SQL database hang

Hi,

I'm attempting to perform a snapshot backup of SQL database, due to
some space constraints the snapshot creation fails.
From the SQL trace log I could find the IO was frozen and after
snapshot failure it was thawed - but the database remains hung.

As from in code I'm trying to free the SQL DMO component - using the
call CoUninitialize() API
which takes abt 15-20 minutes to return.

Thanks in advance,
atvelu
.