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cmd/trace: GC appears to start 25 days earlier than trace started, in UI only #73962

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cmd/trace: GC appears to start 25 days earlier than trace started, in UI only#73962
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BugReportIssues describing a possible bug in the Go implementation.NeedsFixThe path to resolution is known, but the work has not been done.compiler/runtimeIssues related to the Go compiler and/or runtime.
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Go1.25
@mknyszek

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@mknyszek
mknyszek
opened on Jun 3, 2025

@prattmic recently noticed in a trace that begin tracing during the GC cycle that the concurrent mark phase appears to start 25 days before the trace started.

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This is due to a bug in cmd/trace -- it wasn't updated to deal with a Sync event appearing at the start of the trace.

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    BugReportIssues describing a possible bug in the Go implementation.NeedsFixThe path to resolution is known, but the work has not been done.compiler/runtimeIssues related to the Go compiler and/or runtime.

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