The bug can crash the kernel, which can be reproduced by the test program
in the changelog.
The fix can be applied to kernels >= 2.6.38 && <= 3.4.
commit 9c5da09d266ca9b32eb16cf940f8161d949c2fe5
Author: Salman Qazi <sqazi@xxxxxxxxxx>
Date: Thu Jun 14 15:31:09 2012 -0700
perf: Use css_tryget() to avoid propping up css refcount
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