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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 DE854C433E0 for ; Thu, 2 Jul 2020 15:58:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB9C1207D4 for ; Thu, 2 Jul 2020 15:58:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="uaN2/f9u" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726362AbgGBP6T (ORCPT ); Thu, 2 Jul 2020 11:58:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725379AbgGBP6S (ORCPT ); Thu, 2 Jul 2020 11:58:18 -0400 Received: from mail-lf1-x141.google.com (mail-lf1-x141.google.com [IPv6:2a00:1450:4864:20::141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4288AC08C5C1 for ; Thu, 2 Jul 2020 08:58:18 -0700 (PDT) Received: by mail-lf1-x141.google.com with SMTP id m26so16529944lfo.13 for ; Thu, 02 Jul 2020 08:58:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=X1RTSp5CrRapQnypmSWSxe/qopyJZ+immsPrPXeTLek=; b=uaN2/f9uUUo5KuYlYHl1tl6tsXQDBysYqwwMd4Z9/ExaKKI7wGKeANxWlxbwKw5FR3 E9RqrzIQwGWMIkWZXq+wQ3h54Xk41S+ikq3JT6/jhx204AmO6EutELdpxZ05SEnVzWTa cvUcmMAyQ0RHzpyBVCkyd0GwbGiym+be7CwCY+pXJ1T/vqHrJK/HTm3j+GmV2p8qQcXA CFc0rdWvqKMFvNV68ETdp1vQ7BvZhenuNYuP46oOK5dTOHtBBBOeJTsAh0yQQUh3wuZ0 qQ+ZWZPmu7gtAFLVWzcQrOCFUzZLiqo0OWPw5nSnshjAFxcJcYELgzykcRy4sh5tCdrF Nt7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=X1RTSp5CrRapQnypmSWSxe/qopyJZ+immsPrPXeTLek=; b=NrfxcH9RyXfYrovZFU8/Ezfh2cNNfBA1Qz8JB2aSS8wWoOrmo0qhZzeH6AJvxUVaZ3 61z3O1Ggv8xe1TceyalQk8AVbi9iHsmR7Yn6vdPcNFHZuwqMJYgcIS2MS8G8C+ggcBvi RbpXM/ZAMKR9X50NkbqSx2ldqBfHaHqEQSS411QXJhgDHs1xIUd0qAafo3nG5oI+qVPf 4VzSaJCksaRFMq+UVSLgqgO74ZvI4Kx3U5/XNAZuTssowY40KlBf4DLyI2CIRia/V6s0 eR+sIN0T9YP7INr2nCB9mk6uYj04vJrcpz0zs7E7zmKzGhhSsBfjci++pcCxYsFquFvO lz6Q== X-Gm-Message-State: AOAM530mrEkhWgX82/awoa7eVB7TmWUwOtqQpyMAR06hpVE1qff7Ivuk 4GZYbfig4Y2F5joQ6lpxB+eDjbHn1KGX+QnGDz9P2A== X-Google-Smtp-Source: ABdhPJxW9QCybVBEiIBzLHYaoVi83qJhwdUiujZa1suq4MYmE6SR6DDHtMcqZ7sV8yDrxcI39R9rkQED5X1gELJzwEc= X-Received: by 2002:a19:4285:: with SMTP id p127mr17850250lfa.74.1593705496697; Thu, 02 Jul 2020 08:58:16 -0700 (PDT) MIME-Version: 1.0 References: <20200701081951.GL2369@dhcp22.suse.cz> In-Reply-To: <20200701081951.GL2369@dhcp22.suse.cz> From: Naresh Kamboju Date: Thu, 2 Jul 2020 21:28:05 +0530 Message-ID: Subject: Re: PANIC: mm: memcg/slab: percpu_ref_put_many - Unable to handle kernel paging request at virtual address ffff80096d78f000 To: Roman Gushchin , Michal Hocko Cc: Christoph Lameter , Johannes Weiner , Shakeel Butt , linux-mm , Vlastimil Babka , Kernel Team , open list , Yafang Shao , lkft-triage@lists.linaro.org, Andrew Morton Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 1 Jul 2020 at 13:49, Michal Hocko wrote: > > On Wed 01-07-20 13:24:54, Naresh Kamboju wrote: > > While running LTP mm test suite on arm64 Juno device the kernel panic > > noticed on linux-next 20200630 tag. > > Can you try to bisect? The new memcg slab allocator series sounds like a > potential candidate. One of the patches has changed the memcg reference > counting which is showing up on the stack. This might be a side effect > of something else of course but bisection would tell us more. The reported problem is fixed by a patch proposed in this email thread. https://lore.kernel.org/linux-mm/20200701184552.GA61684@carbon.DHCP.thefacebook.com/ - Naresh > > Thanks > > -- > Michal Hocko > SUSE Labs 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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 D1AEDC433DF for ; Thu, 2 Jul 2020 15:58:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 98E1D207D4 for ; Thu, 2 Jul 2020 15:58:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="uaN2/f9u" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98E1D207D4 Authentication-Results: mail.kernel.org; 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charset="UTF-8" X-Rspamd-Queue-Id: 717821814B0D6 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 1 Jul 2020 at 13:49, Michal Hocko wrote: > > On Wed 01-07-20 13:24:54, Naresh Kamboju wrote: > > While running LTP mm test suite on arm64 Juno device the kernel panic > > noticed on linux-next 20200630 tag. > > Can you try to bisect? The new memcg slab allocator series sounds like a > potential candidate. One of the patches has changed the memcg reference > counting which is showing up on the stack. This might be a side effect > of something else of course but bisection would tell us more. The reported problem is fixed by a patch proposed in this email thread. https://lore.kernel.org/linux-mm/20200701184552.GA61684@carbon.DHCP.thefacebook.com/ - Naresh > > Thanks > > -- > Michal Hocko > SUSE Labs