This was fixed by the commit below which was commited in v3.2-rc4, this is therefore fixed for precise and later at the very least:
commit b772a86ea6d932ac29d5e50e67c977653c832f8a Author: Li Zefan <l...@cn.fujitsu.com> Date: Mon Nov 28 16:43:00 2011 +0800 Btrfs: fix oops when calling statfs on readonly device Closing out fixed. ** Changed in: linux (Ubuntu) Status: In Progress => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/816770 Title: kernel BUG when mounting btrfs filesystem from read-only (R/O) media To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/816770/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs