11072 zabbix 1 8 5 6256M 817M nanslp 0 59:04 0.00% zabbix_proxy
here's what to shows

Here's the htop output:

>pmap 11072
11072: zabbix_proxy: configuration syncer [sleeping for 147 seconds]
Address Kbytes RSS Shared Priv Mode Mapped File
0000000000400000 264 264 - 264 r-x /usr/local/sbin/zabbix_proxy
0000000000541000 100 72 - 100 rw- /usr/local/sbin/zabbix_proxy
000000000055A000 72 - - - rw- [swap pager]
0000000800541000 148 104 148 - r-x /libexec/ld-elf.so.1
0000000800566000 36 - - - rw- [swap pager]
0000000800666000 28 8 - 28 rw- /libexec/ld-elf.so.1
000000080066D000 24 - - - rw- [swap pager]
0000000800673000 232 176 232 - r-x /usr/local/lib/mysql/libmysqlclient.so.15
00000008006AD000 4 4 4 - r-x /usr/local/lib/mysql/libmysqlclient.so.15
00000008006AE000 1024 8 1024 - r-x /usr/local/lib/mysql/libmysqlclient.so.15
00000008007AE000 184 36 - 184 rw- /usr/local/lib/mysql/libmysqlclient.so.15
00000008007DC000 4 - - - rw- [swap pager]
00000008007DD000 24 0 24 - r-x /lib/libkvm.so.4
00000008007E3000 4 0 4 - r-x /lib/libkvm.so.4
00000008007E4000 1020 0 1020 - r-x /lib/libkvm.so.4
00000008008E3000 4 0 4 - rw- /lib/libkvm.so.4
00000008008E4000 92 4 92 - r-x /lib/libm.so.5
00000008008FB000 4 0 4 - r-x /lib/libm.so.5
00000008008FC000 1024 0 1024 - r-x /lib/libm.so.5
00000008009FC000 8 0 8 - rw- /lib/libm.so.5
00000008009FE000 932 544 932 - r-x /lib/libc.so.7
0000000800AE7000 4 4 4 - r-x /lib/libc.so.7
0000000800AE8000 1020 0 1020 - r-x /lib/libc.so.7
0000000800BE7000 116 40 - 116 rw- /lib/libc.so.7
0000000800C04000 92 - - - rw- [swap pager]
0000000800C1B000 24 0 24 - r-x /lib/libcrypt.so.4
0000000800C21000 4 0 4 - r-x /lib/libcrypt.so.4
0000000800C22000 1020 0 1020 - r-x /lib/libcrypt.so.4
0000000800D21000 8 0 8 - rw- /lib/libcrypt.so.4

0000000800D34000 72 0 72 - r-x /lib/libz.so.4
0000000800D46000 4 0 4 - r-x /lib/libz.so.4
0000000800D47000 1020 0 1020 - r-x /lib/libz.so.4
0000000800E46000 8 0 8 - rw- /lib/libz.so.4
0000000800F00000 1024 - - - rw- [swap pager]
tonns of lines like
0000000808800000 3072 - - - rw- [swap pager]

If you want - I can give you the whole output at some pastebin site.

Seems like some memory leak to me.