Re: [BProc] pthreads & bproc, round 2

[<er...@he...>]

On Wed, Jul 09, 2003 at 01:41:11PM -0400, Nicholas Henke wrote:
> On Mon, 2003-07-07 at 15:20, er...@he... wrote:
> > I have a hunch about what might be going on here.  There's some
> > potential for badness in exit_notify with BProc.  kill_pg and
> > is_orphaned_pgrp might end up setting the process state back to
> > RUNNING instead of ZOMBIE.  Then they could get hung up because the
> > ghost is gone because it's already exited.
> > 
> > I've attached a revised patch which I think should fix that.  Can you
> > try it an see if it helps?
> 
> It seems to have helped, but not solved the problem. It seems like more
> of the processes are running, and not getting hung, but there were a few
> that did hang. I was able to do a 'top->bottom' kill -9 with a 'sleep 1'
> between, and in one case it worked, but in another, I had to go to the
> node again and kill -9 the process there.

Well, that's encouraging at least.  There's definitely some bogosity
fixed by that patch but I guess there's more.

Are you still getting processes which are unkillable w/ signal 9?  The
processes that you had to go and kill on the node, they were gone from
the master's process tree, right?

Here's another thing to try as a diagnostic.  Comment out this line in
daemons/master.c

                do_parent_exit(req);

I think there might be something sketchy going on with that code
although I'm don't know exactly what.  Removing the "parent exit"
stuff will have some implications for correctness - getppid() might
return the wrong answer if your parent was on another node and it has
exited.  It *shouldn't* have any implications beyond that, however.

I need to try to replicate this problem again.

- Erik