cmd/compile: internal compiler error: unexpected Interface for <nil> while building Kubernetes

[sudeeshjohn]

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

$ go version
go version devel +4a91d55 Wed Feb 27 04:34:51 2019 +0000 linux/ppc64le

Does this issue reproduce with the latest release?

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

go env Output

$ go env
GOARCH="ppc64le"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="ppc64le"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/go/containerd_ws"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_ppc64le"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build637435105=/tmp/go-build -gno-record-gcc-switches"

What did you do?

git clone https://github.com/kubernetes/kubernetes.git
make all

What did you expect to see?

build should be successful

What did you see instead?

+++ [0227 10:25:19] Building go targets for linux/ppc64le:
    ./vendor/k8s.io/code-generator/cmd/deepcopy-gen
+++ [0227 10:25:28] Building go targets for linux/ppc64le:
    ./vendor/k8s.io/code-generator/cmd/defaulter-gen
+++ [0227 10:25:34] Building go targets for linux/ppc64le:
    ./vendor/k8s.io/code-generator/cmd/conversion-gen
+++ [0227 10:25:46] Building go targets for linux/ppc64le:
    ./vendor/k8s.io/kube-openapi/cmd/openapi-gen
2019/02/27 10:25:54 Code for OpenAPI definitions generated
+++ [0227 10:25:55] Building go targets for linux/ppc64le:
    ./vendor/github.com/jteeuwen/go-bindata/go-bindata
+++ [0227 10:25:56] Building go targets for linux/ppc64le:
    cmd/kube-proxy
    cmd/kube-apiserver
    cmd/kube-controller-manager
    cmd/cloud-controller-manager
    cmd/kubelet
    cmd/kubeadm
    cmd/hyperkube
    cmd/kube-scheduler
    vendor/k8s.io/apiextensions-apiserver
    cluster/gce/gci/mounter
    cmd/kubectl
    cmd/gendocs
    cmd/genkubedocs
    cmd/genman
    cmd/genyaml
    cmd/genswaggertypedocs
    cmd/linkcheck
    vendor/github.com/onsi/ginkgo/ginkgo
    test/e2e/e2e.test
    cmd/kubemark
    vendor/github.com/onsi/ginkgo/ginkgo
    test/e2e_node/e2e_node.test
# k8s.io/kubernetes/vendor/k8s.io/apiextensions-apiserver
/usr/local/go/pkg/tool/linux_ppc64le/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory

# k8s.io/kubernetes/cmd/kubelet
/usr/local/go/pkg/tool/linux_ppc64le/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory

# k8s.io/kubernetes/cmd/genyaml
/usr/local/go/pkg/tool/linux_ppc64le/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory

# k8s.io/kubernetes/cmd/hyperkube
fatal error: runtime: out of memory

runtime stack:
runtime.throw(0x279be3, 0x16)
	/usr/local/go/src/runtime/panic.go:627 +0x5c
runtime.sysMap(0xc068000000, 0x8000000, 0x466a18)
	/usr/local/go/src/runtime/mem_linux.go:170 +0xcc
runtime.(*mheap).sysAlloc(0x448d20, 0x6e80000, 0x448d30, 0x3740)
	/usr/local/go/src/runtime/malloc.go:633 +0x194
runtime.(*mheap).grow(0x448d20, 0x3740, 0x0)
	/usr/local/go/src/runtime/mheap.go:1232 +0x3c
runtime.(*mheap).allocSpanLocked(0x448d20, 0x3740, 0x466a28, 0xc000000100)
	/usr/local/go/src/runtime/mheap.go:1150 +0x3fc
runtime.(*mheap).alloc_m(0x448d20, 0x3740, 0x320100, 0x448d28)
	/usr/local/go/src/runtime/mheap.go:977 +0xb0
runtime.(*mheap).alloc.func1()
	/usr/local/go/src/runtime/mheap.go:1048 +0x4c
runtime.systemstack(0xc000863ee8)
	/usr/local/go/src/runtime/asm_ppc64x.s:286 +0xd4
runtime.(*mheap).alloc(0x448d20, 0x3740, 0x10100, 0x3fff774100d8)
	/usr/local/go/src/runtime/mheap.go:1047 +0x7c
runtime.largeAlloc(0x6e80000, 0x230001, 0x3fff73270ab8)
	/usr/local/go/src/runtime/malloc.go:1055 +0x94
runtime.mallocgc.func1()
	/usr/local/go/src/runtime/malloc.go:950 +0x48
runtime.systemstack(0x40500)
	/usr/local/go/src/runtime/asm_ppc64x.s:260 +0x94
runtime.mstart()
	/usr/local/go/src/runtime/proc.go:1153

goroutine 1 [running]:
runtime.systemstack_switch()
	/usr/local/go/src/runtime/asm_ppc64x.s:207 +0x10 fp=0xc000822698 sp=0xc000822678 pc=0x66ca0
runtime.mallocgc(0x6e80000, 0x24ba80, 0xc06461e401, 0x271a02)
	/usr/local/go/src/runtime/malloc.go:949 +0x868 fp=0xc000822758 sp=0xc000822698 pc=0x1af28
runtime.newarray(0x24ba80, 0x88000, 0xae)
	/usr/local/go/src/runtime/malloc.go:1085 +0x88 fp=0xc000822798 sp=0xc000822758 pc=0x1b348
runtime.makeBucketArray(0x230e20, 0x13, 0x0, 0xc06461e460, 0xc06461e460)
	/usr/local/go/src/runtime/map.go:364 +0x1b4 fp=0xc0008227e0 sp=0xc000822798 pc=0x1c394
runtime.hashGrow(0x230e20, 0xc0000846f0)
	/usr/local/go/src/runtime/map.go:1035 +0x9c fp=0xc000822840 sp=0xc0008227e0 pc=0x1e0dc
runtime.mapassign_faststr(0x230e20, 0xc0000846f0, 0xc06461e460, 0xd5, 0x4665e0)
	/usr/local/go/src/runtime/map_faststr.go:272 +0x138 fp=0xc0008228b8 sp=0xc000822840 pc=0x21978
cmd/link/internal/sym.(*Symbols).Lookup(0xc00008e0f0, 0xc06461e460, 0xd5, 0x0, 0xc0644663a0)
	/usr/local/go/src/cmd/link/internal/sym/symbols.go:79 +0x160 fp=0xc000822948 sp=0xc0008228b8 pc=0xfb3c0
cmd/link/internal/objfile.(*objReader).readRef(0xc000822cd0)
	/usr/local/go/src/cmd/link/internal/objfile/objfile.go:395 +0xc8 fp=0xc000822a40 sp=0xc000822948 pc=0x131a48
cmd/link/internal/objfile.(*objReader).loadObjFile(0xc000822cd0)
	/usr/local/go/src/cmd/link/internal/objfile/objfile.go:110 +0x26c fp=0xc000822be8 sp=0xc000822a40 pc=0x12f4dc
cmd/link/internal/objfile.Load(0x434d80, 0xc00008e0f0, 0xc017353760, 0xc03d0c9e10, 0x16709, 0xc0645f1b80, 0x97)
	/usr/local/go/src/cmd/link/internal/objfile/objfile.go:70 +0x18c fp=0xc000822de8 sp=0xc000822be8 pc=0x12f0dc
cmd/link/internal/ld.ldobj(0xc0006ac000, 0xc017353760, 0xc03d0c9e10, 0x16797, 0xc0645f1b80, 0x97, 0xc00075c49d, 0x8f, 0x0)
	/usr/local/go/src/cmd/link/internal/ld/lib.go:1659 +0x96c fp=0xc000822f98 sp=0xc000822de8 pc=0x1883fc
cmd/link/internal/ld.loadobjfile(0xc0006ac000, 0xc03d0c9e10)
	/usr/local/go/src/cmd/link/internal/ld/lib.go:889 +0x380 fp=0xc000823140 sp=0xc000822f98 pc=0x182230
cmd/link/internal/ld.(*Link).loadlib(0xc0006ac000)
	/usr/local/go/src/cmd/link/internal/ld/lib.go:381 +0x170 fp=0xc000823350 sp=0xc000823140 pc=0x17ef20
cmd/link/internal/ld.Main(0x434d80, 0x10, 0x20, 0x1, 0x1, 0x41, 0x2763cb, 0x10, 0x271c44, 0x3, ...)
	/usr/local/go/src/cmd/link/internal/ld/main.go:207 +0xb24 fp=0xc0008234d0 sp=0xc000823350 pc=0x197804
main.main()
	/usr/local/go/src/cmd/link/main.go:65 +0x238 fp=0xc000823f68 sp=0xc0008234d0 pc=0x1f66e8
runtime.main()
	/usr/local/go/src/runtime/proc.go:200 +0x24c fp=0xc000823fc0 sp=0xc000823f68 pc=0x3d58c
runtime.goexit()
	/usr/local/go/src/runtime/asm_ppc64x.s:857 +0x4 fp=0xc000823fc0 sp=0xc000823fc0 pc=0x69224
/usr/local/go/pkg/tool/linux_ppc64le/link: signal: killed
/usr/local/go/pkg/tool/linux_ppc64le/link: signal: killed
# k8s.io/kubernetes/cmd/kubemark
/usr/local/go/pkg/tool/linux_ppc64le/link: running gcc failed: fork/exec /usr/bin/gcc: cannot allocate memory

!!! [0227 10:29:56] Call tree:
!!! [0227 10:29:56]  1: /go/containerd_ws/src/github.com/k8s.io/kubernetes/hack/lib/golang.sh:624 kube::golang::build_some_binaries(...)
!!! [0227 10:29:56]  2: /go/containerd_ws/src/github.com/k8s.io/kubernetes/hack/lib/golang.sh:758 kube::golang::build_binaries_for_platform(...)
!!! [0227 10:29:56]  3: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
!!! [0227 10:29:56] Call tree:
!!! [0227 10:29:56]  1: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
!!! [0227 10:29:56] Call tree:
!!! [0227 10:29:56]  1: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
Makefile:92: recipe for target 'all' failed
make: *** [all] Error 1

looks like the commit 6fa7669 introduced the issue.

