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wire 2026-07-15
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MATH.ROUND BUG CORRUPTS 5% OF INPUTS. EVENTPIPE LOSES HEAP DATA. SQLCLIENT GOES ASYNC

By RepoJournal · Filed · About .NET · Composed from the cited sources · methodology

by-msft tannergooding mdh1418 steveisok github-actions[bot] cheenamalhotra Pavel Savara
10 people shipped this
by-msft @by-msft 3 cited tannergooding @tannergooding 1 cited mdh1418 @mdh1418 1 cited steveisok @steveisok 1 cited github-actions[bot] @github-actions[bot] 1 cited cheenamalhotra @cheenamalhotra 1 cited Pavel Savara @pavelsavara jakobbotsch @jakobbotsch renovate @renovate paulmedynski @paulmedynski

Runtime shipped a critical fix for Math.Round that was silently mangling roughly 5% of all rounding operations across the BCL, while EventPipe's data loss is finally getting a blocking mode to save your GC dumps.

Math.Round(double, digits, mode) and MathF.Round(float, digits, mode) were computing an intermediate multiplication that lost precision, scaling values across rounding boundaries and silently corrupting results [1]. This affected the entire math stack. In parallel, EventPipe's lossy buffer design was dropping GC heap edges during large snapshots, corrupting dotnet-gcdump rebuilds; runtime now ships blocking mode to fix this [2]. SqlClient is shipping async counterparts for Always Encrypted key store providers, removing forced synchronous blocking during queries [5]. Separately, the SDK fixed P/Invoke profiler callbacks that were corrupting the shadow stack by firing spurious ELT events alongside transition callbacks [3]. Operator SDK hit v13.0.0 with breaking changes to leader election scoping and multi-assembly composition [4]. All three .NET LTS/current branches shipped patched builds: 8.0.29, 9.0.18, and 10.0.10 [6] [8] [7].

Action items

References

  1. [1] Fix incorrect rounding in Math.Round and MathF.Round with digits ↗ dotnet/runtime
  2. [2] [EventPipe] Add Blocking EventPipe Mode ↗ dotnet/runtime
  3. [3] Don't emit ELT callbacks for P/Invoke methods ↗ dotnet/runtime
  4. [4] v13.0.0 ↗ dotnet/dotnet-operator-sdk
  5. [5] Introduce Async API counterparts for AE base class ↗ dotnet/SqlClient
  6. [6] .NET 8.0.29 ↗ dotnet/efcore
  7. [7] .NET 10.0.10 ↗ dotnet/efcore
  8. [8] .NET 9.0.18 ↗ dotnet/efcore

$ ls dotnet/reviews/ # the step-back reads

the week in review CVE-2026-69304 hits ASP.NET Core; Spark 4.0 support lands the month in review F# interpolated strings and record spreads land as Orleans and runtime harden
Full archive → Weekly reviews →

Quick answers

What shipped in .NET on July 15, 2026?
Runtime shipped a critical fix for Math.Round that was silently mangling roughly 5% of all rounding operations across the BCL, while EventPipe's data loss is finally getting a blocking mode to save your GC dumps. In total, 34 commits, 37 pull requests, and 7 releases landed.
Who contributed to .NET on July 15, 2026?
10 developers shipped this update, including tannergooding, Pavel Savara, mdh1418, steveisok, jakobbotsch, github-actions[bot], renovate, and paulmedynski, and 2 more.
What were the notable .NET updates?
Fix incorrect rounding in Math.Round and MathF.Round with digits, [EventPipe] Add Blocking EventPipe Mode, and Don't emit ELT callbacks for P/Invoke methods.
♥

$ log @dotnet --recent

Vector literals stop breaking under comma-decimal cultures, AIDL one-way proxies generate correctly 83 shipped Spark 4.0 lands in .NET bindings, arcade refreshes Entra tokens mid-job 23 shipped MSBuild TaskAnalyzer quiets three diagnostics, Terminal Logger stops corrupting shared log events 20 shipped MAUI backports iOS regression coverage, aspnetcore bumps extensions 6 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training GSM8K scoring parses answers as exact decimals AI Red Teaming PyRIT closes a judge-spoofing hole, promptfoo accepts Langfuse v6

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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