At 11:33 AM 8/29/2010, Andre Oppermann wrote:
On 29.08.2010 16:09, Mike Tancsa wrote:
After upgrading to a recent STABLE, I have been seeing the
following sporadic errors
Aug 28 04:15:15 smarthost2 kernel: TCP: [xx.yy.165.120]:53617 to
[xx.yy.164.50]:25; syncache_socket:
Socket create failed due to limits or memory shortage
this is with
FreeBSD 8.1-STABLE #7: Wed Aug 25 15:32:05 EDT 2010
and the previous kernel was from July 20th.
The odd thing is that the error is triggered from a RELENG_6 host
only it would seem. I noticed
there are a number of syncache and tcp updates to RELENG_8, is it
possible this is related ? I dont
have any specific tweaks in /etc/sysctl.conf
other than
net.inet.tcp.log_in_vain: 1
net.inet.udp.log_in_vain: 1
The log_in_vain sysctl would cause the logging of syncache errors
as well (net.inet.tcp.log_debug). This was a POLA violation and
I've separated them on August 27 on 8-stable. So if you update
you won't see them anymore. That doesn't change the fact that
the socket create failed though.
If it only happens from a RELENG_6 box it probably is a problem
with port re-usage by RELENG_6. The difficulty is that sonewconn()
fails and doesn't return an error code. Hence it may be one of
listen queue limits reached, memory shortage or a problem with
inserting the inpcb into the hash lists.
Actually, I think I might have found the issue. I was focusing on
the "memory" part not the limits. The 'RELENG_6 only' is just a
fluke as thats a box that sends a lot of email to this particular
server. It turns out, sendmail was rate limiting the server
sm-mta[25923]: deferring connections on daemon IPv4: 8 per second
and somehow syncache is aware/logs this now where as it did not before ?
---Mike
--
Andre
--------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, m...@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike
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