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=-3.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 8D812C433E0 for ; Wed, 12 Aug 2020 08:57:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 668472076B for ; Wed, 12 Aug 2020 08:57:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="oA0RL+AU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727797AbgHLI5u (ORCPT ); Wed, 12 Aug 2020 04:57:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726595AbgHLI5t (ORCPT ); Wed, 12 Aug 2020 04:57:49 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 741C0C06174A for ; Wed, 12 Aug 2020 01:57:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=nuSjbKLmgFUpujyztO9pZIgg8RwXK/k205UIQiNkmjY=; b=oA0RL+AUZC/9NzFpw32e8YGbiG 0VcMjRTkK6gzyi6LHeQnGMZedrE247e0AD0iS9PuK19STFCes37/7sZrX2+QhWxirH2ub40je4iSp eTVV6/KGsbaHq+ZjwBe0fSjKLulkT0uN3I1uNocq1V2rleacFT0UF1OA3jexfzOBZJuS/DI+oZDlq cke/wCMKg4rXrUcFiI0Vwu+4dhGJukasRcaQhlVemsjENOmzGa5wH1E/hJztIE2IqScefyAxnVEd0 FHgbU+yagNuIlrDxAdcOW3YNd1gw/+VNhqX8mx0uvYlgj5jc1KnHHWYHoE5T0UnEnArqR0mQRo7p2 RtNwIp6Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k5mZT-0007yN-FP; Wed, 12 Aug 2020 08:57:19 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 3137830753E; Wed, 12 Aug 2020 10:57:17 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 0F43625D0D543; Wed, 12 Aug 2020 10:57:17 +0200 (CEST) Date: Wed, 12 Aug 2020 10:57:17 +0200 From: peterz@infradead.org To: Marco Elver Cc: =?iso-8859-1?Q?J=FCrgen_Gro=DF?= , Borislav Petkov , Dave Hansen , fenghua.yu@intel.com, "H. Peter Anvin" , LKML , Ingo Molnar , syzkaller-bugs , Thomas Gleixner , "Luck, Tony" , the arch/x86 maintainers , yu-cheng.yu@intel.com, sdeep@vmware.com, virtualization@lists.linux-foundation.org, kasan-dev , syzbot , "Paul E. McKenney" , Wei Liu , Steven Rostedt Subject: Re: [PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers Message-ID: <20200812085717.GJ35926@hirez.programming.kicks-ass.net> References: <20200807151903.GA1263469@elver.google.com> <20200811074127.GR3982@worktop.programming.kicks-ass.net> <20200811081205.GV3982@worktop.programming.kicks-ass.net> <07f61573-fef1-e07c-03f2-a415c88dec6f@suse.com> <20200811092054.GB2674@hirez.programming.kicks-ass.net> <20200811094651.GH35926@hirez.programming.kicks-ass.net> <20200811201755.GI35926@hirez.programming.kicks-ass.net> <20200812080650.GA3894595@elver.google.com> <20200812081832.GK2674@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200812081832.GK2674@hirez.programming.kicks-ass.net> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 12, 2020 at 10:18:32AM +0200, peterz@infradead.org wrote: > > trace_hardirqs_restore+0x59/0x80 kernel/trace/trace_preemptirq.c:106 > > rcu_irq_enter_irqson+0x43/0x70 kernel/rcu/tree.c:1074 > > trace_irq_enable_rcuidle+0x87/0x120 include/trace/events/preemptirq.h:40 > > trace_hardirqs_restore+0x59/0x80 kernel/trace/trace_preemptirq.c:106 > > rcu_irq_enter_irqson+0x43/0x70 kernel/rcu/tree.c:1074 > > trace_irq_enable_rcuidle+0x87/0x120 include/trace/events/preemptirq.h:40 > > trace_hardirqs_restore+0x59/0x80 kernel/trace/trace_preemptirq.c:106 > > rcu_irq_enter_irqson+0x43/0x70 kernel/rcu/tree.c:1074 > > trace_irq_enable_rcuidle+0x87/0x120 include/trace/events/preemptirq.h:40 > > trace_hardirqs_restore+0x59/0x80 kernel/trace/trace_preemptirq.c:106 > > rcu_irq_enter_irqson+0x43/0x70 kernel/rcu/tree.c:1074 > > > > <... repeated many many times ...> > > > > trace_irq_enable_rcuidle+0x87/0x120 include/trace/events/preemptirq.h:40 > > trace_hardirqs_restore+0x59/0x80 kernel/trace/trace_preemptirq.c:106 > > rcu_irq_enter_irqson+0x43/0x70 kernel/rcu/tree.c:1074 > > Lost 500 message(s)! > > BUG: stack guard page was hit at 00000000cab483ba (stack is 00000000b1442365..00000000c26f9ad3) > > BUG: stack guard page was hit at 00000000318ff8d8 (stack is 00000000fd87d656..0000000058100136) > > ---[ end trace 4157e0bb4a65941a ]--- > > Wheee... recursion! Let me try and see if I can make something of that. All that's needed is enabling the preemptirq tracepoints. Lemme go fix.