Daniel Smedegaard Buus:
> Yes, I installed that from the distro repository. I haven't manually
> added any PPA or something like that.
Ok then I'd ask you to post the output of
# strace -f mount -v -t aufs -o br:/root/a:/root/b none /root/c
> > - /proc/mounts
I understand your original branches are zfs, and your /root/a and /root/b
are btrfs. Personaly I am unfamiliar to both of them. It was a long time
ago to test them by myself. If you can, I'd suggest you to try another
fs-type as branch. If it suceeds, then it will be a good narrowing-down
and we should check zfs or btrfs first.
> # uname -ar
> Linux disneyland 3.16.0-28-generic #38-Ubuntu SMP Fri Dec 12 17:37:40
> UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
>
> http://packages.ubuntu.com/utopic/linux-source-3.16.0
:::
> # dmesg|grep aufs
> [ 386.815833] aufs 3.x-rcN-20140707
Again ubuntu kernel takes very old version of aufs. Sigh...
Here are the list of bugfixes in aufs kernel module after Jul 7 2014
(excluding new features). Curretnly I don't know whether these are
related to your problem or not.
de1e9af 2015-01-02 aufs: possible bugfix, signedness of d_count
7a39204 2014-10-16 aufs: bugfix, fix the returning size of the branch attr
8fcaafe 2014-09-09 aufs: support for AT_EMPTY_PATH/LOOKUP_EMPTY
11ee438 2014-08-31 aufs: bugfix, get a removed dentry from an inode
2d9b3b9 2014-08-21 aufs: possible bugfix, temporary d_inode
9b03b75 2014-08-21 aufs: bugfix, instantiate-revalidate race
14a0cee 2014-08-07 aufs: bugfix, hfile test in br_del_file()
d0be72c 2014-07-31 aufs: bugfix, use id instead of index to identify a branch
cd4740b 2014-07-26 aufs: si_files has all opened files
6d05984 2014-07-26 backport: aufs: for linux-3.13, s_files is gone and si_files
has come
dbb0c00 2014-07-25 aufs: possible bugfix, ptr in an array
0a0de13 2014-07-25 aufs: bugfix, stop passing an error code to dput()
d306ff4 2014-07-25 aufs: allow deleting a branch who has an opened dir
bed6fd0 2014-07-18 aufs: bugfix, restore the lost unlock in an error path
7bc5ccc 2014-07-17 aufs: new ioctl BRINFO
Also I've found 'aufs-tools' pkg in ubuntu utopic is very old,
20130722. Latest version has several fixes, but either I am not sure
this is related to the problem.
Anyway let's see the output of strace.
J. R. Okajima
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