issue8158.go

     1  // run
     2  
     3  // Copyright 2014 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"runtime"
    11  	"time"
    12  )
    13  
    14  func main() {
    15  	c := make(chan bool, 1)
    16  	go f1(c)
    17  	<-c
    18  	time.Sleep(10 * time.Millisecond)
    19  	go f2(c)
    20  	<-c
    21  }
    22  
    23  func f1(done chan bool) {
    24  	defer func() {
    25  		recover()
    26  		done <- true
    27  		runtime.Goexit() // left stack-allocated Panic struct on gp->panic stack
    28  	}()
    29  	panic("p")
    30  }
    31  
    32  func f2(done chan bool) {
    33  	defer func() {
    34  		recover()
    35  		done <- true
    36  		runtime.Goexit()
    37  	}()
    38  	time.Sleep(10 * time.Millisecond) // overwrote Panic struct with Timer struct
    39  	runtime.GC()                      // walked gp->panic list, found mangled Panic struct, crashed
    40  	panic("p")
    41  }
    42
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