https://bugs.freedesktop.org/show_bug.cgi?id=104082
--- Comment #18 from Stratos Zolotas strzol@gmail.com --- (In reply to Michel Dänzer from comment #17)
The swiotlb messages this report is about are harmless (though a fix is on the way anyway), the other issues you mention are probably not directly related.
I can say that it is not completely harmless. I'm using virtualbox on my KDE plasma desktop and I have several crashes on windows VMs which are "aborted" while running. At the time the "aborted" is happening, I can see a flood of this type of messages on my logs. Didn't had any issue with my windows virtualbox VMs up to now and the "aborted" crash has resulted on broken VMs who need repair. Although haven't seen any btrfs corruption or other issue.