This morning I noticed a php error whining about inaccessible device. After further investigation I found that this is due to fact that 100% of virtual memory is used. After a reboot (I thought I'll clean it up for the time) a new problem arrived. The memory is now at 0% however no process can write to it.
Nothing was changed for quite some time thus I'm not sure what could be the problem. No logs indicate what could be the cause though some complain about being unable to write to the virtual memory (which is an effect and not the cause, obviously)
Any ideas where to look for the culprit?
Some of the software running on the server and their status after reboot
opendkim - failed to start postfix - failed to start courrier - running clamav - running svnserve - running mongodb - running (failing to read/write) mysqld - failed to start vsftpd - running apache2 - success