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    SubjectRe: Linux 2.6.39 -- *ERROR* Attempting to mmap a purgeable buffer
    On Thu, May 19, 2011 at 8:26 AM, Mark Lord <kernel@teksavvy.com> wrote:
    >
    > Just got weird stuff in the syslog this morning from rc7-git12:
    >
    > [43190.824700] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.827426] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.827506] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.827568] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.828685] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.830498] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.830603] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.831055] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.832580] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer
    > [43190.832788] [drm:i915_gem_mmap_gtt] *ERROR* Attempting to mmap a purgeable buffer

    Quoting from an earlier mail about this issue from the DRM people:

    "Userspace is attempting to write to/read from a buffer it has
    marked as being no longer required, so some rendering is going amiss.
    And it does not rule out the possibility that at some point it will
    catch the error later and result in a SIGBUS being sent to the
    application (probably X).

    However since it is not a kernel error nor is it fatal, that and a
    lot of similar messages can be demoted to debug."

    So it's basically user space trying to access something stale, but it
    should be harmless.

    Linus


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