[OpenTelemetry] Fix race initializing `AggregatorStore` on ARM64 by matt-hensley · Pull Request #7951 · open-telemetry/opentelemetry-dotnet

matt-hensley · 2026-10-15T14:32:56Z

Changes

Marks the initialization flags in AggregatorStore as volatile for correctness on ARM64.

The flags use double-checked locking: the metric point is written under a lock, then the flag is set.

Without volatile, ARM64 can make the flag visible before the metric point write finishes. A thread recording the first measurement with no tags, or the first overflow measurement, could then see the flag set and use a partially initialized metric point. x86/x64 is not affected.

x86/x64 guarantees that writes become visible in program order, and that reads are not reordered with other reads. The ARM64 memory model does not guarantee this behavior. Without volatile the flag can be read by other threads before the metric point write is visible.

This is a memory-model fix and I have not observed it in practice. The added test covers the concurrent first-write path, but it cannot detect this issue on x86/x64.

Merge requirement checklist

CONTRIBUTING guidelines followed (license requirements, successful build/tests, etc.)
Tests added/updated
CHANGELOG.md file(s) updated for non-trivial changes
Changes in public API reviewed (if applicable)
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opentelemetry-pr-dashboard · 2026-10-15T14:33:46Z

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Merged · refreshed 2026-10-16 10:24 UTC

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…att-hensley/opentelemetry-dotnet into matt-hensley/aggregator-volatile

codecov · 2026-10-15T15:10:54Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.30%. Comparing base (ec22a34) to head (75b9ab1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7951   +/-   ##
=======================================
  Coverage   92.30%   92.30%           
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  Files         363      363           
  Lines       21035    21035           
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  Hits        19416    19416           
  Misses       1619     1619

Flag	Coverage Δ
unittests-Project-Experimental	`92.42% <ø> (ø)`
unittests-Project-Stable	`92.42% <ø> (-0.01%)`	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/OpenTelemetry/Metrics/AggregatorStore.cs	`92.38% <ø> (-0.21%)`	⬇️

... and 1 file with indirect coverage changes

Copilot

🟢 Approval recommended

The focused volatile-publication fix includes concurrent-path coverage and a changelog entry, with no unresolved findings.

0 open findings

What changed in this PR

Fixes ARM64 memory-ordering risks when the metrics SDK initializes reserved metric points.

Changes:

Makes both initialization flags volatile.
Adds concurrent first-measurement coverage for untagged and overflow points.
Documents the fix in the SDK changelog.

File	Description
test/OpenTelemetry.Tests/Metrics/MetricPointReclaimTests.cs	Tests concurrent initialization of reserved points.
src/OpenTelemetry/Metrics/AggregatorStore.cs	Uses volatile flags to safely publish initialization.
src/OpenTelemetry/CHANGELOG.md	Records the ARM64 race fix.

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Pinned [OpenTelemetry.Extensions.Hosting](https://github.com/open-telemetry/opentelemetry-dotnet) at 1.20.1. <details> <summary>Release notes</summary> _Sourced from [OpenTelemetry.Extensions.Hosting's releases](https://github.com/open-telemetry/opentelemetry-dotnet/releases)._ ## 1.20.1 For highlights and announcements pertaining to this release see: [Release Notes > 1.20.1](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/RELEASENOTES.md#1201). The following changes are from the previous release [1.20.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.20.0). * NuGet: [OpenTelemetry v1.20.1](https://www.nuget.org/packages/OpenTelemetry/1.20.1) * Fixed a possible race condition on ARM64 when multiple threads record the first measurement with no tags, or the first overflow measurement, that could cause the measurement to be recorded incorrectly. ([#7951](open-telemetry/opentelemetry-dotnet#7951)) * Fixed self-diagnostics preamble redaction of quoted or encoded PEM material and prefixed JWTs. ([#7955](open-telemetry/opentelemetry-dotnet#7955)) * Fixed default HTTP client log filtering when registering the OTLP log exporter through `OpenTelemetryLoggerOptions`. ([#7959](open-telemetry/opentelemetry-dotnet#7959)) * Fixed legacy self-diagnostics logging terminating the process when the log file is truncated or the log volume runs out of space. ([#7956](open-telemetry/opentelemetry-dotnet#7956)) * **Experimental (pre-release builds only):** Fixed `Logger.EmitLog` ignoring instrumentation suppression, which could cause recursive exports or deadlocks. ([#7961](open-telemetry/opentelemetry-dotnet#7961)) * Fixed delta double counters losing subsequent measurements after a non-finite or large value and idle metric points with a `NaN` value failing to be reclaimed. ([#7963](open-telemetry/opentelemetry-dotnet#7963)) * Improve the assignment of values to exponential histogram buckets when the value is near a bucket boundary by using a pre-computed lookup table. ([#7911](open-telemetry/opentelemetry-dotnet#7911)) * Fixed `LogRecord`s being returned to the shared pool while still queued for export when an exporter stops enumerating a single-item or array `Batch<LogRecord>` early which could cause a `BatchLogRecordExportProcessor` on the same provider to export missing or incorrect data. ([#7965](open-telemetry/opentelemetry-dotnet#7965)) * Fixed a `SuppressInstrumentationScope.Enter()` reference count never being released when the `Activity` it was entered for is not recorded, which caused all subsequent telemetry in that execution context to be suppressed. ([#7966](open-telemetry/opentelemetry-dotnet#7966)) * Self-diagnostics log files, whether configured through `OTEL_DIAGNOSTICS.json` or `SelfDiagnosticsOptions`, are now always created as new files. ([#7968](open-telemetry/opentelemetry-dotnet#7968)) ... (truncated) ## 1.20.1-rc.1 The following changes are from the previous release [1.20.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.20.0). * NuGet: [OpenTelemetry v1.20.1-rc.1](https://www.nuget.org/packages/OpenTelemetry/1.20.1-rc.1) * Fixed a possible race condition on ARM64 when multiple threads record the first measurement with no tags, or the first overflow measurement, that could cause the measurement to be recorded incorrectly. ([#7951](open-telemetry/opentelemetry-dotnet#7951)) * Fixed self-diagnostics preamble redaction of quoted or encoded PEM material and prefixed JWTs. ([#7955](open-telemetry/opentelemetry-dotnet#7955)) * Fixed default HTTP client log filtering when registering the OTLP log exporter through `OpenTelemetryLoggerOptions`. ([#7959](open-telemetry/opentelemetry-dotnet#7959)) * Fixed legacy self-diagnostics logging terminating the process when the log file is truncated or the log volume runs out of space. ([#7956](open-telemetry/opentelemetry-dotnet#7956)) * **Experimental (pre-release builds only):** Fixed `Logger.EmitLog` ignoring instrumentation suppression, which could cause recursive exports or deadlocks. ([#7961](open-telemetry/opentelemetry-dotnet#7961)) * Fixed delta double counters losing subsequent measurements after a non-finite or large value and idle metric points with a `NaN` value failing to be reclaimed. ([#7963](open-telemetry/opentelemetry-dotnet#7963)) * Improve the assignment of values to exponential histogram buckets when the value is near a bucket boundary by using a pre-computed lookup table. ([#7911](open-telemetry/opentelemetry-dotnet#7911)) * Fixed `LogRecord`s being returned to the shared pool while still queued for export when an exporter stops enumerating a single-item or array `Batch<LogRecord>` early which could cause a `BatchLogRecordExportProcessor` on the same provider to export missing or incorrect data. ([#7965](open-telemetry/opentelemetry-dotnet#7965)) * Fixed a `SuppressInstrumentationScope.Enter()` reference count never being released when the `Activity` it was entered for is not recorded, which caused all subsequent telemetry in that execution context to be suppressed. ([#7966](open-telemetry/opentelemetry-dotnet#7966)) * Self-diagnostics log files, whether configured through `OTEL_DIAGNOSTICS.json` or `SelfDiagnosticsOptions`, are now always created as new files. ([#7968](open-telemetry/opentelemetry-dotnet#7968)) * Self-diagnostics messages written to the sinks configured by `SelfDiagnosticsOptions` are now truncated to 16,384 characters so that the ... (truncated) ## 1.20.1-beta.1 The following changes are from the previous release [1.20.0-beta.1](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/coreunstable-1.20.0-beta.1). * NuGet: [OpenTelemetry.Exporter.Prometheus.AspNetCore v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Exporter.Prometheus.AspNetCore/1.20.1-beta.1) * Fixed scrape responses being handed to the