Re: BUG: wedged processes, test program supplied

From: Mike Galbraith
Date: Wed Dec 20 2006 - 02:14:00 EST

On Wed, 2006-12-20 at 01:05 -0500, Albert Cahalan wrote:
> On 12/20/06, Mike Galbraith <efault@xxxxxx> wrote:
> > On Tue, 2006-12-19 at 21:46 -0500, Albert Cahalan wrote:
> > > Somebody PLEASE try this...
> >
> > I was having enough fun with cloninator (which was whitespace munged
> > btw).
> Anything stuck? Besides refusing to die, that beast slays debuggers
> left and right. I just need to add execve of /proc/self/exe and a massive
> storm of signals on the alternate stack.

Usually, I can kill the misbehaving strace or abandoned cloninators if
it decides to take a hike, but sometimes it leaves corpses lying around.

> Oh. I wanted to be sure you'd see the problem. Did you have
> some... difficulty? A plain old ^C should make things stop.
> The second test program is like the first, but missing SIGCHLD
> >from the clone flags, and hopefully not whitespace-mangled.
> Note that the test program is not normally a fork bomb.
> It self-limits itself to 42 tasks via a lock in shared memory.
> If things are working OK, you should see no more than
> about 60 tasks.

I didn't take any countermeasures.. had ~27000 zombies.


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