linux-kernel - suspected regression in 3.0.28 - applications having problems binding to ports

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Date:	Fri, 13 Apr 2012 20:18:56 +0200
From:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	nikola.ciprich@...uxbox.cz
Subject: suspected regression in 3.0.28 - applications having problems
 binding to ports

Hi,

I'd like to report following suspicious behaviour of 3.0.27 kernel.

On one of our production boxes, after upgrading from 3.0.26 to 3.0.27,
applications started to behave weird after ~1 day uptime.
Squid started reporting problems binding to port, nagios misbehaved, etc.
I was forced to revert to 3.0.26. We tried to reproduce the problem but were unsuccessful.
After ~1 week without problems with 3.0.26, I tried upgrading this production box to 3.0.27
again to see what happens and the problem appeared again after about one day.

imap started reporting problems:
EMAIL DELIVERY CRITICAL - imap failed: IMAP RECEIVE CRITICAL - Could not connect to A.B.C.D port 993: IO::Socket::INET6 configuration

same for squid:
commBind: Cannot bind socket FD 21 to 0.0.0.0: (98) Address already in use

nagios processes went totally nuts.

There was no other change except for the kernel upgrade.
The box is x86_64 quad CPU 4GB machine, what might be important, we're using
IPv6 as well.
I don't see any suspicious (at least to me) patch between 3.0.26 and 3.0.27.
Since it seems to take quite a long to reproduce, I haven't tried bisect yet, first
wanted to ask - hasn't anyone experienced similar problems?

thanks a lot in advance!

with best regards

nik

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