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35a32c5
(Get the code!)
I don't think this is a libvirt problem. It also appears intermittent here. In doing other testing I was looping attach and detach and found that kvm (presumably) died, with the guest disappearing (and needed to be started again). Attached is a (very crude) test script that can be called with:
$ ./432154.sh <vm name> device # for attach-device
$ ./432154.sh <vm name> disk # for attach-disk
Don't use this on a VM you care about. Also, I found that kvm died late in the guest boot process (my testing was with a 32 bit Jaunty install on x86_64 host). Also, while the test script tries to be careful about restoring the guest xml, it doesn't always work, and you may need to remove the attach device by editing the XML via dumpxml/edit xml/define.