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=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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 CD860C11F69 for ; Thu, 1 Jul 2021 12:43:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E86261406 for ; Thu, 1 Jul 2021 12:43:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236466AbhGAMp4 (ORCPT ); Thu, 1 Jul 2021 08:45:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236282AbhGAMpy (ORCPT ); Thu, 1 Jul 2021 08:45:54 -0400 Received: from mail-wm1-x32e.google.com (mail-wm1-x32e.google.com [IPv6:2a00:1450:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48452C0617AD for ; Thu, 1 Jul 2021 05:43:24 -0700 (PDT) Received: by mail-wm1-x32e.google.com with SMTP id j11-20020a05600c1c0bb02901e23d4c0977so6809975wms.0 for ; Thu, 01 Jul 2021 05:43:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=google; h=message-id:subject:from:to:cc:date:in-reply-to:references :user-agent:mime-version:content-transfer-encoding; bh=mo6oA/XnbDUGfk8NTnLtsX2Oxt2DjcL5ZEyjcIbXJxE=; b=ZoT209PloXnbOEhL1QU7auZZ8wiKaoDhkCY5o/ymMMMc54wtJgZRSBBst/6uWhboWC HJUkHBzw6bANDxSgtGj3yL1oQE4Q6Lxw9ITAw68rg6FgsGIcy5ANlDp5PbqojKIES3/e ZlmYBBAluT51L1CqtjRWPvBnwPN/vR35iWVlA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:user-agent:mime-version:content-transfer-encoding; bh=mo6oA/XnbDUGfk8NTnLtsX2Oxt2DjcL5ZEyjcIbXJxE=; b=e4Ml8ud/DGg9fPC+5VhzmuFnNuirKEN/vBKNBgcmKtik207U711aUxmZvgQrIFqdBn wi1ZOj+PHrzz7/sqYh/S3a+hLlGwDnxOztHtUbMT7Q/6vlI6OaTSMlqKvlIKWmNYCLA/ 1Y+LgfOTEDgxf9pQ/IldL99BpDWMVE3t/Jcx1sA/Fj8SwX9tAj871oRL9Af+1G+71Nsd lituwonvExvQa3QdUG+Cu8okMSJDl+2mbIkMkVaLf+7XukjpXnHy1mgQbfr9mmNcRfDn 89OjmBdeZWaW1L2ckAKw76WP8X1vd7JJrLqOHlHy9NqUfYC7fbpLn+hChb5VoZQcNwE9 QhWg== X-Gm-Message-State: AOAM530HFmh2tQ/NLapdfq2e63tgiXjQGdQ1A5uQYFP1EdN//0CzwQAt OtGV61VoUA/A+HekULqQcrXI4KwvNy1Fdg== X-Google-Smtp-Source: ABdhPJzTAwPPPR6L6P6uS3+LRZi3ZK1wPBHWPVvFvkqIsj03BGz5+yt7Zwi0kIGdB+vlNRETEs5OjQ== X-Received: by 2002:a1c:7314:: with SMTP id d20mr42940651wmb.167.1625143402298; Thu, 01 Jul 2021 05:43:22 -0700 (PDT) Received: from ?IPv6:2001:8b0:aba:5f3c:a683:959f:4ccb:54d6? ([2001:8b0:aba:5f3c:a683:959f:4ccb:54d6]) by smtp.gmail.com with ESMTPSA id f6sm8278917wrs.13.2021.07.01.05.43.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jul 2021 05:43:21 -0700 (PDT) Message-ID: <8f20f2edd60fbff426b086599ae943ff09195b9c.camel@linuxfoundation.org> Subject: Re: [PATCH] cgroup1: fix leaked context root causing sporadic NULL deref in LTP From: Richard Purdie To: Mark Brown Cc: Tejun Heo , Paul Gortmaker , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Al Viro , Zefan Li , Johannes Weiner , stable@vger.kernel.org Date: Thu, 01 Jul 2021 13:43:19 +0100 In-Reply-To: <20210701121133.GA4641@sirena.org.uk> References: <20210616125157.438837-1-paul.gortmaker@windriver.com> <20210630161036.GA43693@sirena.org.uk> <696dc58209707ce364616430673998d0124a9a31.camel@linuxfoundation.org> <20210701121133.GA4641@sirena.org.uk> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.40.0-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2021-07-01 at 13:11 +0100, Mark Brown wrote: > On Wed, Jun 30, 2021 at 11:31:06PM +0100, Richard Purdie wrote: > > > Out of interest are you also seeing the proc01 test hang on a non-blocking > > read of /proc/kmsg periodically? > > > https://bugzilla.yoctoproject.org/show_bug.cgi?id=14460 > > > I've not figured out a way to reproduce it at will yet and it seems strace > > I've been talking to Ross, he mentioned it but no, rings no bells. > > > was enough to unblock it. It seems arm specific. > > If it's 32 bit I'm not really doing anything that looks at it. Its aarch64 in qemu running on aarch64 hardware with KVM. If you do happen to see anything let us know! Cheers, Richard