I don't mean to sound like a "me too", but I've just run into the same problem. It has happened twice this week; but prior to the paging request error, I was getting kernel PREEMPTs that caused MythTV to hang up. I seem to recall that ivtv isn't really happy with preemption, so I compiled a new kernel and thought I was in the clear.
Prior to this issue my system has been stable for a long time now. The problems started when I installed a new HVR-1600 in preparation for the DTV change in the US. I am using a PVR-150, a PVR-350 using TV out, and now the HVR-1600. At least at this point, anyway, the problem has only occurred for me while I'm pushing an MPEG stream (captured on one of the first two cards) out through the PVR-350. Some possible problems that I've eliminated include whether it is a local APIC or ACPI problem. My machine doesn't want either enabled; the problem is especially catastrophic if I have "acpi=force" in the boot arguments. I'm sorry I can't provide much more than that at the moment. I will also be unavailable to test any changes for at least a few days, sorry. I do hope this additional info helps, though. --scott
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