[Bug 1352794] [NEW] Null pointer dereference in mmu_set_spte.isra

[Pierre Schweitzer]

Public bug reported:

Dear all,

We faced a kernel oops on KVM from a null pointer derefence on one of
our hypervisors (running several KVM VMs). This lead us to a serie of
kernel oops affecting all the VMs and finally, the host crash. We
couldn't really establish where from the first oops was comming (in
order to reproduce the crash).

You'll find attach the extract of syslog where you have the really first
oops, and all the followings.

We're using Ubuntu 12.04LTS. We're using latest releases available on
it, including for KVM. We're using kernel 3.8 due to hardware
constraints. And we're using kernel 3.8.0-33-generic due to regressions
in newer kernels (not yet reported).

** Affects: kvm (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Kernel oops"
   https://bugs.launchpad.net/bugs/1352794/+attachment/4170197/+files/syslog

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https://bugs.launchpad.net/bugs/1352794

Title:
  Null pointer dereference in mmu_set_spte.isra

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