Many hyphen marks kills the Redmine
We found out funky little error when you insert many hyphen marks into issue text box in certain format. This will crash the whole redmine process so that the server doesn't respond, database load increases quite a bit too. This was tested on revision 1666 and earlier releases.
The format is like: hyphen space hyphen space hyphen space hyphen ... etc.
For example this type of formating can be used in email signatures.