Hello Sponsors,

Attached you can find a debdiff for the artful series which fixes the issue 
on this bug for powerpc architecture. 

The patch cover multiple commits from upstream MariaDB,

* Commit 6ea41f1e84eb6b864cac17ad0b862bde9820dc33: Implements
the os_fast_mutex(unlock_full_barrier/trylock_full_barrier) which
implies a full memory barrier.

It also implements the os_mb OS memory barrier primitives for the
different architectures which is guaranteed to act as 
full acquire-release barrier.

* Commit 5ad02062d928cccbd29c0a2db6f0f7ceb33195d1: Based on the
previous commit, it  adds a memory barrier on the mutex_exit
to prevent reading the number of waiters before releasing the lock,
this is completed with a modification on mutex_set_waiters that adds
a os_mb to make sure waiters store won't pass over mutex_test_and_set.

* Commit 40497577ffd9f85557b15e08ad913f627b2e9530: The ib mutex set_and_test
function and acquires the lock by calling the 
method which should be safe in PowerPC, at the same time the mutex unlock method
will call the os_atomic_test_and_set_byte_release which is implemented as a 
__sync_lock_release + a __sync_synchronize call in PowerPC. 

I've already performed the verification marked on this bug, with the following 

** Patch added: "lp1657256-artful.debdiff"

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  Percona crashes when doing a a 'larger' update

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