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Bug #77900 Memcache session handling, zend_mm_heap corrupted
Submitted: 2019-04-15 14:35 UTC Modified: 2021-03-25 16:41 UTC
Votes:8
Avg. Score:4.6 ± 0.5
Reproduced:8 of 8 (100.0%)
Same Version:5 (62.5%)
Same OS:2 (25.0%)
From: bb0072 at gmail dot com Assigned: cmb (profile)
Status: Closed Package: memcache (PECL)
PHP Version: 7.3.4 OS: Ubuntu 18.04.2 LTS
Private report: No CVE-ID: None
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 [2019-04-15 14:35 UTC] bb0072 at gmail dot com 
Description:
------------
When I try to use sessions in my script (php 7.3) with session.save_handler=memcache, I get the following error message: zend_mm_heap corrupted.
Same script on same server does work with php 5.6.

I use the php-memcache extension (not php-memcached!)

Software versions (the most recent stable versions from the Ubuntu 18.04 repo, and php versions from here: http://ppa.launchpad.net/ondrej/php/ubuntu bionic main):

 * php7.3-cli (7.3.3-1+ubuntu18.04.1+deb.sury.org+1)
 * php-memcache (3.0.9~20170802.e702b5f-1+ubuntu18.04.1+deb.sury.org+10)
 * memcached (1.5.6-0ubuntu1 )

Memcache.ini settings (/etc/php/7.3/mods-available/memcache.ini)
extension=memcache.so
[memcache]
memcache.allow_failover="1"
memcache.max_failover_attempts="20"
memcache.chunk_size="8192"
memcache.default_port="11211"
memcache.redundancy=1
memcache.session_redundancy=2
memcache.compress_threshold=20000




Test script:
---------------
<?php
ini_set('session.save_handler', 'memcache');
ini_set('session.save_path', 'tcp://localhost:11211');
session_start();
$_SESSION['test']=true;
session_write_close();
session_start();
var_dump($_SESSION);
session_write_close();


Expected result:
----------------
array(1) {
  ["test"]=>
  bool(true)
}

Actual result:
--------------
zend_mm_heap corrupted

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 [2020-03-06 21:00 UTC] tandre@php.net 
I linked to this in https://github.com/websupport-sk/pecl-memcache/issues/65

The original bug report was for 3.0.9, but I assume there were significant refactorings in 4.0.5.2 (released in December 2019).

When I try to run this script in php 7.4.3-dev (NTS DEBUG) with PECL memcache 4.0.5.2, I see the following memory leak instead (low severity because it uses erealloc(), which is freed after each HTTP response on a web server):

```
ยป php --no-php-ini --php-ini test.ini test.php
array(1) {                                     
  ["test"]=>                                   
  bool(true)                                   
}                                              
[Fri Mar  6 15:40:14 2020]  Script:  '/path/to/test.php'
/tmp/pear/temp/memcache/php7/memcache_queue.c(35) :  Freeing 0x00007f0542e7d700 (208 bytes), script=/path/to/test.php
Last leak repeated 3 times
=== Total 4 memory leaks detected ===
```

Does anyone see other cases causing zend_mm_heap_corrupted with Memcache sessions in 4.0.5.2?
 [2020-10-05 10:42 UTC] jochem dot blok at fasterforward dot nl 
I can reproduce this problem on PHP 7.4 with Ubuntu 20.04. Any progress on this issue?
 [2020-10-05 12:03 UTC] jochem dot blok at fasterforward dot nl 
Updating the package to version 4.0.5.2 seems to resolve the issue. I made a bug report for the outdated version of the php-memcache package in Ubuntu 20.04. See https://bugs.launchpad.net/ubuntu/+source/php-memcache/+bug/1898548
 [2021-03-25 16:41 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-03-25 16:41 UTC] cmb@php.net 
The official bug tracker for PECL/memcache is now at
<https://github.com/websupport-sk/pecl-memcache/issues>.

So, if this is still an issue with either of the current memcache
versions (4 or 8), please file an issue there.
 
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