Bug#233301: linker reference count error among dependencies of dlopen()ed object

[GOTO Masanori <gotom@debian.or.jp>]

At Tue, 24 Feb 2004 13:14:08 -0600,
Steve Langasek wrote:
> > I don't understand what the problem exists...  Could you provide short
> > summary and tell us what the bug is, plus small sample program?  PHP
> > based issue is hard to reappear for me, and relaxing complex program
> > dependency is good step to resolve bug, I think.
> 
> Working with Jeff Bailey, I've put together a test case that shows this
> problem.
> 
>   http://people.debian.org/~vorlon/test.tar.gz
> 
> Build the application, and strace it -- you will see that the call to
> dlclose() results in munmap() calls for the addresses of only 3 of the
> four shared objects that were mapped by dlopen().  The one at the bottom
> of the dependency tree, libd.so, is still in memory.

I confirmed that /proc/<pid>/maps showed libd.so after dlclose().
Interestingly, however, this problem is occured on kernel 2.4.21-4-686
machine, but not on 2.6.1 machine.

Regards,
-- gotom