Sorry for long time reply...
Currently i use slack 11.0, here's the error message using cvs 1.11.22
*** glibc detected *** double free or corruption (fasttop): 0x080d7330 ***
this happen when I want to checkout or commit of my office project.
Using cvs 1.11.22 from slack 11 fresh install
also has the same problem.
Hmm,this is weird..but it's not a big prob.
I still use 1.11.20.