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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,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 C9DB3C10F27 for ; Mon, 9 Mar 2020 09:24:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9B6CC20828 for ; Mon, 9 Mar 2020 09:24:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="XhADhYlm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726514AbgCIJY1 (ORCPT ); Mon, 9 Mar 2020 05:24:27 -0400 Received: from mail-lj1-f195.google.com ([209.85.208.195]:33089 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725956AbgCIJY1 (ORCPT ); Mon, 9 Mar 2020 05:24:27 -0400 Received: by mail-lj1-f195.google.com with SMTP id f13so9135948ljp.0 for ; Mon, 09 Mar 2020 02:24:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=YQ8ihxTiV/jjqWVrSKRrrI0iYYsvH3N8HGqyTw+Ycoo=; b=XhADhYlmynisFq92OzBfjdzZBO1qZW/KeHGDyUWlY2oH5uNbf72oBV0Gs3LNR2sAVG l0z42Y2GXAdOWKhvwAMNEKiTPdgGzluQLnp/vHaj9ZGqUP0E2KhFlGn+No+MXizHRmiy 6DRznZKEo3ZSIQhv+bhpzfVcuJNd/IrfihsBLgHg2hrQ52G2glIjAWSwGgczU3L6AUnQ u+N3LtlsG3R67i+DjaC47I6m06YGZdlQhpTbbLlLPcWZ2NqYdGKOFpbPXoFUzLi9MT7U dlo84YXkjmcRI4OhHuofBD1nuaAt+D9Zht/0lpexO+xQ/iFnkHuQ1DAbbrjduFKHb00A /OYw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=YQ8ihxTiV/jjqWVrSKRrrI0iYYsvH3N8HGqyTw+Ycoo=; b=RZcpO4veNiewayxU9dwIj9FgA495PBJlhMwdPxdBOtVGOvf1xri5GWqAy9w/6YlEqA WjGnCwxwaCBhC0T6RFQf3JTBxtH+pQb3gG8HlM0vuvilGGwlubSji87Ivd51ryrHxQpH rLh/ynqdvTWWdH0iyu/BKiPm5VGOuYzJ1daeYpubMKS+s3YN0G14NfwI8xCccKoaO49D qabTAcZiR5k93EekaFp3f4ZAOu9tqkA4fUXZI707W/dAMhZKbEgXJvnXW7Li0HzrMyYd IF/xFxgRTx00IangBLvOFREU5pweO+xNulXG2lr2t1I91UE9Z14NEWENyqKkAoh4he8P R8kg== X-Gm-Message-State: ANhLgQ3CQP6QYrv38DfvpXLJrKlmDASSdnBIc5lWgwX+2aiI+IdUeysI 8UCHWYBnlDhQ1v+vGSstltmXEg== X-Google-Smtp-Source: ADFU+vvxLcx07yy2z4SiJN1Y1h8zgf7mZMks/EH/eMARLBfm6P38Bhh2wv6ZOqosSgOadfUL30Qq9g== X-Received: by 2002:a2e:5304:: with SMTP id h4mr9009259ljb.75.1583745865154; Mon, 09 Mar 2020 02:24:25 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id b17sm21888957ljd.5.2020.03.09.02.24.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2020 02:24:24 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id D3A3D10258B; Mon, 9 Mar 2020 12:24:23 +0300 (+03) Date: Mon, 9 Mar 2020 12:24:23 +0300 From: "Kirill A. Shutemov" To: syzbot , Alex Shi Cc: akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com Subject: Re: linux-next test error: BUG: using __this_cpu_read() in preemptible code in __mod_memcg_state Message-ID: <20200309092423.2ww3aw6yfyce7yty@box> References: <00000000000022640205a04a20d8@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000022640205a04a20d8@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 07, 2020 at 01:05:10PM -0800, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: b86a6a24 Add linux-next specific files for 20200306 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1766b731e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9c79dccc623ccc6f > dashboard link: https://syzkaller.appspot.com/bug?extid=826543256ed3b8c37f62 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+826543256ed3b8c37f62@syzkaller.appspotmail.com > > check_preemption_disabled: 3 callbacks suppressed > BUG: using __this_cpu_read() in preemptible [00000000] code: syz-fuzzer/9432 > caller is __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689 > CPU: 1 PID: 9432 Comm: syz-fuzzer Not tainted 5.6.0-rc4-next-20200306-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x188/0x20d lib/dump_stack.c:118 > check_preemption_disabled lib/smp_processor_id.c:47 [inline] > __this_cpu_preempt_check.cold+0x84/0x90 lib/smp_processor_id.c:64 > __mod_memcg_state+0x27/0x1a0 mm/memcontrol.c:689 > __split_huge_page mm/huge_memory.c:2575 [inline] > split_huge_page_to_list+0x124b/0x3380 mm/huge_memory.c:2862 > split_huge_page include/linux/huge_mm.h:167 [inline] It looks like a regression due to c8cba0cc2a80 ("mm/thp: narrow lru locking"). Alex? > madvise_free_huge_pmd+0x873/0xb90 mm/huge_memory.c:1766 > madvise_free_pte_range+0x6ff/0x2650 mm/madvise.c:584 > walk_pmd_range mm/pagewalk.c:89 [inline] > walk_pud_range mm/pagewalk.c:160 [inline] > walk_p4d_range mm/pagewalk.c:193 [inline] > walk_pgd_range mm/pagewalk.c:229 [inline] > __walk_page_range+0xcfb/0x2070 mm/pagewalk.c:331 > walk_page_range+0x1bd/0x3a0 mm/pagewalk.c:427 > madvise_free_single_vma+0x384/0x550 mm/madvise.c:731 > madvise_dontneed_free mm/madvise.c:819 [inline] > madvise_vma mm/madvise.c:958 [inline] > do_madvise mm/madvise.c:1161 [inline] > do_madvise+0x5ba/0x1b80 mm/madvise.c:1084 > __do_sys_madvise mm/madvise.c:1189 [inline] > __se_sys_madvise mm/madvise.c:1187 [inline] > __x64_sys_madvise+0xae/0x120 mm/madvise.c:1187 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x460bf7 -- Kirill A. Shutemov