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SubjectRe: cgroup: rmdir() does not complete
* Mark Hills <mark@pogo.org.uk> [2010-09-09 11:01:45]:

> On Thu, 2 Sep 2010, KAMEZAWA Hiroyuki wrote:
>
> [...]
> > But hmm...it's curious who holds mutex and what happens.
>
> I have a system showing the failure case (but still do not have a way to
> reliably repeat it)
>
> Here are the two processes:
>
> 23586 pts/0 RL+ 5059:18 /net/homes/mhills/tmp/soaked-cgroup
> 23685 pts/6 DL+ 0:00 /net/homes/mhills/tmp/soaked-cgroup
>
> 23586 spends almost all of its time in 'RL+' status, occasionally it is
> seen in 'DL+' status.
>
> From my analysis before, both are blocked on rmdir(), but one is spinning,
> holding the lock on the /cgroup, and the other is waiting for the lock. If
> I strace 23586 then the rmdir() fails with EINTR.
>

Any chance you can compile with debug cgroup subsystem and get
information from there?

--
Three Cheers,
Balbir


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