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

[Gianni Tedesco <gianni.tedesco@xxxxxxxxxx>]

On Mon, 2010-07-12 at 15:04 +0100, Konrad Rzeszutek Wilk wrote:
> On Wed, Jul 07, 2010 at 07:42:35PM +0100, Gianni Tedesco wrote:
> > Hi,
> > 
> > I've spent a few weeks investigating a very reproducible guest-hangs bug
> > which appears to affect all hypervisors from at least 3.4.2 through 4.0
> > to unstable.
> > 
> > To reproduce setup an RHEL5.2 guest for kickstart network install
> > something like this:
> 
> Does this happen with RHEL5.4? CentOS 5.4?

I used the same setup to test RHEL5, RHEL5.[1234] and can only reproduce
on 5.1 and 5.2.

As George pointed out, this may be an issue with a far wider range of
kernels but difficult to reproduce.

My most recent finding is that this is reproduced by loading modules
which create a kernel thread. A sysrq-t during the hangs is showing
every task waiting for kthread_create to complete except for anaconda
which is either waiting on a tty_ioctl() (serial install) or poll (vga
install).

Gianni Tedesco


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