From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Epler Subject: Re: 3.18 RT freezes on Raspberry Pi 2 Date: Thu, 5 Mar 2015 07:01:12 -0600 Message-ID: <20150305130111.GB668@unpythonic.net> References: <3671201425478878@web10j.yandex.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-rt-users@vger.kernel.org To: mikhail.avkhimenia@emlid.com Return-path: Received: from rrcs-76-79-27-186.west.biz.rr.com ([76.79.27.186]:50356 "EHLO rrcs-76-79-27-186.west.biz.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754607AbbCENai (ORCPT ); Thu, 5 Mar 2015 08:30:38 -0500 Content-Disposition: inline In-Reply-To: <3671201425478878@web10j.yandex.ru> Sender: linux-rt-users-owner@vger.kernel.org List-ID: It occurs to me that you could adjust the priority of IRQs (by sudo chrt). With cyclictest running at priority 49, adjust each irq down from 50 to 48 in turn and see if you get your hang. Once you have a specific irq, perhaps that will in turn point toward an actual cause. Jeff