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 99ABBC433E1 for ; Wed, 1 Jul 2020 08:19:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7146D20722 for ; Wed, 1 Jul 2020 08:19:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593591597; bh=gloUNhUzU4f+X/ESg4esOSkH91gL58eQGdW1/JLfGw8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=jS9I/iFuG5POWt0KUGhwPzS4lnOoSnUIFUpJew/76s1fOgAe3ljHptVy07j9RJSeZ JjDRPv4tlM66xno4fAdS9bBL9k3lGAfl6MI/p7zZQ3/76DCcv5BTPGnyYdGXH4eZeJ PUfjS+VVtyhLMDl0lCi020WUkFmus/vFWW9eH9tI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728633AbgGAITz (ORCPT ); Wed, 1 Jul 2020 04:19:55 -0400 Received: from mail-ed1-f68.google.com ([209.85.208.68]:35695 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728575AbgGAITz (ORCPT ); Wed, 1 Jul 2020 04:19:55 -0400 Received: by mail-ed1-f68.google.com with SMTP id e15so18828503edr.2 for ; Wed, 01 Jul 2020 01:19:54 -0700 (PDT) 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=thbUP8KbOogeqAEdzq644Nq9+Yx56Jb6fhYA6UnFTDs=; b=DcJq6UDwAkFZXyDd4sxK3n1EazehLvdrmD1MaeL0POhAOkv/1Urj0qvYNur1hdWcgE nrWDkiteol9LkLu3KUPypJopsGOSbDYLTjG4OgIrlgaY59sqA/lPzDJR950YvbxD1xOr qj/XOmXhFnl//0Oxauztw5E72VQfpM3vW3nuzZ9W32IHUt4GompMjHgvw8bxM3ZUGho0 jeX0mhWWihOTnlSRBotBXTLk0sL0322Yl7Onc4DB6zDpsXTgomSWqpzDxYB/hBG/WDsD ZWsLkvq8Y9cx/5/e3gbJqKq01MJ5+5sHwItpEeUbeHxoB2OxWO8XsdkJArKTXY3m5FQh OKLQ== X-Gm-Message-State: AOAM533GbZJQ6TCgkpQMEwUnoMWpMcJDDr+zo9K4GZNrbE7mmiHEuOJA 5Vsxvq+rsd2wjESvrjoswIjoj34A X-Google-Smtp-Source: ABdhPJwur1+7K8jfjciMaTh1Q1nX6ZIJsSyfVDTVFKntMDoCtbOJ+EapOxRLydxpvqxlKyEk9DQ/hA== X-Received: by 2002:aa7:c714:: with SMTP id i20mr28057806edq.215.1593591593695; Wed, 01 Jul 2020 01:19:53 -0700 (PDT) Received: from localhost (ip-37-188-168-3.eurotel.cz. [37.188.168.3]) by smtp.gmail.com with ESMTPSA id c15sm2061538edm.47.2020.07.01.01.19.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jul 2020 01:19:52 -0700 (PDT) Date: Wed, 1 Jul 2020 10:19:51 +0200 From: Michal Hocko To: Naresh Kamboju Cc: Christoph Lameter , Roman Gushchin , Johannes Weiner , Shakeel Butt , linux-mm , Vlastimil Babka , Kernel Team , open list , Yafang Shao , lkft-triage@lists.linaro.org, Andrew Morton Subject: Re: PANIC: mm: memcg/slab: percpu_ref_put_many - Unable to handle kernel paging request at virtual address ffff80096d78f000 Message-ID: <20200701081951.GL2369@dhcp22.suse.cz> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Thanks -- Michal Hocko SUSE Labs