if cgmanager is restarted, this problem occurs.

2014-11-22 22:32:45.543+0000: 18448: error : cgm_dbus_connect:76 : cgmanager: 
Error pinging manager: Did not receive a reply. Possible causes include: the 
remote application did not send a reply, the message bus security policy 
blocked the reply, the reply timeout expired, or the network connection was 
broken.
process 18397: The last reference on a connection was dropped without closing 
the connection. This is a bug in an application. See dbus_connection_unref() 
documentation for details.
Most likely, the application was supposed to call dbus_connection_close(), 
since this is a private connection.
(null):alloc.c:315: Assertion failed in nih_free: ptr != NULL
Segmentation fault (core dumped)
root@nubo-10:/var/crash/x# cgm ping
<returns ok, cgmanager is up>

 ... again ...
2014-11-22 22:34:47.076+0000: 19701: error : cgm_dbus_connect:76 : cgmanager: 
Error pinging manager: Connection is closed
(null):dbus_error.c:69: Unhandled error from nih_dbus_error_raise: Connection 
is closed
Segmentation fault (core dumped)

[Switching to Thread 0x7fe482ffd700 (LWP 21863)]
0x00007fe49a778d27 in __GI_raise (sig=sig@entry=6) at 
../nptl/sysdeps/unix/sysv/linux/raise.c:56
56      ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  0x00007fe49a778d27 in __GI_raise (sig=sig@entry=6) at 
../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007fe49a77a418 in __GI_abort () at abort.c:89
#2  0x00007fe4986fd538 in cgmanager_get_pid_cgroup_sync () from 
/lib/x86_64-linux-gnu/libcgmanager.so.0
#3  0x00007fe49ad9102b in cgm_controller_exists (controller=0x7fe49af1566b 
"name=systemd") at /build/buildd/libvirt-1.2.8/./src/util/cgmanager.c:296
#4  0x00007fe49ad88a3b in cg_get_cgroups (group=<optimized out>) at 
/build/buildd/libvirt-1.2.8/./src/util/vircgroup.c:374
#5  virCgroupDetectMounts (group=0x552e) at 
/build/buildd/libvirt-1.2.8/./src/util/vircgroup.c:412
#6  0x00007fe49ad89c53 in virCgroupDetect (parent=<optimized out>, 
path=<optimized out>, controllers=<optimized out>, pid=<optimized out>, 
group=<optimized out>)
    at /build/buildd/libvirt-1.2.8/./src/util/vircgroup.c:729
#7  virCgroupNew (pid=21806, path=0x7fe49af62dd8 "", parent=0x0, 
controllers=-1, group=0x7fe482ffd700) at 
/build/buildd/libvirt-1.2.8/./src/util/vircgroup.c:1263
#8  0x00007fe49ad89ec7 in virCgroupNewDetectMachine (name=0x7fe4842ef770 
"instance-0000152c", drivername=0x7fe48b33affb "qemu", pid=21806, 
partition=0x7fe4841b9400 "/machine", controllers=-2097162496, 
    group=0x7fe484309250) at 
/build/buildd/libvirt-1.2.8/./src/util/vircgroup.c:1782
#9  0x00007fe48b2baec5 in qemuConnectCgroup (driver=<optimized out>, 
vm=0x7fe4842c75d0) at /build/buildd/libvirt-1.2.8/./src/qemu/qemu_cgroup.c:781
#10 0x00007fe48b2cf447 in qemuProcessReconnect (opaque=0x552e, 
opaque@entry=0x7fe48431c700) at 
/build/buildd/libvirt-1.2.8/./src/qemu/qemu_process.c:3322
#11 0x00007fe49adda94e in virThreadHelper (data=<optimized out>) at 
/build/buildd/libvirt-1.2.8/./src/util/virthread.c:197
#12 0x00007fe49ab0f0a5 in start_thread (arg=0x7fe482ffd700) at 
pthread_create.c:309
#13 0x00007fe49a83c84d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

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https://bugs.launchpad.net/bugs/1367702

Title:
  libvirt-bin terminated unexpectedly

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