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Description of problem:
There is a flaw in the libvirt python demo program for events which can lead to a deadlock:
 
  http://www.redhat.com/archives/libvir-list/2011-January/msg00921.html

VDSM has a copy of this code as libvirtev.py and so should apply this same fix too.

Version-Release number of selected component (if applicable):
vdsm-4.9-12.2.x86_64

How reproducible:
Non-deterministically

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Opps, wrong hyperlink. This is the correct one

http://www.redhat.com/archives/libvir-list/2011-January/msg01131.html

after talking to Dan, verified the bug as follows:

- started about 30 vms 
- killed all vms using pkill 
- all qemu processes died after a seconds

[root@rhev-i32c-01 tmp]# pgrep qemu
6902
16297
47818
65964
66246
66435
66817
67058
67451
67779
68109
68419
68849
69090
69495
69941
70242
[root@rhev-i32c-01 tmp]# pkill qemu
[root@rhev-i32c-01 tmp]# pgrep qemu
47818
68849
69090
69941
70242
[root@rhev-i32c-01 tmp]# pgrep qemu

vdsm-4.9-47.el6.x86_64