Zabbix server's memory decreases. Then server crashes.

[zab_fan]

Hi,

I use Zabbix server 1.8.1 , the server memory decreases after start. And then zabbix_server process stops.
Please see the screenshot. Any ideas?

I have a oom-killer error too... Here is my syslog file :

Mar 24 04:03:59 my-host kernel: [673317.736917] mysqld invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
Mar 24 04:04:00 my-host kernel: [673317.736933] mysqld cpuset=/ mems_allowed=0
Mar 24 04:04:00 my-host kernel: [673317.736946] Pid: 22779, comm: mysqld Not tainted 2.6.32-39-generic-pae #86-Ubuntu
Mar 24 04:04:00 my-host kernel: [673317.736956] Call Trace:
Mar 24 04:04:00 my-host kernel: [673317.736981]  [<c01d70b4>] oom_kill_process+0xa4/0x2b0
Mar 24 04:04:00 my-host kernel: [673317.736997]  [<c01d7729>] ? select_bad_process+0xa9/0xe0
Mar 24 04:04:00 my-host kernel: [673317.737012]  [<c01d77b1>] __out_of_memory+0x51/0xa0
Mar 24 04:04:00 my-host kernel: [673317.737027]  [<c01d7858>] out_of_memory+0x58/0xb0
Mar 24 04:04:00 my-host kernel: [673317.737066]  [<c01da178>] __alloc_pages_slowpath+0x498/0x4b0
Mar 24 04:04:00 my-host kernel: [673317.737083]  [<c01da2ca>] __alloc_pages_nodemask+0x13a/0x170
Mar 24 04:04:00 my-host kernel: [673317.737100]  [<c01dc88a>] __do_page_cache_readahead+0xea/0x200
Mar 24 04:04:00 my-host kernel: [673317.737115]  [<c01dc9c6>] ra_submit+0x26/0x30
Mar 24 04:04:00 my-host kernel: [673317.737129]  [<c01d5b2c>] filemap_fault+0x3dc/0x410
Mar 24 04:04:00 my-host kernel: [673317.737145]  [<c013867c>] ? kmap_atomic_prot+0x4c/0x110
Mar 24 04:04:00 my-host kernel: [673317.737159]  [<c01f053c>] __do_fault+0x4c/0x520
Mar 24 04:04:00 my-host kernel: [673317.737172]  [<c013867c>] ? kmap_atomic_prot+0x4c/0x110
Mar 24 04:04:00 my-host kernel: [673317.737185]  [<c01f1a88>] handle_mm_fault+0x198/0x4a0
Mar 24 04:04:00 my-host kernel: [673317.737201]  [<c05ba01d>] do_page_fault+0x10d/0x3a0
Mar 24 04:04:00 my-host kernel: [673317.737215]  [<c05b9f10>] ? do_page_fault+0x0/0x3a0
Mar 24 04:04:00 my-host kernel: [673317.737228]  [<c05b7ed3>] error_code+0x73/0x80
Mar 24 04:04:00 my-host kernel: [673317.737237] Mem-Info:
Mar 24 04:04:00 my-host kernel: [673317.737244] DMA per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.737253] CPU    0: hi:    0, btch:   1 usd:   0
Mar 24 04:04:00 my-host kernel: [673317.737262] CPU    1: hi:    0, btch:   1 usd:   0
Mar 24 04:04:00 my-host kernel: [673317.737270] Normal per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.737278] CPU    0: hi:  186, btch:  31 usd: 116
Mar 24 04:04:00 my-host kernel: [673317.737287] CPU    1: hi:  186, btch:  31 usd: 173
Mar 24 04:04:00 my-host kernel: [673317.737294] HighMem per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.737302] CPU    0: hi:   90, btch:  15 usd:  78
