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=-1.0 required=3.0 tests=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 87CE9C433DF for ; Wed, 1 Jul 2020 08:19:56 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5078E2074D for ; Wed, 1 Jul 2020 08:19:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5078E2074D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BF6128D001B; Wed, 1 Jul 2020 04:19:55 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BA6638D0012; Wed, 1 Jul 2020 04:19:55 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AE3C78D001B; Wed, 1 Jul 2020 04:19:55 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0140.hostedemail.com [216.40.44.140]) by kanga.kvack.org (Postfix) with ESMTP id 98A768D0012 for ; Wed, 1 Jul 2020 04:19:55 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 5533C1EE6 for ; Wed, 1 Jul 2020 08:19:55 +0000 (UTC) X-FDA: 76988808750.23.pen62_1808c5926e7f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin23.hostedemail.com (Postfix) with ESMTP id 2CC7A37609 for ; Wed, 1 Jul 2020 08:19:55 +0000 (UTC) X-HE-Tag: pen62_1808c5926e7f X-Filterd-Recvd-Size: 3145 Received: from mail-ed1-f65.google.com (mail-ed1-f65.google.com [209.85.208.65]) by imf10.hostedemail.com (Postfix) with ESMTP for ; Wed, 1 Jul 2020 08:19:54 +0000 (UTC) Received: by mail-ed1-f65.google.com with SMTP id by13so8930960edb.11 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=cK66R1TekEpu5T0CRHoJl3YKn1Ifq8nl818JbkFbvnn1pNy/RMPIaHuctsv6Ztnqge Tic6ASezKFzsFoKFAu4pg9cM0iUaN79WqEaN6VDZ9+e0zD4TBu9e4W6jf7DNpHOLVUzG 3mJTYEifXqloMDpNidLa8NKx8fmeZJhr9kE9UObFlpYvyCghgpzL0Ss7MAv/50Aez3dS DyFoSrn7Da+58t9RKadOtRvralOfM6T7nAkpDM0bBKY9pjeWRlI3ANwXc7XXHyhSeRDA OT/5vkcbkhiCmanGf7JllJiK0/nbCJzhZse4YWCi3eC2+Vxy/Zbl6kzcn23h9BGqklKJ Lg6Q== X-Gm-Message-State: AOAM532ZOsEjbzrGC1IzvJ7Ru0H0qGCGSgx+PGgyGh8SHjvLn4W24Zlm tPpIZajqtpG4VImqUtMzZd4= 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: X-Rspamd-Queue-Id: 2CC7A37609 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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 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