On Dienstag, 30. Mai 2017 09:14:31 CEST Hans de Goede wrote: > On 29-05-17 17:28, Frank Mehnert wrote: > > On Montag, 29. Mai 2017 16:58:28 CEST Frank Mehnert wrote: > >> Hi Hans, > >> > >> On Montag, 29. Mai 2017 16:22:09 CEST Hans de Goede wrote: > >>> [...] > >>> > >>> Ok, can you try install a 4.12 kernel, e.g.: > >>> > >>> https://koji.fedoraproject.org/koji/buildinfo?buildID=892258 > >>> > >>> Download kernel-core... and kernel-modules... and then do > >>> rpm -ivh kernel*.rpm > >>> as root from a dir with the 2 downloaded files and boot > >>> that on that skylake host (see below). > >> > >> thanks, your investigation was very helpful. Now I'm able to reproduce the > >> problem with Fedora 25 with a 4.12-rc kernel on a Skylake host. > > > > adding 'noxsave' to the kernel command line is a workaround. > > Yes that works, thank you.
we did a bit more debugging. It really looks like this is a kernel bug. It looks like the kernel wants to warn early about XSTATE_WARN_ON(paranoid_xstate_size != fpu_kernel_xstate_size); (arch/x86/kernel/fpu/xstate.c:596) but for some reason this warning becomes a panic and, even worse, no text is displayed at all. The kernel is finally waiting in hlt. Same problem with rc3 (using the 4.12.0-0.rc3.git1.1.fc27.x86_64 packages). Adding 'noxsave' is a workaround because it prevents the kernel from using xsave at all. Again, this is not a VirtualBox bug although this panic will probably not happen on real hardware. Kind regards, Frank -- Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox ORACLE Deutschland B.V. & Co. KG | Werkstr. 24 | 71384 Weinstadt, Germany ORACLE Deutschland B.V. & Co. KG Hauptverwaltung: Riesstraße 25, D-80992 München Registergericht: Amtsgericht München, HRA 95603 Komplementärin: ORACLE Deutschland Verwaltung B.V. Hertogswetering 163/167, 3543 AS Utrecht, Niederlande Handelsregister der Handelskammer Midden-Niederlande, Nr. 30143697 Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher _______________________________________________ vbox-dev mailing list [email protected] https://www.virtualbox.org/mailman/listinfo/vbox-dev
