OSX El Capitan 中可能存在内存泄漏 Valgrind [英] Possible Memory Leak Valgrind in OSX El Capitan

问题描述

在 OSX Yosemite 上使用 Valgrind 时，我收到可能丢失的警告:1 个块中的 2,064 字节.有没有办法解决这个问题?我使用 brew 安装了 valgrind.

I'm getting a warning for possibly lost: 2,064 bytes in 1 blocks when using Valgrind on OSX Yosemite. Is there a fix to this? I installed valgrind using brew.

以下是如何重现的示例

~/cat hello.c
int main() {
    return 123;
}

~/uname -a
Darwin mac.local 15.2.0 Darwin Kernel Version 15.2.0: Fri Nov 13 19:56:56 PST 2015; root:xnu-3248.20.55~2/RELEASE_X86_64 x86_64 i386 MacBookAir6,2 Darwin

~/clang --version
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.2.0
Thread model: posix

~/valgrind --version
  valgrind-3.11.0

~/brew info valgrind
valgrind: stable 3.11.0 (bottled), HEAD
Dynamic analysis tools (memory, debug, profiling)
http://www.valgrind.org/
/usr/local/Cellar/valgrind/3.11.0 (328 files, 46.7M) *
  Poured from bottle
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/valgrind.rb

~/clang hello.c -o hello.o

~/valgrind --leak-check=full ./hello.o
==7972== Memcheck, a memory error detector
==7972== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==7972== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==7972== Command: ./hello.o
==7972== 
==7972== 
==7972== HEAP SUMMARY:
==7972==     in use at exit: 22,411 bytes in 187 blocks
==7972==   total heap usage: 271 allocs, 84 frees, 28,651 bytes allocated
==7972== 
==7972== 2,064 bytes in 1 blocks are possibly lost in loss record 57 of 62
==7972==    at 0x10000817C: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.11.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==7972==    by 0x1004F3EFD: _objc_copyClassNamesForImage (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E7182: protocols() (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E7093: readClass(objc_class*, bool, bool) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E4C13: gc_init (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004EC24E: objc_initializeClassPair_internal(objc_class*, char const*, objc_class*, objc_class*) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004F9132: layout_string_create (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E783C: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E7300: copySwiftV1MangledName(char const*, bool) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E72E9: copySwiftV1MangledName(char const*, bool) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E72E9: copySwiftV1MangledName(char const*, bool) (in /usr/lib/libobjc.A.dylib)
==7972==    by 0x1004E72E9: copySwiftV1MangledName(char const*, bool) (in /usr/lib/libobjc.A.dylib)
==7972== 
==7972== LEAK SUMMARY:
==7972==    definitely lost: 0 bytes in 0 blocks
==7972==    indirectly lost: 0 bytes in 0 blocks
==7972==      possibly lost: 2,064 bytes in 1 blocks
==7972==    still reachable: 0 bytes in 0 blocks
==7972==         suppressed: 20,347 bytes in 186 blocks
==7972== 
==7972== For counts of detected and suppressed errors, rerun with: -v
==7972== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 17 from 17)

推荐答案

Valgrind 主要是 Linux 的工具，OSX 支持较少.这意味着 Valgrind 会在 OSX 上产生大量误报.如果你想抑制那些可能丢失的泄漏，然后添加 --gen-suppressions=all(或者 --gen-suppressions=yes 如果你想挑选和选择一一报告泄漏)选项到您的 valgrind 调用.这将做的是为每个报告的内存泄漏打印一段文本，看起来像这样:

Valgrind is mostly a tool for Linux, and is less supported for OSX. This means that Valgrind will generate a lot of false positives on OSX. If you want to suppress those possibly lost leaks, then add the --gen-suppressions=all (or --gen-suppressions=yes if you want to pick and choose reported leaks one by one) option to your valgrind call. What this will do is print off a chunk of text for each reported memory leak that will look something like this:

{
   <insert_a_suppression_name_here>
   Memcheck:Leak
   match-leak-kinds: indirect
   fun:malloc
   fun:__Balloc_D2A
   fun:__rv_alloc_D2A
   fun:__dtoa
   fun:__vfprintf
   fun:__v2printf
   fun:vfprintf_l
   fun:printf
   fun:main
}

将它、括号和所有内容复制并粘贴到名为 /Users/username/leak1.supp 之类的文件中.随意将 <...> 更改为实际名称以进行抑制.然后当你调用 valgrind 时，如果你添加一个 --suppressions=/Users//leak1.supp 选项，该内存泄漏报告将被抑制.为了更简单，你可以把东西放在 ~/.valgrindrc 文件中.这个文件看起来像

Copy and paste that, brackets and all, to a file called something like /Users/username/leak1.supp. Feel free to change the <...> to an actual name for your suppression. Then when you call valgrind, if you add a --suppressions=/Users/<username>/leak1.supp option, that memory leak report will be suppressed. To make this easier, you can just put stuff in a ~/.valgrindrc file. This file could look something like

--tool=memcheck
--leak-check=full
--show-reachable=yes
--suppressions=/Users/benlindsay/leak1.supp
--suppressions=/Users/benlindsay/leak2.supp

或者，如果您可以改为在 Linux 机器上测试您的代码，您就不必担心这一切；)

Or if you can just test your code on a Linux machine instead, you won't have to worry about all this ;)

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