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SubjectRe: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup cgroup]
Hello, Li.

On Thu, Jun 28, 2012 at 02:07:51PM +0800, Li Zefan wrote:
> > Hmm... fa980ca87d "cgroup: superblock can't be released with active
> > dentries" is supposed to have fixed that. Looking into it.
> >
>
>
> I think I know what happened here:
>
> umount
> deativate_super(sb)
> dput(subdir)
> subdir->d_count--
> d_release(subdir)
> deactivate_super(sb)
> shrink_dcache_for_umount(sb)
> BUG(root->d_count)!!
> root->d_count--

Can you please elaborate a bit? I'm not really following? Where does
the last root->d_count-- come from?

> I use this script to reproduce the bug:
>
> mount -t cgroup -o cpu xxx /mnt
> mkdir /mnt/sub
> sleep 100 < /mnt/sub &
> kill $!
> wait $!
> rmdir /mnt/sub
> umount /mnt

Unfortunately, this doesn't reproduce the bug here either. :(

Thanks.

--
tejun


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