Re: [uml-user] Harddisk Shutdown while UML Guest Shutdown

[Roland Kaeser]

Hello 

Here comes the Test report for the UML SKAS and User run Tests

If I run the UML Kernel without the HOSTS SKAS Patch, it works normally, no hd
shutdown!

If i run the UML Kernel with the HOSTS SKAS Patch but as "normal" user, it works
also normally, without any harddisk shutdown!

It seems more and more to be a kind of bug in the UML Patch which allows the uml
kernel to call kernel functions on the host kernel.

Roland



 --- Blaisorblade <blaisorblade_spam@xxxxxxxx> schrieb: 
> On Wednesday 03 November 2004 20:21, Roland Kaeser wrote:
> > Hello
> >
> > Thank You for Your answer. But my host kernel is a 2.6.7 with the skas
> > patch. The guest is a 2.6.9. Just an another info: The behaviour does not
> > depend on the hostfs configuration. It also happens when I use a ubd
> > device.
> 
> > And no, the HOST!! freezes after exit of the guest kernel.
> 
> > And i get a 
> > Kernel panic from the HOST!! kernel, this in case the host (ide) harddisk
> > drive spins down (but not spins up anymore).
> Yes, I already understood this.
> 
> > My idea is that some routines 
> > to spin down the harddisk are been routed outside the uml guest kernel or
> > not been sucessfully removed for the uml architecture.
> 
> > Is it possible that 
> > the /sbin/halt binary can have made something with the hosts harddisk?
> I don't think that /sbin/halt itself can do anything. I would be suspicious of 
> hdparm, instead. It would be a UML bug anyway, but it's the more likely thing 
> it's possible to cause this.
> 
> > How can i get the kernel panic message from the host?
> 
> If you are on a virtual console, you see them on your screen. Otherwise, how 
> did you guess you have a kernel panic? Messages on /var/log/messages (I guess 
> no)? Or what?
> 
> > Roland
> 
> >  --- Blaisorblade <blaisorblade_spam@xxxxxxxx> schrieb:
> > > On Wednesday 03 November 2004 08:53, Roland Kaeser wrote:
> > > > Hello
> 
> > > > I starting the UML Kernel with the following command:
> 
> > > > /install/uml/kernel/vmlinux mem=128M devfs=nomount con=xterm
> > > > eth0=tuntap,,,1.1.1.1 eth1=tuntap,,,2.2.2.2 root=/dev/root
> > > > rootflags=/install/uml/instances/hostfc2install rootfstype=hostfs
> 
> > > > The system starts up successfully, and opens all the xterm for the
> > > > consoles. I can login and work with the guest system.
> > > > Then I shut down the guest system from inside the guest system using
> > > > the command init 0 or shutdown.
> 
> > > > The guest shuts down normally.
> > > > But in the moment when the uml kernel exits in the xterm where I
> > > > started it, I CAN HEAR the harddisk of the host goes down.
> 
> > > Ok, with this explaination, I can believe that this happens. Sorry for my
> > > first answer, I first took the most likely idea, i.e. the hard disk spins
> > > down because it's no more used, but the host kernel is still alive and
> > > kicking, and the hard drive will spin up when needed. Anyway, this
> > > description, w
> 
> > > You are using a vanilla host kernel (2.6.9), so you have no SKAS patch
> > > running, i.e. this is a host kernel bug, actually, and it is pretty
> > > severe. Attach your .config in next email.
> 
> > > Can you please report that (including the kernel panic message) to LKML,
> > > CC:ing the -devel list? Also, could you try that with different host
> > > kernels? Different setups? Are you running your UML as root or not? If
> > > you are running it as root, then try running it with an unprivileged
> > > userid.
> 
> > > > After this, nothing happens more on the host, even the mouse freezes. I
> > > > cannot start an other program or even access the harddisk or login on a
> > > > other tty.
> 
> > > > It freezes the whole guest system.
> 
> > > You mean obiously the "host" system (i.e. the hardware one; "guest"
> > > refers to the UML instance).
> 
> > > > About a minute later I get a
> > > > Kernel Panic from the host kernel
> 
> > > Try to copy and send the text of the panic, (most of the numbers can be
> > > omitted, even because they are often hard to decode; the list of function
> > > calls is more important than anything else).
> 
> -- 
> Paolo Giarrusso, aka Blaisorblade
> Linux registered user n. 292729
> 
> 
> 
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