Re: [Mimedefang] reread mimedefang after sa-update

[Marcus Schopen]

Hi Richard,

Am Donnerstag, den 15.09.2016, 00:48 -0500 schrieb Richard Laager:
[...]
> So configure.in has a check for this pthread flag, but does not use
> $PTHREAD_FLAG as part of the $CFLAGS for the SAFE_EMBED_PERL test. Patch
> attached, which results in SAFE_EMBED_PERL set and reread working for me
> on Ubuntu 16.04.
> 
> The patch is for configure.in. You'll need to either regenerate
> configure, or apply the same change to configure.
> 
> Thanks for catching this. I just upgraded my mail servers a couple days
> ago and I hadn't actually tested the reread operation.

Thanks for your patch, great. I built a Ubuntu/trusty backport for
version 2.78. Anyone feel free to use it [1] (no mimedefang code changes
expect Richard's patch and change package format for better patch
handling). 

Ciao
Marcus

[1] https://www.binux.de/debian/trusty/mimedefang/


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Re: [Mimedefang] reread mimedefang after sa-update

[Marcus Schopen]

Hi Richard,

Am Donnerstag, den 15.09.2016, 00:48 -0500 schrieb Richard Laager:
[...]
> > I'm digging into it right now. The problem seems to be that Perl outputs
> > -lpthread as a required LDFLAG, but gcc needs -pthread (with no "l"), or
> > else it fails linking to the symbol pthread_setspecific.
> 
> So configure.in has a check for this pthread flag, but does not use
> $PTHREAD_FLAG as part of the $CFLAGS for the SAFE_EMBED_PERL test. Patch
> attached, which results in SAFE_EMBED_PERL set and reread working for me
> on Ubuntu 16.04.
> 
> The patch is for configure.in. You'll need to either regenerate
> configure, or apply the same change to configure.
> 
> Thanks for catching this. I just upgraded my mail servers a couple days
> ago and I hadn't actually tested the reread operation.

Patched configure.in and configure (line 4234) and built a package on
Ubuntu 12.04 LTS and 14.04 LTS and everything seems fine:

--
checking whether x86_64-linux-gnu-gcc accepts -pthread... yes
checking if we can embed a Perl interpreter in C... yes
checking if it is safe to destroy and recreate a Perl interpreter... yes
checking for res_init in -lresolv... no
--

and I can reread config:

--
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Re-initialized
embedded Perl interpreter
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Killing idle
slave 0 (pid 4225): Forcing reread of filter rules
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Killing idle
slave 1 (pid 4216): Forcing reread of filter rules
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Reap: slave 1
(pid 4216) exited normally with status 0
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Slave 1
resource usage: req=0, scans=0, user=0.000, sys=0.006, nswap=0,
majflt=0, minflt=343, maxrss=27128, bi=0, bo=0
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Reap: slave 0
(pid 4225) exited normally with status 0
Sep 16 18:13:07 vorlage1204 mimedefang-multiplexor[3772]: Slave 0
resource usage: req=0, scans=0, user=0.006, sys=0.000, nswap=0,
majflt=0, minflt=343, maxrss=27128, bi=0, bo=0
--

Ciao
Marcus

-- 
   I'm looking for something that can deliver a 50-pound payload of snow
   on a small feminine target. Can you suggest something? Hello...?
  --- Calvin

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Re: [Mimedefang] reread mimedefang after sa-update

[Dianne Skoll]

On Thu, 15 Sep 2016 00:48:01 -0500
Richard Laager  wrote:

> So configure.in has a check for this pthread flag, but does not use
> $PTHREAD_FLAG as part of the $CFLAGS for the SAFE_EMBED_PERL test.
> Patch attached, which results in SAFE_EMBED_PERL set and reread
> working for me on Ubuntu 16.04.

Oh, thanks!  I'll apply.

Regards,

Dianne.
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Re: [Mimedefang] reread mimedefang after sa-update

[Richard Laager]

On 09/14/2016 11:12 AM, Marcus Schopen wrote:
> Am Mittwoch, den 14.09.2016, 11:51 -0400 schrieb Dianne Skoll:
>> On Wed, 14 Sep 2016 17:46:07 +0200
>> Marcus Schopen  wrote:
>>
>>> Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Cannot destroy
>>> and recreate a Perl interpreter safely on this platform.  Filter rules
>>> will NOT be reread.
>>
>> Huh!  That is very weird.  I don't get anything like that on Debian Jessie.
> 
> Hmmm, I get this error on Ubuntu 12.04 LTS too, mimedefang 2.71, perl
> 5.14.2.
> 
>> If you get that message, then you'll need to do restart instead of reread.
> 
> Okay, but this might harm a mail which is in process. Any ideas how to
> fix above error?

I'm digging into it right now. The problem seems to be that Perl outputs
-lpthread as a required LDFLAG, but gcc needs -pthread (with no "l"), or
else it fails linking to the symbol pthread_setspecific.

Since the SAFE_EMBED_PERL configure test then fails to compile,
MIMEDefang thinks it can't do a reread on this platform.

-- 
Richard
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Re: [Mimedefang] reread mimedefang after sa-update

[Dianne Skoll]

On Wed, 14 Sep 2016 20:39:19 +0200
Marcus Schopen  wrote:

> Hmmm, what's the performance loss if not using embedded Perl?

There is some, but it's mostly related to startup costs.  Once things
are running, there's not a huge difference.  Unless you're running a busy
machine (lets say more than 500 000 messages/day) you shouldn't have any
problems disabling embedded Perl.

