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Running 2.5.69 and later -mm patches USD will hang the machine solid
during shutdown. Using a camera I've gotten this output from the
console at the time it hangs:

ehci-hcd 02:0e.2: remove, state 3
usb usb1: USB disconnect, address 1
[HANG]

Nothing else, not even USB verbose messages reveals anything more.

dmesg and .config various output attached.