Description of problem:
Huge leaks in caribou (and nautilus) when adding/removing block devices.

I was testing creating many LVs on a system with running gnome session. I expected memory to be stressed a bit but did not expect caribou (and nautilus) consuming 2.86GB (and 6.46GB) or RAM.

Until now I did not know there is a caribou. Now I do know, but do not understand why a "text entry and UI navigation" would have anything to do with disks. But I am sure it should not consume nearly 3GB of RAM.

Version-Release number of selected component (if applicable):
Running RHEL7.2:
caribou-0.4.16-1.el7.x86_64
nautilus-3.14.3-7.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. for i in $(seq 1500); do lvcreate -kn -s $VG/$THINLV; done

Actual results:
Wasted 9+ GB or RAM.

Expected results:
There should be some saner limit what the application consumes.
Especially when doing "nothing".

Additional info:

> top - 13:22:11 up 26 days,  2:29,  8 users,  load average: 0.18, 0.29, 0.37
> Tasks: 3776 total,   1 running, 3770 sleeping,   5 stopped,   0 zombie
> %Cpu(s): 27.9 us,  4.3 sy,  0.2 ni, 67.6 id,  0.1 wa,  0.0 hi,  0.0 si,  0.0 st
> KiB Mem : 15889328 total,   165116 free, 14954932 used,   769280 buff/cache
> KiB Swap:  8388604 total,  1828152 free,  6560452 used.   204764 avail Mem 
> 
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
> 19891 mrtianc   20   0 8001360 6.462g   1248 S   0.0 42.6  24:14.70 nautilus
> 19721 mrtianc   20   0 3839744 2.866g    904 S   0.0 18.9  14:04.27 caribou
> 25805 mcsontos  20   0 2028732 658272  15216 S   0.0  4.1   9:00.27 firefox

Even deactivating LVs causes both nautilus and caribou leaking a lot.

After restarting gnome, the programs were fine, until I started manipulating the LVs.
After deactivating 1000LVs it now looks like this:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                          
28616 mrtianc   20   0 2616316 1.698g  16968 S   0.0 11.2   5:59.90 nautilus                                                         
20996 mcsontos  20   0 2597992 871032  31120 S   0.7  5.5 206:29.34 firefox                                                          
27886 mrtianc   20   0 1314972 751520   5044 S   0.0  4.7   2:58.94 caribou

Nautilus and caribou were running at full speed for 6 minutes, nautilus consuming 100% CPU, and caribou "only" 50%.

Reactivating all these 1000 LVs gets both applications running again.

The fact deactivating devices is causing memory going up suggests there is a huge leak - over 1MB in nautilus and 0.7MB in caribou for each activated/deactivated LV.