Here is some detail from Metalink.

Problem Description
-------------------

You are receiving an ORA-7445 error when creating a trigger in version 9.0.1.1,
possibly using a third-party tool such as Toad. The error appears similar to
the following:

ORA-07445: exception encountered: core dump [0000000101B6D1FC] [SIGSEGV]
[Address not mapped to object] [0x000000010] [] []

Solution Description
--------------------

1. Try dropping and recreating the trigger, which often resolves the problem.

2. Make sure you are using SQL*Plus and *not* Toad to compile the problem
trigger.

If these suggestions fail, do the following:

1. ANALYZE all tables and indexes associated with this trigger with a
VALIDATE STRUCTURE.

2. Shutdown the database and relink all of Oracle, including SQL*Plus.

3. Upgrade to the latest Oracle9i patchset.



Originally posted by eyen
Your not going to like this answer . . .
But, I looked up the error using Instant Messages from Quest Software and its says:

Cause: An operating system exception occurred which should result in the creation of a core file. This is an internal error.

Action: Contact Oracle Support Services

Sorry but its like a ora-00600 . . . contact Oracle Support because you screwed.