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From: Larry Adams <larryjadams AT comcast DOT net>
Subject:  Segfault in Cactid
Date: Fri, 2 Sep 2005 00:45:16 +0000 (UTC)
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Hello,

I have been working on an enhancement to the Cacti Groups snmp poller called 
Cactid and have been experiencing null pointer access violations in a system 
call with 1.5.18.1 that I am at my wit's end to trace down.  Here is the 
message that I get:

"Application popup: cactid.exe - Application Error : The instruction 
at "0x6108ed79" referenced memory at "0x00000000". The memory could not 
be "read"."

The address is always the same and is not in my application.  When I attach to 
the process and perform a backtrace, it shows a few calls inside of 
Cygwin1.dll, but I am not too sure how to determine what I am looking at, it's 
sad.

So my questions are: How do I trace the memory location above to a known system 
call using gdb?  When, I attach to my hung process, what should I be doing to 
determine the calling/offending function.

What I can tell you is that I do know enough to be able to determine problem 
functions in my program using gdb, but just not system calls.

Thanks in Advance,

Larry Adams
The Cacti Group
http://www.cacti.net


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