Re: [PATCH] exec: Make do_coredump more robust and safer when using pipes in core_pattern

Neil Horman
2009-07-29T20:19:14Z

On Wed, Jul 29, 2009 at 04:13:02PM +0100, Scott James Remnant wrote:
> On Mon, 2009-06-22 at 13:28 -0400, Neil Horman wrote:
>
> > 2) Allow for the kernel to wait for a core_pattern process to complete. One of
> > the things core_pattern processes might do is interrogate the status of a
> > crashing process via its /proc/pid directory. To ensure that that directory is
> > not removed prematurely, we wait for the process to exit prior to cleaning it
> > up.
> >
> Would this mean that the kernel would wait for the pattern process to
> complete before PANIC in the case of init core dumping?
>
> I'd find that useful :-)
>
Not without additional work. If init crashed in the initramfs, I don't think
theres a way to handle that. If it crashes at some later time, I think it just
gets restarted IIRC. I'm sure you can change that behavior, but this patch
doesn't address that.

If you want to debug a custom init process, why not run a wrapper program as
init, that just forks the init you want to run and captures the core when it
crashes?
Neil

> Scott
> --
> Scott James Remnant
> scott@canonical.com