From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE675C11D05 for ; Thu, 20 Feb 2020 14:05:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCF2C208E4 for ; Thu, 20 Feb 2020 14:05:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582207553; bh=n56mt7L8N0XSy9L5ZmBsA7GK24hIPPF6hAKz9d6mXEk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=nyTonAnqjosm/H1iK+eXKVHdbWfc44FcOPdGHTvyVM6VBx987U22nGLieEJ4i4Rb0 W5DNFLO66RI9C1fyZBqtl+NuZ/czADtGamhXWThDtxpu3ApdO7QouHJTugu0QFPFKe uvfsauL5CBC8HtVJ5D+bw77yD1kqtbyLCBJEI3R8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728042AbgBTOFx (ORCPT ); Thu, 20 Feb 2020 09:05:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:40894 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727943AbgBTOFx (ORCPT ); Thu, 20 Feb 2020 09:05:53 -0500 Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 054BF20656; Thu, 20 Feb 2020 14:05:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582207552; bh=n56mt7L8N0XSy9L5ZmBsA7GK24hIPPF6hAKz9d6mXEk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=PA/9l44fSJwZiC4j4lrNeWjs6xVSflTL3myx4ruxasOG4wtZX6KMok4BxUPhrOZFW 8gPFYHF+AEVA5nWR6EHDbWYclo64lKCzk4O1mlOP7QRKJuF5akhCOpe2JEHDRGyxFK 6jTOQzuePQuRZjABiAsWogiahReRRcbRNY+xNrcA= Date: Thu, 20 Feb 2020 16:05:47 +0200 From: Leon Romanovsky To: Chuck Lever Cc: Wang Yugui , linux-rdma Subject: Re: a bug(BUG: kernel NULL pointer dereference) of ib or mlx happened in 5.4.21 but not in 5.4.20 Message-ID: <20200220140547.GE209126@unreal> References: <20200220112231.34FB.409509F4@e16-tech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Thu, Feb 20, 2020 at 08:57:29AM -0500, Chuck Lever wrote: > Hello! > > Thanks for your bug report. > > > > On Feb 19, 2020, at 10:22 PM, Wang Yugui wrote: > > > > Hi, chuck.lever > > > > a bug(BUG: kernel NULL pointer dereference) of ib or mlx happened in 5.4.21 but not in 5.4.20. > > > > maybe some releationship to xprtrdma-fix-dma-scatter-gather-list-mapping-imbalance.patch > > I don't see an obvious connection to fix-dma-scatter-gather-list-mapping-imbalance. > The backtrace below is through IPoIB code paths. Those have nothing to do with > NFS/RDMA, which is the only ULP code that is changed by my commit. > > > > maybe the info is useful. > > I'm copying linux-rdma for a bigger set of eyeballs. > > My knee-jerk recommendation is that if you have a reliable reproducer, try "git bisect" > between .20 and .21 to nail down a specific commit where the BUG starts to occur. No need to bisect, it is me who broke. The fix is already accepted, but not yet merged. https://patchwork.kernel.org/patch/11387567/ Thanks