That's good news, so this is fixed upstream. We can perform a "Reverse" bisect to identify the exact commit that fixes this.
First, can you test the latest upstream 3.19 kernel to see if the fix in mainline was already sent to stable? It can be downloaded from: http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19.8-vivid/ ** Tags added: performing-bisect -- 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/1454796 Title: btrfs blocks root filesystem mount on 15.04 Status in linux package in Ubuntu: Confirmed Bug description: Powered on my laptop (XPS 13) and it newer booted up. Attaching screenshots showing btrfs blocking mounting. Kernel 3.19.0-15-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454796/+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
