Re: 2.6.36.2 - loop on read /proc/net/tcp

[Eric Dumazet]

Le mercredi 22 dÃcembre 2010 Ã 16:43 +0300, Alexey Vlasov a Ãcrit :
> Hi.
> 
> Has anyone seen such a bug at 2.6.36.2?
> # netstat -ntl
> Active Internet connections (only servers)
> Proto Recv-Q Send-Q Local Address           Foreign Address         State
> tcp        0      0 81.176.228.2:60608      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:8099       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:8099       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.7:8099       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:8100       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:8100       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:8101       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:8101       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:20037      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:8102       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:8102       0.0.0.0:*               LISTEN
> tcp        0      0 127.0.0.1:3399          0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:20040      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:38985      0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:873             0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:20041      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:20042      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:3306       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.3:3306       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.2:3306       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:9099       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:9099       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:20043      0.0.0.0:*               LISTEN
> tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:9100       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:9100       0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:20044      0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.5:33549      0.0.0.0:*               LISTEN
> ...
> First 30 lines are ok
> 
> but then go lines repeating in "eternal" loop:
> tcp        0      0 81.176.228.2:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.3:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.7:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.2:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.3:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.7:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.2:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.3:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.4:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.7:80         0.0.0.0:*               LISTEN
> tcp        0      0 81.176.228.2:80         0.0.0.0:*               LISTEN
> 
> # cat /proc/net/tcp
> ...
> It can hang an hour or so. but not always actually.

Ouch...

Hmm, yes, I think I can do something about it, thanks for the report



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