Messages in this thread | | | Date | Thu, 28 Jun 2012 11:07:12 -0700 | From | "" <> | Subject | Re: 3.5-rc3: BUG: Dentry still in use (1) [unmount of cgroup cgroup] |
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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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