From owner-freebsd-alpha  Tue Oct 30  7:32: 7 2001
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Date: Tue, 30 Oct 2001 07:31:51 -0800 (PST)
From: John Baldwin <jhb@FreeBSD.org>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Subject: Re: Linuxulator MFC candidate for testing
Cc: alpha@FreeBSD.ORG, Marcel Moolenaar <marcel@xcllnt.net>
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On 30-Oct-01 Andrew Gallatin wrote:
> 
> Marcel Moolenaar writes:
>  > 
>  > The one thing that comes to mind is linux_clone. If the cloning
>  > doesn't work right, there's no process to deliver a signal.
>  > 
>  > Can you test with the changes to linux_clone reverted?
> 
> We have a winner.  If I revert all of the meaningful changes to
> linux_clone, things still work.   Reverting just the
> 'Make this runnable after we are finished with it' changes:
> 
>         /*
>          * Make this runnable after we are finished with it.
>          */
>         p2->p_stat = SRUN;
>         setrunqueue(p2);
> 
>         p->p_retval[0] = p2->p_pid;
>         p->p_retval[1] = 0;
> 
> lead to the jvm seg-faulting.  Going back to rfork/pfind from fork1
> leads to a runnable jvm.

That should probably only be done on -current as it is only a race condition on
-current.  In -stable the kernel isn't preemptive, so it's safe to not do that.

> Hmm.. something appears to be hosed about whoami:
> 
> <9:32am>monet/gallatin:/tmp>whoami 
> gallatin
> <9:32am>monet/gallatin:/tmp>/compat/linux/usr/bin/whoami
> root
> 
> 
> This worked fine pre-patch & ktrace's look identical.
> I'm about out of time for now...
> 
> 
> Drew

-- 

John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/
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