}
}

func TestPanicSystemstack(t *testing.T) {
	// Test that GOTRACEBACK=crash prints both the system and user
	// stack of other threads.

	// The GOTRACEBACK=crash handler takes 0.1 seconds even if
	// it's not writing a core file and potentially much longer if
	// it is. Skip in short mode.
	if testing.Short() {
		t.Skip("Skipping in short mode (GOTRACEBACK=crash is slow)")
	}

// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime_test

// This test of GOTRACEBACK=system has its own file,
// to minimize line-number perturbation.

import (
	"bytes"
	"fmt"
	"internal/testenv"
	"io"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"runtime/debug"
	"strconv"
	"strings"

		// from breaking tests that are trying to parse other command output.
		if strings.HasPrefix(env, "GODEBUG=") {
			continue
		}
		// Exclude GOTRACEBACK for the same reason.
		if strings.HasPrefix(env, "GOTRACEBACK=") {
			continue
		}
		cmd.Env = append(cmd.Env, env)
	}
	return cmd
}

// CommandContext is like exec.CommandContext, but:

or the failure is internal to the run-time.
GOTRACEBACK=none omits the goroutine stack traces entirely.
GOTRACEBACK=single (the default) behaves as described above.
GOTRACEBACK=all adds stack traces for all user-created goroutines.
GOTRACEBACK=system is like “all” but adds stack frames for run-time functions
and shows goroutines created internally by the run-time.
GOTRACEBACK=crash is like “system” but crashes in an operating system-specific

For runtime error debugging, it may be useful to run with `GOTRACEBACK=system`
or `GOTRACEBACK=crash`. The output of `panic` and `fatal` is as described by
`GOTRACEBACK`. The output of `throw` always includes runtime frames, metadata
and all goroutines regardless of `GOTRACEBACK` (i.e., equivalent to
`GOTRACEBACK=system`). Whether `throw` crashes or not is still controlled by
`GOTRACEBACK`.

Synchronization
===============

	if err := o.Close(); err != nil {
		t.Fatal(err)
	}

	env := []string{"TEST_OUTPUT=" + outputPath}
	for _, e := range os.Environ() {
		if strings.HasPrefix(e, "GODEBUG=") || strings.HasPrefix(e, "GOTRACEBACK=") {
			continue
		}
		env = append(env, e)
	}

	proc, err := os.StartProcess(fdsBin, []string{fdsBin}, &os.ProcAttr{
		Env:   env,
		Files: []*os.File{},
	})
	if err != nil {
		t.Fatal(err)
	}

// license that can be found in the LICENSE file.

package runtime

import (
	"internal/bytealg"
	"internal/goarch"
	"internal/runtime/atomic"
	"unsafe"
)

// Keep a cached value to make gotraceback fast,
// since we call it on every call to gentraceback.
// The cached value is a uint32 in which the low bits
// are the "crash" and "all" settings and the remaining

	// To help debugging, immediately log version
	klog.Infof("Version: %+v", version.Get())

	klog.InfoS("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))

	config, err := NewConfig(opts)
	if err != nil {
		return err
	}
	completed, err := config.Complete()
	if err != nil {
		return err
	}

env GO111MODULE=on
env GOFLAGS=-mod=mod
[short] skip

# golang.org/issue/30166: 'go mod tidy' should not crash if a replaced module is
# involved in a cycle.
cd cycle
env GOTRACEBACK=off
go mod tidy
cd ..

# From inside the module, 'go list -m all' should NOT include transitive
# requirements of modules that have been replaced.
go list -m all
stdout 'rsc.io/quote/v3 v3.0.0'
! stdout 'rsc.io/sampler'
! stdout 'golang.org/x/text'

env GO111MODULE=on
env GOTRACEBACK=single

# Go 1.21 work module should leave panicnil with an implicit default.
cp go.mod.21 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}'
! stdout panicnil
stdout randautoseed=0

# Go 1.21 work module should NOT set panicnil=1 in Go 1.20 dependency.
cp go.mod.21 go.mod
go list -f '{{.Module.GoVersion}} {{.DefaultGODEBUG}}' q
! stdout panicnil=1
! stdout randautoseed