David O'Riley posted on Tue, 10 Sep 2013 18:04:20 +0100 as excerpted: > I have been using ubuntu-gnome 13.04 for a couple of week with no issue. > After a power failure my system fails to boot, error in rootfs. > > If I boot from a live CD and try to mount /dev/sda6 the system crashed. > > I have also tried btrfsck /dev/sda6 which gives the below error, > > [...] *** Error in `btrfsck': double free or corruption [...] > > Is there anything you would advise to try next? Just a user and list regular, here, with a generic answer as I don't claim to read backtraces, etc... The below link is to an archived post with the general btrfs repair steps and the recommended order in which to try them. (This should be added to the wiki as well, but I haven't checked to see if it has been.) http://permalink.gmane.org/gmane.comp.file-systems.btrfs/27999 However, before that, please do try with a current kernel and btrfs-tools -- I don't know how old the ubuntu kernel and tools are, but btrfs is still under heavy development and labeled experimental, which means anyone running it is choosing to be a tester, and each new kernel series brings bug fixes. That means, if you're more than a single kernel stable series behind mainline you really ARE missing potentially critical bugfixes and really ARE unnecessarily risking your data, in addition to being able to provide rather less useful information when things do go wrong with your testing, than you could provide with a current kernel. 3.11 was recently released and we're in the pre-3.12-rc1 feature-commit phase, so ideally you'll be running 3.11 by now. And I know for sure there were bug fixes in 3.11 that have helped people who were running earlier kernels so I'd definitely try it. However, you should DEFINITELY be running at LEAST 3.10 series by now if you're testing btrfs, and if you're not prepared to do that, you should really reconsider whether running a developmental filesystem such as btrfs is appropriate for you at this point in the first place. Same with btrfs-tools. The latest full release is 0.19, but that's VERY old now. There's a 0.20-rc1 out too, but even that's now old (from 2012 I believe, and 358 commits behind). For testing btrfs, you should really be running a reasonably new (definitely post 0.20-rc1) git snapshot (the latest commit seems to be from July 5, v0.20-rc1-358-g194aa4a, so ideally that commit or a snapshot dated after that), as development occurs on other branches and is merged to master only when it's ready, so current btrfs-tools git-master should always be the best version available. Meanwhile, if you weren't aware of it yet, here's the wiki. It's full of information (particularly the documentation section) you will almost certainly find rather useful as a btrfs tester! =:^) https://btrfs.wiki.kernel.org -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
