It also happened on my amd64 today. I was trying to kill a crashed firefox/objdump/java-vm (together eating 2GB of non-shared memory). When that didn't work, I killed the apport process, and the kernel went mad.
The relevant line from top:
13784 mstreek 22 5 1804m 1.6g 536 D 0 80.7 0:09.45 objcopy
It also happened on my amd64 today. I was trying to kill a crashed firefox/ objdump/ java-vm (together eating 2GB of non-shared memory). When that didn't work, I killed the apport process, and the kernel went mad.
The relevant line from top:
13784 mstreek 22 5 1804m 1.6g 536 D 0 80.7 0:09.45 objcopy