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0e1f616
(Get the code!)
Here is what happens when USB dies. The CPU usage on I/O wait goes way up (to 100% on one core, and sometimes both), the USB processes and the process that was using USB is stuck in a state of uninterruptable sleep, and the only way to fix the issue is to re-boot. This happens on any activity ranging from the creation of a new 40 GB ext2/3 fs, to checking an ext2 filesystem. to lots of data transfer after mkfs. IOW, it seems to be somewhat random, but I can only actually trigger the issue when using some form of USB mass storage.
I am about to try this again after rebooting with a small flash drive to see if I can trigger it there. Larger devices certainly trigger it all the time.
Sometimes, some error messages show up in dmesg *before* the drive fails, about resetting low speed devices. I don't know why, because everything in this system should be USB 2.0, and I know that the drive is a USB 2.0 device.
I don't think that the APIC errors are related, though I suppose anything is possible. I get them all the time, but I do not know why.