1// Copyright 2015 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 7// The memory profiler can call copy from a slice on the system stack, 8// which msan used to think meant a reference to uninitialized memory. 9 10/* 11#include <time.h> 12#include <unistd.h> 13 14extern void Nop(char*); 15 16// Use weak as a hack to permit defining a function even though we use export. 17void poison() __attribute__ ((weak)); 18 19// Poison the stack. 20void poison() { 21 char a[1024]; 22 Nop(&a[0]); 23} 24 25*/ 26import "C" 27 28import ( 29 "runtime" 30) 31 32func main() { 33 runtime.MemProfileRate = 1 34 start(100) 35} 36 37func start(i int) { 38 if i == 0 { 39 return 40 } 41 C.poison() 42 // Tie up a thread. 43 // We won't actually wait for this sleep to complete. 44 go func() { C.sleep(1) }() 45 start(i - 1) 46} 47 48//export Nop 49func Nop(*C.char) { 50} 51