This is certainly not a glibc "bug", but perhaps something that required
better documentation.  As stated previously, the restart code you see
has nothing to do with security updates, but is to make sure that
various services don't explode on major version upgrades.

The reality, though, is that every time you perform a security update of
a library (any library, this isn't libc-specific), you might want to
restart the daemons linked to it.  Now, in many cases, this will be
handled in time by logrotate cronjobs restarting things, and other such
mechanisms, but not everything restarts itself over time.

Again, I think this is a user education (and, hence, documentation)
issue.  Prompting people to reboot after ever single upgrade is heavy-
handed and unnecessary (and dilutes the severity when we tell you that
really DO need to reboot), but people should be aware of what's going
on, if they read a bit.

(All of the above said, it might be kinda slick for upstart to have a
dpkg trigger that could walk "libraries installed in the last dpkg run",
compare against "processes currently running and linked to those
libraries that I know how to restart" and bounce the ones that have
upstart jobs)

-- 
libc security update does not trigger apache (and others) to be restarted
https://bugs.launchpad.net/bugs/587982
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