From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zdenek Kabelac <zkabelac@redhat.com>
Subject: Re: Unable to deactivate lv,
	pehaps due to semaphore problem...
Date: Thu, 27 Nov 2014 18:04:01 +0100
Message-ID: <54775981.1020803@redhat.com>
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Dne 27.11.2014 v 17:46 Gianluca Cecchi napsal(a):
> On Thu, Nov 27, 2014 at 5:35 PM, Zdenek Kabelac <zkabelac@redhat.com
> <mailto:zkabelac@redhat.com>> wrote:
>
>
>
>     As I've been pointed our cgroups could play some role -
>
>
> mhh I don't think I'm using Control Groups at all....
> [root@orapr2 ~]# rpm -qa |grep group
> [root@orapr2 ~]#
>
> [root@orapr2 ~]# ll /etc/cgconfig.conf
> ls: cannot access /etc/cgconfig.conf: No such file or directory
>
>
>     so lets repeat with  /proc/*/mountinfo
>
>
> [root@orapr2 ~]# cat /proc/*/mountinfo > /tmp/proc.log
> cat: /proc/33700/mountinfo: Invalid argument
> cat: /proc/33735/mountinfo: No such file or directory
>
> [root@orapr2 ~]# wc -l /tmp/proc.log
> 55050 /tmp/proc.log
>
>   [root@orapr2 ~]# grep 253:49 /tmp/proc.log
> [root@orapr2 ~]#
>
>
>     Also check  /proc/swaps ?
>
>
>   [root@orapr2 ~]# cat /proc/swaps
> FilenameTypeSizeUsedPriority
> /dev/sda2                               partition167772120-1
>

So I'm afraid you will need to open a RHEL support ticket to get all the 
diagnostic  (sosreport)  -  since if this is production system,
all further advices may lead to some problems.

Zdenek