64; MEDIUM_REGION_BITMAP_WORDS], start: usize, end: usize, count: usize) -> Option<usize> {
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