I do not have space enough for /var/tmp, so I symlinked it to /hda6/var/tmp/ which is a reiserfs partion. When I emerge a port (e.g. mozilla) I get wierd errors. If the bug is not reproducable I can include error msg.
This is not a reiserfs problem. If the foreign partition is tmpfs I get the same problem. But now I seem to have found a workaround: mount /hda6/var/tmp /var/tmp --bind
Will be fixed in Portage 2.0.12