Recovery password root

Please, help.

What happened?

{0} ok boot cdrom -s
Boot device: /pci@0/pci@0/pci@1/pci@0/pci@1/pci@0/usb@0,2/storage@2/disk@0:f  File and args: -s
SunOS Release 5.10 Version Generic_118833-33 64-bit
Copyright 1983-2006 Sun Microsystems, Inc.  All rights reserved.
Use is subject to license terms.
Booting to milestone "milestone/single-user:default".
\
panic[cpu52]/thread=2a10084dcc0: bad stack overflow at TL 2

%tl %tpc              %tnpc             %tstate           %tt
 1  0000000001043cf8  0000000001043cfc  0080001605        09c
    %gl: 00  %ccr: 00  %asi: 80  %cwp: 5  %pstate: 16<PEF,PRIV,IE>
 2  0000000001001300  0000000001001304  10080001407        031
    %gl: 01  %ccr: 00  %asi: 80  %cwp: 7  %pstate: 14<PEF,PRIV>
    %gl: 02
%g0-3: 0000000000000000 000000000000000a 0000000799714b08 0000000799714b08
%g4-7: 0000000015080423 0000000000000002 0000000001814f00 0000000000000031
    %gl: 01
%g0-3: 0000000000000000 000000000117a000 00000000003b1890 0000000000000150
%g4-7: 0000000000000006 86000007ff4007a3 0000000000000004 0000000000000004