RE: how to purify net-snmp code

#1 (**permalink**) 03-30-2007

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Devi,

=20

Please find my inline comments.

Regards,=20
Santhosh=20

________________________________

From: Devi U [mailto:udevi@TechMahindra.com]=20
Sent: Friday, March 30, 2007 3:22 PM
To: SANTHOSH S (WT01 - Broadband Networks);
net-snmp-coders@lists.sourceforge.net
Subject: RE: how to purify net-snmp code

=20

=20

=20

Hi,

=20

Very Sorry for my late reply. I was assigned to other works and back to
this problem now.

after freeing varbind, memory usage was not reduced.

=20

we are sending traps only and traps are received properly in management
system configured.(Verified thro' Advent Net Manager - Trap viewer)

I have cross verified with other implementations and i cant find any
problem in our implementation.

=20

Using gdb , I have identified that out of 40 K=20

1. 8K is increased in method -=20

=20

agent/agent_trap.c - send_trap_to_sess(netsnmp_session * sess,
netsnmp_pdu *template_pdu)

=20

we are using net-snmp version 5.3.0.1 and line 881 /*
snmp_free_pdu(pdu); */ is commented.

In net-snmp version 5.4 it is uncommented.

[Santhosh] we used 5.2.1. This might be the issue, Uncomment
snmp_free_pdu() in 5.3.0.1 and verify.

=20

2. 32 K ( increasing by 8 K for every call,this method is called in for
loop ) is increased in method -=20

agent/helpers/table_dataset.c -
netsnmp_set_row_column(netsnmp_table_row *row, unsigned int column,
int type, const char
*value, size_t value_len)

=20

I doubt whether memory allocated and pointed to by row is freed or
not.

=20

=20

Code flow to netsnmp_set_row_column=20

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

#0 netsnmp_set_row_column (row=3D0x187a8b8, column=3D3, type=3D2,
value=3D0xffbfeb74 "", value_len=3D4)
at table_dataset.c:1224
#1 0xff2c226c in log_notification (pdu=3D0x181dfa8, transport=3D0x3408)
at notification-log-mib/notification_log.c:687
#2 0xff2bcc0c in send_notifications (major=3D2136456, minor=3D7,
serverarg=3D0x2ffd08,
clientarg=3D0xff304fe8) at notification/snmpNotifyTable.c:260
#3 0xff15ace0 in snmp_call_callbacks (major=3D1, minor=3D7,
caller_arg=3D0x2ffd08) at callback.c:323
#4 0xff3688b0 in netsnmp_send_traps (trap=3D-1, specific=3D-1,
enterprise=3D0xff392a64,
enterprise_length=3D10, vars=3D0x2209320, context=3D0x0, flags=3D0) =
at
agent_trap.c:783
#5 0xff3689d0 in send_enterprise_trap_vars (trap=3D-1, specific=3D-1,
enterprise=3D0xff392a64,
enterprise_length=3D10, vars=3D0x2209320) at agent_trap.c:797
#6 0xff29d0bc in send_eventTrap_trap () at ssg/ssg.c:1349 <------ Here
we called send_v2trap
#7 0xff15d940 in run_alarms () at snmp_alarm.c:251 =20

[Santhosh] Are you adding any OID to trap var bind which is defined
as/under table? To isolate the issue remove table varbinds in trap PDU
and see the memory usage.=20

If with out any table OID added in the trap memory size reduced, then
the issue is with the dataset (you might have used
mib2c.create-dataset.conf template to implement your private table).=20

=20

=20

Thanx,

Devi.U

=20

________________________________

From: santhosh.sundarasamy@wipro.com
[mailto:santhosh.sundarasamy@wipro.com]
Sent: Wed 3/14/2007 12:08 PM
To: Devi U; net-snmp-coders@lists.sourceforge.net
Subject: RE: how to purify net-snmp code

=20

Devi,
After freeing varbind, usage should decrease; PDU is already
freed in netsnmp_send_traps() itself ( invoked by send_v2trap). Sending
trap or inform? Are you receiving the traps in trapd? Cross check the
API usage in other implementations (grep send_v2trap `find . -name
"*.c"`)

We used method similar to apps/snmptrap.c and there is no memory
usage raised / leaks. Pls refer snmptrap.c file for session creation &
deletion.

