April 2012 - Roundtable

SpamAssassin false positives on DATE_IN_FUTURE_96_Q?
by Gilbert E. Detillieux 23 Feb '16

23 Feb '16

I mentioned this problem at the last round-table session, but didn't get a solution, so I thought I'd post it here, just in case anyone has any suggestions to offer. I'm still seeing a whole bunch of false positives in SpamAssassin, since an update was installed in mid-September on a CentOS 5.7 system, for a rule called DATE_IN_FUTURE_96_Q, which is only supposed to be triggered when the "Date:" header has a date that is 4 days to 4 month ahead of the date in the "Received" header that has the _smallest_ difference in date. Here are the headers from the latest e-mail I've received with this false-positive. (I've stripped out irrelevant headers, for the sake of clarity and simplicity.) From topfivestories(a)messagent.itworldcanada.com Mon Nov 14 07:50:13 2011 Received: from mail.messagent.itworldcanada.com (mail.messagent.itworldcanada.com [207.112.10.80]) by palladium.cs.umanitoba.ca (8.13.8/8.13.8) with SMTP id pAEDoAxV028594 for <gedetil(a)cs.umanitoba.ca>; Mon, 14 Nov 2011 07:50:12 -0600 Date: Mon, 14 Nov 2011 08:50:13 -0500 X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,DATE_IN_FUTURE_96_Q, HTML_MESSAGE,RP_MATCHES_RCVD autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on palladium.cs.umanitoba.ca Note that I'm calling spamd via the spamass-milter on a system running sendmail. Note also, that in the above example, the only "Received" header was the one generated by my own server. (I've had other false positives, however, with multiple "Received" headers, all of which were within seconds of the time in the "Date" header.) Any ideas? -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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Load average under RHEL 6.x systems?
by Gilbert E. Detillieux 11 May '12

11 May '12

Howdy folks! I asked this at last night's meeting, as my "stumper of the month", but didn't get any solutions or leads. So, I thought I'd ask again here... After upgrading many of our systems, both workstations and servers, from CentOS 5.x to Scientific Linux 6.x, I'm seeing higher load averages on idle systems than I used to. Under EL5, loads would drop to zero and pretty much stay there most of the time for idles systems. Under EL6, the load might drop down to 0.1, but doesn't stay there for very long, and even on seemingly idle systems, I see loads at or near 1 (sometimes even higher than 1 on some of our servers). It's also intermittent, with load averages dropping and climbing on fairly short intervals (of a few minutes or so). Running top, iotop, ftop, iftop, etc. doesn't really point to any major culprits. I've even run PowerTop, and implemented some of its suggested improvements, but that didn't make a difference on load. Just wondering if anyone else has seen similar behaviour with hosts running Red Hat and/or Fedora distributions? Would moving to the "tickless" kernel have anything to do with it? (I.e. does it somehow affect the way load averages are calculated?) Or is it some system service that can be shut down? (If it is, it's not creating an obvious load on its own, that top or ftop would show, but it may be affecting something in the kernel...) Any suggestions? -- Gilbert E. Detillieux E-mail: <gedetil(a)muug.mb.ca> Manitoba UNIX User Group Web: http://www.muug.mb.ca/ PO Box 130 St-Boniface Phone: (204)474-8161 Winnipeg MB CANADA R2H 3B4 Fax: (204)474-7609

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Free TI-99
by Montana Quiring 30 Apr '12

30 Apr '12

Hello, Cleaning up the basement. If you come and pick it up at the UofM this week, it's yours. It's as is with no guarantee/warranty. :) Regards, -Montana Quiring

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... some late-night light-heartedness ...
by Dan Keizer 30 Apr '12

30 Apr '12

Well - I recall we've had this discussion before ... ... but, because I've been digging up some old information, I did some more checking .. the oldest email of mine that i could find has the following headers on it -- way back to May of 1983 .. sheesh .. 29 years ago ... now -- back to work .... Dan. Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!mit-eddie!ll-xn!ames!ucbcad!ucbvax!UOFMCC.BITNET!BUSU From: B...(a)UOFMCC.BITNET (Daniel Keizer) Newsgroups: comp.sys.atari.st Subject: UUDECODE/ENCODE etc. Message-ID: <8708242241.AA06541(a)ucbvax.Berkeley.EDU> Date: Mon, 24-Aug-87 17:13:00 EDT Article-I.D.: ucbvax.8708242241.AA06541 Posted: Mon Aug 24 17:13:00 1987 Date-Received: Tue, 25-Aug-87 06:38:56 EDT Sender: dae...(a)ucbvax.BERKELEY.EDU Organization: The ARPA Internet Lines: 16

