one simple little test that i see differing results depending on kernel is 'mkfifo foo && ln foo bar'. Heres a test script that demos that, and output on precise, raring, saucy (no containers used).
== raring: 3.8.0-27-generic == $ ls -ld . drwxrwxrwt 5 root root 4096 Aug 21 19:16 . $ sudo rm -Rf lower upper mp $ mkdir lower upper mp $ sh -c 'echo hi > lower/f1.txt' $ sudo mount -t overlayfs -o lowerdir=/tmp/lower,upperdir=/tmp/upper overlay /tmp/mp $ sh -c 'cd mp && touch foo && ln foo bar' file link: user: PASS $ sudo sh -c 'cd mp && touch foo && ln foo bar' file link: root: PASS $ sh -c 'cd mp && mkfifo foo && ln foo bar' fifo link: user: PASS $ sudo sh -c 'cd mp && mkfifo foo && ln foo bar' fifo link: user: PASS == saucy: 3.11.0-2-generic == $ ls -ld . drwxrwxrwt 17 root root 32768 Aug 21 15:17 . $ sudo rm -Rf lower upper mp [sudo] password for smoser: $ mkdir lower upper mp $ sh -c 'echo hi > lower/f1.txt' $ sudo mount -t overlayfs -o lowerdir=/tmp/lower,upperdir=/tmp/upper overlay /tmp/mp $ sh -c 'cd mp && touch foo && ln foo bar' file link: user: PASS $ sudo sh -c 'cd mp && touch foo && ln foo bar' file link: root: PASS $ sh -c 'cd mp && mkfifo foo && ln foo bar' fifo link: user: PASS $ sudo sh -c 'cd mp && mkfifo foo && ln foo bar' fifo link: user: PASS == precise: 3.2.0-51-virtual == $ ls -ld . drwxrwxrwt 8 root root 4096 Aug 21 19:18 . $ sudo rm -Rf lower upper mp $ mkdir lower upper mp $ sh -c 'echo hi > lower/f1.txt' $ sudo mount -t overlayfs -o lowerdir=/tmp/lower,upperdir=/tmp/upper overlay /tmp/mp $ sh -c 'cd mp && touch foo && ln foo bar' file link: user: PASS $ sudo sh -c 'cd mp && touch foo && ln foo bar' file link: root: PASS $ sh -c 'cd mp && mkfifo foo && ln foo bar' ln: failed to create hard link `bar' => `foo': Operation not permitted fifo link: user: FAIL[1] $ sudo sh -c 'cd mp && mkfifo foo && ln foo bar' fifo link: user: PASS ** Attachment added: "testme.sh" https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1214500/+attachment/3781175/+files/testme.sh -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to lxc in Ubuntu. https://bugs.launchpad.net/bugs/1214500 Title: consistent failure with overlayfs and unix sockets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214500/+subscriptions -- Ubuntu-server-bugs mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
