x/tools/go/packages: nil pointer dereference

[bryancua]

Go version

go version go1.23.1 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOOS='darwin'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.23.1'
GODEBUG=''
GOTELEMETRY='local'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
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/lr/ftztsqk12fv4y1q5l4zy82700000gn/T/go-build3998064584=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

Ran the following program:

package main

import (
	. "golang.org/x/tools/go/packages"
)

func main() {
	cfg := &Config{
		Mode: NeedName | NeedFiles | NeedCompiledGoFiles | NeedImports | NeedTypes | NeedTypesSizes | NeedSyntax |
			NeedTypesInfo | NeedDeps,
	}

	// Load the files.
	pkgs, err := Load(cfg, "flag")
	if err != nil {
		panic(err)
	}
	if PrintErrors(pkgs) > 0 {
		panic(err)
	}
}

What did you see happen?

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=0x102957f14]

goroutine 106 [running]:
go/types.(*Checker).handleBailout(0x140001fb500, 0x140001cfbb8)
        /usr/local/go/src/go/types/check.go:404 +0x9c
panic({0x102a402c0?, 0x102bca540?})
        /usr/local/go/src/runtime/panic.go:785 +0x124
go/types.(*StdSizes).Sizeof(0x0, {0x102a7d8c8, 0x102bcd360})
        /usr/local/go/src/go/types/sizes.go:229 +0x314
go/types.(*Config).sizeof(...)
        /usr/local/go/src/go/types/sizes.go:334
go/types.representableConst.func1({0x102a7d8c8?, 0x102bcd360?})
        /usr/local/go/src/go/types/const.go:77 +0x90
go/types.representableConst({0x102a7f390, 0x102bc2f00}, 0x140001fb500, 0x102bcd360, 0x140001ce9d8)
        /usr/local/go/src/go/types/const.go:93 +0x134
go/types.(*Checker).representation(0x140001fb500, 0x140001eb480, 0x102bcd360)
        /usr/local/go/src/go/types/const.go:257 +0x68
go/types.(*Checker).implicitTypeAndValue(0x140001fb500, 0x140001eb480, {0x102a7d8c8, 0x102bcd360})
        /usr/local/go/src/go/types/expr.go:377 +0x304
go/types.(*Checker).convertUntyped(0x140001fb500, 0x140001eb480, {0x102a7d8c8, 0x102bcd360})
        /usr/local/go/src/go/types/const.go:290 +0x30
go/types.(*Checker).matchTypes(0x140001fb500, 0x140001eb440, 0x140001eb480)
        /usr/local/go/src/go/types/expr.go:928 +0x7c
go/types.(*Checker).binary(0x140001fb500, 0x140001eb440, {0x102a7e500, 0x140001b1a40}, {0x102a7e5c0, 0x140001e72e0}, {0x102a7eb00, 0x140001e7300}, 0x28, 0x71c2)
        /usr/local/go/src/go/types/expr.go:802 +0x114
go/types.(*Checker).exprInternal(0x140001fb500, 0x0, 0x140001eb440, {0x102a7e500, 0x140001b1a40}, {0x0, 0x0})
        /usr/local/go/src/go/types/expr.go:1452 +0x1d4
go/types.(*Checker).rawExpr(0x140001fb500, 0x0, 0x140001eb440, {0x102a7e500?, 0x140001b1a40?}, {0x0?, 0x0?}, 0x0)
        /usr/local/go/src/go/types/expr.go:981 +0x120
go/types.(*Checker).expr(0x140001fb500, 0x102a7dc60?, 0x140001eb440, {0x102a7e500?, 0x140001b1a40?})
        /usr/local/go/src/go/types/expr.go:1549 +0x38
go/types.(*Checker).stmt(0x140001fb500, 0x0, {0x102a7e920, 0x140001ea700})
        /usr/local/go/src/go/types/stmt.go:579 +0xa3c
go/types.(*Checker).stmtList(0x140001fb500, 0x0, {0x140001e7460?, 0x140001fb500?, 0x3?})
        /usr/local/go/src/go/types/stmt.go:121 +0x88
go/types.(*Checker).funcBody(0x140001fb500, 0x102a7e5c0?, {0x140001927a8?, 0x102a81458?}, 0x140001eb180, 0x140001b1ad0, {0x0?, 0x0?})
        /usr/local/go/src/go/types/stmt.go:41 +0x218
go/types.(*Checker).funcDecl.func1()
        /usr/local/go/src/go/types/decl.go:888 +0x44
go/types.(*Checker).processDelayed(0x140001fb500, 0x0)
        /usr/local/go/src/go/types/check.go:516 +0x12c
go/types.(*Checker).checkFiles(0x140001fb500, {0x1400018e1b8, 0x1, 0x1})
        /usr/local/go/src/go/types/check.go:462 +0x1b4
go/types.(*Checker).Files(0x140000f4000?, {0x1400018e1b8?, 0x140001a0780?, 0x6?})
        /usr/local/go/src/go/types/check.go:422 +0x80
golang.org/x/tools/go/packages.(*loader).loadPackage(0x140000f4000, 0x140000758f0)
        /***/golang.org/x/tools@v0.9.1/go/packages/packages.go:1052 +0x858
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1()
        /***/golang.org/x/tools@v0.9.1/go/packages/packages.go:851 +0x178
sync.(*Once).doSlow(0x0?, 0x0?)
        /usr/local/go/src/sync/once.go:76 +0xf8
sync.(*Once).Do(...)
        /usr/local/go/src/sync/once.go:67
golang.org/x/tools/go/packages.(*loader).loadRecursive(0x0?, 0x0?)
        /***/golang.org/x/tools@v0.9.1/go/packages/packages.go:839 +0x48
golang.org/x/tools/go/packages.(*loader).loadRecursive.func1.1(0x0?)
        /***/golang.org/x/tools@v0.9.1/go/packages/packages.go:846 +0x30
created by golang.org/x/tools/go/packages.(*loader).loadRecursive.func1 in goroutine 8
        /***/golang.org/x/tools@v0.9.1/go/packages/packages.go:845 +0x84

What did you expect to see?

Exit code 0

The code runs properly on 1.22

[gabyhelp]

Related Issues and Documentation

• cmd/go: panic: runtime error: invalid memory address or nil pointer dereference during type checking in `go generate` #66670 (closed)
• x/tools/go/packages: panic loading with LoadTypes #31163 (closed)
• go/types: nil pointer dereference in go/types.(*StdSizes).Sizeof #62167 (closed)
• go/types: SIGSEGV in (*Checker).exprInternal #37602
• cmd/compile: nil pointer dereference #47892 (closed)
• cmd/go: panic when building a `main` package in GOPATH mode when a go.work file exists #58767 (closed)
• x/tools/go/packages: panic in go/types during (*loader).refine #33936 (closed)
• cmd/compile: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference #51335 (closed)
• text/template: panics encountered during function calls are hard to treat and debug #28242 (closed)
• GO 1.17 crashes when trying to compile a program #48126 (closed)

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[findleyr]

What is your version of x/tools? This looks like #62167.

[bryancua]

Thanks. I should have checked that first.