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Just got luck to reproduce it again！.

All Recv-Q/Send-Q are empty, both controller side and compute node side.
--
root at 10.81.44.230:~# netstat -ant | grep -E 'Recv-Q|5672'

Proto Recv-Q Send-Q Local Address           Foreign Address         State

tcp        0      0 0.0.0.0:55672           0.0.0.0:*               LISTEN

tcp        0      0 127.0.0.1:57497         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:57499         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56775         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56877         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56866         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:57507         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56778         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56779         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56491         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:57508         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56777         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56776         127.0.0.1:5672
 ESTABLISHED
tcp        0      0 127.0.0.1:56493         127.0.0.1:5672
 ESTABLISHED
tcp6       0      0 :::5672                 :::*                    LISTEN

tcp6       0      0 10.81.44.230:5672       10.46.139.31:59842
 ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.178.20:51570
 ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:57508
ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.139.31:59843
 ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56775
ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.178.20:59565
 ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:57497
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56779
ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.139.171:54251
ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.178.20:54857
 ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:57499
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:57507
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56877
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56866
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56778
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56777
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56491
ESTABLISHED
tcp6       0      0 10.81.44.230:5672       10.46.139.171:54250
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56493
ESTABLISHED
tcp6       0      0 127.0.0.1:5672          127.0.0.1:56776
ESTABLISHED


[root at 10.46.178.20 log]# netstat -ant | grep -E 'Recv-Q|5672'
Proto Recv-Q Send-Q Local Address               Foreign Address
State
tcp        0      0 10.46.178.20:59565          10.81.44.230:5672
ESTABLISHED
tcp        0      0 10.46.178.20:59441          10.81.44.230:5672
ESTABLISHED

--
Qiu Yu
http://www.unicell.info



On Wed, Dec 19, 2012 at 8:59 PM, unicell <unicell at gmail.com> wrote:

> Thank you Wen Jian. I don't possess the environment anymore. :-(  So
> I'll try to follow your advice whenever it is reproducible.
>
> Posting this message here trying to collect more ideas, in case it happens
> again.
>
> --
> Qiu Yu
>
>
> On Wed, Dec 19, 2012 at 8:41 PM, Jian Wen <wenjian at canonical.com> wrote:
>
>> , the TCP connection is
>
>
>
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