From: Jan Hudec <bulb@ucw.cz>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] unkillable UML threads
Date: Thu, 16 Oct 2003 22:15:10 +0200 [thread overview]
Message-ID: <20031016201510.GA31337@vagabond> (raw)
In-Reply-To: <20031011041547.GH13041@dijkstra.csh.rit.edu>
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.
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Jan 'Bulb' Hudec <bulb@ucw.cz>
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next prev parent reply other threads:[~2003-10-16 20:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-24 12:40 [uml-devel] unkillable UML threads Michael Richardson
2003-09-24 14:30 ` Matt Zimmerman
2003-09-25 14:40 ` Michael Richardson
2003-10-06 21:18 ` Jeff Dike
2003-10-07 1:09 ` Michael Richardson
2003-10-07 3:20 ` Jeff Dike
2003-10-07 23:39 ` Michael Richardson
2003-10-11 4:15 ` Matt Zimmerman
2003-10-16 20:15 ` Jan Hudec [this message]
2003-10-16 20:32 ` Matt Zimmerman
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