ACK: [SRU][Xenial][PATCH 0/2] Fixes for LP #1687512

[Colin Ian King]

On 04/05/17 01:02, Daniel Axtens wrote:
> BugLink: https://bugs.launchpad.net/bugs/1687512
> 
> [Impact]
> Apache Mesos and Kubernetes workloads on Xenial cause a panic
> (NULL pointer dereference) in the completely fair scheduler.
> 
> These panics are in pick_next_entity and include pick_next_task_fair
> in the call stack.
> 
> [Fix]
> Cherry-picking both
> 754bd598be9bbc953bc709a9e8ed7f3188bfb9d7
> (http://lkml.kernel.org/r/146608183552.21905.15924473394414832071.stgit@buzz)
> and
> 094f469172e00d6ab0a3130b0e01c83b3cf3a98d
> (http://lkml.kernel.org/r/146608182119.21870.8439834428248129633.stgit@buzz)
> fix the crash.
> They appear to be intended as a series - they were posted to LKML at
> the same time.
> 
> [Testcase]
> The fix has been validated by the user who reported the bug
> 
> [Notes]
> These commits went upstream in 4.7-rc5, so they are already in
> Yakkety/Zesty/Artful.
> 
> Konstantin Khlebnikov (2):
>   sched/fair: Do not announce throttled next buddy in
>     dequeue_task_fair()
>   sched/fair: Initialize throttle_count for new task-groups lazily
> 
>  kernel/sched/fair.c  | 29 ++++++++++++++++++++++++-----
>  kernel/sched/sched.h |  2 +-
>  2 files changed, 25 insertions(+), 6 deletions(-)
> 

Clean up stream cherry picks that seem to fix the null ptr dereference
issue.

Acked-by: Colin Ian King <colin.king at canonical.com>