Mar 24 04:04:00 my-host kernel: [673317.737314] CPU    1: hi:   90, btch:  15 usd:  42
Mar 24 04:04:00 my-host kernel: [673317.737333] active_anon:122912 inactive_anon:122874 isolated_anon:0
Mar 24 04:04:00 my-host kernel: [673317.737337]  active_file:209 inactive_file:296 isolated_file:0
Mar 24 04:04:00 my-host kernel: [673317.737340]  unevictable:0 dirty:0 writeback:276 unstable:0
Mar 24 04:04:00 my-host kernel: [673317.737344]  free:4313 slab_reclaimable:646 slab_unreclaimable:1471
Mar 24 04:04:00 my-host kernel: [673317.737348]  mapped:2719 shmem:2504 pagetables:1224 bounce:0
Mar 24 04:04:00 my-host kernel: [673317.737367] DMA free:4056kB min:72kB low:88kB high:108kB active_anon:1892kB inactive_anon:1908kB active_file:48kB inactive_file:152kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15856kB mlocked:0kB dirty:0kB writeback:0kB mapped:76kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:27 all_unreclaimable? yes
Mar 24 04:04:00 my-host kernel: [673317.737384] lowmem_reserve[]: 0 700 1000 1000
Mar 24 04:04:00 my-host kernel: [673317.737419] Normal free:12900kB min:3348kB low:4184kB high:5020kB active_anon:335920kB inactive_anon:335620kB active_file:672kB inactive_file:752kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:717288kB mlocked:0kB dirty:0kB writeback:800kB mapped:10080kB shmem:9480kB slab_reclaimable:2584kB slab_unreclaimable:5884kB kernel_stack:1680kB pagetables:4896kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:2336 all_unreclaimable? yes
Mar 24 04:04:00 my-host kernel: [673317.737437] lowmem_reserve[]: 0 0 2397 2397
Mar 24 04:04:00 my-host kernel: [673317.737469] HighMem free:296kB min:296kB low:652kB high:1012kB active_anon:153836kB inactive_anon:153968kB active_file:116kB inactive_file:280kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:306836kB mlocked:0kB dirty:0kB writeback:304kB mapped:720kB shmem:536kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:512 all_unreclaimable? yes
Mar 24 04:04:00 my-host kernel: [673317.737487] lowmem_reserve[]: 0 0 0 0
Mar 24 04:04:00 my-host kernel: [673317.737509] DMA: 0*4kB 1*8kB 2*16kB 3*32kB 3*64kB 3*128kB 3*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 4040kB
Mar 24 04:04:00 my-host kernel: [673317.737561] Normal: 189*4kB 176*8kB 109*16kB 59*32kB 27*64kB 10*128kB 2*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 12900kB
Mar 24 04:04:00 my-host kernel: [673317.737614] HighMem: 6*4kB 0*8kB 1*16kB 3*32kB 2*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 264kB
Mar 24 04:04:00 my-host kernel: [673317.737665] 6194 total pagecache pages
Mar 24 04:04:00 my-host kernel: [673317.737672] 3139 pages in swap cache
Mar 24 04:04:00 my-host kernel: [673317.737681] Swap cache stats: add 161859, delete 158720, find 167212/169422
Mar 24 04:04:00 my-host kernel: [673317.737689] Free swap  = 0kB
