CINT making files in /tmp/


Can someone explain what is happening when cint is trying to make files in the the tmp directory. I run into troubles with errors like this after my script has been running for a while:

CAUTION: tmpfile /tmp/ZcfDVU_cint can’t open
Error: could not create file /tmp/ZcfDVU_cint

I don’t see any files in the tmp directory before the crash.