x/build/internal/task: "Mail update stdlib index CL for 1.20" task panic

[mknyszek]

This is the failure I see:

In text, "Mail update stdlib index CL for 1.20" fails with "task interrupted before completion." Retrying doesn't help, and it's currently blocking announcements (@dmitshur informed me that this should be a leaf task).

CC @golang/release @golang/tools-team

[dmitshur]

This is related to #54377.

[gopherbot]

Change https://go.dev/cl/464535 mentions this issue: internal/task: skip CreateUpdateStdlibIndexCL

[findleyr]

Is there an easy way to skip this step?

Edit: (Aha, LGTM)

[mknyszek]

I scrapped the CL because the issue caused the whole workflow to fail, so we probably can't resume. @dmitshur thinks this is probably unrecoverable. I'll have to do the announcements manually.

[dmitshur]

Relevant stack trace to help with the investigation of the problem in CreateUpdateStdlibIndexCL:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xfedc1c]

goroutine 354024 [running]:
golang.org/x/build/internal/task.(*VersionTasks).CreateUpdateStdlibIndexCL(0xc000a75080, 0xc0006f59a0, {0xc00118e030?, 0xc00118e060?}, {0xc000704000, 0x2, 0x4}, {0xc001061650?, 0x4c4a1e?})
	/app/internal/task/version.go:149 +0x7c
reflect.Value.call({0x1191980?, 0xc000854ed0?, 0x60?}, {0x135a4d1, 0x4}, {0xc001088e40, 0x4, 0x18?})
	/usr/local/go/src/reflect/value.go:556 +0x845
reflect.Value.Call({0x1191980?, 0xc000854ed0?, 0xc0005df380?}, {0xc001088e40, 0x4, 0x4})
	/usr/local/go/src/reflect/value.go:339 +0xbf
golang.org/x/build/internal/workflow.runTask({0x1601f08?, 0xc0009adb40?}, {0xc1, 0x76, 0x62, 0x66, 0xa1, 0xac, 0x49, 0xd3, ...}, ...)
	/app/internal/workflow/workflow.go:845 +0x41c
golang.org/x/build/internal/workflow.(*Workflow).Run.func2()
	/app/internal/workflow/workflow.go:763 +0xbe
created by golang.org/x/build/internal/workflow.(*Workflow).Run
	/app/internal/workflow/workflow.go:763 +0xeef

Looks like the VersionTasks.LatestGoBinaries field is unset.

[gopherbot]

Change https://go.dev/cl/464815 mentions this issue: cmd/relui: fix up goimports regeneration task, add one-off workflow