[Bugme-new] [Bug 30432] New: rmdir on cgroup can cause hang tasks

[KAMEZAWA Hiroyuki]

On Mon, 7 Mar 2011 13:58:03 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com> wrote:

> On Fri, 4 Mar 2011 18:01:57 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com> wrote:
> 
> > On Fri, 4 Mar 2011 17:28:15 +0900
> > KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com> wrote:
> > This seems....
> > > ==
> > > static void mem_cgroup_start_move(struct mem_cgroup *mem)
> > > {
> > > .....
> > > 	put_online_cpus();
> > > 
> > >         synchronize_rcu();   <---------(*)
> > > }
> > > ==
> > > 
> > 
> > But this may scan LRU of memcg forever and SysRq+T just shows
> > above stack.
> > 
> > I'll check a tree before THP and force_empty again
> 
> Hmm, one more conern is what kind of file system is used ?
> 
> Can I see 
>  - /prco/mounts
> and your .config ?
> 
> If you use FUSE, could you try this ?
> 
> I'll prepare one for mmotm.
> 

Sorry, this version may contain hung-up bug...
I'll start from fix for mmotm and backport it.

Thanks,
-Kame