Messages in this thread | | | Date | Fri, 8 Aug 2014 13:43:01 +0100 | From | David Vrabel <> | Subject | Re: [Xen-devel] Xen PV domain regression with KASLR enabled (kernel 3.16) |
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On 08/08/14 12:20, Stefan Bader wrote: > Unfortunately I have not yet figured out why this happens, but can confirm by > compiling with or without CONFIG_RANDOMIZE_BASE being set that without KASLR all > is ok, but with it enabled there are issues (actually a dom0 does not even boot > as a follow up error). > > Details can be seen in [1] but basically this is always some portion of a > vmalloc allocation failing after hitting a freshly allocated PTE space not being > PTE_NONE (usually from a module load triggered by systemd-udevd). In the > non-dom0 case this repeats many times but ends in a guest that allows login. In > the dom0 case there is a more fatal error at some point causing a crash. > > I have not tried this for a normal PV guest but for dom0 it also does not help > to add "nokaslr" to the kernel command-line.
Maybe it's overlapping with regions of the virtual address space reserved for Xen? What the the VA that fails?
David
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