Regards,

Dianne.
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Re: [Mimedefang] reread mimedefang after sa-update

[Marcus Schopen]

Am Mittwoch, den 14.09.2016, 13:08 -0400 schrieb Dianne Skoll:
> On Wed, 14 Sep 2016 18:12:39 +0200
> Marcus Schopen  wrote:
> 
> > Okay, but this might harm a mail which is in process. Any ideas how to
> > fix above error?
> 
> No... no idea.  If you don't use embedded Perl (ie, leave the -E flag off
> of the mimedefang-multiplexor command line) then you will be able to
> use md-mx-ctrl reread.

Hmmm, what's the performance loss if not using embedded Perl?

Ciao
Marcus


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Re: [Mimedefang] reread mimedefang after sa-update

[Dianne Skoll]

On Wed, 14 Sep 2016 18:12:39 +0200
Marcus Schopen  wrote:

> Okay, but this might harm a mail which is in process. Any ideas how to
> fix above error?

No... no idea.  If you don't use embedded Perl (ie, leave the -E flag off
of the mimedefang-multiplexor command line) then you will be able to
use md-mx-ctrl reread.

Regards,

Dianne.
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Re: [Mimedefang] reread mimedefang after sa-update

[Marcus Schopen]

Am Mittwoch, den 14.09.2016, 11:51 -0400 schrieb Dianne Skoll:
> On Wed, 14 Sep 2016 17:46:07 +0200
> Marcus Schopen  wrote:
> 
> > Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Cannot destroy
> > and recreate a Perl interpreter safely on this platform.  Filter rules
> > will NOT be reread.
> 
> Huh!  That is very weird.  I don't get anything like that on Debian Jessie.

Hmmm, I get this error on Ubuntu 12.04 LTS too, mimedefang 2.71, perl
5.14.2.

> If you get that message, then you'll need to do restart instead of reread.

Okay, but this might harm a mail which is in process. Any ideas how to
fix above error?

Ciao
Marcus


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Re: [Mimedefang] reread mimedefang after sa-update

[Dianne Skoll]

On Wed, 14 Sep 2016 17:46:07 +0200
Marcus Schopen  wrote:

> Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Cannot destroy
> and recreate a Perl interpreter safely on this platform.  Filter rules
> will NOT be reread.

Huh!  That is very weird.  I don't get anything like that on Debian Jessie.

If you get that message, then you'll need to do restart instead of reread.

Regards,

Dianne.
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Re: [Mimedefang] reread mimedefang after sa-update

[Marcus Schopen]

Am Mittwoch, den 14.09.2016, 09:35 -0400 schrieb Dianne Skoll:
> On Wed, 14 Sep 2016 07:54:50 +0200
> Marcus Schopen  wrote:
> 
> > do I need to reread or reload mimedefang after sa-update e.g. 
> > /etc/cron.daily/spamassassin to get the changes in spamassassin rules
> > recognized by mimedefang?
> 
> Yep.  "md-mx-ctrl reread" is a pretty non-invasive operation, so it's
> quite safe.

Dianne! Thanks.

Then one should add something like "/etc/init.d/mimedefang reread
> /dev/null" to /etc/cron.daily/spamassassin in the section where when
updates are found, right?

/etc/cron.daily/spamassassin:
[...]
# got updates!
su - debian-spamd -c "spamassassin --lint" || die_with_lint
do_compile
reload
# Mimedefang neu laden
/etc/init.d/mimedefang reread > /dev/null
;;
[...]


Btw I get an error on reread, Is this to worried about?

-
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Cannot destroy
and recreate a Perl interpreter safely on this platform.  Filter rules
will NOT be reread.
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Re-initialized
embedded Perl interpreter
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Killing idle
slave 1 (pid 26628): Forcing reread of filter rules
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Killing idle
slave 0 (pid 26627): Forcing reread of filter rules
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Reap: slave 0
(pid 26627) exited normally with status 0
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Slave 0 resource
usage: req=0, scans=0, user=0.004, sys=0.004, nswap=0, majflt=0,
minflt=199, maxrss=36992, bi=0, bo=0
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Reap: slave 1
(pid 26628) exited normally with status 0
Sep 14 17:39:55 scansrv mimedefang-multiplexor[24029]: Slave 1 resource
usage: req=0, scans=0, user=0.007, sys=0.001, nswap=0, majflt=0,
minflt=199, maxrss=36992, bi=0, bo=0
Sep 14 17:39:58 scansrv mimedefang-multiplexor[24029]: Starting slave 1
(pid 26690) (1 running): Bringing slaves up to minSlaves (2)
Sep 14 17:40:01 scansrv mimedefang-multiplexor[24029]: Starting slave 0
(pid 26715) (2 running): Bringing slaves up to minSlaves (2)
-

System is Ubuntu 14.04 LTS, mimedefang 2.73

Ciao
Marcus


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Re: [Mimedefang] reread mimedefang after sa-update

[Dianne Skoll]

On Wed, 14 Sep 2016 07:54:50 +0200
Marcus Schopen  wrote:

> do I need to reread or reload mimedefang after sa-update e.g. 
> /etc/cron.daily/spamassassin to get the changes in spamassassin rules
> recognized by mimedefang?

Yep.  "md-mx-ctrl reread" is a pretty non-invasive operation, so it's
quite safe.

Regards,

Dianne.
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