[Bug dynamic-link/16628] Segfault after a binary without pthread dlopen()s a library linked with pthread

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16628

Florian Weimer <fweimer at redhat dot com> changed:

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                 CC|                            |fweimer at redhat dot com

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Carlos O'Donell from comment #3)
> (In reply to Rich Felker from comment #2)
> > My understanding is that this usage is explicitly unsupported. However, if
> > that's the case, it should fail cleanly (with the error message in dlerror)
> > rather than crashing or exiting the program so I believe this bug report is
> > valid.
> 
> My understanding was, and we have tests in the testsuite to test this, that
> dlopening libpthread is allowed. Why would we disallow this?

The pthread_mutex_init stub in libc.so.6 does nothing, so the mutex will
contain garbage.  This works fine as long as only the stubbed version of
pthread_mutex_lock is used (which also does nothing).  But the process will
crash once the stubs are replaced with the real thing because libpthread.so.0
has been loaded into the process.

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