Mar 24 04:04:00 my-host kernel: [673317.737696] Total swap = 248824kB
Mar 24 04:04:00 my-host kernel: [673317.745369] 262144 pages RAM
Mar 24 04:04:00 my-host kernel: [673317.745380] 77314 pages HighMem
Mar 24 04:04:00 my-host kernel: [673317.745388] 6231 pages reserved
Mar 24 04:04:00 my-host kernel: [673317.745395] 19572 pages shared
Mar 24 04:04:00 my-host kernel: [673317.745403] 247658 pages non-shared
Mar 24 04:04:00 my-host kernel: [673317.745413] Out of memory: kill process 22757 (zabbix_server) score 135746 or a child
Mar 24 04:04:00 my-host kernel: [673317.745452] Killed process 22759 (zabbix_server)
Mar 24 04:04:00 my-host kernel: [673317.756817] zabbix_server invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
Mar 24 04:04:00 my-host kernel: [673317.756822] zabbix_server cpuset=/ mems_allowed=0
Mar 24 04:04:00 my-host kernel: [673317.756827] Pid: 22783, comm: zabbix_server Not tainted 2.6.32-39-generic-pae #86-Ubuntu
Mar 24 04:04:00 my-host kernel: [673317.756830] Call Trace:
Mar 24 04:04:00 my-host kernel: [673317.756841]  [<c01d70b4>] oom_kill_process+0xa4/0x2b0
Mar 24 04:04:00 my-host kernel: [673317.756846]  [<c01d7729>] ? select_bad_process+0xa9/0xe0
Mar 24 04:04:00 my-host kernel: [673317.756852]  [<c01d77b1>] __out_of_memory+0x51/0xa0
Mar 24 04:04:00 my-host kernel: [673317.756857]  [<c01d7858>] out_of_memory+0x58/0xb0
Mar 24 04:04:00 my-host kernel: [673317.756861]  [<c01da178>] __alloc_pages_slowpath+0x498/0x4b0
Mar 24 04:04:00 my-host kernel: [673317.756866]  [<c01da2ca>] __alloc_pages_nodemask+0x13a/0x170
Mar 24 04:04:00 my-host kernel: [673317.756871]  [<c01dc88a>] __do_page_cache_readahead+0xea/0x200
Mar 24 04:04:00 my-host kernel: [673317.756876]  [<c01dc9c6>] ra_submit+0x26/0x30
Mar 24 04:04:00 my-host kernel: [673317.756880]  [<c01d5b2c>] filemap_fault+0x3dc/0x410
Mar 24 04:04:00 my-host kernel: [673317.756885]  [<c013867c>] ? kmap_atomic_prot+0x4c/0x110
Mar 24 04:04:00 my-host kernel: [673317.756890]  [<c01f053c>] __do_fault+0x4c/0x520
Mar 24 04:04:00 my-host kernel: [673317.756894]  [<c013867c>] ? kmap_atomic_prot+0x4c/0x110
Mar 24 04:04:00 my-host kernel: [673317.756898]  [<c01f1a88>] handle_mm_fault+0x198/0x4a0
Mar 24 04:04:00 my-host kernel: [673317.756904]  [<c0106ffb>] ? xen_restore_fl_direct_end+0x0/0x1
Mar 24 04:04:00 my-host kernel: [673317.756910]  [<c05ba01d>] do_page_fault+0x10d/0x3a0
Mar 24 04:04:00 my-host kernel: [673317.756915]  [<c05b9f10>] ? do_page_fault+0x0/0x3a0
Mar 24 04:04:00 my-host kernel: [673317.756919]  [<c05b7ed3>] error_code+0x73/0x80
Mar 24 04:04:00 my-host kernel: [673317.756922] Mem-Info:
Mar 24 04:04:00 my-host kernel: [673317.756925] DMA per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.756928] CPU    0: hi:    0, btch:   1 usd:   0
Mar 24 04:04:00 my-host kernel: [673317.756931] CPU    1: hi:    0, btch:   1 usd:   0
