It happens while de-allocate an index of a shared table which was
never allocated.
The core dump does not ocure every time, its depends on the agentx
traffic so far,
but the session times out and the subagent mib vars are never seen.
Who has written this agentx code? There seems a general problem about
this handling.
Claus
On 03.11.2010, at 18:25, Robert Story wrote:
> On Thu, 28 Oct 2010 20:43:21 +0200 Claus wrote:
> CK> I am working with net-snmp as master agent and a subagent which
> CK> register a private MIB with a table.
> CK>
> CK> First I create a row with set the RowStatus = createAndGo, set
> the
> CK> row object (in my example a DisplayString).
> CK> Than I destroy this row again.
> CK>
> CK> While de-register the row, while working on the snmpset
> CK> request ...RowStatus = destroy
> CK> the master agent crashes!
> CK>
> CK> This happens every time when I do set sequence, with net-snmp
> V5.4.3,
> CK> V5.5, and V5.6!
> CK>
> CK> I need some advice what I can do to locate the problem?
>
> This looks like memory corruption:
>
> CK> Program received signal SIGSEGV, Segmentation fault.
> CK> netsnmp_call_handlers (reginfo=0x5, reqinfo=0x7bb470,
> CK> requests=0x7bb480) at agent_handler.c:477
>
> CK> (gdb) print * asp->treecache[i].subtree
> CK> $5 = {name_a = 0x7bb0f8, namelen = 248 '▒', start_a = 0x0,
> start_len
> CK> = 0 '\0', end_a = 0x7bc0c0,
> CK> end_len = 2 '\002', variables = 0x1, variables_len = 3,
> CK> variables_width = 6,
> CK> label_a = 0x1 <Address 0x1 out of bounds>, session = 0x4,
> flags = 1
> CK> '\001', priority = 0 '\0',
> CK> timeout = 59999, next = 0x21, prev = 0x1, children = 0x2,
> CK> range_subid = 1, range_ubound = 2, reginfo = 0x5,
> CK> cacheid = 1, global_cacheid = 3, oid_off = 1}
>
> You've got pointers with values like 0x5 and 0x1, which leads me to
> believe
> that you're overwriting memory somewhere... On Linux, I'd suggest
> valgrind to
> help detect this. I'm not sure what you'de use on windows.
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