1// Copyright 2021 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package main 6 7import ( 8 "fmt" 9 "os" 10 "runtime" 11) 12 13func init() { 14 register("CrashDumpsAllThreads", CrashDumpsAllThreads) 15} 16 17func CrashDumpsAllThreads() { 18 const count = 4 19 runtime.GOMAXPROCS(count + 1) 20 21 chans := make([]chan bool, count) 22 for i := range chans { 23 chans[i] = make(chan bool) 24 go crashDumpsAllThreadsLoop(i, chans[i]) 25 } 26 27 // Wait for all the goroutines to start executing. 28 for _, c := range chans { 29 <-c 30 } 31 32 // Tell our parent that all the goroutines are executing. 33 if _, err := os.NewFile(3, "pipe").WriteString("x"); err != nil { 34 fmt.Fprintf(os.Stderr, "write to pipe failed: %v\n", err) 35 os.Exit(2) 36 } 37 38 select {} 39} 40 41func crashDumpsAllThreadsLoop(i int, c chan bool) { 42 close(c) 43 for { 44 for j := 0; j < 0x7fffffff; j++ { 45 } 46 } 47} 48