RE: [Xen-devel] HVM SMP linux guest hangs in cpu_idle() with EFLAGS.IF = 1

[Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>]

On Wed, 2010-07-21 at 18:56 +0100, Nakajima, Jun wrote:
> Gianni Tedesco wrote on Wed, 21 Jul 2010 at 10:29:43:
> 
> > Another data-point I have on this but haven't mentioned here yet is that
> > the userspace (anaconda) processes are usually hanging in
> > tty_wait_until_sent() which is apparently why things are woken up by
> > receiving a keypress on the serial line.
> > 
> > At other times the hang occurs while userspace (hotplug, also anaconda)
> > is waiting in do_poll() on a kernel netlink socket. In that case a
> > keypress on serial line also wakes it (!!)
> >
> 
> I'm not sure if I followed all the emails on the thread, but did you
> see such a hang without serial connection? I had impression (i.e. kind
> of remember) serial connection of Linux at boot time caused a hang
> especially with SMP (on native). 

I have seen the hang without serial console enabled but with serial
still attached... In that case the hangs still happen but much more
rarely. I am going to try some further tests to remove serial from the
equation and see what happens.

Thanks for the hint


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