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Re: What is wrong with this program?



I will try out the included code stub under Solaris on Tuesday of
this coming week, when I am back at the office...just so ppl know that I
am lurking out here ;)

On Sat, 3 Oct 1998, Andrew Morgan wrote:

> 
> [Ulrich, I've Cc:d you since this is a problem with the libdl-2.0.7.so
> in my Red Hat 5.1 system which seems to be part of the glibc package.]
> 
> Mihai,
> 
> Phew.  I thought for a little while you had found a bug in libpam! 8^]
> 
> Mihai Ibanescu writes:
> > On Thu, 1 Oct 1998, Andrew Morgan wrote:
> > > I'll play with this and get back to you, but first could I have some
> > > more info....
> 
> > 	One more info: the bug is in SUN's Pam API too. The history is
> > like this:
> 
> I can't speak for Sun's dlopen/dlclose and/or their libpam (anyone got
> the source?), so the bug there may well be some other problem.
> 
> However, I'm basically convinced that this is a dlopen/dlclose issue.
> Here is another program for you to try.  Please note, there is no PAM
> involved here and the shared library chosen for the dlopen call does
> not seem to be important:
> 
> ==============
> /*
>  * memory leak in libdl.1.7.14 and /lib/libdl.so.2
>  * (under libc and glibc).
>  */
> 
> #include <dlfcn.h>
> 
> main()
> {
>     int i=10000;
> 
>     while (i-->0) {
> 	void *x = dlopen("/lib/libtermcap.so.2", RTLD_GLOBAL);
> 	printf("x=%p\n", x);
> 	dlclose(x);
>     }
> }
> 
> /*
>  * compile with:  cc -o test test.c -ldl
>  */
> ==============
> 
> Running this against either of the above libdl's (with libc5 and glibc
> respectively) seems to exhibit the memory leak.  The process grows as
> witnessed by running top.
> 
> > - Yesterday I've checked it myself. Discovered that indeed there is a
> > memory leak. Started to RTFM. Nothing obviously wrong.
> > 
> > - Made the small program I've sent on the list.
> > 
> > 	It should be reproducible.
> 
> It was and thanks for posting this...
> 
> Anyone have any idea what libdl is doing?  Know how to fix it?
> 
> Cheers
> 
> Andrew
> 
> -- 
> To unsubscribe: mail -s unsubscribe pam-list-request@redhat.com < /dev/null
> 

Marc G. Fournier                               scrappy@hub.org
Systems Administrator @ hub.org                    
scrappy@{postgresql|isc}.org                       ICQ#7615664



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