-
Santhosh

________________________________________
From: Devi U [mailto:udevi@TechMahindra.com]
Sent: Tuesday, March 13, 2007 7:30 PM
To: SANTHOSH S (WT01 - Broadband Networks);
net-snmp-coders@lists.sourceforge.net
Subject: RE: how to purify net-snmp code

=20
Santhosh,
=20
Thanx for ur immediate response.
followed the same example - /examples/notification.c
=20
snmp_free_varbind is called in our code after send_v2trap().
=20
In top output, i can see the size remains same even after
snmp_free_varbind() is called.should size decrease after free is called?
=20
For every 100 msec, callback will be called,snmp_varlist_add_variable()
is used to store the variables and send_v2trap() is called for sending a
single trap.
=20
I dont know how to create session / send all traps in a single session.
=20
Thanx,
Devi.U
________________________________________
From: santhosh.sundarasamy@wipro.com
[mailto:santhosh.sundarasamy@wipro.com]
Sent: Tue 3/13/2007 7:03 PM
To: Devi U; net-snmp-coders@lists.sourceforge.net
Subject: RE: how to purify net-snmp code

Hi Devi,
The increase shown in top is memory usage by the application;
all increased bytes might have not been leaked.

You need to free the varbinds after sending each trap/inform.
snmp_free_varbind(notification_vars);
refer:
http://www.net-snmp.org/dev/agent/no...c-example.html =20

Print the "top" output after freeing varbind and check the
usage.

Are you using single session to send all trap/inform or creating
session before sending each inform/trap?

-
Santhosh
________________________________________
From: Devi U [mailto:udevi@TechMahindra.com]
Sent: Tuesday, March 13, 2007 6:44 PM
To: net-snmp-coders@lists.sourceforge.net
Cc: SANTHOSH S (WT01 - Broadband Networks)
Subject: RE: how to purify net-snmp code

Hi,
=20
thanx santhosh..
I am able to purify the code..
=20
I feel that memory leak is there when send_v2trap is called, but i am
not getting any MLK/PLK in traces
=20
top display:
=20
26760 root 1 0 19 9248K 5608K run 0:01 0.30% snmpd
=20
top display after a trap is sent =3D=3D=3D> for each trap sent there is =
a
increase of 40K in SIZE and goes upto 50M.
26760 root 1 0 19 9288K 5648K run 0:01 0.31% snmpd
=20
we are using net-snmp version 5.3.0.1.
=20
whether above increase in SIZE is memory leak?
=20
Thanx,
Devi.U

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<div class=3DSection1>

Devi,<o:p></o:p>

<o:p> </o:p>

    &nbsp ;   &nbs=
p;   Please
find my inline comments.<o:p></o:p>

<div>

Regards, 
Santhosh <o:p></o:p>

</div>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</div>

From: Devi =
U [mailto:<st1:PersonName
w:st=3D"on">udevi@TechMahindra.com</st1:PersonName>] 
Sent: Friday, March 30, =
2007 3:22
PM 
To: SANTHOSH S (WT01 - =
Broadband
Networks); <st1:PersonName =
w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName> 
Subject: RE: how to =
purify
net-snmp code<o:p></o:p>

</div>

<o:p> </o:p>

<div id=3DidOWAReplyText47319>

<div>

 <o:p></o:p>

</div>

</div>

<div>

<div>

 <o:p></o:p>

</div>

<div>

Hi,<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

Very Sorry for my late reply. I was assigned to other =
works
and back to this problem now.<o:p></o:p>

</div>

<div>

after freeing varbind, memory usage was not =
reduced.<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

we are sending traps only and traps are received =
properly in
management system configured.(Verified thro' Advent Net Manager =
- Trap
viewer)<o:p></o:p>

</div>

<div>

I have cross verified with other implementations and =
i cant
find any problem in our implementation.<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

