From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de ([195.135.220.15]:56651 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756086AbdABRQW (ORCPT ); Mon, 2 Jan 2017 12:16:22 -0500 Date: Mon, 2 Jan 2017 18:16:17 +0100 From: Jan Kara To: Xiong Zhou Cc: jack@suse.cz, linux-nvdimm@ml01.01.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: LTP rwtest01 blocks on DAX mountpoint Message-ID: <20170102171617.GA23612@quack2.suse.cz> References: <20161224110714.mp2mevzwkhlxm7zw@xzhoul.usersys.redhat.com> <20161230093352.efidonh4btdbtaze@XZHOUW.usersys.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161230093352.efidonh4btdbtaze@XZHOUW.usersys.redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Fri 30-12-16 17:33:53, Xiong Zhou wrote: > On Sat, Dec 24, 2016 at 07:07:14PM +0800, Xiong Zhou wrote: > > Hi lists, > > > > Since around 20161129 tag, LTP rwtest01 on dax mountpoint blocks > > on linux-next tree, now on Linus tree. > > > > In "normal", rwtest01 subcase ends in a few minutes, now it keeps > > running for hours on dax mountpoint, both ext4 and xfs. Ctrl + c > > can interrupt it. > > Test programme is waiting for a memcpy call to return. > > From sysrq output, kernel code is not blocking on somewhere, > it just wont return. I was trying to reproduce this but for me rwtest01 completes just fine on dax mountpoint (I've used your reproducer). So can you sample several kernel stack traces to get a rough idea where the kernel is running? Thanks! Honza -- Jan Kara SUSE Labs, CR