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 17:35:48 +0100
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Dne 27.11.2014 v 17:27 Gianluca Cecchi napsal(a):
> On Thu, Nov 27, 2014 at 5:05 PM, Zdenek Kabelac <zkabelac@redhat.com
> <mailto:zkabelac@redhat.com>> wrote:
>
>
>
>     So it's likely a time to look through 'dmesg' output if there is not
>     something suspicious ?
>
>     Kernel bug/report showing some error behavior which may lead to openned
>     descriptor being leaked?
>
>     Is there anything in  /sys/block/dm-49/holders ?
>
>     cat /proc/self/mountinfo | grep 253:49 ?
>
>
>
> I tried before, but found nothing
>
> [root@orapr2 ~]# ll /sys/block/dm-49/holders
> total 0
>
> [root@orapr2 ~]# cat /proc/self/mountinfo | grep 253:49
> [root@orapr2 ~]#
>

As I've been pointed our cgroups could play some role -

so lets repeat with  /proc/*/mountinfo

Also check  /proc/swaps ?

Zdenek