// environment variable values (currently we only force GOTRACEBACK=none)
	//
	// Other packages may also disable specific functionality when secure mode
	// is enabled (determined by using linkname to call isSecureMode).

	secureEnv()
}

func secureEnv() {
	var hasTraceback bool
	for i := 0; i < len(envs); i++ {
		if stringslite.HasPrefix(envs[i], "GOTRACEBACK=") {
			hasTraceback = true
			envs[i] = "GOTRACEBACK=none"

	}
}

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:

	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)
	}

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

		return _NCONT
	}
Throw:
	mp.throwing = throwTypeRuntime
	mp.caughtsig.set(gp)
	startpanic_m()
	print(notestr, "\n")
	print("PC=", hex(c.pc()), "\n")
	print("\n")
	level, _, docrash = gotraceback()
	if level > 0 {
		goroutineheader(gp)
		tracebacktrap(c.pc(), c.sp(), c.lr(), gp)
		tracebackothers(gp)
		print("\n")
		dumpregs(_ureg)
	}
	if docrash {
		crash()
	}
Exit:

			strings.Contains(stack, "created by testing.RunTests") ||
			strings.Contains(stack, "closeWriteAndWait") ||
			strings.Contains(stack, "testing.Main(") ||
			// These only show up with GOTRACEBACK=2; Issue 5005 (comment 28)
			strings.Contains(stack, "runtime.goexit") ||
			strings.Contains(stack, "created by runtime.gc") ||
			strings.Contains(stack, "interestingGoroutines") ||

	const prefix = "crash/crash"
	return counter.EncodeStack(pcs, prefix), nil
}

// parseStackPCs parses the parent process's program counters for the
// first running goroutine out of a GOTRACEBACK=system traceback,
// adjusting them so that they are valid for the child process's text
// segment.
//
// This function returns only program counter values, ensuring that