[agnivade]

/cc @laboger @ceseo

[sudeeshjohn]

My bad, unfortunately the error log I pasted is different, pasting the right log:

+++ [0227 18:36:44] Building go targets for linux/ppc64le:
    cmd/kube-proxy
    cmd/kube-apiserver
    cmd/kube-controller-manager
    cmd/cloud-controller-manager
    cmd/kubelet
    cmd/kubeadm
    cmd/hyperkube
    cmd/kube-scheduler
    vendor/k8s.io/apiextensions-apiserver
    cluster/gce/gci/mounter
    cmd/kubectl
    cmd/gendocs
    cmd/genkubedocs
    cmd/genman
    cmd/genyaml
    cmd/genswaggertypedocs
    cmd/linkcheck
    vendor/github.com/onsi/ginkgo/ginkgo
    test/e2e/e2e.test
    cmd/kubemark
    vendor/github.com/onsi/ginkgo/ginkgo
    test/e2e_node/e2e_node.test
# k8s.io/kubernetes/test/e2e/storage
test/e2e/storage/pd.go:203:86: internal compiler error: unexpected Interface for <nil>

goroutine 1 [running]:
runtime/debug.Stack(0xb03f40, 0xc0001cc008, 0x0)
	/go/src/golang/go/src/runtime/debug/stack.go:24 +0x8c
cmd/compile/internal/gc.Fatalf(0x94c976, 0x1b, 0xc001965e90, 0x1, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/subr.go:190 +0x29c
cmd/compile/internal/gc.Val.Interface(0x0, 0x0, 0x0, 0x8a98a0)
	/go/src/golang/go/src/cmd/compile/internal/gc/const.go:98 +0x28c
cmd/compile/internal/gc.(*constSet).add(0xc001966130, 0xc001615590, 0x93cc26)
	/go/src/golang/go/src/cmd/compile/internal/gc/const.go:1477 +0x120
cmd/compile/internal/gc.typecheckcomplit(0xc001622a80, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:3089 +0xbac
cmd/compile/internal/gc.typecheck1(0xc001622a80, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:902 +0x4538
cmd/compile/internal/gc.typecheck(0xc001622a80, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc0007e6a40, 0x4, 0x4, 0x2)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheck1(0xc001622980, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3628
cmd/compile/internal/gc.typecheck(0xc001622980, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc0001d6940, 0x6, 0x8, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheck1(0xc001622280, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:2148 +0xa49c
cmd/compile/internal/gc.typecheck(0xc001622280, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc000b1c200, 0x23, 0x40, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheckclosure(0xc000fbb340, 0x2)
	/go/src/golang/go/src/cmd/compile/internal/gc/closure.go:111 +0x21c
cmd/compile/internal/gc.typecheck1(0xc000fbb340, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:2017 +0x40e8
cmd/compile/internal/gc.typecheck(0xc000fbb340, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc000a29540, 0x2, 0x2, 0x2)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheck1(0xc001612780, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3628
cmd/compile/internal/gc.typecheck(0xc001612780, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc0004e76e0, 0x4, 0x4, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheckrange(0xc001612180)
	/go/src/golang/go/src/cmd/compile/internal/gc/range.go:36 +0xf4
cmd/compile/internal/gc.typecheck1(0xc001612180, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:2181 +0xa690
cmd/compile/internal/gc.typecheck(0xc001612180, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc0001d6600, 0x7, 0x8, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheckclosure(0xc000fbb080, 0x2)
	/go/src/golang/go/src/cmd/compile/internal/gc/closure.go:111 +0x21c
cmd/compile/internal/gc.typecheck1(0xc000fbb080, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:2017 +0x40e8
cmd/compile/internal/gc.typecheck(0xc000fbb080, 0x2, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc000a29580, 0x2, 0x2, 0x2)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.typecheck1(0xc000f36600, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3628
cmd/compile/internal/gc.typecheck(0xc000f36600, 0x1, 0x0)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6a0
cmd/compile/internal/gc.typecheckslice(0xc001610000, 0x14, 0x1c, 0x1)
	/go/src/golang/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x64
cmd/compile/internal/gc.Main(0x962028)
	/go/src/golang/go/src/cmd/compile/internal/gc/main.go:545 +0x2c88
main.main()
	/go/src/golang/go/src/cmd/compile/main.go:51 +0xbc

