On Thu, May 10, 2007 at 07:46:33AM -0700, Jeremy Fitzhardinge wrote: > David Chinner wrote: > > On Wed, May 09, 2007 at 05:54:09PM -0700, Jeremy Fitzhardinge wrote: > > > >> David Chinner wrote: > >> > >>> Suspend-resume, eh? > >>> > >>> There's an immediate suspect. Can you test this specifically for us? > >>> i.e. download a known good file set, do some stuff, suspend, resume, > >>> then check the files? If it doesn't show up the first time, can > >>> you do it a few times just to rule it out? > >>> > >> Well, I've been doing suspend-resume with xfs for a while without > >> problems; the problems seem to be recent and easily repeatable. Which > >> just means that it could be a new suspend-resume problem, of course. > >> > > > > Ok. I'm just trying to find a relatively simple test case for the > > problem - seeing as you seem to be able to reliably reproduce this > > we should be able to work out the trigger... > > > > OK, I was able to reproduce it reliably with a script with did basically: > > for i in `seq 20`; do > hg clone -U --pull a b-$i > hg verify b-$i # always OK > umount /home > sleep 5 > mount /home > hg verify b-$i # often found truncated files > done > > > No suspend/resumes involved. The trees are linux kernel ones, so fairly > large, but small enough to fit entirely in core. My script also > captured xfs_bmap before/after output for files which had tended to be > corrupted in the past, but unfortunately none of them got corrupted in > these tests. But I do have all the trees lying around to extract more > detail for if you like. > > Interestingly, the corruption happened in each case around the same > place in the tree, often in the sata drivers. I wonder if that was just > related to the timing of this script.
I guess this pins it as an XFS problem pretty solidly. This test looks like it should consist solely of open-for-append and write on about 20k files in the target directory. Because of the --pull, no hardlinks are involved. It shouldn't be all that different from doing tar cf - a | tar xf - b. The files get visited in alphabetical order, so the start of the corruption may be telling. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
