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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E25FCECAAD3 for ; Thu, 1 Sep 2022 16:44:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235081AbiIAQoo (ORCPT ); Thu, 1 Sep 2022 12:44:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235110AbiIAQo1 (ORCPT ); Thu, 1 Sep 2022 12:44:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59C8F98353 for ; Thu, 1 Sep 2022 09:44:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9ADDC61FBC for ; Thu, 1 Sep 2022 16:44:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 091E3C433B5 for ; Thu, 1 Sep 2022 16:44:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1662050663; bh=ZaNBOwOeRhtaWwjNFN88fKlW+mcdTmPIHIX+XQ3hcO8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=ltVdE1BShiRVkoUDFwbtaUIHeTNQdGLqmCfbpb9SrIFsXc6kitpts0z3jmg8CXHwL aOqijl4AlELSmGhfjlaeuZXDoZCBje+gwLu5rEJQ9D3IRKdlDcGIAF/olpEm1ruQfF knn8R3dmTheP+sPJCmOX1IMf+5tPVZoQU+Px2HrFkFrn06XdXqx+ol3SEkHQwy8I3I za9VImIFJUWJ2h5HRJlkWaHhpGKV8uBdDx9GYD4sE+NCEVMeTrHcQNDz6NPLrr6JWP 1PO3hklGv7V9Zrk9Hh7yAtsQb4POabSsZt33DHp1r/BbtqTCHfVB+hJ3PwIRorsIqk fZAjNW8hIo9Ew== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id E92D6C433EA; Thu, 1 Sep 2022 16:44:22 +0000 (UTC) From: bugzilla-daemon@kernel.org To: kvm@vger.kernel.org Subject: [Bug 216388] On Host, kernel errors in KVM, on guests, it shows CPU stalls Date: Thu, 01 Sep 2022 16:44:22 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: high X-Bugzilla-Who: seanjc@google.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=3D216388 --- Comment #7 from Sean Christopherson (seanjc@google.com) --- On Thu, Sep 01, 2022, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=3D216388 >=20 > --- Comment #6 from Robert Dinse (nanook@eskimo.com) --- > Installed 5.19.6 on a couple of machines today, still getting CPU stalls = but > in > random locations: ... > Are these related or should I open a new ticket? These occurred rig= ht > after boot. Odds are very good that all of the stalls are due to one bug. Stall warnin= gs fire when a task or CPU waiting on an RCU grace period hasn't made forward progr= ess in a certain amount of time. In both cases, many times the CPU yelling that i= t's stalled is a victim and not the culprit, i.e. a stalled task/CPU often indicates that something is broken elsewhere in the system that is preventing forward progress on _this_ task/CPU. Normally I would suggest bisecting, but given that v5.18 is broken for you = that probably isn't an option. In the logs, are there any common patterns (beyond running KVM)? E.g. any functions that show up in stack traces in all instances? If nothing obvious jumps ou= t, it might be worth uploading a pile of (compressed) traces somewhere so that ot= hers can poke through them; maybe someone will find the needle. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=