I logged into my horde warlock (afflic) alt (going for achievement at 90's of both factions), and hearthed from Silvermoon to Tranquillen. At level 17 I felt it was time to take on the two elite aboms that roam the area, and I'd use my voidwalker to tank them.
I dismissed my imp and summoned the void-walker I've summon before. Surprisingly he came up with the Summoning Disorientation debuff with a duration of 519 hours and 44 minutes. No joke. I resummoned over a dozen times. I tried logging out and back in. I ran through the Ghostlands into Eastern Plaguelands and summoned/resummoned there. I hearthed home. I entered and left combat.
Nothing worked. I've put in a ticket, but I'm curious if anyone else has seen this and if they've found a way around it.