in general, 32bit agents will work on 64bit systems but may fail in some cases. for a quite different os, but similar, problem, see ZBX-6412
we should probably :
(1) document this
martins-v Added as a general note to:
https://www.zabbix.com/documentation/2.0/manual/concepts/agent
https://www.zabbix.com/documentation/2.2/manual/concepts/agent
(2) be explicit about aix agent platform on the download page
But does it make sense to only have 32bit binaries for AIX on the download page? I don't think many people are running 32bit AIX 5.3 kernels, much less AIX 6.1...
that's more of a feature request that a bug, though 
Can you attach your compiled binary zabbix_agentd to this thread or send to my email (neiromc[AT]gmail.com)
I can't build this from sources. More Thanks!
Here you go: http://cloud.carlos-rodrigues.com/bugs/zabbix_agentd.2.0.6.aix61.64bit.gz
AIX 7.1 has same problem with system.uptime.
It seems like uptime counter overflowed after 497 days.
2016-07-05 10:57:48 1467683868 507737 2016-07-05 10:47:48 1467683268 507137 $ uptime 10:58AM up 502 days, 23:31, 1 user, load average: 0.13, 0.13, 0.14
2016-06-29 14:07:48 1467176868 737 2016-06-29 13:57:48 1467176268 137 2016-06-29 13:47:48 1467175668 4294966834 2016-06-29 13:37:48 1467175068 4294966235 2016-06-29 13:27:48 1467174468 4294965634 2016-06-29 13:17:48 1467173868 4294965034
Also, after 248+ days of system.uptime has completely changed values from 248 to 49461 (Days).
There was a similar issue ZBX-6637 on Solaris platform where a 32-bit Zabbix agent could not provide correct info about 64-bit processes and the solution was always using a 64-bit Zabbix agent on Solaris.
Seems like a natural solution is to use only 64-bit Zabbix agent on AIX, too. We could change build scripts to make 64-bit agent by default.
Does anybody need a 32-bit agent on AIX ?
Proposed solution
Do not use 32-bit Zabbix agent on AIX, just compile the agent in 64-bit mode. No Zabbix source code modification is required.
Zabbix agent on UNIX uses iconv() function which may be part of libc or supplied by a dedicated libiconv library.
On an AIX 6.1 test system we had access to only a 32-bit GNU libiconv was installed, which could not be used for building 64-bit agent. Thus the first step is to build 64-bit GNU libiconv from source.
Compiling 64-bit GNU libiconv on AIX
Download source http://ftp.gnu.org/gnu/libiconv/, then:
$ gunzip -c libiconv-1.14.tar.gz | tar xf - $ cd libiconv-1.14 $ unset OBJECT_MODE $ CFLAGS="-maix64 -g -O2" ./configure --disable-shared --prefix=`pwd` $ export OBJECT_MODE=64 $ make install
The newly built liibrary contains 64-bit objects:
$ ar -tv -X64 lib/libiconv.a rw-r--r-- 210/210 1473346 Jul 20 20:27 2016 iconv.o rw-r--r-- 210/210 44232 Jul 20 20:27 2016 localcharset.o rw-r--r-- 210/210 35078 Jul 20 20:27 2016 relocatable.o
and no 32-bit objects:
$ ar -tv -X32 lib/libiconv.a (nothing is shown)
iconv is 64-bit executable:
$ file bin/iconv bin/iconv: 64-bit XCOFF executable or object module not stripped
Location of libiconv (will be used in the next step):
$ pwd /admin/tmp/andris/libiconv-1.14
Compiling 64-bit Zabbix agent and utilities on AIX
$ gunzip -c zabbix-3.0.4rc1.tar.gz | tar xf -
$ cd zabbix-3.0.4rc1
$ export OBJECT_MODE=64
$ CFLAGS="-maix64 -g -O2" ./configure --enable-agent --with-iconv=/admin/tmp/andris/libiconv-1.14 --prefix=`pwd`
....
Configuration:
Detected OS: aix6.1.1.0
Install path: /admin/tmp/andris/zabbix-3.0.4rc1
Compilation arch: aix
Compiler: /admin/tmp/andris/zabbix-3.0.4rc1/compile gcc
Compiler flags: -maix64 -g -O2
Library-specific flags:
iconv: -I//admin/tmp/andris/libiconv-1.14/include
Enable server: no
Enable proxy: no
Enable agent: yes
Agent details:
TLS: no
Linker flags: -L//admin/tmp/andris/libiconv-1.14/lib
Libraries: -lm -lperfstat -liconv
...
$ make install
Executable files are 64-bit:
$ file bin/z* sbin/z* bin/zabbix_get: 64-bit XCOFF executable or object module not stripped bin/zabbix_sender: 64-bit XCOFF executable or object module not stripped sbin/zabbix_agentd: 64-bit XCOFF executable or object module not stripped
Library dependencies:
$ ldd sbin/zabbix_agentd
sbin/zabbix_agentd needs:
/usr/lib/libc.a(shr_64.o)
/usr/lib/libperfstat.a(shr_64.o)
/unix
/usr/lib/libcrypt.a(shr_64.o)
/usr/lib/libpthreads.a(shr_xpg5_64.o)
/usr/lib/libcfg.a(shr_64.o)
/usr/lib/libodm.a(shr_64.o)
/usr/lib/libcorcfg.a(shr_64.o)
/usr/lib/liblvm.a(shr_64.o)
/usr/lib/libsrc.a(shr_64.o)
This procedure was tested with Zabbix agent versions 2.0, 3.0 and trunk.
After the Zabbix agent is successfully compiled, the GNU libiconv directory (e.g. /admin/tmp/andris/libiconv-1.14/) can be deleted.
Can somebody test the proposed solution ? I have neither access to AIX machine with uptime > 497 days nor a clean, standard AIX installation
Got a feedback that 64-bit agent solves the issue.