!!! [0227 18:38:11] Call tree:
!!! [0227 18:38:11]  1: /go/src/k8s.io/kubernetes/hack/lib/golang.sh:758 kube::golang::build_binaries_for_platform(...)
!!! [0227 18:38:11]  2: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
!!! [0227 18:38:11] Call tree:
!!! [0227 18:38:11]  1: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
!!! [0227 18:38:11] Call tree:
!!! [0227 18:38:11]  1: hack/make-rules/build.sh:27 kube::golang::build_binaries(...)
Makefile:92: recipe for target 'all' failed
make: *** [all] Error 1

[mkumatag]

This seems like happening in latest code got merged in the golang via 6fa7669
CL: https://go-review.googlesource.com/c/152544

[mkumatag]

@mdempsky @bradfitz ^^

[bradfitz]

I can reproduce this on linux/amd64. It's not ppc64x-specific.

bradfitz@gdev:~/go/src$ go version
go version devel +43732816be Wed Feb 27 15:08:01 2019 +0000 linux/amd64

bradfitz@gdev:~/go/src$ go get -d -u k8s.io/kubernetes/test/e2e/storage 

bradfitz@gdev:~/src/k8s.io/kubernetes$ git show-ref HEAD
b2e9b2a842b72d3a19ad7e540d0589dd84722d2a refs/remotes/origin/HEAD

bradfitz@gdev:~/go/src$ go install k8s.io/kubernetes/test/e2e/storage 
# k8s.io/kubernetes/test/e2e/storage 
../../src/k8s.io/kubernetes/test/e2e/storage/pd.go:203:86: internal compiler error: unexpected Interface for <nil> 
 
goroutine 1 [running]: 
runtime/debug.Stack(0xf84980, 0xc00000e018, 0x0) 
        /home/bradfitz/go/src/runtime/debug/stack.go:24 +0x9d 
cmd/compile/internal/gc.Fatalf(0xde10d3, 0x1b, 0xc001c4a558, 0x1, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/subr.go:190 +0x293 
cmd/compile/internal/gc.Val.Interface(0x0, 0x0, 0xc000038380, 0x7f6d4ce326d0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/const.go:98 +0x27e 
cmd/compile/internal/gc.(*constSet).add(0xc001c4a7b0, 0xc001189590, 0xdd133c) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/const.go:1477 +0x109 
cmd/compile/internal/gc.typecheckcomplit(0xc00118ea00, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:3089 +0xbf2 
cmd/compile/internal/gc.typecheck1(0xc00118ea00, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:902 +0x46f8 
cmd/compile/internal/gc.typecheck(0xc00118ea00, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc0006e6de0, 0x4, 0x4, 0x2) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheck1(0xc00118e900, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3759 
cmd/compile/internal/gc.typecheck(0xc00118e900, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc0002e6340, 0x6, 0x8, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheck1(0xc00118e200, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:2148 +0xac27 
cmd/compile/internal/gc.typecheck(0xc00118e200, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc0002fe800, 0x23, 0x40, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheckclosure(0xc000b05340, 0x2) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/closure.go:111 +0x2da 
cmd/compile/internal/gc.typecheck1(0xc000b05340, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:2017 +0x42d5 
cmd/compile/internal/gc.typecheck(0xc000b05340, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc000609860, 0x2, 0x2, 0x2) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheck1(0xc001186700, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3759 
cmd/compile/internal/gc.typecheck(0xc001186700, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc0006fbb20, 0x4, 0x4, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheckrange(0xc001186100) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/range.go:36 +0x11e 
cmd/compile/internal/gc.typecheck1(0xc001186100, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:2181 +0xadbc 
cmd/compile/internal/gc.typecheck(0xc001186100, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc0005737c0, 0x7, 0x8, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheckclosure(0xc000b05080, 0x2) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/closure.go:111 +0x2da 
cmd/compile/internal/gc.typecheck1(0xc000b05080, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:2017 +0x42d5 
cmd/compile/internal/gc.typecheck(0xc000b05080, 0x2, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc000609870, 0x2, 0x2, 0x2) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.typecheck1(0xc000a41880, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:1324 +0x3759 
cmd/compile/internal/gc.typecheck(0xc000a41880, 0x1, 0x0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:298 +0x6f2 
cmd/compile/internal/gc.typecheckslice(0xc001184000, 0x14, 0x1c, 0x1) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/typecheck.go:116 +0x50 
cmd/compile/internal/gc.Main(0xdf62f0) 
        /home/bradfitz/go/src/cmd/compile/internal/gc/main.go:545 +0x2a54 
main.main() 
        /home/bradfitz/go/src/cmd/compile/main.go:51 +0xad