Hi, All. There is a guy which have a repeatable panic in the sio(4). http://www.opennet.ru/openforum/vsluhforumID1/78445.html#9 Most interesting part of backtrace is: #5 0xc08860ba in calltrap () at /usr/src/sys/i386/i386/exception.s:139 No locals. #6 0xc0873700 in siointr1 (com=0xc3411400) at /usr/src/sys/dev/sio/sio.c:1613 ocount = 4287153708 int_ctl = 0 '\0' int_ctl_new = 0 '\0' line_status = 44 ',' modem_status = 0 '\0' ioptr = (u_char *) 0xc3b85000 <Address 0xc3b85000 out of bounds> recv_data = 69 'E' #7 0xc0873322 in siointr (arg=0xc3411400) at /usr/src/sys/dev/sio/sio.c:1391 com = (struct com_s *) 0xc3411400 #8 0xc0889e95 in intr_execute_handlers (isrc=0xc32b48c8, iframe=0xd4032c94) at /usr/src/sys/i386/i386/intr_machdep.c:270 td = (struct thread *) 0xc3284600 ie = (struct intr_event *) 0xc32cab00 ih = (struct intr_handler *) 0xc33f3840 vector = -1019267008 thread = 0 As i see there is no difference between 6.2 and 6.3 in the sio(4). Can someone help to fix this panic? -- WBR, Andrey V. Elsukov