Bug 673111 - VDSM event loop can deadlock due to blocked write
Summary: VDSM event loop can deadlock due to blocked write
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: vdsm
Version: 6.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Dan Kenigsberg
QA Contact: yeylon@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2011-01-27 13:28 UTC by Daniel Berrangé
Modified: 2016-04-18 06:37 UTC (History)
6 users (show)

Fixed In Version: vdsm-4.9-47
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-08-19 15:13:25 UTC
Target Upstream Version:


Attachments (Terms of Use)

Description Daniel Berrangé 2011-01-27 13:28:32 UTC
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:

Comment 1 Daniel Berrangé 2011-01-27 13:30:10 UTC
Opps, wrong hyperlink. This is the correct one

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

Comment 3 Haim 2011-02-08 17:36:53 UTC
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


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