Messages in this thread | | | From | Blaisorblade <> | Subject | Re: [uml-user] Harddisk Shutdown while UML Guest Shutdown | Date | Wed, 3 Nov 2004 22:09:52 +0100 |
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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@yahoo.it> 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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