| // Copyright 2015 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 main |
| |
| // The memory profiler can call copy from a slice on the system stack, |
| // which msan used to think meant a reference to uninitialized memory. |
| |
| /* |
| #include <time.h> |
| #include <unistd.h> |
| |
| extern void Nop(char*); |
| |
| // Use weak as a hack to permit defining a function even though we use export. |
| void poison() __attribute__ ((weak)); |
| |
| // Poison the stack. |
| void poison() { |
| char a[1024]; |
| Nop(&a[0]); |
| } |
| |
| */ |
| import "C" |
| |
| import ( |
| "runtime" |
| ) |
| |
| func main() { |
| runtime.MemProfileRate = 1 |
| start(100) |
| } |
| |
| func start(i int) { |
| if i == 0 { |
| return |
| } |
| C.poison() |
| // Tie up a thread. |
| // We won't actually wait for this sleep to complete. |
| go func() { C.sleep(1) }() |
| start(i - 1) |
| } |
| |
| //export Nop |
| func Nop(*C.char) { |
| } |
