Re: socketcall.sendmsg(msg.msg_control) points to uninitialised byte(s)

Recompiling everything, was one of the first things I've tried. The problem
started in fact when I upgraded the gcc compiler. So then I upgraded all the
libraries also and rebuild everything. I upgraded net-snmp from 5.4 to
5.4.1. I also tried switching back to 5.4, but I still get the problem.

I'm really puzzled what the cause of this problem is and I've spent already
2 days looking for it. Let me try to explain a bit better what happens
exactly:
- I have a function snmpget, where I call snmp_send. This is where I get the
valgrind warning.
- It's an asynchronous call. So a bit later, I call the callbackfunction.
There it looks normal, I get my snmpvalues as expected. But I get a
segmentation fault when I exit the calling function.

So I suspect that the origin of the crash is the problem in the valgrind
warning.

When I debug, I see the following:
snmp_sess_async_send (sessp=0xb461c08, pdu=0xb6d2008, callback=0,
cb_data=0x0) at snmp_api.c:4892

And when sendmsg is called I see:
netsnmp_udp_send (t=0xb469098, buf=0xb474255, size=51, opaque=0xb6cd2b4,
olength=0xb6cd2b8) at snmpUDPDomain.c:249

The parameters look normal, right?


2008/6/3 Dave Shield <[email protected]>:

> 2008/6/3 Largo <[email protected]>:
> > I have a program which makes use of the net-snmp 5.4.1 API. This program
> > worked fine until recently. I've updated some libraries (including
> net-snmp)
> > and now my program crashes because of a segmentation fault.
>
>
> > The parameter values used in snmp_send seem to be ok. If I comment out
> the
> > snmp_send line, my program does not crash.
> >
> > Anybody an idea what the problem could be or what I can do to find the
> > source of the problem?
>
> Run the program under a debugger, and trigger the crash.
> Then look at the code in snmp_sess_async_send()
> and see if you can spot anything suspicious in the
> parameters to the sendmsg() call.
>
> It might also be worth re-compiling the 'poller' application,
> to make sure it's linking with the Net-SNMP libraries correctly.
>
> You say that you've upgraded the Net-SNMP libraries recently?
> From what version?
>
> Dave
>

-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/

_______________________________________________
Net-snmp-users mailing list
[email protected]
Please see the following page to unsubscribe or change other options:
https://lists.sourceforge.net/lists/listinfo/net-snmp-users