ora-0600 is the catch-all error that means 'you hit a bug in the oracle code'. The only recourse is to first log on to your MOS account and use the ora-0600 lookup tool to narrow it down and see if there are any docs or patches related to the specifics of your error. And if that doesn't yeild useful results you have to open an SR. If you don't have a support contract (giving you access to MOS) I'm afraid you are out of luck.
Thanks for the reply Ed. This is an issue for one of my clients. I already looked into ORA-600 lookup tool with no success, and told the client they need to open a SR, but since sometimes it takes a long while for Oracle to give you support, I thought in opening a new thread here to see if someone else have faced this also and can help me out. Best.