[Bug 108799] [CI][BAT] igt at i915_selftest@live_sanitycheck - incomplete - BUG: unable to handle kernel (paging request|NULL pointer dereference) at

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108799

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit dafdf69736d66075836b7bc291584cd0889e7601 (HEAD -> topic/core-for-CI,
drm-intel/topic/core-for-CI)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri May 12 12:45:25 2017 +0100

    perf/core: Avoid removing shared pmu_context on unregister

    In commit 1fd7e4169954 ("perf/core: Remove perf_cpu_context::unique_pmu"),
    the search for another user of the pmu_cpu_context was removed, and so
    we unconditionally free it during perf_pmu_unregister. This leads to
    random corruption later and a BUG at mm/percpu.c:689.

    v2: Check for shared pmu_contexts under the mutex.

    Fixes: 1fd7e4169954 ("perf/core: Remove perf_cpu_context::unique_pmu")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: David Carrillo-Cisneros <davidcc at google.com>
    Cc: Peter Zijlstra (Intel) <peterz at infradead.org>
    Cc: Ingo Molnar <mingo at redhat.com>
    Cc: <stable at vger.kernel.org> # v4.11+
    Link:
http://patchwork.freedesktop.org/patch/msgid/20170512114525.17575-1-chris@chris-wilson.co.uk

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