Re: lib/49816: rtld internal lock vs fork

[yamt%netbsd.org@localhost (YAMAMOTO Takashi)]

>  > 	when a thread does fork(2), some other thread might hold _rtld_mutex.
>  > 	in that case, the child process will likely deadlock soon because
>  > 	of non-zero _rtld_mutex.  i've observed the problem with open vswitch.
>  
>  Non-zero _rtld_mutex by itself should not be problem. The problem exists
>  if another thread requires the exclusive lock. I do plan to rewrite rtld
>  at some point to never require an exclusive lock for symbol look up, but
>  that's far from trivial. In the old world before locking, you would just
>  hit race conditions or not.

i agree on all points.

and, at least in my case, "another thread requires the exclusive lock"
actually happens.

YAMAMOTO Takashi