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recently I began to notice the following error message in the apache error log. I'm running

Apache 2.2.22 with PHP 5.4.4 on Debian 7.4. All installed from stable packages.

The error occurs randomly, somtimes up to 10 times in a row. Most occurances are singular. The server keeps running without any problems. Requests are served directly before and after. I couldn't identify any suspicious requests an the access logs. Anybody experiencing this too? Suggestions?

Here's the error message:

*** glibc detected *** /usr/sbin/apache2: corrupted double-linked list: 0x00007f730a98c470 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x76d76)[0x7f7308dc0d76]
/lib/x86_64-linux-gnu/libc.so.6(+0x771ed)[0x7f7308dc11ed]
/lib/x86_64-linux-gnu/libc.so.6(+0x786a8)[0x7f7308dc26a8]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x6c)[0x7f7308dc5b1c]
/usr/lib/apache2/modules/libphp5.so(+0x292c35)[0x7f730588cc35]
/usr/lib/apache2/modules/libphp5.so(+0x28f9a0)[0x7f73058899a0]
/usr/lib/apache2/modules/libphp5.so(+0x36cbf3)[0x7f7305966bf3]
/usr/lib/apache2/modules/libphp5.so(+0x371ec5)[0x7f730596bec5]
/usr/lib/apache2/modules/libphp5.so(zend_hash_graceful_reverse_destroy+0x18)[0x7f730596d6b8]
/usr/lib/apache2/modules/libphp5.so(+0x36545e)[0x7f730595f45e]
/usr/lib/apache2/modules/libphp5.so(php_module_shutdown+0x2b)[0x7f730590009b]
/usr/lib/apache2/modules/libphp5.so(php_module_shutdown_wrapper+0x9)[0x7f7305900159]
/usr/lib/apache2/modules/libphp5.so(+0x40eac1)[0x7f7305a08ac1]
/usr/lib/libapr-1.so.0(apr_pool_destroy+0x7e)[0x7f730930b99e]
/usr/sbin/apache2(+0x5b90e)[0x7f7309c0190e]
/usr/sbin/apache2(+0x5bd7e)[0x7f7309c01d7e]
/usr/sbin/apache2(+0x5c382)[0x7f7309c02382]
/usr/sbin/apache2(ap_mpm_run+0x9d6)[0x7f7309c02ee6]
/usr/sbin/apache2(main+0xc26)[0x7f7309bd7826]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)[0x7f7308d68ead]
/usr/sbin/apache2(+0x318c1)[0x7f7309bd78c1]
======= Memory map: ========

... removed ...

[Wed Feb 12 19:33:23 2014] [notice] child pid 6408 exit signal Aborted (6)

The follwing PHP modules are installed:

bcmath
bz2
calendar
Core
ctype
curl
date
dba
dom
ereg
exif
fileinfo
filter
ftp
gd
gettext
hash
iconv
imagick
json
libxml
mbstring
mcrypt
mhash
mysql
mysqli
openssl
pcntl
pcre
PDO
pdo_mysql
Phar
posix
Reflection
session
shmop
SimpleXML
soap
sockets
SPL
standard
sysvmsg
sysvsem
sysvshm
tokenizer
wddx
xml
xmlreader
xmlwriter
zip
zlib

And here are the apache modules

core_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 alias_module (shared)
 auth_basic_module (shared)
 authn_file_module (shared)
 authz_default_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cgi_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 expires_module (shared)
 headers_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 php5_module (shared)
 proxy_module (shared)
 proxy_connect_module (shared)
 proxy_http_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 ssl_module (shared)
 status_module (shared)
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