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burn-in software
by Trevor Cordes 30 Apr '12

30 Apr '12

I've been having problems lately with vendors selling me shoddy H67 boards which freeze/crash/reboot. I'd like to start "burning-in" all boards I receive for 24+ hours to weed out the bad ones right away. What's the best software for doing this? Preferably free (or cheap). Ideally it would hammer the CPU (get it nice and hot) and on-CPU GPU (some 3D work). I don't really need to hammer the drives (wouldn't want to with SSD's anyhow!). It would be great if I could have both a live-CD bootable burn-in program and a Windows-installable one. I suppose in Windows any benchmark program that also tests video would be ok if it could be put on repeat mode. But most Windows programs that I know about are for-pay; but worse than that, for-pay per seat (and I may need to burn-in 100's of boards). Any ideas? Thanks!

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strange NTP problem on one of 3 peers
by Gilles Detillieux 29 Apr '12

29 Apr '12

I have a weird problem with clock drift that just started to happen today on one of my Linux systems. I was wondering if someone on the list has some NTP experience and could help me solve this puzzle. I have a group of 3 systems operating as peers, and they've been keeping time well for years. Yesterday I upgraded them from Scientific Linux 5.7 to 5.8 (an RHEL 5.8 clone like CentOS 5.8), and rebooted them to the latest kernel on SL 5.8, 2.6.18-308.4.1.el5. I rebooted 2 of them yesterday evening, and the last one I set an at job to reboot at 2:30 am. (It's our mail server so I didn't want to reboot it earlier.) This morning, I noticed this last system's clock was 4-5 minutes behind the others. I've stopped ntpd, reset the clock to the correct time, and restarted ntpd. I've done this twice already this morning, and each time, the clock starts slowly drifting backwards. The syslog entries from ntpd in /var/log/messages on the 2 other systems show fairly frequent occurrences of "synchronized to <IP>, stratum <n>", where n is usually 2 or 3. But for the mail server with the drifting clock, the only ntp sync logged this week was at 21:03:03 yesterday. The last ones before that were April 10 & April 4, i.e. very irregularly. The oldest log entries I have in /var/log/messages.4 show more regular syncs (at least 1-2 a day) up to March 31. So it's possible this problem existed for a while and had nothing to do with the updates yesterday, but this is the first time the drift got so bad it drew attention to itself (some file modification times got out of sync between this server and another system). I'd appreciate any ideas on how to tackle this problem. Gilles -- Gilles R. Detillieux E-mail: <grdetil(a)scrc.umanitoba.ca> Spinal Cord Research Centre WWW: http://www.scrc.umanitoba.ca/ Dept. Physiology, U. of Manitoba Winnipeg, MB R3E 0J9 (Canada)

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*Free to Choose* Your Pocket Reference - Only $4.99 - Two Days Only
by Gilbert E. Detillieux 17 Apr '12

17 Apr '12

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Call to order
by Brian Doob 11 Apr '12

11 Apr '12

I think every MUUG member should have a copy of this.... http://dl.dropbox.com/u/69806633/eh-hm.wav

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Get a Head Start on IPv6 Integration - Save 50% on Related Ebooks
by Gilbert E. Detillieux 09 Apr '12

09 Apr '12

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Opinion on digital tuner hardware
by Mike pfaiffer 08 Apr '12

08 Apr '12

I saw an article on Slashdot the other day which suggested it might be possible to get some hardware using the RTL2832U chipset for $11.00. A quick search of Google seems to indicate it is fairly well supported with Linux. Since the article was about Software Defined Radio (HF) rather than the TV part of the device I was wondering if anybody locally had tried it out... I would guess apart from the article, the only info I'd be able to get would be about the TV part. What are the ranges of the chipset? How reliable is it? One fellow from the Seniors Radio Club suggested a kit for around $20.00 which should have a similar range (minus the TV). Is the idea even worth following up? I think for around $11.00 it would be a good introduction to SDR and digital TV. Later Mike

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