I just noticed that the SCM polling failed for all of our builds because no temporary files could be created in /tmp.

When looking there, I saw there were some 32k files named like hudson2195781228286547025tmp and that I'm hitting a filesystem limit that only allows a directory to have up to 32K files.

I deleted them all but they keep reappearing.

$ ls -la /tmp | grep hudson| wc -l
8
$ ls -la /tmp | grep hudson| wc -l
28
$ ls -la /tmp | grep hudson| wc -l
42