Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966525AbcLVVKV (ORCPT ); Thu, 22 Dec 2016 16:10:21 -0500 Received: from mail-io0-f193.google.com ([209.85.223.193]:35415 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756545AbcLVVKU (ORCPT ); Thu, 22 Dec 2016 16:10:20 -0500 MIME-Version: 1.0 In-Reply-To: <20161222210607.GK4758@dastard> References: <20161214222411.GH4326@dastard> <20161214222953.GI4326@dastard> <20161216185906.t2wmrr6wqjdsrduw@straylight.hirudinean.org> <20161221221638.GD4758@dastard> <20161222001303.nvrtm22szn3hgxar@straylight.hirudinean.org> <20161222051322.GF4758@dastard> <20161222062858.GG4758@dastard> <20161222204240.GJ4758@dastard> <20161222210607.GK4758@dastard> From: Linus Torvalds Date: Thu, 22 Dec 2016 13:10:19 -0800 X-Google-Sender-Auth: u9rftOgSnyQ-lqcOMA3tA1SOQ40 Message-ID: Subject: Re: [4.10, panic, regression] iscsi: null pointer deref at iscsi_tcp_segment_done+0x20d/0x2e0 To: Dave Chinner , Jens Axboe Cc: Thomas Gleixner , Ingo Molnar , Peter Anvin , Linux Kernel Mailing List , "the arch/x86 maintainers" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 607 Lines: 15 Ok, so the numa issue was a red herring. With that fixed: On Thu, Dec 22, 2016 at 1:06 PM, Dave Chinner wrote: > > Better, but still bad. average files/s is not up to 200k files/s, > so still a good 10-15% off where it should be. xfs_repair is back > down to 10-15% off where it should be, too. bulkstat still fires off > a bad page reference count warning, iscsi still panics immediately. Do you have CONFIG_BLK_WBT enabled, perhaps? It's new to this merge window, and I'm not convinced it's been tuned. Particularly for your kinds of fairly extreme IO loads. Linus