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wire 2026-09-04
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$ the-wire · showcase

macOS signal handling crash fix, On-Demand Resources for simulator

By RepoJournal · Filed · About .NET

Rolf Bjarne Kvinge Larry Ewing jtschuster Joey Robichaud dotnet-maestro dotnet-maestro[bot] AndyAyersMS
10 people shipped this
Rolf Bjarne Kvinge @rolfbjarne 1 cited Larry Ewing @lewing 1 cited jtschuster @jtschuster 1 cited Joey Robichaud @JoeRobich 1 cited dotnet-maestro @dotnet-maestro dotnet-maestro[bot] @dotnet-maestro[bot] AndyAyersMS @AndyAyersMS davidwengier @davidwengier dibarbet @dibarbet akhera99 @akhera99

The .NET runtime fixes a macOS crash when stale signal flags call SIG_IGN or SIG_DFL, and Mac Catalyst apps can now load on-demand resources in the simulator.

The runtime now guards against a macOS crash that occurred when a process exec'd dotnet with a signal handler installed. macOS preserves sa_flags across execve, leaving SA_SIGINFO set even when the handler is cleared to SIG_IGN or SIG_DFL; the runtime previously called the stale pointer and crashed. It now checks for SIG_IGN and SIG_DFL before invoking the previous handler, with a regression test added. [1]

Mac iOS developers get a fix for on-demand resources (ODR) in the simulator. The build previously wrote asset packs next to the app bundle with an AssetPackManifestTemplate.plist pointing at http://127.0.0.1, which only works on device where the IDE hosts them. Since the simulator has no hosting server, NSBundleResourceRequest failed at runtime with "No manifest found for bundleID". The fix embeds the packs in the app bundle for the simulator. [2]

Meanwhile, the Wasm CoreCLR runtime adds a browser test leg with readyToRun: true, crossgen2-compiling merged runners so wasm JIT regressions are actually exercised instead of relying on per-test workarounds. [3] The Roslyn SDK now publishes Windows PDBs for five VSIX assemblies, fixing missing symbols in the legacy VS insertion symbol store. [4]

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

the week in review Native AOT debug info overhaul the month in review F# interpolated strings and record spreads land as Orleans and runtime harden
Topics: .NET Full archive →

Quick answers

What shipped in .NET on September 4, 2026?
The .NET runtime fixes a macOS crash when stale signal flags call SIG_IGN or SIG_DFL, and Mac Catalyst apps can now load on-demand resources in the simulator. In total, 61 commits and 62 pull requests landed.
Who contributed to .NET on September 4, 2026?
10 developers shipped this update, including Rolf Bjarne Kvinge, dotnet-maestro, dotnet-maestro[bot], Larry Ewing, AndyAyersMS, jtschuster, davidwengier, and dibarbet, and 2 more.
What were the notable .NET updates?
Check for SIG_IGN and SIG_DFL before calling previous signal handler, [msbuild] Embed on-demand resource asset packs in the app bundle for the simulator. Fixes #26218 (#26481), and Run browser wasm runtime tests with ReadyToRun (#133134).
♥

$ log @dotnet --recent

Spark 4.0 daemon workers and RDD execution land 19 shipped Orleans hardens grain directory and storage providers against null inputs 50 shipped WebAssembly runtime fixes narrow long-local reads; F# strips dead feature flags 97 shipped NativeAOT drops libc++, R8 obfuscation gains primitives 70 shipped

$ log --all # elsewhere on the wire

Meta React Native adds Stable API guards to renderer attributed string FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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