I have a directadmin installation and by yesterday I have in my logs
*** glibc detected *** /usr/sbin/httpd: realloc(): invalid next size: 0x00007f488c022c30 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75e66)[0x7f493ca53e66]
/lib64/libc.so.6(+0x7b937)[0x7f493ca59937]...