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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7124C433F5 for ; Mon, 11 Oct 2021 10:04:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BE41F604AC for ; Mon, 11 Oct 2021 10:04:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235761AbhJKKGQ (ORCPT ); Mon, 11 Oct 2021 06:06:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235719AbhJKKGE (ORCPT ); Mon, 11 Oct 2021 06:06:04 -0400 Received: from mail-ot1-x32c.google.com (mail-ot1-x32c.google.com [IPv6:2607:f8b0:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C1C4CC061745 for ; Mon, 11 Oct 2021 03:04:04 -0700 (PDT) Received: by mail-ot1-x32c.google.com with SMTP id v2-20020a05683018c200b0054e3acddd91so16507868ote.8 for ; Mon, 11 Oct 2021 03:04:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=BTfrofmPQUPweaAMFrrpDCsxkes27wM1OdN6B7aOuF4=; b=gNogjTGQmS3kUoqTukTRrppUYNKgp7EnaKzm2pyIOK6rwS18CxqfhXq49S8yxdu6Z9 PwP+UXFvcIPwxiCfGUgXqGYDMfQz5Bffn/jpxVg1zKDJXeIG6LKmch6235qPHv6Tz82M Idz81cY1JescUsKyXgGuvSeEBDZKfd1QI2gYwCTEviWZNFsMTRbJggihDcRSorMd9HA/ e3FsQDtV9bIHGk5rG0Bzv6xXkNa0xSFl/g1dw/MxbqRkqrPyjcnssg2NtHcVOA0nUUSm ew7gKQ2R+htDc9Zm5poNxBV9pigZFxTW5yvF0tulCYduHglka31trewxx5WwMIxFJKGb qhPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=BTfrofmPQUPweaAMFrrpDCsxkes27wM1OdN6B7aOuF4=; b=cWkjNpIlOEJWRtiHYbjMyIWN+OSO10TjF7THkDr504KVIYiLueL0/44ECQx2HKYAjy r2AkrNxNk+xo0X5rn4OeN51rrfMNbsokfgplrbbVWClnZnxk1kKnTj01ncNGilaveCYN 6ALe8d8FMOY6BzRmcmprOF43jM/ws15pdZMYDIX+YYsMZlCTIaxa2mN+KYwdGD21O2i+ Zu+9DRtlFgr707SrY1IkMZBKsCRgkaoSLuOmFOmZ0416tKGDgcWRl9bYKcYzS5UAoSfi eP3YB3j4CoJllxXnnu695GHk4gQ8V74q8nBdHTENwSe9IJsJ2ACLRT39lNwwgYxBAx/z ebkg== X-Gm-Message-State: AOAM5305dun8GLoMrmC0KwU3JZrwDolqEpKkuiogTdDthSTSsEgUrPmt 7mNCBF18DbdBna7EQzjcMbae3nc/794zLdixEAvFDg== X-Google-Smtp-Source: ABdhPJzx25ngeDCE3URdwsjKxtgM4s+Jz/2JV2ZclIUGP2NWMTqMM7rlS0+gpqZV1W3QBnIfyoDuomWcyPpax9g/XU4= X-Received: by 2002:a9d:6f04:: with SMTP id n4mr20153119otq.157.1633946643977; Mon, 11 Oct 2021 03:04:03 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Marco Elver Date: Mon, 11 Oct 2021 12:03:52 +0200 Message-ID: Subject: Re: BUG: soft lockup in __kmalloc_node() with KFENCE enabled To: Andrea Righi Cc: Dmitry Vyukov , Alexander Potapenko , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 11 Oct 2021 at 11:53, Andrea Righi wrote: > On Mon, Oct 11, 2021 at 11:23:32AM +0200, Andrea Righi wrote: > ... > > > You seem to use the default 20s stall timeout. FWIW syzbot uses 160 > > > secs timeout for TCG emulation to avoid false positive warnings: > > > https://github.com/google/syzkaller/blob/838e7e2cd9228583ca33c49a39aea4d863d3e36d/dashboard/config/linux/upstream-arm64-kasan.config#L509 > > > There are a number of other timeouts raised as well, some as high as > > > 420 seconds. > > > > I see, I'll try with these settings and see if I can still hit the soft > > lockup messages. > > Still getting soft lockup messages even with the new timeout settings: > > [ 462.663766] watchdog: BUG: soft lockup - CPU#2 stuck for 430s! [systemd-udevd:168] > [ 462.755758] watchdog: BUG: soft lockup - CPU#3 stuck for 430s! [systemd-udevd:171] > [ 924.663765] watchdog: BUG: soft lockup - CPU#2 stuck for 861s! [systemd-udevd:168] > [ 924.755767] watchdog: BUG: soft lockup - CPU#3 stuck for 861s! [systemd-udevd:171] The lockups are expected if you're hitting the TCG bug I linked. Try to pass '-enable-kvm' to the inner qemu instance (my bad if you already have), assuming that's somehow easy to do. Thanks, -- Marco