Re: [uml-devel] unkillable UML threads

[Jan Hudec <bulb@ucw.cz>]

On Sat, Oct 11, 2003 at 00:15:47 -0400, Matt Zimmerman wrote:
> On Mon, Oct 06, 2003 at 05:18:54PM -0400, Jeff Dike wrote:
> 
> > mcr@sandelman.ottawa.on.ca said:
> > > FYI: This is without the skas patch, with a stock RH9 kernel on the
> > > host.
> > >
> > > Any thoughts or coroboration would be appreciated. Clearly this is a
> > > bug in the RH9 kernel.  
> > 
> > It could easily be a UML bug.  I do have code which continues threads
> > so that they die properly, but it seems not to be happening here.  Can
> > you tell me how to reproduce it?
> 
> I know of no reliable way to reproduce it, but I commonly do things like
> "killall linux" and end up with a suspended process left behind.  Maybe it
> has something to do with multiple threads receiving the signal?  I think it
> has also happened when killing only the first process, but I can't test
> right now.

The way out is to also kill with SIGCONT signal. Since umlinux uses
tracing a lot, some processes are often stopped. When you kill the
tracer while it's victim is stopped, it's not awoken. So you have to do
it yourself.

-------------------------------------------------------------------------------
						 Jan 'Bulb' Hudec <bulb@ucw.cz>


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