I suppose an implementation of ZBXNEXT-801 caused agent crash under FreeBSD

1. uname -a
   FreeBSD mon 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:55:53 UTC 2010 [email protected]:/usr/obj/usr/src/sys/GENERIC i386

Some old compiled agent where the keys worked successfully:

1. ./zabbix_agentd -V
   Zabbix Agent (daemon) v2.0.0rc3 (revision 26686) (22 March 2012)
   Compilation time: Apr 7 2012 17:43:40

1. zabbix_get -s localhost -k vfs.dev.write[ad0,ops]
   11.969697

Then some old agent where the problem appeared:

1. ./zabbix_agentd -V
   Zabbix Agent (daemon) v2.1.0 (revision 28358) (21 May 2012)
   Compilation time: Jun 19 2012 20:20:27

Its debuglog when getting the key:

51584:20121005:160220.675 Starting Zabbix Agent [fbsd]. Zabbix 2.1.0 (revision 28358).
51584:20121005:160220.675 In init_collector_data()
51584:20121005:160220.675 End of init_collector_data()
51585:20121005:160220.676 agent #0 started [collector]
51585:20121005:160220.676 In init_cpu_collector()
51585:20121005:160220.677 End of init_cpu_collector():SUCCEED
51587:20121005:160220.677 agent #2 started [listener]
51585:20121005:160220.677 In update_cpustats()
51585:20121005:160220.677 End of update_cpustats()
51586:20121005:160220.677 agent #1 started [listener]
51588:20121005:160220.677 agent #3 started [listener]
51585:20121005:160221.677 In update_cpustats()
51585:20121005:160221.677 End of update_cpustats()
51585:20121005:160222.678 In update_cpustats()
51585:20121005:160222.678 End of update_cpustats()
51586:20121005:160223.133 Processing request.
51586:20121005:160223.233 Requested [vfs.dev.write[ad0,ops]]
51586:20121005:160223.233 In collector_diskdevice_get() devname:'ad0'
51586:20121005:160223.233 zbx_shmget() removing existing shm_id:655367
zabbix_agentd_2012-08-16_11-52-49 [51586]: cannot remove existing shared memory: [13] Permission denied
51586:20121005:160223.234 cannot allocate shared memory for disk statistics collector
51584:20121005:160223.234 One child process died (PID:51586,exitcode/signal:256). Exiting ...
51584:20121005:160223.234 zbx_on_exit() called
51587:20121005:160223.234 Got signal [signal:15(SIGTERM),sender_pid:51584,sender_uid:122,reason:65537]. Exiting ...
51585:20121005:160223.235 Got signal [signal:15(SIGTERM),sender_pid:51584,sender_uid:122,reason:65537]. Exiting ...
51588:20121005:160223.235 Got signal [signal:15(SIGTERM),sender_pid:51584,sender_uid:122,reason:65537]. Exiting ...
51584:20121005:160225.237 Zabbix Agent stopped. Zabbix 2.1.0 (revision 28358).

Note that you cannot test this crash in current trunk/2.0.3 because another problem ZBX-5661