Mar 24 04:04:00 my-host kernel: [673317.756934] Normal per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.756936] CPU    0: hi:  186, btch:  31 usd: 181
Mar 24 04:04:00 my-host kernel: [673317.756939] CPU    1: hi:  186, btch:  31 usd: 173
Mar 24 04:04:00 my-host kernel: [673317.756941] HighMem per-cpu:
Mar 24 04:04:00 my-host kernel: [673317.756944] CPU    0: hi:   90, btch:  15 usd:  51
Mar 24 04:04:00 my-host kernel: [673317.756947] CPU    1: hi:   90, btch:  15 usd:  34
Mar 24 04:04:00 my-host kernel: [673317.756952] active_anon:122876 inactive_anon:122843 isolated_anon:0
Mar 24 04:04:00 my-host kernel: [673317.756953]  active_file:201 inactive_file:319 isolated_file:32
Mar 24 04:04:00 my-host kernel: [673317.756954]  unevictable:0 dirty:0 writeback:295 unstable:0
Mar 24 04:04:00 my-host kernel: [673317.756955]  free:4323 slab_reclaimable:646 slab_unreclaimable:1471
Mar 24 04:04:00 my-host kernel: [673317.756956]  mapped:2687 shmem:2504 pagetables:1224 bounce:0
Mar 24 04:04:00 my-host kernel: [673317.756962] DMA free:4096kB min:72kB low:88kB high:108kB active_anon:1892kB inactive_anon:1908kB active_file:16kB inactive_file:100kB unevictable:0kB isolated(anon):0kB isolated(file):128kB present:15856kB mlocked:0kB dirty:0kB writeback:0kB mapped:48kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Mar 24 04:04:00 my-host kernel: [673317.756967] lowmem_reserve[]: 0 700 1000 1000
Mar 24 04:04:00 my-host kernel: [673317.757008] DMA: 11*4kB 6*8kB 2*16kB 3*32kB 3*64kB 3*128kB 3*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 4124kB
Mar 24 04:04:00 my-host kernel: [673317.757026] Normal: 189*4kB 176*8kB 109*16kB 59*32kB 27*64kB 10*128kB 2*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 12900kB
Mar 24 04:04:00 my-host kernel: [673317.757044] HighMem: 6*4kB 0*8kB 1*16kB 3*32kB 2*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 264kB
Mar 24 04:04:00 my-host kernel: [673317.757074] 6206 total pagecache pages
Mar 24 04:04:00 my-host kernel: [673317.757077] 3141 pages in swap cache
Mar 24 04:04:00 my-host kernel: [673317.757079] Swap cache stats: add 161878, delete 158737, find 167212/169423
Mar 24 04:04:00 my-host kernel: [673317.757082] Free swap  = 0kB
Mar 24 04:04:00 my-host kernel: [673317.757084] Total swap = 248824kB
Mar 24 04:04:00 my-host kernel: [673317.760784] 262144 pages RAM
Mar 24 04:04:00 my-host kernel: [673317.760787] 77314 pages HighMem
Mar 24 04:04:00 my-host kernel: [673317.760789] 6231 pages reserved
Mar 24 04:04:00 my-host kernel: [673317.760791] 19190 pages shared
Mar 24 04:04:00 my-host kernel: [673317.760794] 247613 pages non-shared
Mar 24 04:04:00 my-host kernel: [673317.760797] Out of memory: kill process 22757 (zabbix_server) score 132702 or a child
Mar 24 04:04:00 my-host kernel: [673317.760816] Killed process 22760 (zabbix_server)

