Re: kern/56276: exit hangs with vfork waiting

[Michael van Elst <mlelstv%serpens.de@localhost>]

On Fri, Jun 25, 2021 at 05:35:01AM +0000, David Holland wrote:

>  On Fri, Jun 25, 2021 at 04:30:01AM +0000, mlelstv%netbsd.org@localhost wrote:
>   > When a process calls vfork(), it is suspended until the child exits
>   > or calls execve().
>   > 
>   > When in this situation, a second thread of the parent calls exit()
>   > the parent doesn't exit but waits uninterruptibly for the child.
>  
>  Shouldn't all threads be suspended for vfork? (as for regular fork)

I would guess exit() races with vfork(). The second thread was almost
done and waits for the other threads to finish so that it can then
release the process resources.


Greetings,
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."