server in a single write, which made the server buffer a full copy of the response for each client that did not read it until the request completed or timed out. Responses are now written in bounded slices so the server's back-pressure applies. ([#7957](open-telemetry/opentelemetry-dotnet#7957)) * Fixed startup scrapes permanently omitting `target_info` and configured resource constant labels from subsequent scrape responses. ([#7984](open-telemetry/opentelemetry-dotnet#7984)) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md) for details. * NuGet: [OpenTelemetry.Exporter.Prometheus.HttpListener v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Exporter.Prometheus.HttpListener/1.20.1-beta.1) * Fixed scrape responses being handed to the server in a single write, which on Linux and macOS made the listener allocate and hold a full copy of the response for each client that did not read it until the request completed or timed out. Responses are now written in bounded slices. ([#7957](open-telemetry/opentelemetry-dotnet#7957)) * Fixed scrape requests that announce a request body holding a thread pool thread after their response had been sent on Linux and macOS for as long as the client kept trickling in the body. The connection is now closed after responding to a request with a body instead of being kept alive. ([#7962](open-telemetry/opentelemetry-dotnet#7962)) * Fixed startup scrapes permanently omitting `target_info` and configured resource constant labels from subsequent scrape responses. ([#7984](open-telemetry/opentelemetry-dotnet#7984)) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md) for details. * NuGet: [OpenTelemetry.Shims.OpenTracing v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Shims.OpenTracing/1.20.1-beta.1) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md) for details. Commits viewable in [compare view](open-telemetry/opentelemetry-dotnet@core-1.20.0...core-1.20.1). </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Updated [OpenTelemetry.Extensions.Hosting](https://github.com/open-telemetry/opentelemetry-dotnet) from 1.20.0 to 1.20.1. <details> <summary>Release notes</summary> _Sourced from [OpenTelemetry.Extensions.Hosting's releases](https://github.com/open-telemetry/opentelemetry-dotnet/releases)._ ## 1.20.1 For highlights and announcements pertaining to this release see: [Release Notes > 1.20.1](https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/RELEASENOTES.md#1201). The following changes are from the previous release [1.20.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.20.0). * NuGet: [OpenTelemetry v1.20.1](https://www.nuget.org/packages/OpenTelemetry/1.20.1) * Fixed a possible race condition on ARM64 when multiple threads record the first measurement with no tags, or the first overflow measurement, that could cause the measurement to be recorded incorrectly. ([#7951](open-telemetry/opentelemetry-dotnet#7951)) * Fixed self-diagnostics preamble redaction of quoted or encoded PEM material and prefixed JWTs. ([#7955](open-telemetry/opentelemetry-dotnet#7955)) * Fixed default HTTP client log filtering when registering the OTLP log exporter through `OpenTelemetryLoggerOptions`. ([#7959](open-telemetry/opentelemetry-dotnet#7959)) * Fixed legacy self-diagnostics logging terminating the process when the log file is truncated or the log volume runs out of space. ([#7956](open-telemetry/opentelemetry-dotnet#7956)) * **Experimental (pre-release builds only):** Fixed `Logger.EmitLog` ignoring instrumentation suppression, which could cause recursive exports or deadlocks. ([#7961](open-telemetry/opentelemetry-dotnet#7961)) * Fixed delta double counters losing subsequent measurements after a non-finite or large value and idle metric points with a `NaN` value failing to be reclaimed. ([#7963](open-telemetry/opentelemetry-dotnet#7963)) * Improve the assignment of values to exponential histogram buckets when the value is near a bucket boundary by using a pre-computed lookup table. ([#7911](open-telemetry/opentelemetry-dotnet#7911)) * Fixed `LogRecord`s being returned to the shared pool while still queued for export when an exporter stops enumerating a single-item or array `Batch<LogRecord>` early which could cause a `BatchLogRecordExportProcessor` on the same provider to export missing or incorrect data. ([#7965](open-telemetry/opentelemetry-dotnet#7965)) * Fixed a `SuppressInstrumentationScope.Enter()` reference count never being released when the `Activity` it was entered for is not recorded, which caused all subsequent telemetry in that execution context to be suppressed. ([#7966](open-telemetry/opentelemetry-dotnet#7966)) * Self-diagnostics log files, whether configured through `OTEL_DIAGNOSTICS.json` or `SelfDiagnosticsOptions`, are now always created as new files. ([#7968](open-telemetry/opentelemetry-dotnet#7968)) ... (truncated) ## 1.20.1-rc.1 The following changes are from the previous release [1.20.0](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/core-1.20.0). * NuGet: [OpenTelemetry v1.20.1-rc.1](https://www.nuget.org/packages/OpenTelemetry/1.20.1-rc.1) * Fixed a possible race condition on ARM64 when multiple threads record the first measurement with no tags, or the first overflow measurement, that could cause the measurement to be recorded incorrectly. ([#7951](open-telemetry/opentelemetry-dotnet#7951)) * Fixed self-diagnostics preamble redaction of quoted or encoded PEM material and prefixed JWTs. ([#7955](open-telemetry/opentelemetry-dotnet#7955)) * Fixed default HTTP client log filtering when registering the OTLP log exporter through `OpenTelemetryLoggerOptions`. ([#7959](open-telemetry/opentelemetry-dotnet#7959)) * Fixed legacy self-diagnostics logging terminating the process when the log file is truncated or the log volume runs out of space. ([#7956](open-telemetry/opentelemetry-dotnet#7956)) * **Experimental (pre-release builds only):** Fixed `Logger.EmitLog` ignoring instrumentation suppression, which could cause recursive exports or deadlocks. ([#7961](open-telemetry/opentelemetry-dotnet#7961)) * Fixed delta double counters losing subsequent measurements after a non-finite or large value and idle metric points with a `NaN` value failing to be reclaimed. ([#7963](open-telemetry/opentelemetry-dotnet#7963)) * Improve the assignment of values to exponential histogram buckets when the value is near a bucket boundary by using a pre-computed lookup table. ([#7911](open-telemetry/opentelemetry-dotnet#7911)) * Fixed `LogRecord`s being returned to the shared pool while still queued for export when an exporter stops enumerating a single-item or array `Batch<LogRecord>` early which could cause a `BatchLogRecordExportProcessor` on the same provider to export missing or incorrect data. ([#7965](open-telemetry/opentelemetry-dotnet#7965)) * Fixed a `SuppressInstrumentationScope.Enter()` reference count never being released when the `Activity` it was entered for is not recorded, which caused all subsequent telemetry in that execution context to be suppressed. ([#7966](open-telemetry/opentelemetry-dotnet#7966)) * Self-diagnostics log files, whether configured through `OTEL_DIAGNOSTICS.json` or `SelfDiagnosticsOptions`, are now always created as new files. ([#7968](open-telemetry/opentelemetry-dotnet#7968)) * Self-diagnostics messages written to the sinks configured by `SelfDiagnosticsOptions` are now truncated to 16,384 characters so that the ... (truncated) ## 1.20.1-beta.1 The following changes are from the previous release [1.20.0-beta.1](https://github.com/open-telemetry/opentelemetry-dotnet/releases/tag/coreunstable-1.20.0-beta.1). * NuGet: [OpenTelemetry.Exporter.Prometheus.AspNetCore v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Exporter.Prometheus.AspNetCore/1.20.1-beta.1) * Fixed scrape responses being handed to the server in a single write, which made the server buffer a full copy of the response for each client that did not read it until the request completed or timed out. Responses are now written in bounded slices so the server's back-pressure applies. ([#7957](open-telemetry/opentelemetry-dotnet#7957)) * Fixed startup scrapes permanently omitting `target_info` and configured resource constant labels from subsequent scrape responses. ([#7984](open-telemetry/opentelemetry-dotnet#7984)) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Exporter.Prometheus.AspNetCore/CHANGELOG.md) for details. * NuGet: [OpenTelemetry.Exporter.Prometheus.HttpListener v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Exporter.Prometheus.HttpListener/1.20.1-beta.1) * Fixed scrape responses being handed to the server in a single write, which on Linux and macOS made the listener allocate and hold a full copy of the response for each client that did not read it until the request completed or timed out. Responses are now written in bounded slices. ([#7957](open-telemetry/opentelemetry-dotnet#7957)) * Fixed scrape requests that announce a request body holding a thread pool thread after their response had been sent on Linux and macOS for as long as the client kept trickling in the body. The connection is now closed after responding to a request with a body instead of being kept alive. ([#7962](open-telemetry/opentelemetry-dotnet#7962)) * Fixed startup scrapes permanently omitting `target_info` and configured resource constant labels from subsequent scrape responses. ([#7984](open-telemetry/opentelemetry-dotnet#7984)) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Exporter.Prometheus.HttpListener/CHANGELOG.md) for details. * NuGet: [OpenTelemetry.Shims.OpenTracing v1.20.1-beta.1](https://www.nuget.org/packages/OpenTelemetry.Shims.OpenTracing/1.20.1-beta.1) * Updated OpenTelemetry core component version(s) to `1.20.1`. ([#7990](open-telemetry/opentelemetry-dotnet#7990)) See [CHANGELOG](https://github.com/open-telemetry/opentelemetry-dotnet/blob/coreunstable-1.20.1-beta.1/src/OpenTelemetry.Shims.OpenTracing/CHANGELOG.md) for details. Commits viewable in [compare view](open-telemetry/opentelemetry-dotnet@core-1.20.0...core-1.20.1). </details> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=OpenTelemetry.Extensions.Hosting&package-manager=nuget&previous-version=1.20.0&new-version=1.20.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. 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matt-hensley and others added 2 commits October 15, 2026 10:15

mark volatile for arm64

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Merge branch 'main' into matt-hensley/aggregator-volatile

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Pull Request Dashboard #7539

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matt-hensley added 3 commits October 15, 2026 10:57

ci fix

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Merge branch 'matt-hensley/aggregator-volatile' of ssh://github.com/m…

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…att-hensley/opentelemetry-dotnet into matt-hensley/aggregator-volatile

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matt-hensley marked this pull request as ready for review October 16, 2026 09:32

Merge branch 'main' into matt-hensley/aggregator-volatile

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Merged via the queue into open-telemetry:main with commit 737e973 Oct 16, 2026
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Bump the dotnet-minor group with 10 updates steven-moriasi/mobility-finance-event-platform#19

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[OpenTelemetry] Fix race initializing `AggregatorStore` on ARM64 - #7951

[OpenTelemetry] Fix race initializing `AggregatorStore` on ARM64#7951
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