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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1214500 Title: consistent failure with overlayfs and unix sockets Status in “linux” package in Ubuntu: Incomplete Status in “lxc” package in Ubuntu: New Bug description: Seems like overlayfs and unix sockets are not playing well. It might be racy, as it fails consistently on my laptop with an SSD, whereas for smoser it only failed a single time. Steps to reproduce: REL="precise" $ sudo lxc-create -n source-$REL-amd64 -t ubuntu-cloud -- \ --release=$REL --arch=amd64 ## clone via overlayfs ## $ sudo lxc-clone --snapshot -B overlayfs -o source-$REL-amd64 -n $REL-overlayfs-01 $ sudo lxc-start -n $REL-overlayfs-01 ### inside ### $ sudo apt-get update && sudo apt-get install supervisor -y $ sudo service supervisor stop $ sudo sed -i.dist 's,var/run/*supervisor.sock,srv/supervisor.sock,' /etc/supervisor/supervisord.conf $ sudo service supervisor start $ sudo supervisorctl maintail unix:///srv/supervisor.sock refused connection To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214500/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
