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cmd/compile: infinite loop in -G=3 type instantiation #48030

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reusee opened this issue Aug 28, 2021 · 2 comments
Closed

cmd/compile: infinite loop in -G=3 type instantiation #48030

reusee opened this issue Aug 28, 2021 · 2 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.18

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@reusee
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reusee commented Aug 28, 2021 •
edited

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

$ go version
go version devel go1.18-ef4cb2f776 Sat Aug 28 01:26:53 2021 +0000 windows/amd64

Does this issue reproduce with the latest release?

no

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

go env Output
$ go env
set GO111MODULE=
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\reus\AppData\Local\go-build
set GOENV=C:\Users\reus\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\reus\go\pkg\mod
set GONOPROXY=github.com/reusee/*
set GONOSUMDB=github.com/reusee/*
set GOOS=windows
set GOPATH=C:\Users\reus\go
set GOPRIVATE=github.com/reusee/*
set GOPROXY=https://goproxy.cn,direct
set GOROOT=C:\Users\reus\gotip
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\Users\reus\gotip\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=devel go1.18-ef4cb2f776 Sat Aug 28 01:26:53 2021 +0000
set GCCGO=gccgo
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=NUL
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\reus\AppData\Local\Temp\go-build2762099682=/tmp/go-build -gno-record-gcc-switches
GOROOT/bin/go version: go version devel go1.18-ef4cb2f776 Sat Aug 28 01:26:53 2021 +0000 windows/amd64
GOROOT/bin/go tool compile -V: compile version devel go1.18-ef4cb2f776 Sat Aug 28 01:26:53 2021 +0000

What did you do?

package main

type Src[T any] func() Src[T]

func Seq[T any]() Src[T] {
        return nil
}

func main() {
        Seq[int]()
}

What did you expect to see?

compile OK

What did you see instead?

# command-line-arguments
runtime: goroutine stack exceeds 1000000000-byte limit
runtime: sp=0xc020461440 stack=[0xc020460000, 0xc040460000]
fatal error: stack overflow

runtime stack:
runtime.throw({0x181c274, 0x1e1ee80})
        C:/Users/reus/gotip/src/runtime/panic.go:965 +0x76
runtime.newstack()
        C:/Users/reus/gotip/src/runtime/stack.go:1085 +0x5cc
runtime.morestack()
        C:/Users/reus/gotip/src/runtime/asm_amd64.s:422 +0x93

goroutine 1 [running]:
cmd/compile/internal/typecheck.(*Tsubster).typ1(0xc04045efb0, 0xc000405420)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1014 +0x13e8 fp=0xc020461450 sp=0xc020461448 pc=0x1145f28
cmd/compile/internal/typecheck.(*Tsubster).tstruct(0xc04045efb0, 0xc0004056c0, 0x0)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1280 +0x15c fp=0xc0204614f0 sp=0xc020461450 pc=0x114609c
cmd/compile/internal/typecheck.(*Tsubster).typ1(0xc04045efb0, 0xc000405420)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1131 +0x1ad fp=0xc0204616f8 sp=0xc0204614f0 pc=0x1144ced
cmd/compile/internal/typecheck.(*Tsubster).tstruct(0xc04045efb0, 0xc0004056c0, 0x0)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1280 +0x15c fp=0xc020461798 sp=0xc0204616f8 pc=0x114609c
cmd/compile/internal/typecheck.(*Tsubster).typ1(0xc04045efb0, 0xc000405420)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1131 +0x1ad fp=0xc0204619a0 sp=0xc020461798 pc=0x1144ced
cmd/compile/internal/typecheck.(*Tsubster).tstruct(0xc04045efb0, 0xc0004056c0, 0x0)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1280 +0x15c fp=0xc020461a40 sp=0xc0204619a0 pc=0x114609c
cmd/compile/internal/typecheck.(*Tsubster).typ1(0xc04045efb0, 0xc000405420)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1131 +0x1ad fp=0xc020461c48 sp=0xc020461a40 pc=0x1144ced
cmd/compile/internal/typecheck.(*Tsubster).tstruct(0xc04045efb0, 0xc0004056c0, 0x0)
        C:/Users/reus/gotip/src/cmd/compile/internal/typecheck/subr.go:1280 +0x15c fp=0xc020461ce8 sp=0xc020461c48 pc=0x114609c
cmd/compile/internal/typecheck.(*Tsubster).typ1(0xc04045efb0, 0xc000405420)

@danscales
@cuonglm
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cuonglm commented Aug 28, 2021

This works with GOEXPERIMENT=unified, cc @danscales @randall77

@danscales danscales self-assigned this Aug 28, 2021
@mdempsky mdempsky changed the title cmd/compile: infinite loop in type checker cmd/compile: infinite loop in -G=3 type instantiation Aug 29, 2021
@mdempsky mdempsky added the NeedsFix The path to resolution is known, but the work has not been done. label Aug 29, 2021
@mdempsky mdempsky added this to the Go1.18 milestone Aug 29, 2021
@gopherbot
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Change https://golang.org/cl/346229 mentions this issue: cmd/compile: fix bug with Inferred targs

@golang golang locked and limited conversation to collaborators Jun 23, 2023
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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