sqlplus shutdown "time-out"

Hi all,

9.2.0.5.0 on Aix 5L.
Before our cold RMAN backups, we shutdown and startup the instances as foll=
ows:

sqlplus '/ as sysdba' <<EOD
shutdown immediate
startup
shutdown immediate
startup mount
EOD

Sometimes both shutdowns seem to time-out automatically (certainly
while Oracle is busy rolling back some huge transactions):

=3D=3D> Beginning consistent instance shutdown and mount: Thu Apr 14
01:35:02 DFT 2005

SQL*Plus: Release 9.2.0.5.0 - Production on Thu Apr 14 01:35:02 2005

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Connected to:
Oracle9i Enterprise Edition Release 9.2.0.5.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production

SQL> ORA-01013: user requested cancel of current operation
SQL> ORA-01081: cannot start already-running ORACLE - shut it down first
SQL> ORA-01013: user requested cancel of current operation
SQL> ORA-01081: cannot start already-running ORACLE - shut it down first
SQL> Disconnected from Oracle9i Enterprise Edition Release 9.2.0.5.0 -
64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production
=3D=3D> Ended consistent instance shutdown and mount: Thu Apr 14 03:37:55 D=
FT 2005

Both "user requested cancel" aren't human actions and it seems that
both shutdowns time-out after 1 hour.

What might be the cause of thes time-outs giving that sql*net is not
involved and that sys's profile is "default" (idle_time=3Dunlimited). I
can't find any relevant time-out parameter for sqlplus (only for
isqlplus).

TIA,
Jerome
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