Noticed that this can be easily triggered by switching between text and X
console few times.

My current versions:
# uname -a
Linux Cerberos 3.6.5-10-desktop #1 SMP PREEMPT Wed Oct 31 20:15:15 UTC 2012
(cefb3b0) x86_64 x86_64 x86_64 GNU/Linux
# rpm -q libdrm_radeon1
libdrm_radeon1-2.4.39-94.1.x86_64