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cmd/compile: internal compiler error in KeepAlive #17710

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dsnet opened this issue Oct 31, 2016 · 1 comment
Closed

cmd/compile: internal compiler error in KeepAlive #17710

dsnet opened this issue Oct 31, 2016 · 1 comment
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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Go1.8

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@dsnet
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dsnet commented Oct 31, 2016

ca4089a (issue: #15843, CL: http://golang.org/cl/28310) causes an internal when KeepAlive is applied on an interface.

Minimal reproduction:

package foo

import "runtime"

func f(x interface{}) {
	runtime.KeepAlive(x)
}

Prints (on amd64 on Linux Mint 17.1):

./foo.go:6: internal compiler error: KeepAlive with non-zero offset spill location x:8

goroutine 1 [running]:
runtime/debug.Stack(0x0, 0x0, 0x0)
	/home/rawr/Projects/go/src/runtime/debug/stack.go:24 +0x79
cmd/compile/internal/gc.Fatalf(0xa69a7e, 0x33, 0xc4203d4740, 0x2, 0x2)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/subr.go:165 +0x226
cmd/compile/internal/gc.(*ssaExport).Fatalf(0xd4f935, 0x6, 0xa69a7e, 0x33, 0xc4203d4740, 0x2, 0x2)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/ssa.go:4614 +0x5d
cmd/compile/internal/ssa.(*Config).Fatalf(0xc4203e4000, 0xc400000006, 0xa69a7e, 0x33, 0xc4203d4740, 0x2, 0x2)
	/home/rawr/Projects/go/src/cmd/compile/internal/ssa/config.go:319 +0x6e
cmd/compile/internal/ssa.(*Value).Fatalf(0xc4203e43c0, 0xa69a7e, 0x33, 0xc4203d4740, 0x2, 0x2)
	/home/rawr/Projects/go/src/cmd/compile/internal/ssa/value.go:235 +0x6f
cmd/compile/internal/gc.KeepAlive(0xc4203e43c0)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/ssa.go:4372 +0x18e
cmd/compile/internal/amd64.ssaGenValue(0xc4203abf40, 0xc4203e43c0)
	/home/rawr/Projects/go/src/cmd/compile/internal/amd64/ssa.go:864 +0x5c04
cmd/compile/internal/gc.genssa(0xc4203da240, 0xc4200ac238, 0xc4203dc930, 0xc4203dc9a0)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/ssa.go:4075 +0x25e
cmd/compile/internal/gc.compile(0xc4203d6750)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/pgen.go:433 +0x6e3
cmd/compile/internal/gc.funccompile(0xc4203d6750)
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/dcl.go:1292 +0xdc
cmd/compile/internal/gc.Main()
	/home/rawr/Projects/go/src/cmd/compile/internal/gc/main.go:469 +0x202c
main.main()
	/home/rawr/Projects/go/src/cmd/compile/main.go:47 +0x15d

\cc @randall77 @dr2chase
@dsnet dsnet added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 31, 2016
@dsnet dsnet added this to the Go1.8 milestone Oct 31, 2016
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CL https://golang.org/cl/32477 mentions this issue.

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