error: Shared data size conflict in shared_data for monitor

[vlad2005]

I got tons of this error:

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Component   | Pid  | Level | Code | Message                                                                                            | File          | Line |
+-------------------+-------------+------+-------+------+----------------------------------------------------------------------------------------------------+---------------+------+
| zmwatch     | 2279 |    -2 | ERR  | Shared data size conflict in shared_data for monitor monitor-1, expected 336, got 539634218 | zmwatch.pl    | NULL |

I found some old post something about replacing an line in /usr/share/perl5/ZoneMinder/Memory.pm, but i can't find this file. Where is?

[vlad2005]

Sorry i found this file later:
/usr/share/perl/5.18.2/ZoneMinder/Memory.pm
Edit line 130 and put: our $arch = 32;
Probably for 64bit arhitecture need to put 64.

This problem seem to be very old. Why is not resolved until now?

[linuxsense]

This is probably related to how you are capturing the camera stream. What version of ZM are you using? The current source from the git repo or something else? What are your camera settings?

[vlad2005]

I use 1.27.1 from repository.
But searching on git source code i found file Memory.pm.in wich contain at line 130 same code:

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our $arch = int(3.2*length(~0));

Seem that not working.

[knight-of-ni]

This zoneminder error only happens when you install a 32bit Linux OS on 64bit capable hardware.

[knight-of-ni]

I've got an idea on how to fix this, but I need more data.

Please save the following to a script file e.g. perltest.pl, mark it executable, and run it:

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#!/usr/bin/perl

use strict;
use warnings;
use Config;

our $test = length(~0);
our $arch = int(3.2*length(~0));

print "Value of length test: $test\n";
print "Value of our arch: $arch\n";
print "Config value of selectminbits: $Config{selectminbits}\n";

Pleae copy and paste the script's output into your reply.

[vlad2005]

Output:

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Value of length test: 20
Value of our arch: 64
Config value of selectminbits: 32

My system:

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$ uname -a
Linux XXXXXX 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:02:19 UTC 2014 i686 i686 i686 GNU/Linux

[knight-of-ni]

I have proposed a fix here:
https://github.com/ZoneMinder/ZoneMinder/pull/462

If all goes well, it should be part of 1.27.1

[vlad2005]

Ok, thanks!!!

[dazed]

knnniggett...I cant seem to get rid of that error either with the above listed line 130 changes mentioned above.

I ran your script and this was my output

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Value of length test: 20
Value of our arch: 64
Config value of selectminbits: 64

My system

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Linux CCTV 3.11.0-24-generic #42~precise1-Ubuntu SMP Fri Jul 4 21:22:54 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[knight-of-ni]

knnniggett...I cant seem to get rid of that error either with the above listed line 130 changes mentioned above.

I ran your script and this was my output

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Value of length test: 20
Value of our arch: 64
Config value of selectminbits: 64

My system

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Linux CCTV 3.11.0-24-generic #42~precise1-Ubuntu SMP Fri Jul 4 21:22:54 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

If you hard code the relevant line of code, like the OP did, to reflect the number of bits of your OS, and you still see a shared data size conflct in the logs then you've got some other problem not related to this issue other than sharing the same error message.

To put it another way, the issue described in this thread only affects a select few who are running a 32bit OS on 64bit capable hardware and are running certain distros. I can duplicate the issue on 32bit Ubuntu and 32bit FreeBSD 8.3, but 32bit CentOS does not cause the issue.