Hello! This happened 4 times today on the same machine: 17:59:12 : umass0: at uhub2 port 1 (addr 4) disconnected 17:59:12 : (da0:umass-sim0:0:0:0): lost device 17:59:12 : (da0:umass-sim0:0:0:0): removing device entry 17:59:12 : umass0: detached 17:59:12 : 17:59:12 : 17:59:12 : Fatal trap 12: page fault while in kernel mode 17:59:12 : fault virtual address = 0x3c 17:59:12 : fault code = supervisor read, page not present 17:59:12 : instruction pointer = 0x8:0xc01b3732 17:59:12 : stack pointer = 0x10:0xd7ad3f08 17:59:12 : frame pointer = 0x10:0xd7ad3f08 17:59:12 : code segment = base 0x0, limit 0xfffff, type 0x1b 17:59:12 : = DPL 0, pres 1, def32 1, gran 1 17:59:12 : processor eflags = interrupt enabled, resume, IOPL = 0 17:59:12 : current process = 5 (usb1) 17:59:12 : interrupt mask = none 17:59:12 : trap number = 12 17:59:12 : panic: page fault Tha machine runs FreeBSD 4.11-STABLE #4: from Sat May 7... The device is: umass0: SanDisk Corporation ImageMate CompactFlash USB, rev 1.10/0.09, addr 4 According to `nm /kernel', the symbols near the instruction pointer above are: c01b36e8 T device_set_softc c01b372c T device_get_ivars c01b373c T device_set_ivars c01b3750 T device_get_state Any suggestions/patches for usb? Thanks! -mi