I'm seeing 0xdeadbeef pointers in some of those traces, this suggests something's being freed unexpectedly...
One possible cause of this is a behavioral change in the usb stack, src/sys/dev/usb/usbdi.c, version 1.124, happened 10 days ago. How up to date is your source tree? If you don't have that patch, try updating to it and seeing if that makes a difference. If you already had it, does removing it change anything? -- Thanks, Jeremy
