cmd/go: panic: runtime error: invalid memory address or nil pointer dereference during type checking in go generate

[pgavlin]

Go version

go version go1.22.2 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/pgavlin/Library/Caches/go-build'
GOENV='/Users/pgavlin/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/pgavlin/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/pgavlin/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.22.2'
GCCGO='gccgo'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/Users/pgavlin/dev/dawn/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/5s/zjjxx0nn25n9485s6tr_llxh0000gn/T/go-build3994936334=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Ran go generate ./... from the module root. The module is https://github.com/pgavlin/dawn.

What did you see happen?

dawn ❯ go generate ./...
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1008499d4]

goroutine 36 [running]:
go/types.(*Checker).handleBailout(0x14000d42600, 0x14001033c38)
	/usr/local/go/src/go/types/check.go:367 +0x9c
panic({0x100961d00?, 0x100b55100?})
	/usr/local/go/src/runtime/panic.go:770 +0x124
go/types.(*StdSizes).Sizeof(0x0, {0x1009ab680, 0x100b586c0})
	/usr/local/go/src/go/types/sizes.go:228 +0x314
go/types.(*Config).sizeof(...)
	/usr/local/go/src/go/types/sizes.go:333
go/types.representableConst.func1({0x1009ab680?, 0x100b586c0?})
	/usr/local/go/src/go/types/const.go:76 +0x9c
go/types.representableConst({0x1009ad380, 0x100b4c560}, 0x14000d42600, 0x100b586c0, 0x1400108b3e8)
	/usr/local/go/src/go/types/const.go:92 +0x138
go/types.(*Checker).conversion.func1({0x1009aad20?, 0x14000f860e0?}, 0x1400108b3e8)
	/usr/local/go/src/go/types/conversions.go:24 +0x74
go/types.(*Checker).conversion(0x14000d42600, 0x1400108b3c0, {0x1009aad20, 0x14000f860e0})
	/usr/local/go/src/go/types/conversions.go:44 +0x18c
go/types.(*Checker).callExpr(0x14000d42600, 0x1400108b3c0, 0x14000af68c0)
	/usr/local/go/src/go/types/call.go:224 +0xa54
go/types.(*Checker).exprInternal(0x14000d42600, 0x0, 0x1400108b3c0, {0x1009ac9c8, 0x14000af68c0}, {0x0, 0x0})
	/usr/local/go/src/go/types/expr.go:1374 +0xd0
go/types.(*Checker).rawExpr(0x14000d42600, 0x0, 0x1400108b3c0, {0x1009ac9c8?, 0x14000af68c0?}, {0x0?, 0x0?}, 0x0)
	/usr/local/go/src/go/types/expr.go:979 +0x12c
go/types.(*Checker).expr(0x14000d42600, 0x0?, 0x1400108b3c0, {0x1009ac9c8?, 0x14000af68c0?})
	/usr/local/go/src/go/types/expr.go:1513 +0x38
go/types.(*Checker).varDecl(0x14000d42600, 0x14000aa1140, {0x14000d046d8, 0x1, 0x1}, {0x0, 0x0}, {0x1009ac9c8, 0x14000af68c0})
	/usr/local/go/src/go/types/decl.go:521 +0x140
go/types.(*Checker).objDecl(0x14000d42600, {0x1009b0678, 0x14000aa1140}, 0x0)
	/usr/local/go/src/go/types/decl.go:194 +0x7ec
go/types.(*Checker).packageObjects(0x14000d42600)
	/usr/local/go/src/go/types/resolver.go:693 +0x468
go/types.(*Checker).checkFiles(0x14000d42600, {0x140004e5500, 0xf, 0xf})
	/usr/local/go/src/go/types/check.go:408 +0x164
go/types.(*Checker).Files(...)
	/usr/local/go/src/go/types/check.go:372
golang.org/x/tools/go/packages.(*loader).loadPackage(0x14000148000, 0x140004d3160)
	/Users/pgavlin/go/pkg/mod/golang.org/x/[email protected]/go/packages/packages.go:1001 +0x624
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1()
	/Users/pgavlin/go/pkg/mod/golang.org/x/[email protected]/go/packages/packages.go:838 +0x178
sync.(*Once).doSlow(0x10065feb0?, 0x1400023a360?)
	/usr/local/go/src/sync/once.go:74 +0x100
sync.(*Once).Do(...)
	/usr/local/go/src/sync/once.go:65
golang.org/x/tools/go/packages.(*loader).loadRecursive(0x0?, 0x1006c7154?)
	/Users/pgavlin/go/pkg/mod/golang.org/x/[email protected]/go/packages/packages.go:826 +0x50
golang.org/x/tools/go/packages.(*loader).refine.func2(0x0?)
	/Users/pgavlin/go/pkg/mod/golang.org/x/[email protected]/go/packages/packages.go:761 +0x30
created by golang.org/x/tools/go/packages.(*loader).refine in goroutine 1
	/Users/pgavlin/go/pkg/mod/golang.org/x/[email protected]/go/packages/packages.go:760 +0xa80
exit status 2
project_builtins.go:1: running "go": exit status 1

What did you expect to see?

I expected go generate to complete successfully.

This frame seems to indicate that the receiver of (*StdSizes).Sizeof is nil:

go/types.(*StdSizes).Sizeof(0x0, {0x1009ab680, 0x100b586c0})
	/usr/local/go/src/go/types/sizes.go:228 +0x314

Not sure how that might happen ¯_(ツ)_/¯

[seankhliao]

That's a problem of the command you run, e.g. ./cmd/dawn-gen-builtins, not of go itself.

[pgavlin]

That's a problem of the command you run, e.g. ./cmd/dawn-gen-builtins, not of go itself.

To close the loop--I needed to update golang.org/x/tools.

[gopherbot]

Change https://go.dev/cl/577455 mentions this issue: go/types: fix incorrect non-nil check causing panic