On Wed, Mar 16, 2016 at 05:38:05PM -0700, Owen Hofmann wrote:
> Hi, this is a request to please include upstream commit
> 00df35f991914db6b8bde8cf09808e19a9cffc3d ("cpu: Defer smpboot kthread
> unparking until CPU known to scheduler") in stable trees >= 3.15 and <
> 4.1.
>
> Upstream dd9d3843755da95f63dd3a376f62b3e45c011210 ("sched: Fix
> cpu_active_mask/cpu_online_mask race") was included in stable to fix a
> race condition that led to kthreads running on the wrong cpu and
> causing errors like "kernel BUG at kernel/smpboot.c:135!". This is
> especially likely when running as a virtualized guest.
>
> However, the fix depends on the ordering introduced in the requested
> patch, so the issue remains in kernels between 3.15 when the bug was
> introduced, and 4.1 which has 00df35f9.
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Thanks Owen, I'll queue this for the 3.16 kernel.
Cheers,
--
Luís
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