Technical Tip: How to prevent SNMPD crashes caused by duplicate SNMP indexes in virtual domains

The issue is caused by a duplicate snmp-index in the vdom-property, as shown below:

config system vdom-property
    edit "vdom_1"
        set description "property limits for vdom vdom_1"
        set snmp-index 11
         next
    edit "vdom_2"
        set description "property limits for vdom vdom_2"
        set snmp-index 6 <<<<<<<<< first
        next
    edit "vdom_3"
       set description "property limits for vdom vdom_3"
       set snmp-index 10
        next
    edit "vdom_4"
       set description "property limits for vdom vdom_4"
       set snmp-index 5
       next
    edit "vdom_5"
      set description "property limits for vdom vdom_5"
      set snmp-index 6 <<<<<<<<< second
      next
end

Below is the crashlog:

diagnose debug crashlog read
15181: <00567> firmware FortiGate-3400E v7.2.12,build1761b1761,250909 (GA.M) (Release)
15182: <00567> application snmpd
15183: <00567> *** signal 6 (Aborted) received ***
15184: <00567> Register dump:
15185: <00567> RAX: 0000000000000000 RBX: 00007f517de13040
15186: <00567> RCX: ffffffffffffffff RDX: 0000000000000000
15187: <00567> R08: 0000000000000000 R09: 00007fff06806bf0
15188: <00567> R10: 0000000000000008 R11: 0000000000000246
15189: <00567> R12: 00000000018a2a80 R13: 00007fff06807bb0
15190: <00567> R14: 0000000000000000 R15: 00000000108196d0
15191: <00567> RSI: 00007fff06806bf0 RDI: 0000000000000002
15192: <00567> RBP: 00007fff06806e70 RSP: 00007fff06806bf0
15193: <00567> RIP: 00007f51806bfe41 EFLAGS: 0000000000000246
15194: <00567> CS: 0033 FS: 0000 GS: 0000
15195: <00567> Trap: 0000000000000000 Error: 0000000000000000
15196: <00567> OldMask: 0000000002000000
15197: <00567> CR2: 0000000000000000
15198: <00567> stack: 0x7fff06806bf0 - 0x7fff06808f10
15199: <00567> Backtrace:
15200: <00567> [0x7f51806bfe41] => /usr/lib/x86_64-linux-gnu/libc.so.6
15201: (gsignal+0x00000141) liboffset 00038e41
15202: <00567> [0x7f51806a9557] => /usr/lib/x86_64-linux-gnu/libc.so.6
15203: (abort+0x00000123) liboffset 00022557
15204: <00567> [0x0167111c] => /bin/snmpd
15205: <00567> [0x7f51806bfec0] => /usr/lib/x86_64-linux-gnu/libc.so.6 liboffset
15206: 00038ec0
15207: <00567> [0x018a3ae3] => /bin/snmpd
15208: <00567> [0x018a2be7] => /bin/snmpd
15209: <00567> [0x016730b7] => /bin/snmpd
15210: <00567> [0x02b3123f] => /bin/snmpd
15211: <00567> [0x02b3006f] => /bin/snmpd
15212: <00567> [0x02b2facd] => /bin/snmpd
15213: <00567> [0x02ae6ae2] => /bin/snmpd
15214: <00567> [0x02ae6649] => /bin/snmpd
15215: <00567> [0x02ae849c] => /bin/snmpd
15216: <00567> [0x02ae82f7] => /bin/snmpd
15217: <00567> [0x02ae8901] => /bin/snmpd
15218: <00567> [0x0167744a] => /bin/snmpd
15219: <00567> [0x01677119] => /bin/snmpd
15220: <00567> [0x01670c1f] => /bin/snmpd
15221: <00567> [0x0044bd7f] => /bin/snmpd
15222: <00567> [0x00451358] => /bin/snmpd
15223: <00567> [0x00451c46] => /bin/snmpd
15224: <00567> [0x00454388] => /bin/snmpd
15225: <00567> [0x00454de9] => /bin/snmpd
15226: <00567> [0x7f51806aae1b] => /usr/lib/x86_64-linux-gnu/libc.so.6
15227: (__libc_start_main+0x000000eb) liboffset 00023e1b
15228: <00567> [0x004475da] => /bin/snmpd
15229: <00567> fortidev 6.0.2.0008
15230: the killed daemon is /bin/snmpd: status=0x6
15231: snmpd watchdog timeout
15232: snmpd previously crashed 1 times. The last crash was at 

The snmp-index must be unique for every virtual domain. Below is the range of possible values: