[Nouveau] [Bug 58087] New: [-next] nouveau corrupts kernel mm allocator

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58087

          Priority: medium
            Bug ID: 58087
          Assignee: nouveau at lists.freedesktop.org
           Summary: [-next] nouveau corrupts kernel mm allocator
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: peter at hurleysoftware.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 71269
  --> https://bugs.freedesktop.org/attachment.cgi?id=71269&action=edit
kernel log showing BUG triggered by nouveau

If nouveau_vm_new() fails in nouveau_drm_open(), the cleanup triggered corrupts
the kernel slab allocator (in this case, SLUB).

Attached is the kernel log showing the page allocation failure and the
subsequent BUG in mm/slub.c

A similar corruption had previously occurred which triggered a GP fault in the
mm allocator from the same code path. This was reported as kernel bug #51291
here
https://bugzilla.kernel.org/show_bug.cgi?id=51291

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