If you use an old kernel and recently updated your glibc you may encounter:

Writing /var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/temp/images/2.6/usr/lib/python2.6/site-packages/py_rrdtool-0.2.1-py2.6.egg-info
cp: preserving times for `/var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/image/usr/lib/python2.6/site-packages': Bad file descriptor
cp: preserving times for `/var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/image/usr/lib/python2.6': Bad file descriptor
cp: preserving times for `/var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/image/usr/lib': Bad file descriptor
cp: preserving times for `/var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/image/usr': Bad file descriptor
 * ERROR: net-analyzer/rrdtool-1.4.5-r1 failed (install phase):
 *   Merging of intermediate installation image for Python ABI '2.6 into installation image failed
 *
 * Call stack:
 *     ebuild.sh, line   56:  Called src_install
 *   environment, line 6431:  Called distutils_src_install
 *   environment, line 1760:  Called python_merge_intermediate_installation_images '/var/tmp/portage/net-analyzer/rrdtool-1.4.5-r1/temp/images'
 *   environment, line 5704:  Called die
 * The specific snippet of code:
 *               cp -fr --preserve=all --no-preserve=context "${intermediate_installation_images_directory}/${PYTHON_ABI}/"* "${D}" || die "Merging of intermediate installation image for Python ABI '${PYTHON_ABI} into installation image failed";

To address this issue update coreutils:

# emerge --update coreutils
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