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Re: xen master: xl create hangs
- To: Mathieu Tarral <mathieu.tarral@xxxxxxxxxxxxxx>
- From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Date: Wed, 20 Jul 2022 17:24:22 +0100
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- Cc: Xen-users <xen-users@xxxxxxxxxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>, George Dunlap <dunlapg@xxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 20 Jul 2022 16:24:44 +0000
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On Wed, Jul 20, 2022 at 03:04:22PM +0000, Mathieu Tarral wrote:
> Hi Anthony
>
>
> > $(debug) controls the level of optimisation of the compilation to make
> > it easier to debug.
> >
> > So, with debug=y, we have libxenstore having issue with killing the
> > its reading thread? :-(
> > Maybe that reading thread is doing something that can't be stopped,
> > maybe it's waiting for a lock. Could you try to print a back trace of
> > that thread (or even all thread in `xl`)? ("thread apply all bt full" in
> > gdb)
>
> I recompiled the buggy master, and this is the full GDB stacktrace when xl
> create hangs:
> https://gist.github.com/Wenzel/969d5c06982246cd6cb2eb8cdf252a18
>
> I don't see the same stacktrace as before, maybe I was on a different commit ?
I think that this `xl` process just wait for the domain to shutdown
or die. When we run `xl create`, before exiting there's a fork/exec of
xl which handle a few domain events, so it looks like this stack trace
is expected (and look like the one I have). So it don't looks like to be
the xl process that hangs.
--
Anthony PERARD
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