Re: [BUG ext4?] Working tree getting out of date "spontaneously"

["Björn Steinbrink" <B.Steinbrink@gmx.de>]

On 2009.06.05 15:21:26 +0200, Björn Steinbrink wrote:
> On 2009.06.05 14:24:44 +0200, Björn Steinbrink wrote:
> > Hi,
> > 
> > can't make any sense out of this at all:
> > 
> > doener@atjola:git (master) $ git reset --hard HEAD@{1}
> > HEAD is now at b11cf09 Merge branch 'da/pretty-tempname'
> > doener@atjola:git (master) $ git update-ref refs/remotes/origin/master HEAD
> > 
> > doener@atjola:git (master) $ git pull
> > >From git://git.kernel.org/pub/scm/git/git
> >    b11cf09..6096d75  master     -> origin/master
> > Updating b11cf09..6096d75
> > Fast forward
> >  Documentation/RelNotes-1.6.3.2.txt     |   12 +++++-------
> >  Documentation/git.txt                  |    7 ++++++-
> >  contrib/completion/git-completion.bash |   12 ++++++++++--
> >  grep.c                                 |    6 +++++-
> >  4 files changed, 26 insertions(+), 11 deletions(-)
> > 
> > doener@atjola:git (master) $ git diff-index --name-only HEAD
> > doener@atjola:git (master) $ git diff-index --name-only --cached HEAD
> > 
> > *wait a minute, doing nothing*
> > 
> > doener@atjola:git (master) $ git diff-index --name-only HEAD
> > Documentation/RelNotes-1.6.3.2.txt
> > Documentation/git.txt
> > contrib/completion/git-completion.bash
> > grep.c
> 
> Hm, looks like this is not a git bug. Went back to 1.5.4, and even that
> shows the error. So I actually looked at the files, and indeed, the file
> in the working tree gets modified. stat(1) shows:
> 
> Right after the merge:
>   File: `grep.c'
>   Size: 16274           Blocks: 32         IO Block: 4096   regular file
> Device: fd03h/64771d    Inode: 5933481     Links: 1
> Access: (0644/-rw-r--r--)  Uid: ( 1000/  doener)   Gid: ( 1000/  doener)
> Access: 2009-06-05 15:02:14.000000000 +0200
> Modify: 2009-06-05 15:02:14.000000000 +0200
> Change: 2009-06-05 15:02:14.000000000 +0200
> 
> 60 seconds later:
>   File: `grep.c'
>   Size: 16274           Blocks: 32         IO Block: 4096   regular file
> Device: fd03h/64771d    Inode: 5933481     Links: 1
> Access: (0644/-rw-r--r--)  Uid: ( 1000/  doener)   Gid: ( 1000/  doener)
> Access: 2009-06-05 15:02:14.000000000 +0200
> Modify: 2009-06-05 15:02:14.000000000 +0200
> Change: 2009-06-05 15:02:48.000000000 +0200
> 
> So the ctime got modified. I don't have any fancy indexing stuff
> running, and inotify doesn't see any events either while the ctime is
> changed.
> 
> The only thing I changed lately was upgrading to 2.6.30-rc8 and going
> from ext3 to ext4. As the ctime change always seems to happen around 30
> seconds after the real change, I kind of suspect ext4 to be guilty.
> Ted, is that possible?
> 
> FS is mounted as:
> /dev/mapper/vg0-home on /home type ext4 (rw,noatime,nodiratime,barrier=0)

Hm, yup, seems to be ext4 related, doesn't happen on tmpfs.

Björn