Re: 4.7.0-rc7 ext4 error in dx_probe

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On Fri, Aug 05, 2016 at 08:11:36PM +0200, Johannes Stezenbach wrote:
> On Fri, Aug 05, 2016 at 10:02:28AM -0700, Darrick J. Wong wrote:
> > 
> > When you're back on 4.7, can you apply this patch[1] to see if it fixes
> > the problem?  I speculate that the new parallel dir lookup code enables
> > multiple threads to be verifying the same directory block buffer at the
> > same time.
> > 
> > [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/fs/ext4/inode.c?id=b47820edd1634dc1208f9212b7ecfb4230610a23
> 
> I added the patch, rebuilt and rebooted.  It will take some time
> before I'll report back since the issue is so hard to reproduce.

FWIW, so far the issue didn't appear again after I applied
the patch to 4.7.0, and I stressed it a bit with repo syncs,
AOSP builds, rsync backups etc.

Johannes
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