Records/golang/golang.org/x/sync/failure issue

Where it was measured

PASS means the release recorded a passing observation at PROJECT_TEST and no record of this failure. That is the nearest thing to absence this network can report, not a proof of it.

• v0.23.0 not measured
• v0.22.0 FAIL
• v0.21.0 PASS 6 passing observations
• v0.20.0 FAIL
• v0.19.0 PASS 1 passing observations
• v0.17.0 PASS 7 passing observations
• v0.12.0 PASS 21 passing observations

Where it reproduced

• os=windows · runtime=go@1.26 ×8 2026-08-17 → 2026-08-17

Nearest known PASS/FAIL boundaries

The two adjacent releases the verdict changes across. Releases nothing measured do not close the gap; they are counted instead.

• Last passing release v0.19.0 → first failing release v0.20.0

  One side of this boundary has no resolved dependency tree, so nothing could be compared.

• Last failing release v0.20.0 → first passing release v0.21.0

  Both trees resolved every dependency to the same version. Nothing here moved.

• Last passing release v0.21.0 → first failing release v0.22.0

  Both trees resolved every dependency to the same version. Nothing here moved.

Evidence gaps

• The evidence for this failure was not preserved, so it has no established cause. Its stored hash is provenance, not an identity.
• Releases in this window never measured at PROJECT_TEST: 1
• No resolved dependency tree for v0.19.0 or for v0.20.0, so the versions either side of the boundary could not be compared.
• No failure domain was inferred for this failure.

Published answers for the affected releases

• golang.org/x/sync v0.22.0: syncmap.Map Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWgolang.org/x/sync/syncmap.Map MIT-0 · 2026-08-27
• golang.org/x/sync v0.22.0: errgroup.WithContext, errgroup.Group.SetLimit, semaphore.NewWeighted Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWerrgroup.WithContexterrgroup.Group.SetLimitsemaphore.NewWeightedsingleflight.Group MIT-0 · 2026-08-20
• golang.org/x/sync v0.20.0: errgroup.Group, errgroup.WithContext, singleflight.Group Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOWerrgroup.Grouperrgroup.WithContextsingleflight.Groupsemaphore.Weightedgo 1.26 MIT-0 · 2026-08-20
• golang.org/x/sync v0.20.0 Built ? This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. HOW MIT-0 · 2026-08-19