Golang internal/runtime/gc/scan:racebench: BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go failures [consistent failure]

#!watchflakes
default <- pkg == "internal/runtime/gc/scan:racebench" && test == "BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go"

Issue created automatically to collect these failures.

Example (log):

=== RUN   BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go
BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go
BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go-4                   4180251            28.68 ns/op

— watchflakes

Comment From: gopherbot

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/runtime/gc/scan:racebench" && test == "BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go"

2025-08-12 18:23 gotip-linux-arm64-race go@889ab741 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

=== RUN BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go-4 4180251 28.68 ns/op

2025-08-12 18:42 gotip-linux-arm64-race go@f67d8ff3 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

2025-08-12 18:42 gotip-linux-arm64-race go@8e317da7 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

2025-08-12 18:42 gotip-linux-arm64-race go@f63e12d0 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

2025-08-12 18:42 gotip-linux-arm64-race go@d2b3c1a5 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

— watchflakes

Comment From: gopherbot

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/runtime/gc/scan:racebench" && test == "BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go"

2025-08-12 18:41 gotip-linux-arm64-race go@750789fa internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

2025-08-12 18:42 gotip-linux-arm64-race go@fe4d445c internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

2025-08-12 18:42 gotip-darwin-arm64-race go@d2b3c1a5 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

— watchflakes

Comment From: gopherbot

Change https://go.dev/cl/695476 mentions this issue: internal/runtime/gc/scan: avoid -1 index when cache sizes unavailable

Comment From: gopherbot

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/runtime/gc/scan:racebench" && test == "BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go"

2025-08-12 18:42 gotip-darwin-arm64-race go@8e317da7 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

— watchflakes

Comment From: gopherbot

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "internal/runtime/gc/scan:racebench" && test == "BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go"

2025-08-12 23:04 gotip-linux-arm64-race go@4e182db5 internal/runtime/gc/scan:racebench.BenchmarkScanSpanPacked/cache=tiny/pages=1/sizeclass=1/pct=0/impl=Go [SKIP] (log)

— watchflakes