Re: Occasional hung with UM after enable VMAP_STACK

[Walter Lozano]

Hi Anton,

On 1/4/22 18:39, Anton Ivanov wrote:
> On 04/01/2022 19:26, Walter Lozano wrote:
> > Hi Johannes,
> >
> > On 1/4/22 16:04, Johannes Berg wrote:
> > > On Tue, 2022-01-04 at 15:10 -0300, Walter Lozano wrote:
> > > > Hi all,
> > > >
> > > > I noticed that after "um: enable VMAP_STACK" [1] I experienced some
> > > > occasional hung in my Gitlab CI jobs that use user-mode-linux to build
> > > > distro images.
> > > Did you actually *enable* VMAP_STACK in the config as well? The commit
> > > just makes it *possible* to enable it, you still have to set it
> > > yourself. So you should be able to easily check with/without that
> > > setting.
> >
> > Thank you for your quick response. The Debian configuration on 
> > package user-mode-linux have these settings
> >
> > CONFIG_HAVE_ARCH_VMAP_STACK=y
> > CONFIG_VMAP_STACK=y
> >
> >
> > as you can see in [1]. I did run some tests disabling those settings, 
> > which passed without any hung.
> >
> > Unfortunately the "occasional" behavior makes this issue a bit tricky 
> > to debug.
> >
> > Regards,
> >
> > Walter
> >
> > [1] 
> > https://salsa.debian.org/uml-team/user-mode-linux/-/blob/master/config.amd64#L321 
>
> Just to narrow things down - 64 bit or 32 bit?
Thank you for commenting on this thread. All my tests were done with 64 
bits.

Regards,

--
Walter Lozano
Collabora Ltd.