Just an fyi for people with the threadirqs parameter passed wondering why the panic after logging in KDE session. Seems it’s an upstream bug.
3.13.0-9.g4b6e17a-desktop #1 SMP PREEMPT Wed Jan 22 17:02:23 UTC 2014 (4b6e17a) x86_64 x86_64 x86_64 GNU/Linux