Thanks.

[g.vecchi]

Same problem here.
Zabbix 1.8.1 on Ubuntu Server 10.04.4

The only workaround I found at the moment is to set a cron task to restart zabbix_server every day; edit /etc/crontab:

# Zabbix Server Restart
00 7    * * *   root    restart zabbix-server &> /dev/null

My free -m :

              total       used       free     shared    buffers     cached
Mem:          4972       2842       2129          0         46        159
-/+ buffers/cache:       2636       2335
Swap:          952         87        865

My /var/log/syslog

Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892124] mysqld invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892130] mysqld cpuset=/ mems_allowed=0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892135] Pid: 15262, comm: mysqld Not tainted 2.6.32-41-server #91-Ubuntu
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892138] Call Trace:
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892150]  [<ffffffff810b4f7d>] ? cpuset_print_task_mems_allowed+0x9d/0xb0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892158]  [<ffffffff810f94a4>] oom_kill_process+0xd4/0x2f0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892163]  [<ffffffff810f9a60>] ? select_bad_process+0xd0/0x110
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892168]  [<ffffffff810f9af8>] __out_of_memory+0x58/0xc0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892172]  [<ffffffff810f9c8e>] out_of_memory+0x12e/0x1a0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892177]  [<ffffffff81560cbe>] ? _spin_lock+0xe/0x20
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892182]  [<ffffffff810fcdf1>] __alloc_pages_slowpath+0x571/0x590
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892187]  [<ffffffff810fcf89>] __alloc_pages_nodemask+0x179/0x180
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892192]  [<ffffffff81130387>] alloc_pages_current+0x87/0xd0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892196]  [<ffffffff810f6c67>] __page_cache_alloc+0x67/0x70
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892200]  [<ffffffff810f82f3>] filemap_fault+0x1b3/0x450
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892205]  [<ffffffff81114e64>] __do_fault+0x54/0x500
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892211]  [<ffffffff8101184e>] ? __switch_to+0x26e/0x320
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892215]  [<ffffffff81118428>] handle_mm_fault+0x1a8/0x3c0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892221]  [<ffffffff81563835>] do_page_fault+0x125/0x3b0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892224]  [<ffffffff81561185>] page_fault+0x25/0x30
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892228] Mem-Info:
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892230] Node 0 DMA per-cpu:
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892233] CPU    0: hi:    0, btch:   1 usd:   0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892236] CPU    1: hi:    0, btch:   1 usd:   0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892238] Node 0 DMA32 per-cpu:
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892241] CPU    0: hi:  186, btch:  31 usd:  89
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892244] CPU    1: hi:  186, btch:  31 usd: 143
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892246] Node 0 Normal per-cpu:
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892249] CPU    0: hi:  186, btch:  31 usd:  66
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892251] CPU    1: hi:  186, btch:  31 usd: 169
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892257] active_anon:974604 inactive_anon:247357 isolated_anon:0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892258]  active_file:10 inactive_file:1547 isolated_file:0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892259]  unevictable:0 dirty:1 writeback:0 unstable:0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892261]  free:8116 slab_reclaimable:1495 slab_unreclaimable:3026
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892262]  mapped:3246 shmem:2890 pagetables:5327 bounce:0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892264] Node 0 DMA free:15880kB min:24kB low:28kB high:36kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15316kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:8kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892275] lowmem_reserve[]: 0 3128 5021 5021
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892281] Node 0 DMA32 free:13200kB min:5640kB low:7048kB high:8460kB active_anon:2562316kB inactive_anon:512592kB active_file:0kB inactive_file:4804kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3203092kB mlocked:0kB dirty:4kB writeback:0kB mapped:2436kB shmem:1220kB slab_reclaimable:1568kB slab_unreclaimable:1716kB kernel_stack:152kB pagetables:9688kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:17 all_unreclaimable? yes
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892292] lowmem_reserve[]: 0 0 1893 1893
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892297] Node 0 Normal free:3384kB min:3412kB low:4264kB high:5116kB active_anon:1336100kB inactive_anon:476836kB active_file:40kB inactive_file:1384kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:1939200kB mlocked:0kB dirty:0kB writeback:0kB mapped:10548kB shmem:10340kB slab_reclaimable:4412kB slab_unreclaimable:10380kB kernel_stack:1296kB pagetables:11620kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:32 all_unreclaimable? yes
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892308] lowmem_reserve[]: 0 0 0 0
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892313] Node 0 DMA: 2*4kB 2*8kB 3*16kB 4*32kB 3*64kB 3*128kB 1*256kB 1*512kB 2*1024kB 2*2048kB 2*4096kB = 15880kB
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892326] Node 0 DMA32: 2440*4kB 2*8kB 4*16kB 5*32kB 2*64kB 0*128kB 2*256kB 1*512kB 2*1024kB 0*2048kB 0*4096kB = 13200kB
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892338] Node 0 Normal: 374*4kB 2*8kB 1*16kB 2*32kB 2*64kB 1*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 3384kB
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892351] 32056 total pagecache pages
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892353] 27603 pages in swap cache
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892355] Swap cache stats: add 1098869, delete 1071266, find 390091/436644
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892358] Free swap  = 0kB
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.892359] Total swap = 975864kB
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912485] 1310720 pages RAM
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912512] 37740 pages reserved
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912515] 40411 pages shared
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912518] 1259159 pages non-shared
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912524] Out of memory: kill process 15238 (zabbix_server) score 508316 or a child
Jul 11 07:41:39 SAERUBUNTU003 kernel: [602144.912770] Killed process 15239 (zabbix_server)

[g.vecchi]

Here some info (different Ubuntu version):

http://www.realpowerwork.com/fileadmin/documents/linux/Zabbix%201.8.x%20Installation%20(Ubuntu_Server_10.10).htm

At the bottom of the page the guy says that the problem would be a bad SNMP implementation in zabbix server (it's typed in german, thanks google translate )

Maybe an 1.8.1 bug?