Fatal trap 12 (mgetty)

[Mars Trading]

The machine was working fine for 24++hrs. then suddenly this:

--- begin ---

(several)
putc to a clist with no reservered cblocks
ucom0: read start failed

Fatal trap 12: page fault while in kernel mode
fault virtual address =	0x4c
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0478585a5
stack pointer = 0x10:0xc8c95a08
frame pointer = 0x10:0xc8c95a24
code segment = base 0x0, limit 0xfffff, type 0x1b
				= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 31031 (mgetty)

--- end ---

devices used:
ATEN USB->Serial adapters (uplcom) connected to serial modems.  
Machine is being used for remote access.  Nothing unusual in the 
kernel this time.

Help!

Dennis
-- 
Mars Trading
9620 Kamagong St., Makati,
Manila, Philippines
Phone: (632) 8952241
FAX: (632) 8996124
email: marstrade at gmail.com