Using gdb  , I have identified that out of 40 K =
<o:p></o:p>

</div>

<div>

1. 8K is increased in method - =
<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

   agent/agent_trap.c -
send_trap_to_sess(netsnmp_session * sess, netsnmp_pdu =
*template_pdu)<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

   we are using net-snmp version 5.3.0.1 =
and line
881 /* snmp_free_pdu(pdu); */ is commented.<o:p></o:p>

</div>

<div>

   In net-snmp version 5.4 it is =
uncommented.<o:p></o:p>

[Santhosh] we
used 5.2.1. This might be the issue, Uncomment snmp_free_pdu() in =
5.3.0.1 and verify.<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

2. 32 K ( increasing by 8 K for every call,this =
method is
called in for loop )  is increased in method - =
<o:p></o:p>

</div>

<div>

   agent/helpers/table_dataset.c -
netsnmp_set_row_column(netsnmp_table_row *row, unsigned int column, 
        &n bsp;   &=
nbsp;       &nb sp;   
        &n bsp;   &=
nbsp;       &nb sp; 
int type, const char *value, size_t =
value_len)<o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

   I doubt whether memory =
allocated and
pointed to by row is freed or not.<o:p></o:p>

</div>

<div>

   <o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

Code flow to netsnmp_set_row_column =
<o:p></o:p>

</div>

<div>

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p>

</div>

<div>

#0  netsnmp_set_row_column (row=3D0x187a8b8, =
column=3D3,
type=3D2, value=3D0xffbfeb74 "", value_len=3D4) 
    at table_dataset.c:1224 
#1  0xff2c226c in log_notification (pdu=3D0x181dfa8, =
transport=3D0x3408) 
    at notification-log-mib/notification_log.c:687 
#2  0xff2bcc0c in send_notifications (major=3D2136456, minor=3D7, =
serverarg=3D0x2ffd08, 
    clientarg=3D0xff304fe8) at =
notification/snmpNotifyTable.c:260 
#3  0xff15ace0 in snmp_call_callbacks (major=3D1, minor=3D7,
caller_arg=3D0x2ffd08) at callback.c:323 
#4  0xff3688b0 in netsnmp_send_traps (trap=3D-1, specific=3D-1,
enterprise=3D0xff392a64, 
    enterprise_length=3D10, vars=3D0x2209320, =
context=3D0x0, flags=3D0)
at agent_trap.c:783 
#5  0xff3689d0 in send_enterprise_trap_vars (trap=3D-1, =
specific=3D-1,
enterprise=3D0xff392a64, 
    enterprise_length=3D10, vars=3D0x2209320) at =
agent_trap.c:797 
#6  0xff29d0bc
in send_eventTrap_trap () at ssg/ssg.c:1349 <------ Here =
we called
send_v2trap 
#7  0xff15d940 in run_alarms () at
snmp_alarm.c:251     <o:p></o:p>

[Santhosh] Are
you adding any OID to trap var bind which is defined as/under table? =
 To
isolate the issue remove table varbinds in trap PDU and see the memory =
usage. <o:p></o:p>

If with =
out any
table OID added in the trap memory size reduced, then the issue is with =
the
dataset (you might have used mib2c.create-dataset.conf template to =
implement
your private table). <o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

 <o:p></o:p>

</div>

<div>

Thanx,<o:p></o:p>

</div>

<div>

Devi.U<o:p></o:p>

</div>

<o:p> </o:p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabIndex=3D-1>

</div>

From:</spa=
n>
santhosh.sundarasamy@wipro.com =
[mailto:santhosh.sundarasamy@wipro.com] 
Sent: Wed 3/14/2007 12:08 =
PM 
To: Devi U; =
<st1:PersonName =
w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName> 
Subject: RE: how to =
purify
net-snmp code<o:p></o:p>

</div>

<div>

<o:p> </o:p>

Devi, 
        After freeing varbind, usage =
should
decrease; PDU is already freed in netsnmp_send_traps() itself ( invoked =
by
send_v2trap). Sending trap or inform? Are you receiving the traps in
trapd?  Cross check the API usage in other implementations (grep
send_v2trap `find . -name "*.c"`) 
 
        We used method similar to
apps/snmptrap.c and there is no memory usage raised / leaks. Pls refer
snmptrap.c file for session creation & deletion. 
 
