problem with custom Gist for custom type - Mailing list pgsql-hackers

Hi there folks

I created custom type, and attempt to create gist indexing for it, to  
make search wind quick.
on select from * where something << 'something'; I get:

WARNING:  problem in alloc set GiST temporary context: detected write  
past chunk end in block 0x843e6e0, chunk 0x843e994

Can someone tell me please, what might be the cause?

Thanks