/tmp isn't cleaned up upon boot.  Here's the trivial patch:

--- rc.sysinit.orig     Mon Nov 20 15:00:51 2000
+++ rc.sysinit  Mon Nov 20 15:23:59 2000
@@ -218,6 +218,9 @@
 mount -f /
 mount -f /proc
 
+# Remove all files in /tmp
+action "Clearing /tmp" rm -rf /tmp/.[^.] /tmp/.??* /tmp/*
+
 # Update quotas if fsck was run on /.
 if [ X"$_RUN_QUOTACHECK" = X1 -a -x /sbin/quotacheck ]; then
        action "Checking root filesystem quotas"  /sbin/quotacheck -v /