Comment # 2 on bug 1087749 from Josef M�llers

I wouldn't call it a "mistake", but a "strange setup".

For one: it works as designed and this is a security feature: whenever a person
logs out who has mounted an encrypted partition, this partition will be
unmounted as to protect that person's data.

As you write "Changing this [/etc/security/pam_mount.conf.xml file] the does
not help ...": have you tried setting ALL THREE "hup", "term", AND "kill" to
"no"?

It prevents pam_mount from sending the corresponding signal using ofl and thus
the umount would fail UNLESS no-one happens to have an open file in the file
system.

Otherwise I see no way to solve this problem.