[PATCH] elf: Release dl_load_lock before running dlopen constructors (BZ 15686)

[Alexander Pevzner]

Hi!

On 7/13/26 8:43 AM, Florian Weimer wrote:

> I believe this results in a data race on l_init_called.  In a
> multi-threaded application, the same ELF constructor may execute with
> itself in parallel on different threads, or dlopen may return before the
> ELF constructor has completed running in another thread.  Some form of
> synchronization is required to deal with these scenarios, perhaps using
> pthread_once or a condition variable.

I don't quite understand how could it happen. Constructors are running 
on a context of the thread that called dlopen, and should all complete 
before dlopen is finished and returned.

> We also likely cannot remove a lock like this for old applications which
> may depend on its existence.  We can deal with this with a different
> mechanism.

What visible change in behavior do you expect?

-- 

	Wishes, Alexander Pevzner (pzz@apevzner.com)