[AGENT++] SNMP++ 3.2.16 memory fault on AIX 5.3

[???163]

Hi,

A couple days ago, I submit a crash of snmp++ program. It report the crash
point like this:

> CSNMPMessageQueue::HandleEvents(int,const fd_set&,const fd_set&,const
> fd_set&)(this = 0x20d73858, maxfds = 48, readfds = &(...),  = &(...),  =
> &(...)), line 468 in "msgqueue.cpp"
> (dbx) l
>   468     FD_ZERO(&snmp_writefds);

I suppose there’s some other code have overwritten the free heap,

hence the program access the wrong address.

So I compile the consoleExamples in snmp++ via xlC_r (VisualAge C++
Professional / C for AIX Compiler, Version 6) with such options:



COPTIONS
= -g -bdynamic -brtl -D_AIX -D_XPG4_EXTENDED -D__unix -D_REENTRANT -qdbxextr
a -qcheck=all -qfullpath -qheapdebug

CINCDIRS = -I. -I../include



USEROPTS =

CFLAGS   = $(COPTIONS) $(CINCDIRS) $(USEROPTS)

LDFLAGS  = -g -brtl -bdynamic -qthreaded -qheapdebug

SHARED   = -G



And snmp++ lib are also compiled with the same setting.

The example program ‘snmpGet’ issues such information:



$ snmpGet 10.0.254.254 .1.3.6.1.2.1.1.1.0

SNMP++ Get to 10.0.254.254 SNMPV1 Retries=1 Timeout=100ms Community=public

1546-525 Object 0x20109558 is invalid or a libc heap object at line 535 in
../include/snmp_pp/address.h

1546-522 Traceback:

           d9e383fc = _debug_ufree + 0x38

           d9e30a18 = _debug_free + 0x18

           d9e213d0 = ? + 0x44

           1000be38 = __dt__10UdpAddressFv + 0x8C

           10023984 = __dt__12CSNMPMessageFv + 0xA4

           100246bc = __dt__Q2_17CSNMPMessageQueue20CSNMPMessageQueueEltFv +
0xA8

           100252c4 = DeleteEntry__17CSNMPMessageQueueFUl + 0x5C

           100273dc = SNMPBlockForResponse__15EventListHolderFUlR3Pdu + 0xA0

           10005d60 =
snmp_engine__4SnmpFR3PdulT2RC10SnmpTargetPFiP4SnmpR3PduR10SnmpTargetPv_vPCvi
+ 0x1028

           10004ca0 = get__4SnmpFR3PduRC10SnmpTarget + 0x50

           1000b850 = main + 0x798

1546-525 Object 0x201096B8 is invalid or a libc heap object at line 535 in
../include/snmp_pp/address.h

1546-522 Traceback:

           d9e383fc = _debug_ufree + 0x38

           d9e30a18 = _debug_free + 0x18

           d9e213d0 = ? + 0x44

           1000be38 = __dt__10UdpAddressFv + 0x8C

           1000c9c4 = __dt__10GenAddressFv + 0xB0

           1000c70c = __dt__10SnmpTargetFv + 0x74

           1000c34c = __dt__7CTargetFv + 0xB4

           100239cc = __dt__12CSNMPMessageFv + 0xEC

           100246bc = __dt__Q2_17CSNMPMessageQueue20CSNMPMessageQueueEltFv +
0xA8

           100252c4 = DeleteEntry__17CSNMPMessageQueueFUl + 0x5C

           100273dc = SNMPBlockForResponse__15EventListHolderFUlR3Pdu + 0xA0

           10005d60 =
snmp_engine__4SnmpFR3PdulT2RC10SnmpTargetPFiP4SnmpR3PduR10SnmpTargetPv_vPCvi
+ 0x1028

           10004ca0 = get__4SnmpFR3PduRC10SnmpTarget + 0x50

           1000b850 = main + 0x798

1546-525 Object 0x20109168 is invalid or a libc heap object at line 535 in
../include/snmp_pp/address.h

1546-522 Traceback:

           d9e383fc = _debug_ufree + 0x38

           d9e30a18 = _debug_free + 0x18

           d9e213d0 = ? + 0x44

           1000be38 = __dt__10UdpAddressFv + 0x8C

           1000790c = __dt__10GenAddressFv + 0x98

           10005df0 =
snmp_engine__4SnmpFR3PdulT2RC10SnmpTargetPFiP4SnmpR3PduR10SnmpTargetPv_vPCvi
+ 0x10B8

           10004ca0 = get__4SnmpFR3PduRC10SnmpTarget + 0x50

           1000b850 = main + 0x798

Oid = 1.3.6.1.2.1.1.1.0

Value = Cisco Internetwork Operating System Software

IOS (tm) c6sup2_rp Software (c6sup2_rp-DSV-M), Version 12.1(26)E4, RELEASE
SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Sat 15-

1546-525 Object 0x20108BD8 is invalid or a libc heap object at line 535 in
../include/snmp_pp/address.h

1546-522 Traceback:

           d9e383fc = _debug_ufree + 0x38

           d9e30a18 = _debug_free + 0x18

           d9e213d0 = ? + 0x44

           1000be38 = __dt__10UdpAddressFv + 0x8C

           1000c9c4 = __dt__10GenAddressFv + 0xB0

           1000c70c = __dt__10SnmpTargetFv + 0x74

           1000c34c = __dt__7CTargetFv + 0xB4

           1000b9f0 = main + 0x938

$



Can anyone help me how to avoid the memory fault?



Best regards,

Moore