Michael Johnson - MJ:
> I think I know why you were unable to recreate the problem. It appears to
> only occur in attempt the test case from a directory contained within the
> aufs mount point, and not the base of the mount itself. In fact, if the
> directory you are in exists in all branches, the problem does not occur. I
> have verified that this problem does not occur when the underlying
> filesystes are all ext4, but it does occur when they are all btrfs.
Hmm...
Still I cannot reproduce the problem.
Linux jrofr 3.13.11.6aufsD #8 SMP Mon Feb 2 13:56:32 JST 2015 x86_64 x86_64
x86_64 GNU/Linux
/dev/sda15 / btrfs rw,relatime,space_cache 0 0
+ sudo mount -t aufs -o br=/rw:/ro=rw none /u
[ 51.057477] aufs 3.13-20140303
+ sudo mkdir -p /u/dir1/dir2/dir3
+ cd /u/dir1
+ sudo rm -fr dir2
+ ls
(no error)
> I can try building a new aufs module, but I will need some directions to
> get that started.
- get all source files of ubuntu trusty and build as it is
$ git clone git://kernel.ubuntu.com/ubuntu/ubuntu-trusty.git
$ cd ubuntu-trusty
$ fakeroot make-kpkg --uc --us --config silentoldconfig configure
$ fakeroot make-kpkg --uc --us --append_to_version -aufsD --revision `date
+%y%m%d%H%M` kernel_image
(lots of time and space are necessary)
- install the built kernel pkg
$ dpkg -i ../linux-image-....deb
- reboot
- make sure you can receive "kern.debug" logs
$ logger -p kern.debug testing
check the kernel log
- reproduce the problem, in order to make sure
check the kernel log
- enable debugging
$ cd ubuntu-trusty
$ make menuconfig
enable CONFIG_AUFS_DEBUG
(menu) "Ubuntu Supplied Third-Party Device Drivers"
--> "Aufs (Advanced multi layered unification filesystem) support"
--> "Debug aufs"
- re-run "make-kpkg ... kernel_image" and re-install the pkg
- reboot
- reproduce the problem
check the kernel log
- apply the patch in
http://www.mail-archive.com/aufs-users@lists.sourceforge.net/msg04991.html
- re-run "make-kpkg ... kernel_image" and re-install the pkg
- reboot
- reproduce the problem
check the kernel log
> If it would be helpful, I can figure out have to give you ssh access to
> this VM if you want to provide me with an SSH public to add.
Can I reboot the system and check the log anytime via ssh?
If so, I will send my public key privately.
J. R. Okajima
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