From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hubert Chaumette <hubert.chaumette-39ZsbGIQGT5GWvitb5QawA@public.gmane.org>
Subject: =?UTF-8?Q?re:_SYNC_-_takes_VERY_=C2=A0long_?=
 =?UTF-8?Q?complete_=C2=A0(_system_freezes)_!?=
Date: Wed, 19 Apr 2017 13:12:40 +0200 (CEST)
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To: Vellemans Noel <Noel.Vellemans-jVIO7HaJqZIeKeHsXy56Pg@public.gmane.org>, "kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>

> Any clue what could be the cause, or any hints that could explain ( and solve ?) this ..

Assuming the regression is 100% reproducible, your best bet is IMO to do a (git) bisect between the two kernels versions.
Regards,

Hubert Chaumette