This bug is not reproducible at all on an ordinary trusty chroot. There is nothing in any of the libc6 maintainer scripts which touches the /tmp directory directly, and nothing in the strace output shows inappropriate handling of /tmp. I think you're looking at a bug in your overlayfs implementation.
** Changed in: eglibc (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1464442 Title: installing or upgrading libc6 in Trusty removes all content from /tmp directory To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1464442/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs