There is a bug in the Xsession script shipped with RHEL 5. A "umask" command was
accidentally spelled as "unask".
This causes Xsession errors to be redirected to /tmp/xses-$USER-XXXXXX instead
of $HOME/.xsession-errors, but it otherwise harmless as far as I can tell.
This request was evaluated by Red Hat Product Management for
inclusion, but this component is not scheduled to be updated in
the current Red Hat Enterprise Linux release. This request will
be reviewed for a future Red Hat Enterprise Linux release.
*** This bug has been marked as a duplicate of 239471 ***
239471 has nothing to do with this bug, I think you mean 239478 (because that's
what 236629 refers to), but I'm not allowed to access that.