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 5 package 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 14 extern void Nop(char*); 15 16 // Use weak as a hack to permit defining a function even though we use export. 17 void poison() __attribute__ ((weak)); 18 19 // Poison the stack. 20 void poison() { 21 char a[1024]; 22 Nop(&a[0]); 23 } 24 25 */ 26 import "C" 27 28 import ( 29 "runtime" 30 ) 31 32 func main() { 33 runtime.MemProfileRate = 1 34 start(100) 35 } 36 37 func 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 49 func Nop(*C.char) { 50 } 51
