Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754032AbdHWM5g (ORCPT ); Wed, 23 Aug 2017 08:57:36 -0400 Received: from mx2.suse.de ([195.135.220.15]:51072 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753915AbdHWM5f (ORCPT ); Wed, 23 Aug 2017 08:57:35 -0400 Date: Wed, 23 Aug 2017 14:57:33 +0200 From: Michal Hocko To: Feng Feng24 Liu Cc: "linux-kernel@vger.kernel.org" , "linux-rt-users@vger.kernel.org" , "kirill.shutemov@linux.intel.com" , "gregkh@linuxfoundation.org" , "rostedt@goodmis.org" , Tong Tong3 Li Subject: Re: All process has been hanged after a kernel WARNING in kernel 4.4.x Message-ID: <20170823125732.GC2647@dhcp22.suse.cz> References: <2B18E8E1DDAE074A82D1060396451DAE26407871@CNMAILEX03.lenovo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2B18E8E1DDAE074A82D1060396451DAE26407871@CNMAILEX03.lenovo.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 870 Lines: 23 On Wed 23-08-17 12:40:36, Feng Feng24 Liu wrote: > Dear experts > I install kernel 4.4.70-rt83 in my environment, and run QEMU-KVM & OVS-DPDK on my server. Is this reproducible? If yes could you try without RT patches applied to know this is applicable to vanilla kernel as well? > After a kernel warning, I found that all of the process, such as sshd, has no response. The monitor cannot displayed. All process looks like has been hanged. But the server could be ping. The warning tells that we have underflown the counter and that can have variety of side effects. [...] > I find there is a discuss at: > https://lkml.org/lkml/2015/12/3/460 from a quick glance this doesn't seem related. > Whether it is the same problem as above? Is it a known issue , which has not been fixed in kernel 4.4.x? I haven't seen any such reports. -- Michal Hocko SUSE Labs