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Postings from August 2008
In-Reply-To: Message from jm@jmason.org (Justin Mason)
of "Fri, 01 Aug 2008 11:03:59 BST." <20080801100359.32DEE30C0B1@jmason.org>
>Tim Bunce writes:
>> On Thu, Jul 31, 2008 at 04:15:49PM -0600, Tom Christiansen wrote:
>>>
>>> I do have another Perl-spin bug/problem related, but I am pretty sure
>>> this is some pessimal combo of input data and processing code. Here's
>>> an example of it:
>>>
>>> UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
>>> 0 2463 3795 0 2 20 44920 10020 poll I ?? 14:42.02 perl5.10.0: spamd child (perl5.10.0)
>>>
>>> Nearly 15 minutes CPU time to process one message?!
>Note that spamd reuses forked children, so that process has probably
>processed more than 1 msg.
Oh, so that might explain pid 3795 then. Its WCHAN is poll, meaning I
presume, select, waiting on servicing another request from its SA daemon
master. (The blacklisters' polls are trailing their log files.)
Still, that's a lot of RSS, eh?
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
0 3795 1 0 2 20 30640 2616 poll Is ?? 1:51.43 perl5.10.0: /usr/local/bin/spamd -m 8 -d -p 4321 (perl5.10.0)
101 12053 21910 0 2 20 380 732 fifow I ?? 0:00.19 perl: sigrand (perl)
0 12686 3795 0 2 20 39012 26880 poll I ?? 6:30.87 perl5.10.0: spamd child (perl5.10.0)
0 21364 3795 0 2 20 33364 1100 poll I ?? 0:29.48 perl5.10.0: spamd child (perl5.10.0)
101 14990 6699 0 10 20 172 4 - T p0 0:00.04 /usr/bin/perl /home/tchrist/scripts/mail ja
0 1663 3969 0 2 20 2540 1152 poll I p1 0:14.71 /usr/local/bin/perl /home/tchrist/scripts/blacklist-imposters-smtp /var/log/maillog.0.gz /var/log/maillog.1.gz /var/log/maillog.2.gz /var/log/maillog.3.gz /var/log/maillog.4.gz /var/log/maillog.5.gz /var/log/maillog.6.gz /var/log/maillog.7.gz
0 12917 3969 0 2 20 2524 1160 poll I p1 1:38.32 /usr/local/bin/perl /home/tchrist/scripts/blacklist-imposters-spamd /var/log/daemon.0.gz /var/log/daemon.1.gz /var/log/daemon.2.gz /var/log/daemon.3.gz /var/log/daemon.4.gz /var/log/daemon.5.gz /var/log/daemon.6.gz /var/log/daemon.7.gz
Oh, no that's not it. Grepping on spamd yields:
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
62 16243 1 22 10 20 9800 1648 nanosl Is ?? 39:19.71 spamd: (pf <spamd-white> update) (spamd)
62 8872 16243 0 2 20 15872 9504 select I ?? 22:11.38 /usr/libexec/spamd -v -5 -g
62 24330 16243 0 -6 20 8492 368 piperd I ?? 0:22.01 spamd: (/var/db/spamd update) (spamd)
0 3795 1 0 2 20 30640 2616 poll Is ?? 1:51.66 perl5.10.0: /usr/local/bin/spamd -m 8 -d -p 4321 (perl5.10.0)
0 12686 3795 13 2 20 39348 28172 poll I ?? 6:39.63 perl5.10.0: spamd child (perl5.10.0)
0 21364 3795 0 2 20 33364 1100 poll I ?? 0:29.48 perl5.10.0: spamd child (perl5.10.0)
101 7458 6699 0 28 20 1524 4 - RV p0 0:00.00 grep spamd (tcsh)
0 12917 3969 0 2 20 2524 1160 poll I p1 1:38.48 /usr/local/bin/perl /home/tchrist/scripts/blacklist-imposters-spamd /var/log/daemon.0.gz /var/log/daemon.1.gz /var/log/daemon.2.gz /var/log/daemon.3.gz /var/log/daemon.4.gz /var/log/daemon.5.gz /var/log/daemon.6.gz /var/log/daemon.7.gz
There are different WCHANs for poll and select.
And yes, those are two very different flavors of spamd. Just
wanted to check to see for sure whom to SIGkick, howsoever
harmless SIGUSR2 might (or mightn't) be.
>> My usual first approach is something like
>>
>> $SIG{USR2} = \&Carp::cluck; # or \&Carp::confess;
Great idea, Tim--thanks!
> spamd handily already does that. ;) Send it a SIGUSR2 and it'll
> dump a backtrace, and the current message's Message-ID.
Gosh, *two* steps of me, you are!
> If you can capture a message that causes one of the standard rules to go
> exponential, please open a bug at http://issues.apache.org/SpamAssassin/
> and we'll track down the regexp and fix it. (If it's a perl bug, we'll
> then open it in _that_ bug tracker ;)
Got it!
Aug 1 09:01:50 chthon spamd[12686]: spamd: caught SIGUSR2 - dumping backtrace. most recent message: <33416880.1217602525815.JavaMail.bulky@10.8.7.84>
Aug 1 09:01:51 chthon spamd[12686]: at /usr/local/bin/spamd line 2428
Aug 1 09:01:51 chthon spamd[12686]: main::backtrace_handler('USR2') called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 659
Aug 1 09:01:51 chthon spamd[12686]: eval {...} called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 659
Aug 1 09:01:51 chthon spamd[12686]: Mail::SpamAssassin::SpamdForkScaling::sysread_with_timeout('Mail::SpamAssassin::SpamdForkScaling=HASH(0x3c039488)', 'IO::Socket=GLOB(0x3d119514)', 'SCALAR(0x3e35b668)', 6, 300) called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 587
Aug 1 09:01:52 chthon spamd[12686]: Mail::SpamAssassin::SpamdForkScaling::wait_for_orders('Mail::SpamAssassin::SpamdForkScaling=HASH(0x3c039488)') called at /usr/local/bin/spamd line 1060
Aug 1 09:01:52 chthon spamd[12686]: main::spawn() called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 823
Aug 1 09:01:52 chthon spamd[12686]: Mail::SpamAssassin::SpamdForkScaling::need_to_add_server('Mail::SpamAssassin::SpamdForkScaling=HASH(0x3c039488)', 0) called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 808
Aug 1 09:01:52 chthon spamd[12686]: Mail::SpamAssassin::SpamdForkScaling::adapt_num_children('Mail::SpamAssassin::SpamdForkScaling=HASH(0x3c039488)') called at /usr/local/lib/perl5/site_perl/5.10.0/Mail/SpamAssassin/SpamdForkScaling.pm line 388
Aug 1 09:01:53 chthon spamd[12686]: Mail::SpamAssassin::SpamdForkScaling::main_server_poll('Mail::SpamAssassin::SpamdForkScaling=HASH(0x3c039488)', 2) called at /usr/local/bin/spamd line 974
Very nice, and very clever. And no exponential pattern. Yet. :-)
But I'll know what to keep my eye on now, and how.
Thanks to everybody!
--tom
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