@bruce-lucas OK I have reproduced this with the latest 3.17-rc kernel. So most likely this is an upstream issue. However I'll start testing previous versions to see if this is a regression between 3.10,3.11; this will help us zero in on the code changes that may have introduced this behavior.
I do get the same error on my runs: [ 176.092640] dm-0: WRITE SAME failed. Manually zeroing. I'll investigate this in parallel. ** Tags added: kernel-bug-exists-upstream ** Also affects: linux (Ubuntu Trusty) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1371591 Title: file not initialized to 0s under some conditions on VMWare To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1371591/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs