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=-4.1 required=3.0 tests=BAYES_00,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 B6B7FC433E1 for ; Thu, 23 Jul 2020 14:46:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91CB020768 for ; Thu, 23 Jul 2020 14:46:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ug2TEUNq"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="aX7htOkj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728567AbgGWOqH (ORCPT ); Thu, 23 Jul 2020 10:46:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726761AbgGWOqH (ORCPT ); Thu, 23 Jul 2020 10:46:07 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CBE19C0619DC for ; Thu, 23 Jul 2020 07:46:06 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1595515564; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yGvcyUU8IIK/MQJUoGdWT+9Rmu88PZaZBBf5NFsBArs=; b=ug2TEUNqIyDZnJ4+S8ihC9um70TC2nXQEW9+UEVy4nMkodbPtQxPqJqW22ktsmOsoO0CsD d0pbEzDxvTpJC9Ph+zwBLe/FZvunbdZFRSttYS8AcnDrxAWP+clYfmoXTIdFuN/G2Yc30q vJDdUk7eK2JakPNen5cNwsKd31QBEoDWlY2fFluFRU0GII/NiYCLTNGK0AFAv6WnKYyRD5 NJ84srLC0hxvvJ2I2hm7XyCZ8Fw1hSEbNuYo+2bRIVDd3Q8/OEK+ZFIhAiTFkPVZIGVr8k xzlUAoEbbEapnOZ8Lxlz7h/AX3jVRkD1bqp1afcwqcOz74fl/L4ojK9IOz9M7w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1595515564; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=yGvcyUU8IIK/MQJUoGdWT+9Rmu88PZaZBBf5NFsBArs=; b=aX7htOkjDbnrg2SZGus2XLjG06kfuiwxdqCnEqSQ97ZbL2fOOrCjK6g4ncU3a9zYjPK2Up +GD3xT+X2FuiwTBw== To: Joerg Roedel , x86@kernel.org, Peter Zijlstra , Arnaldo Carvalho de Melo , Andy Lutomirski , Dave Hansen Cc: linux-kernel@vger.kernel.org Subject: Re: Regression on todays tip/master (commit 16f70beccf43) In-Reply-To: <20200723133743.GA30716@8bytes.org> References: <20200723133743.GA30716@8bytes.org> Date: Thu, 23 Jul 2020 16:46:04 +0200 Message-ID: <871rl2xpar.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Joerg Roedel writes: > while testing the SEV-ES patches on todays tip/master I triggered the BUG > below: > > [ 137.629660] ------------[ cut here ]------------ > [ 137.630769] kernel BUG at kernel/signal.c:1917! > [ 137.631796] invalid opcode: 0000 [#1] SMP NOPTI > [ 137.632822] CPU: 3 PID: 28596 Comm: test_syscall_vd Not tainted 5.8.0-rc6-tip+ #3 > [ 137.634495] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 > [ 137.636236] RIP: 0010:do_notify_parent+0x25c/0x290 > The guest had 4 VCPUs and ran 4 instances of the in-kernel x86-selftests > in a loop, together with 'perf top -e cycles:k'. As you can see in the > time-stamps, the issue triggered pretty quickly. > > Please let me know if you need more information or testing from my side. Any chance to bisect this? Thanks, tglx