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 A1C1DC433F5 for ; Mon, 11 Oct 2021 10:04:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3C3EC604AC for ; Mon, 11 Oct 2021 10:04:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3C3EC604AC Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id A81856B006C; Mon, 11 Oct 2021 06:04:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A31656B0071; Mon, 11 Oct 2021 06:04:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 91FD16B0072; Mon, 11 Oct 2021 06:04:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0151.hostedemail.com [216.40.44.151]) by kanga.kvack.org (Postfix) with ESMTP id 80A376B006C for ; Mon, 11 Oct 2021 06:04:05 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 3A76D2DD60 for ; Mon, 11 Oct 2021 10:04:05 +0000 (UTC) X-FDA: 78683720850.02.8A80091 Received: from mail-ot1-f42.google.com (mail-ot1-f42.google.com [209.85.210.42]) by imf12.hostedemail.com (Postfix) with ESMTP id CA954100394C for ; Mon, 11 Oct 2021 10:04:04 +0000 (UTC) Received: by mail-ot1-f42.google.com with SMTP id u20-20020a9d7214000000b0054e170300adso20945315otj.13 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=4dVrU4I8Q6YZxttWg2GbAx3Gsod6tnJ4D0QfqT/hJ1ukgRuvB6MjBwPXC0K3cW+Y8z OOl09JQsw6c7YvuHX3gNq2fQ51JBcbHPcRy2pBZu+Fox40lAI7stfFuMG/WFkQLrqqDt wslJFGYBRv4EXmdv3ZKBo17DoBBCmnC24aHNor2SPwBLNnD8Hc4ov2eewmpAraBahAEr 5lE6RNITjrzo0eypcSrb00R5ehzGjgSaeYX8XLC7SdJk4NCZiusuDuK8mXPZhrvm4Bh8 yaV856epV+ydnFZNWsVcG4NAInD96EPiEnPqHZog0+ZCo5JJfXmQO8aThJlP+mPiRoWm VjvA== X-Gm-Message-State: AOAM530JFNXQVyLsxTy8yoK11AUEXiFmhGEAxh/z/lbZGXzXCyqdGk9W mxrsBvaCqTFsmb6oS4TLYFeW6oSvNqcO7TvKL0qw8Q== 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" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CA954100394C X-Stat-Signature: uatprf6tbn1fow5xnqefs6wjg9unt1wn Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=gNogjTGQ; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf12.hostedemail.com: domain of elver@google.com designates 209.85.210.42 as permitted sender) smtp.mailfrom=elver@google.com X-HE-Tag: 1633946644-244165 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 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