Re: [uml-devel] How to reliably kill all vmlinux processes for a single VM?

["Richard W.M. Jones" <rjones@redhat.com>]

On Mon, Aug 12, 2013 at 09:53:00AM +0100, Richard W.M. Jones wrote:
> On Mon, Aug 12, 2013 at 10:15:24AM +0200, richard -rw- weinberger wrote:
> > Found the root cause, patch is on the way.
> 
> I can test patches if you CC me on them.

I'm still available to test patches :-)  Didn't see anything on
this list nor on LKML.

In particular I'm having a problem where it looks as if vmlinux is
sending a signal to its parent process on shutdown.

I can reliably reproduce this, although not with anything very
minimal.  But if you run the libguestfs test suite like this you'll
see it:

  make -C tests/regressions check TESTS=rhbz914931

The parent process (a C program which for unrelated reasons is called
'rhbz914931') receives a SIGTERM.  I checked the siginfo struct for
this signal, and it appears to come from the vmlinux main process,
which should not be happening.

So .. possibly there's something awry with how vmlinux delivers
signals to its child processes on shutdown which is causing it both to
miss out some children, and to kill other unrelated processes.  Or
maybe this is just a coincidence.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
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