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From "J.Lance Wilkinson" <jl...@psu.edu>
Subject Re: [users@httpd] Compiled/linked executable CGI script crashes when run as CGI, runs to completion when run outside HTTPD
Date Mon, 03 Dec 2012 15:28:55 GMT
Jeff Trawick wrote:
> Run under valgrind from the shell, and if that doesn't work create a 
> wrapper script to be the CGI and use the wrapper script to invoke the 
> real CGI under valgrind in that environment.

	Tried that already:  (executable is /.../request; paths shortened and
				valgrind line wrapped for brevity)

#!/bin/sh
valgrind --leak-check=full --track-origins=yes  \
    --log-file=/.../logs/valgrind.request.log /.../request

	CGI script runs to completion.


>     El 03/12/12 15:37, J.Lance Wilkinson escribió:
> 
>         Title pretty much says it all.
> 
>         HTTPD is 2.2.15 on RHEL6.
> 
>         Executable aborts, log files show glibc detected memory issues
>         (messages vary).
>         Run same executable outside of the CGI environment, on the same
>         host and under an unprivileged user (can't run as "apache"
>         because that's not a real ID, my sysadmin says), duplicating all
>         input, under a debugger and not under a debugger, and it runs to
>         completion with no errors.
> 
>         What could HTTPD as the parent environment be imposing that
>         would cause the aborts when they don't occur outside of Apache?
>          I speculated some ulimit kind of thing resulting in less memory
>         actually being available for the thousands of malloc() calls the
>         executable performs.


-- 
J.Lance Wilkinson ("Lance")		InterNet: Lance.Wilkinson@psu.edu
Systems Design Specialist - Lead	Phone: (814) 865-4870
Digital Library Technologies		FAX:   (814) 863-3560
E3 Paterno Library
Penn State University
University Park, PA 16802
http://ucs.psu.edu/home/jlw12@psu.edu?fmt=freebusy


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