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cmd/compile: GOEXPERIMENT=preemptibleloops sometimes fails ssa/check #20675

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dr2chase opened this issue Jun 14, 2017 · 1 comment

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commented Jun 14, 2017

Please answer these questions before submitting your issue. Thanks!

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

1.almost9

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

amd64

What did you do?

GOEXPERIMENT=preemptibleloops ./make.bash
GOEXPERIMENT=preemptibleloops GO_GCFLAGS=-d=ssa/check/on ./run.bash

It fails like so:

crypto/tls/key_agreement.go:193:44: internal compiler error: inconsistent memory phi v1009 = Phi <mem> v71 v963 1 v963 v962

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/runtime/debug/stack.go:24 +0xa7
cmd/compile/internal/gc.Fatalf(0x176fcbb, 0x3f, 0xc422c70460, 0x7, 0x7)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/subr.go:181 +0x230
cmd/compile/internal/gc.(*ssafn).Fatalf(0xc4218d2960, 0x2b30200000bb8, 0x176fcbb, 0x3f, 0xc422c70460, 0x7, 0x7)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/ssa.go:5041 +0x67
cmd/compile/internal/ssa.(*Func).Fatalf(0xc4230bfb80, 0x176fcbb, 0x3f, 0xc422c70460, 0x7, 0x7)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/ssa/func.go:500 +0x78
cmd/compile/internal/ssa.memCheck(0xc4230bfb80)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/ssa/check.go:418 +0xcc1
cmd/compile/internal/ssa.checkFunc(0xc4230bfb80)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/ssa/check.go:317 +0xbef
cmd/compile/internal/ssa.Compile(0xc4230bfb80)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/ssa/compile.go:110 +0x395
cmd/compile/internal/gc.buildssa(0xc420f0d8c0, 0x0, 0x0)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/ssa.go:213 +0x881
cmd/compile/internal/gc.compileSSA(0xc420f0d8c0, 0x0)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/pgen.go:240 +0x3c
cmd/compile/internal/gc.compile(0xc420f0d8c0)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/pgen.go:219 +0x218
cmd/compile/internal/gc.funccompile(0xc420f0d8c0)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/dcl.go:1049 +0xb7
cmd/compile/internal/gc.Main(0x1772b48)
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/internal/gc/main.go:582 +0x2839
main.main()
	/Users/drchase/GoogleDrive/work/go-ssa2/src/cmd/compile/main.go:49 +0x95

@dr2chase dr2chase self-assigned this Jun 14, 2017

@bradfitz bradfitz added this to the Go1.9Maybe milestone Jun 14, 2017

@bradfitz bradfitz added the NeedsFix label Jun 14, 2017

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commented Jun 14, 2017

CL https://golang.org/cl/45791 mentions this issue.

@gopherbot gopherbot closed this in 9664bc1 Jul 14, 2017

@mikioh mikioh changed the title GOEXPERIMENT=preemptibleloops sometimes fails ssa/check cmd/compile: GOEXPERIMENT=preemptibleloops sometimes fails ssa/check Jul 21, 2017

@golang golang locked and limited conversation to collaborators Jul 21, 2018

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