Question

我几天来一直在为一个神秘的错误而苦苦挣扎。我正在使用PHP 7.1.0RC3（我使用 ZTS / pthreads启用重新编译了自己）。最近，我一直在研究一个用Redis取代MySQL的重构器，以优化我的应用程序中的非磁盘数据I / O.

我有一个脚本为每个加密货币市场创建一个线程（A）。线程（A）为每个交易策略创建另一个线程（B）。 B线程始终在A线程之前同步。

我一直收到此错误：zend_mm_heap corrupted。每次运行脚本时，它都会在执行的不同点发生。

我已经尝试了所有建议的修补程序，100个Google网页。垃圾收集，PHP配置/编译，所有内容都已经过详细审核。我还没找到任何与＆＃34; zend_mm_heap损坏＆＃34;，PThreads和Redis / Predis，相关的内容，而其他＆＃34;修复＆＃34;没有效果......

从Redis读取所有数据并保存到Redis（通过Predis）。仅在线程A或线程B中使用Predis时出现错误消息（每次更改）。当两个Predis方法调用快速连续发生时（例如，设置为get），它会更频繁地发生。

如果我使用shell_exec()直接通过CLI运行Redis命令，我就不会看到此错误。但是，它明显变慢了，所以可能只是缺少这种边缘情况？

如果有人能对以下任何一方提出任何意见/想法，我将不胜感激：

如何在我的应用程序中找到它的来源？
专用的Redis服务器是否可以修复此问题？
我应该向https://github.com/krakjoe/pthreads提交错误报告吗？
我应该向https://github.com/nrk/predis提交错误报告吗？
有没有人知道为什么zend_mm_heap corrupted可能会发生，一般来说，在一个线程＆＃34; safe＆＃34;环境（又名：ZTS）？或者我该如何防范呢？
我应该尝试编译甚至更多不同版本的PHP 7+吗？ https://github.com/php/php-src

我没有选择，请怜悯。我可以共享代码示例，但在这里粘贴它们不会非常有用。

修改我用./configure --enable-maintainer-zts --enable-pthreads --with-pthreads-sanitize --with-mysqli --enable-embedded-mysqli重新编译了PHP，我看到了一个我以前没见过的新错误：