- 
Santhosh 
 
________________________________________ 
From: Devi U [<a =
href=3D"mailto:udevi@TechMahindra.com">mailto:udev i@TechMahindra.com</a>]=
 
Sent: Tuesday, March 13, 2007 7:30 PM 
To: SANTHOSH S (WT01 - Broadband Networks); <st1:PersonName =
w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName> 
Subject: RE: how to purify net-snmp code 
 
  
Santhosh, 
  
Thanx for <st1:City w:st=3D"on"><st1:place =
w:st=3D"on">ur</st1:place></st1:City>
immediate response. 
followed the same example - /examples/notification.c 
  
snmp_free_varbind is called in our code after send_v2trap(). 
  
In top output, i can see the size remains same even after =
snmp_free_varbind()
is called.should size decrease after free is called? 
  
For every 100 msec, callback will be called,snmp_varlist_add_variable() =
is used
to store the variables and send_v2trap() is called for sending =
a
single trap. 
  
I dont know how to create session / send all traps in a single =
session. 
  
Thanx, 
Devi.U 
________________________________________ 
From: santhosh.sundarasamy@wipro.com [<a
href=3D"mailto:santhosh.sundarasamy@wipro.com">mai lto:santhosh.sundarasam=
y@wipro.com</a>] 
Sent: Tue 3/13/2007 7:03 PM 
To: Devi U; <st1:PersonName =
w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName> 
Subject: RE: how to purify net-snmp code 
 
Hi Devi, 
        The increase shown in top is =
memory
usage by the application; all increased bytes might have not been =
leaked. 
 
        You need to free the varbinds =
after
sending each trap/inform. 
       
       
snmp_free_varbind(notification_vars); 
        refer: <a
href=3D"http://www.net-snmp.org/dev/agent/notification_8c-example.html">h=
ttp://www.net-snmp.org/dev/agent/notification_8c-example.html</a>
  
 
        Print the "top" =
output
after freeing varbind and check the usage. 
 
        Are you using single session =
to send
all trap/inform or creating session before sending each inform/trap? 
 
- 
Santhosh 
________________________________________ 
From: Devi U [<a =
href=3D"mailto:udevi@TechMahindra.com">mailto:udev i@TechMahindra.com</a>]=
 
Sent: Tuesday, March 13, 2007 6:44 PM 
To: <st1:PersonName =
w:st=3D"on">net-snmp-coders@lists.sourceforge.net</st1:PersonName> 
Cc: SANTHOSH S (WT01 - Broadband Networks) 
Subject: RE: how to purify net-snmp code 
 
Hi, 
  
thanx santhosh.. 
I am able to purify the code.. 
  
I feel that memory leak is there when send_v2trap is called, but i =
am not
getting any MLK/PLK  in traces 
  
top display: 
  
26760 root       1   =
0   19
9248K 5608K run     0:01  0.30% snmpd 
  
top display after a trap is sent =3D=3D=3D> for each  trap sent =
there is a
increase of 40K in SIZE and goes upto 50M. 
26760 root       1   =
0   19
9288K 5648K run     0:01  0.31% snmpd 
  
we are using net-snmp version 5.3.0.1. 
  
whether above increase in SIZE is memory leak? 
  
Thanx, 
Devi.U 
 
 
The information contained in this electronic message and any attachments =
to
this message are intended for the exclusive use of the addressee(s) and =
may
contain proprietary, confidential or privileged information. If you are =
not the
intended recipient, you should not disseminate, distribute or copy this =
e-mail.
Please notify the sender immediately and destroy all copies of this =
message and
any attachments. 
 
WARNING: Computer viruses can be transmitted via email. The recipient =
should
check this email and any attachments for the presence of viruses. The =
company
accepts no liability for any damage caused by any virus transmitted by =
this
email. 
 
www.wipro.com 
 
 
The information contained in this electronic message and any attachments =
to
this message are intended for the exclusive use of the addressee(s) and =
may
contain proprietary, confidential or privileged information. If you are =
not the
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e-mail.
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