Nelson Elhage, thank you for reporting this and helping make Ubuntu better.
Please execute the following command only once, as it will automatically gather debugging information, in a terminal: apport-collect 1445664 When reporting bugs in the future please use apport by using 'ubuntu- bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs. ** Tags added: regression-release utopic ** No longer affects: linux-lts-vivid (Ubuntu) ** Package changed: linux-lts-utopic (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-lts-utopic in Ubuntu. https://bugs.launchpad.net/bugs/1445664 Title: kernel 3.16 breaks POSIX extended ACLs over NFS Status in linux package in Ubuntu: Incomplete Bug description: I have a development environment that uses Vagrant with NFS shares to a Trusty development VM from OS X laptops. After the upgrade to the HWE kernel 3.16, installing Ruby gems into the NFS mount inside the VM failed because of install(1) failing with permission errors. Debugging revealed that it's trying to set POSIX extended ACLs using setxattr(); On 3.13 this operation failed with EOPNOTSUPP (the server does not support extended ACLs), but on 3.16 it fails with EPERM, even if the NFS mount is explicitly mounted with "noacl". Debugging with ftrace and source diving suggests that kernel 3.16 refactored the POSIX extended ACL code so that before the call even hits the NFS layer, it passes through a generic permission-check layer. It appears that that layer is not aware of NFS UID remapping, and so fails the call regardless of what the server would have done. A simple test case is `install -c -m 0755 <some file> <some path in an NFS mount>`, which will succeed on 3.13 and fail on 3.16. The broken system is: vagrant@packer-vmware-iso:~$ lsb_release -a; uname -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.2 LTS Release: 14.04 Codename: trusty Linux packer-vmware-iso 3.16.0-34-generic #47~14.04.1-Ubuntu SMP Fri Apr 10 17:49:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1445664/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp