Steam Crashing on Fedora 20 when Message Received
I found this on the Steam forums. I was having a problem with Steam under Fedora 20 crashing when I received a message from one of my friends. It's a selinux permissions problem with the sound that is played when you receive a message. Below is a copy and paste of the post.
This is really a bug with Steam that they need to fix. Having execheap is apparently bad and avoidable so hopefully with some pressure Valve should sort it out.
setsebool -P selinuxuser_execheap 1
Is a workaround in the meantime. Although you need to remember to set it back later when it's sorted.