I've had this happen twice now, running Andrew's "not quite -mm2" patch. Symptoms: After about 20-30 minutes uptime, a running gkrellm shows system mode suddenly shoot up to 99-100%, and the keyboard dies. Oddly enough, a USB mouse continued working, and the X server was still quite responsive (I was able to close Firefox by opening a menu with the mouse and selecting 'quit', for example). alt-sysrq-foo still worked, but ctl-alt-N to switch virtual consoles didn't. sysrq-t produced a trace with nothing obviously odd - klogd, syslog, and the disk were all working. Nothing interesting in the syslog - no oops, bug, etc.. Another odd data point (I didn't notice if this part happened the first time): gkrellm reported that link ppp0 had inbound packets on the modem port of a Xircom ethernet/modem combo card. At the rate of 3.5M/second - a neat trick for a 56K modem. When I unplugged the RJ-11, gkrellm *kept* reporting the inbound traffic. When I ejected the card, *then* the ppp0 (and the alleged inbound packets) stopped - but still sitting at 99% system and no keyboard. This ring any bells? Any suggestions for instrumentation to help debug this?
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