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cmd/compile: unaligned stores to global variables on s390x (causes SIGILL or relocation error) #21048

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mundaym opened this issue Jul 17, 2017 · 2 comments
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@mundaym
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@mundaym mundaym commented Jul 17, 2017

What version of Go are you using (go version)?

go1.9beta2 (also present in go1.8.3)

What operating system and processor architecture are you using (go env)?

linux/s390x

What did you do?

package main

type T struct {
	a [1]byte
	b [2]byte
}

var x T

//go:noinline
func newT() T {
	return T{[1]byte{1}, [2]byte{1,2}}
}

func main() {
	x.b = newT().b
}

(https://play.golang.org/p/jXSguFs4Hk)

What did you expect to see?

Successful execution.

What did you see instead?

main.main: main.x+1054942 is not 2-byte aligned

While not strictly a regression from the last release, this bug does cause the docker tests to fail when using go1.9beta2. I have a somewhat ugly fix, will send a CL shortly.

@mundaym mundaym added this to the Go1.9 milestone Jul 17, 2017
@mundaym mundaym self-assigned this Jul 17, 2017
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@gopherbot gopherbot commented Jul 17, 2017

CL https://golang.org/cl/49250 mentions this issue.

@bradfitz

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@bradfitz bradfitz commented Jul 18, 2017

If this was present in Go 1.8.x, it's not a candidate for holding up Go 1.9. Sorry. But if you get a safe fix out in the next 24-48 hours, maybe, depending on reviewer feedback.

We're already a couple weeks overdue releasing the Go 1.9rc1 due to other issues.

@bradfitz bradfitz modified the milestones: Go1.9Maybe, Go1.9 Jul 18, 2017
@bradfitz bradfitz added the NeedsFix label Jul 18, 2017
@gopherbot gopherbot closed this in 93b7eb9 Jul 19, 2017
@golang golang locked and limited conversation to collaborators Jul 19, 2018
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