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cmd/compile: internal compiler error: missing import reader for sync.(*RWMutex).RLock #48454

dominikh opened this issue Sep 18, 2021 · 2 comments


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@dominikh dominikh commented Sep 18, 2021

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

$ go version
go version devel go1.18-4b654c0eec Fri Sep 17 23:44:10 2021 +0000 linux/amd64

What did you do?

mkdir scratch
cd scratch
curl | txtar -x
go build ./cmd/demo

Note that the bug only reproduces when building ./cmd/demo. It does not trigger when building either the top-level package or the container package.

What did you see instead?

/tmp/bar/container/container.go:10:15: internal compiler error: missing import reader for sync.(*RWMutex).RLock

goroutine 1 [running]:
	/home/dominikh/prj/go/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0xd5d71fff, 0x7f6a}, {0xceae44, 0x1c}, {0xc00058d3c0, 0x1, 0x1})
	/home/dominikh/prj/go/src/cmd/compile/internal/base/print.go:227 +0x154
	/home/dominikh/prj/go/src/cmd/compile/internal/typecheck/iimport.go:73 +0x1b9
	/home/dominikh/prj/go/src/cmd/compile/internal/typecheck/func.go:169 +0xad
cmd/compile/internal/inline.oldInline(0xc0001457a0, 0xc00011e9a0, 0x0)
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:785 +0x53
cmd/compile/internal/inline.mkinlcall(0xc0001457a0, 0xc00011e9a0, 0x5b6402, 0xc000115590, 0xc000128fa0)
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:737 +0xc85
cmd/compile/internal/inline.inlnode({0xe482f8, 0xc0001457a0}, 0x20, 0x30, 0x7f6afc6a35b8)
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:594 +0x4e5
cmd/compile/internal/inline.InlineCalls.func1({0xe482f8, 0xc0001457a0})
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:513 +0x31
cmd/compile/internal/ir.editNodes({0xc00011c4c0, 0x1, 0x203000}, 0xc000128fa0)
	/home/dominikh/prj/go/src/cmd/compile/internal/ir/node_gen.go:1521 +0x74
cmd/compile/internal/ir.(*Func).editChildren(0xc00058dad8, 0x5b9607)
	/home/dominikh/prj/go/src/cmd/compile/internal/ir/func.go:153 +0x2e
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:515 +0xf2
cmd/compile/internal/inline.InlinePackage.func1({0xc000118340, 0x1, 0xc00011f340}, 0x0)
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:71 +0x46
cmd/compile/internal/ir.(*bottomUpVisitor).visit(0xc000115470, 0xc00011f340)
	/home/dominikh/prj/go/src/cmd/compile/internal/ir/scc.go:127 +0x2f0
cmd/compile/internal/ir.VisitFuncsBottomUp({0xc00012aac0, 0x4, 0xb}, 0xd07570)
	/home/dominikh/prj/go/src/cmd/compile/internal/ir/scc.go:60 +0x105
	/home/dominikh/prj/go/src/cmd/compile/internal/inline/inl.go:58 +0x33
	/home/dominikh/prj/go/src/cmd/compile/internal/gc/main.go:246 +0xc7d
	/home/dominikh/prj/go/src/cmd/compile/main.go:55 +0xdd
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@dominikh dominikh commented Sep 18, 2021

Bisects to

commit 80783558b06741beaf41dbd198013fe3a13c9ad2
Author: Dan Scales <>
Date:   Mon Sep 6 16:25:43 2021 -0700

    cmd/compile: make sure imported instantiated types have their methods created
    We should be putting a newly instantiated imported type in
    Instantiate/doInst onto the instTypeList, so its methods/dictionaries
    are instantiated. To do this, we needed a more general way to add a
    type to instTypeList, so add NeedInstType(), analogous to
    NeedRuntimeType(). This has the extra advantage that now all types
    created by the type substituter are added to instTypeList without any
    extra code, which was easy to forget. doInst() now correctly calls
    This is a bit aggressive, since a fully instantiated type in a generic
    function/method may never be used, if the generic method is never
    instantiated in the local package. But it should be fairly uncommon for
    a generic method to mention a fully instantiated type (but it does
    happen in this bug).
    Fixes both cases mentioned in the bug.
    Fixed #48185

/cc @danscales


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@gopherbot gopherbot commented Sep 21, 2021

Change mentions this issue: cmd/compile: fix crawler for unexported fields with instantiated types


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