So, I just updated everything at my x86_64 CentOS 5.1 Linux installation. And everything looked fine until I found out that email can not be received, and what’s more - I can not log in at Roundcube webmail anymore. The same was in SquirrelMail - both clients just hang/freeze when trying to login, without any kind of meaningful notification - just waiting indefinitely.

I checked a log files, and saw something like this:

error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory

To fix the issue, open the /etc/dovecot.conf and adjust (uncomment) the following directive:

login_process_size = 64

Stupid as it looks, but thats it.