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build: intermittent CS0006 on the ubuntu CI leg (App.Shared ref assembly), root cause unproven

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#352 0 bình luận 0 reaction 0 người được giao Xem trên GitHub

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Đánh giá

Độ khó
5/5
Thời gian dự kiến
Hơn một tuần
Mức phù hợp với người mới
25/100
Loại issue
Lỗi
Độ rõ ràng
Khá rõ ràng
Mức độ hoạt động
Sôi nổi
Công nghệ
android, csharp
Lĩnh vực
build-system, ci-cd

Hướng nghiên cứu

Start with the Ubuntu Build step in the CI workflow and the Android multi-RID build settings; the issue identifies _AndroidBuildRuntimeIdentifiersInParallel as an untested candidate. First capture a failing binlog using repeated builds with fresh obj/ and bin/ directories, uploading the log on failure. Done means the intermittent CS0006 root cause is established and a fix is supported by evidence; the issue notes that no failing binlog has yet been captured.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.

Mô tả

help wanted

Summary

The ubuntu-latest CI leg intermittently fails its Build step with:

CSC : error CS0006: Metadata file
  '/home/runner/work/lagebuch/lagebuch/src/LageBuch.App.Shared/obj/Release/net10.0/ref/LageBuch.App.Shared.dll'
  could not be found [/home/runner/work/lagebuch/lagebuch/src/LageBuch.App/LageBuch.App.csproj]

Seen once in ~25 runs surveyed (≈4%, single observation so the real rate could be ~1–10%): run 34987088319, attempt 1, the ubuntu leg of #327. A plain re-run cleared it with no code change.

Surfaced while fixing #326. Deliberately not fixed — see "Impact" for why this is filed rather than patched.

Impact (why this is low priority)

context builds App + App.Android in one MSBuild invocation? exposed
ubuntu CI leg (dotnet build LageBuch.sln) yes only here
windows CI leg no (Desktop.slnf excludes the Android head) no
release.yml windows/linux/macos jobs no (dotnet publish src/LageBuch.App/…, own runner) no
release.yml android job no (dotnet publish src/LageBuch.App.Android/…, own runner) no
make build / make ci no (desktop projects only) no
make build-all / make test-all yes yes (needs JDK ≤ 21)

Releases are structurally safe: each platform publishes a single project in its own job on its own runner, so LageBuch.App's csc and the Android inner build never run in the same invocation.

The failure is fail-stop, not corruption — the build dies, Test is skipped, no artifact is produced. It cannot ship a bad binary. The real cost is signal erosion: an intermittent red that is always "just re-run it" trains people to re-run reds without reading them.

Evidence gathered

Two MSBuild binlogs captured by temporarily adding -bl: plus a pinned actions/upload-artifact to the ubuntu leg, then replayed headlessly:

dotnet msbuild build.binlog -noconlog -flp:"logfile=diag.txt;verbosity=diagnostic"
  • baseline (main @ 9a0de65, no fix): run 35018637663
  • attempted fix (Directory.Build.targets): run 35017414253
❌ Hypothesis DISPROVEN — do not redo this

"Microsoft.Android.Sdk.AssemblyResolution.targets → _ResolveAssemblies re-invokes the Android head per RID with extra global properties; those flow down ProjectReference edges, giving LageBuch.App.Shared two MSBuild configurations writing the same obj/."

The SDK part is real — _ResolveAssemblies does inject _ComputeFilesToPublishForRuntimeIdentifiers, SkipCompilerExecution, _OuterOutputPath etc., once per RID (android-arm64;android-x64). But the conclusion does not follow. Both binlogs show exactly one configuration id per project:

baseline: App.Shared=11  AppLogic=6  Domain=9  Persistence=2  Sync=8
fixed:    App.Shared=10  AppLogic=7  Domain=9  Persistence=2  Sync=11

RuntimeIdentifier/SelfContained are stripped for RID-agnostic references and TargetFramework for single-TFM ones (Microsoft.Common.CurrentVersion.targets, _GetProjectReferenceTargetFrameworkProperties), so there is no second configuration to race. Leaked global properties are not the differentiator.

✅ What the evidence does support

The two RID inner builds each request the same configuration's default targets, and the scheduler can place them on different nodes — identically with and without the attempted fix:

project baseline attempted fix
App.Shared cfg 11:22 node 4, 11:24 node 4 cfg 10:22 node 4, 10:24 node 1
AppLogic cfg 6:42 node 3, 6:45 node 3 cfg 7:42 node 3, 7:44 node 1
Domain cfg 9:89 node 4, 9:94 node 1 cfg 9:82 node 2, 9:91 node 1
Persistence cfg 2:56 / 2:58 node 3 cfg 2:52 node 4, 2:54 node 1
Sync cfg 8:56 / 8:58 node 4 cfg 11:53 / 11:54 node 2

So the hazard is two concurrent builds of one configuration against one obj/ directory, not two configurations. Consistent with the error being CS0006 ("could not be found", i.e. a genuine unlink) rather than CS0009 — the only Delete in range is IncrementalClean, which reads and rewrites the shared …csproj.FileListAbsolute.txt. Not confirmed: no failing binlog was captured, only passing ones.

Unexplained residue

The attempted fix measurably halved the duplicated work for the two direct references — App.Shared went from two CopyFilesToOutputDirectory executions (TaskId 396, 792) to one (TaskId 397), AppLogic likewise — while Domain/Persistence/Sync still run twice. Why undefining properties changed anything, given the configuration was already single, is not explained. That is why it was not merged: "it helped and I don't know why" is not a rationale for a build-system change.

Next candidate (untested)

_AndroidBuildRuntimeIdentifiersInParallel=false — serialises the two RID inner builds so their reference-graph requests cannot overlap. An earlier analysis dismissed this on the reasoning that both inner builds collapse onto the same configuration and so serialising removes no contention; given the above, that reasoning looks exactly backwards — the contention is between those two.

Other options, with the caveat that several are symptom-level: build the Android head in its own sequential CI step; -m:1 on the ubuntu build (slow); ProduceReferenceAssembly=false (likely relocates CS0006 to CS0009 — not recommended).

To capture a failing binlog

Frequency is low, so loop the build inside one step with a fresh obj/+bin/ per iteration and upload on failure only. 15 iterations ≈ 46% chance of catching it, 30 ≈ 70%.

Revisit if

  • the rate climbs past roughly 1 in 10
  • a second project starts referencing the Android head
  • the ubuntu leg ever becomes release-blocking

The attempted fix is preserved in #330 (closed, with a correction comment).

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C#
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