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=-10.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 1E421C433E1 for ; Fri, 17 Jul 2020 08:07:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F3D4020737 for ; Fri, 17 Jul 2020 08:07:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727946AbgGQIHv (ORCPT ); Fri, 17 Jul 2020 04:07:51 -0400 Received: from mga02.intel.com ([134.134.136.20]:43096 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726113AbgGQIHv (ORCPT ); Fri, 17 Jul 2020 04:07:51 -0400 IronPort-SDR: lY88EXfJinOBNj/YVxtEA9Qj4YNXCJ4W+tNto1uaiMalH4v8bf/rcupsfecH/7uAQ3iUeDNeP5 ZJlZS4qf+WYw== X-IronPort-AV: E=McAfee;i="6000,8403,9684"; a="137670258" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="137670258" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 01:07:50 -0700 IronPort-SDR: nwd7jPJHwVPkxZaosK2NPWshU/1YIuZs/EX9Bl/nY2WbjNHt1AGhV6tHybdW217GnnQHy9ljc7 Gxhm11TQxhmw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="430773818" Received: from shao2-debian.sh.intel.com (HELO [10.239.13.3]) ([10.239.13.3]) by orsmga004.jf.intel.com with ESMTP; 17 Jul 2020 01:07:48 -0700 Subject: Re: [LKP] Re: db57e98d87 ("mm/sparse.c: fix ALIGN() without power of 2 in .."): BUG: kernel reboot-without-warning in early-boot stage, last printk: early console in setup code To: Andrew Morton , kernel test robot Cc: Lecopzer Chen , Mark-PK Tsai , Linux Memory Management List , linux-kernel@vger.kernel.org, LKP References: <20200716083159.GH3874@shao2-debian> <20200716150613.409103a2d1e4c3f5f63652b8@linux-foundation.org> From: Rong Chen Message-ID: <699f0838-14d9-9a3b-4265-c05d4793a1c3@intel.com> Date: Fri, 17 Jul 2020 16:07:20 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20200716150613.409103a2d1e4c3f5f63652b8@linux-foundation.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/17/20 6:06 AM, Andrew Morton wrote: > On Thu, 16 Jul 2020 16:32:00 +0800 kernel test robot wrote: > >> Greetings, >> >> 0day kernel testing robot got the below dmesg and the first bad commit is >> >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master >> >> commit db57e98d87908b8837352abe08515e42752270c1 >> Author: Lecopzer Chen >> AuthorDate: Mon Sep 23 15:36:24 2019 -0700 >> Commit: Linus Torvalds >> CommitDate: Tue Sep 24 15:54:09 2019 -0700 >> >> mm/sparse.c: fix ALIGN() without power of 2 in sparse_buffer_alloc() > Are we sure about this? That patch is a year old - has something > in the test setup changed to make it visible at this late stage? Hi Andrew, The issue can be reproduced if CONFIG_SPARSEMEM_VMEMMAP is not set $ grep CONFIG_SPARSEMEM .config CONFIG_SPARSEMEM_MANUAL=y CONFIG_SPARSEMEM=y CONFIG_SPARSEMEM_EXTREME=y CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y # CONFIG_SPARSEMEM_VMEMMAP is not set $ ./reproduce-yocto-vm-yocto-23:20200619042212:x86_64-randconfig-r025-20200618:5.3.0-11836-gdb57e98d87908:1 vmlinuz-5.3.0-11836-gdb57e98d87908 early console in setup code and kernel can boot if enable CONFIG_SPARSEMEM_VMEMMAP $ grep CONFIG_SPARSEMEM .config CONFIG_SPARSEMEM_MANUAL=y CONFIG_SPARSEMEM=y CONFIG_SPARSEMEM_EXTREME=y CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y CONFIG_SPARSEMEM_VMEMMAP=y $ ./reproduce-yocto-vm-yocto-23:20200619042212:x86_64-randconfig-r025-20200618:5.3.0-11836-gdb57e98d87908:1 vmlinuz-5.3.0-11836-gdb57e98d87908.CONFIG_SPARSEMEM_VMEMMAP | head early console in setup code [    0.000000] Linux version 5.3.0-11836-gdb57e98d87908 (kbuild@6c2adaf8a115) (clang version 12.0.0 (git://gitmirror/llvm_project ed6b578040a85977026c93bf4188f996148f3218)) #1 SMP Fri Jul 17 15:41:47 CST 2020 [    0.000000] Command line: root=/dev/ram0 hung_task_panic=1 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 watchdog_thresh=60 [    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]: 256 [    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. [    0.000000] BIOS-provided physical RAM map: [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable qemu-system-x86_64: terminating on signal 2 Best Regards, Rong Chen