10G Intance crashed

Hi DBAs.    

The instance with Oracle 10g DB on Windows 2003 SP1 box suddenly crashed last night with the following error in the alert log file.  

ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [__chkstk+23] [PC:0x1D56927] [ADDR:0x5942AD28] [UNABLE_TO_READ] []    

When looked into the related trace file, the error is mentioned there as below:  

• SERVICE NAME:(SYS$USERS) 2007-11-10 02:30:14.652
• SESSION ID:(141.27363) 2007-11-10 02:30:14.652
• 2007-11-10 02:30:14.652

ksedmp: internal or fatal error

ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [__chkstk+23] [PC:0x1D56927] [ADDR:0x5942AD28] [UNABLE_TO_READ] []

Current SQL statement for this session:

update tsq$ set
blocks=:3,maxblocks=:4,grantor#=:5,priv1=:6,priv2=:7,priv3=:8 where ts#=:1 and user#=:2  

There was almost no user activity at that particular time. Has anyone experienced a similar error before?  

Any expert opinion?    

Thanks,

Khan  

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