==2716== ERROR: AddressSanitizer: heap-use-after-free on address 0x600800001c15 at pc 0xe25a87 bp 0x7f7a049feae0 sp 0x7f7a049fead0
READ of size 1 at 0x600800001c15 thread T1632
    #0 0xe25a86 (/usr/local/bin/php+0xe25a86)
    #1 0xe953c8 (/usr/local/bin/php+0xe953c8)
    #2 0xe4935b (/usr/local/bin/php+0xe4935b)
    #3 0xcbede3 (/usr/local/bin/php+0xcbede3)
    #4 0x98cfa9 (/usr/local/bin/php+0x98cfa9)
    #5 0x99dc3c (/usr/local/bin/php+0x99dc3c)
    #6 0x7f7b57e74a97 (/usr/lib64/libasan.so.0.0.0+0x19a97)
    #7 0x7f7b5694edc4 (/usr/lib64/libpthread-2.17.so+0x7dc4)
    #8 0x7f7b5667d73c (/usr/lib64/libc-2.17.so+0xf773c)
0x600800001c15 is located 5 bytes inside of 48-byte region [0x600800001c10,0x600800001c40)
freed by thread T1623 here:
    #0 0x7f7b57e71009 (/usr/lib64/libasan.so.0.0.0+0x16009)
    #1 0xe259fb (/usr/local/bin/php+0xe259fb)
    #2 0xe953c8 (/usr/local/bin/php+0xe953c8)
    #3 0xe4935b (/usr/local/bin/php+0xe4935b)
    #4 0xcbede3 (/usr/local/bin/php+0xcbede3)
    #5 0x98cfa9 (/usr/local/bin/php+0x98cfa9)
    #6 0x99dc3c (/usr/local/bin/php+0x99dc3c)
    #7 0x7f7b57e74a97 (/usr/lib64/libasan.so.0.0.0+0x19a97)
previously allocated by thread T0 here:
    #0 0x7f7b57e71129 (/usr/lib64/libasan.so.0.0.0+0x16129)
    #1 0xdb0118 (/usr/local/bin/php+0xdb0118)
    #2 0xe64f6c (/usr/local/bin/php+0xe64f6c)
    #3 0xe68c5d (/usr/local/bin/php+0xe68c5d)
    #4 0xcc4dcc (/usr/local/bin/php+0xcc4dcc)
    #5 0xcc5972 (/usr/local/bin/php+0xcc5972)
    #6 0x111f82c (/usr/local/bin/php+0x111f82c)
    #7 0x44c781 (/usr/local/bin/php+0x44c781)
    #8 0x7f7b565a7b34 (/usr/lib64/libc-2.17.so+0x21b34)
Thread T1632 created by T0 here:
    #0 0x7f7b57e65c3a (/usr/lib64/libasan.so.0.0.0+0xac3a)
    #1 0x99e4cb (/usr/local/bin/php+0x99e4cb)
    #2 0x975d2a (/usr/local/bin/php+0x975d2a)
    #3 0x11105c1 (/usr/local/bin/php+0x11105c1)
    #4 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #5 0x97b385 (/usr/local/bin/php+0x97b385)
    #6 0x11126bc (/usr/local/bin/php+0x11126bc)
    #7 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #8 0x97b385 (/usr/local/bin/php+0x97b385)
    #9 0x11126bc (/usr/local/bin/php+0x11126bc)
    #10 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #11 0x97b385 (/usr/local/bin/php+0x97b385)
    #12 0x11126bc (/usr/local/bin/php+0x11126bc)
    #13 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #14 0x97b385 (/usr/local/bin/php+0x97b385)
    #15 0x11126bc (/usr/local/bin/php+0x11126bc)
    #16 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #17 0x97b385 (/usr/local/bin/php+0x97b385)
    #18 0x1110b28 (/usr/local/bin/php+0x1110b28)
    #19 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #20 0x97b385 (/usr/local/bin/php+0x97b385)
    #21 0x11126bc (/usr/local/bin/php+0x11126bc)
    #22 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #23 0x97b385 (/usr/local/bin/php+0x97b385)
    #24 0x111c28a (/usr/local/bin/php+0x111c28a)
    #25 0xe52281 (/usr/local/bin/php+0xe52281)
    #26 0xcc766f (/usr/local/bin/php+0xcc766f)
    #27 0x1121d36 (/usr/local/bin/php+0x1121d36)
    #28 0x44d202 (/usr/local/bin/php+0x44d202)
    #29 0x7f7b565a7b34 (/usr/lib64/libc-2.17.so+0x21b34)
Thread T1623 created by T0 here:
    #0 0x7f7b57e65c3a (/usr/lib64/libasan.so.0.0.0+0xac3a)
    #1 0x99e4cb (/usr/local/bin/php+0x99e4cb)
    #2 0x975d2a (/usr/local/bin/php+0x975d2a)
    #3 0x11105c1 (/usr/local/bin/php+0x11105c1)
    #4 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #5 0x97b385 (/usr/local/bin/php+0x97b385)
    #6 0x11126bc (/usr/local/bin/php+0x11126bc)
    #7 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #8 0x97b385 (/usr/local/bin/php+0x97b385)
    #9 0x11126bc (/usr/local/bin/php+0x11126bc)
    #10 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #11 0x97b385 (/usr/local/bin/php+0x97b385)
    #12 0x11126bc (/usr/local/bin/php+0x11126bc)
    #13 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #14 0x97b385 (/usr/local/bin/php+0x97b385)
    #15 0x11126bc (/usr/local/bin/php+0x11126bc)
    #16 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #17 0x97b385 (/usr/local/bin/php+0x97b385)
    #18 0x1110b28 (/usr/local/bin/php+0x1110b28)
    #19 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #20 0x97b385 (/usr/local/bin/php+0x97b385)
    #21 0x11126bc (/usr/local/bin/php+0x11126bc)
    #22 0xf71de2 (/usr/local/bin/php+0xf71de2)
    #23 0x97b385 (/usr/local/bin/php+0x97b385)
    #24 0x111c28a (/usr/local/bin/php+0x111c28a)
    #25 0xe52281 (/usr/local/bin/php+0xe52281)
    #26 0xcc766f (/usr/local/bin/php+0xcc766f)
    #27 0x1121d36 (/usr/local/bin/php+0x1121d36)
    #28 0x44d202 (/usr/local/bin/php+0x44d202)
    #29 0x7f7b565a7b34 (/usr/lib64/libc-2.17.so+0x21b34)
Shadow bytes around the buggy address:
  0x0c017fff8330: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 fa
  0x0c017fff8340: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 fa
  0x0c017fff8350: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 00
  0x0c017fff8360: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 fa
  0x0c017fff8370: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 00
=>0x0c017fff8380: fa fa[fd]fd fd fd fd fd fa fa 00 00 00 00 00 00
  0x0c017fff8390: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c017fff83a0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c017fff83b0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
  0x0c017fff83c0: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 fa
  0x0c017fff83d0: fa fa 00 00 00 00 00 fa fa fa 00 00 00 00 00 fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:     fa
  Heap righ redzone:     fb
  Freed Heap region:     fd
  Stack left redzone:    f1
  Stack mid redzone:     f2
  Stack right redzone:   f3
  Stack partial redzone: f4
  Stack after return:    f5
  Stack use after scope: f8
  Global redzone:        f9
  Global init order:     f6
  Poisoned by user:      f7
  ASan internal:         fe
==2716== ABORTING

Answer 1

我发现内存损坏的来源，以及＆＃34;修复＆＃34;非常简单。我发现唯一的＆＃34;非致命的＆＃34;在pthreads中使用phpiredis $ client的方法是在当前本地范围内显式连接/执行命令/ disconnect。

总结一下，以下结果会导致高负载下的内存损坏：

尝试在线程上下文中通过引用将phpiredis $客户端传递给另一个对象
尝试按照线程上下文中的值将phpiredis $客户端传递给另一个对象
尝试在线程上下文中除了本地范围之外的任何地方实例化/使用phpiredis $客户端（例如：在另一个类中，_Redis，当我们当前在Investor :: save时）
尝试在线程上下文中静态重用phpiredis连接

但是，当以相同的方式/上下文将MySQLi $客户端传递给另一个对象时，不会发生内存损坏。

我希望这可以拯救别人在我见证的绝望的一周。这就是必须在pthreads中使用phpiredis的方法：

// Instantiate a local raw phpiredis $client and execute get/set commands using $client directly
// @Result: This WORKS :D
$client = phpiredis_connect('127.0.0.1', 6379);
$key = "table_name-_-$this->id";
foreach($args as $prop=>$val)
    if(isset($prop) && isset($val))
        phpiredis_command($client, "hset $key $prop $val");
$obj = phpiredis_command($client, "hgetall $key");
echo json_encode($obj);
phpiredis_disconnect($client);

PHP + PThreads + Redis / Predis = zend_mm_heap已损坏？

1 个答案: