Received: by 2002:a05:6a10:a0d1:0:0:0:0 with SMTP id j17csp1290454pxa; Thu, 20 Aug 2020 07:38:11 -0700 (PDT) X-Google-Smtp-Source: ABdhPJx4zO1w3FQ/TyZIyC4tjifpmf2qWWeR+auWrI6/VCbdeH/j7zY/ahz5WNtsXGLVjk/QpCNf X-Received: by 2002:a17:906:ca5a:: with SMTP id jx26mr3429316ejb.62.1597934290846; Thu, 20 Aug 2020 07:38:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1597934290; cv=none; d=google.com; s=arc-20160816; b=AHzqjUvhPaYLQAO+3J4Hm6XXCIMlIKajyxeh7mqv9FIlSNjeDSkKZnkBz27yhvswnz S/2uH2y2zLY7zR7IrsY6r6YSVcDwfFfk63iZAJZwEI3nySk+M4IJK0nyEZr1xIJH/Jj7 BXcr9Jqr7/jInHXBRDfE3fSgrVIklpd4UBFfhNLaSw0TX1ZKG53xOqjcrTEhuJU1zwQW rAaVmyCCsa5zgPjFNX4V56wEHlueGAXCkuXgHrZHrNnd6UPXONTaYQN6lnBfmg24dG77 vz4FWlj6+vZKrJCkxdSbPuk6TEDswUN9fDX4Yg1bk/TVb+T3eA8k54M218gCg5q1aH56 5nJw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=AL6d5i0IyU7T8BQpDdfy0A+C7sPwniHUhehBZ1z8fsw=; b=bNeOdf1UHzo2THCcj+FwcvcnLCvqA/A1uiIQ93T6NeR/rvDSTJaBr9PNxExtoetre2 IQiDcB109wPre6qNFqFYalXjLxrcsMfZbceTZqDUEsceY/M66loM00ZtbDC9OIWxJEkY Zj6cHUMp0FCfxU+SaO0vUolgVsiLFaBZOXrjfUvmEm4EswLstQnmnHa9utKbPQn4kJek Pr/d7sSX1IdDiFqutaNIRf+NhfdsOaPfkS8EUP6KKuRQEnhQaNQB55necneHcC7iim+5 NHAeQg4nmdwe3ULgOvTgPSnEi3DL6p6xx39kxMEnlQ/Apu9ju2vVACZAwLLLAWphP5W7 hSPg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id u15si1335984ejy.685.2020.08.20.07.37.47; Thu, 20 Aug 2020 07:38:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728146AbgHTOgs (ORCPT + 99 others); Thu, 20 Aug 2020 10:36:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:34244 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726957AbgHTOgq (ORCPT ); Thu, 20 Aug 2020 10:36:46 -0400 Received: from oasis.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BE66D2076E; Thu, 20 Aug 2020 14:36:44 +0000 (UTC) Date: Thu, 20 Aug 2020 10:36:43 -0400 From: Steven Rostedt To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, will@kernel.org, npiggin@gmail.com, elver@google.com, jgross@suse.com, paulmck@kernel.org, rjw@rjwysocki.net, joel@joelfernandes.org, svens@linux.ibm.com, tglx@linutronix.de Subject: Re: [PATCH 0/9] TRACE_IRQFLAGS wreckage Message-ID: <20200820103643.1b9abe88@oasis.local.home> In-Reply-To: <20200820073031.886217423@infradead.org> References: <20200820073031.886217423@infradead.org> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I tested this series on top of tip/master and triggered the below warning when running the irqsoff tracer boot up test (config attached). -- Steve Testing tracer irqsoff: ============================= WARNING: suspicious RCU usage 5.9.0-rc1-test+ #92 Not tainted ----------------------------- include/trace/events/lock.h:13 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 RCU used illegally from extended quiescent state! no locks held by swapper/2/0. stack backtrace: CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.9.0-rc1-test+ #92 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016 Call Trace: dump_stack+0x8d/0xc0 lock_acquire.cold+0x23/0x2c ? default_idle_call+0x4d/0x210 _raw_spin_lock_irqsave+0x50/0xa0 ? check_critical_timing+0x69/0x160 check_critical_timing+0x69/0x160 ? default_idle_call+0x4d/0x210 stop_critical_timings+0xdd/0xf0 default_idle_call+0x4d/0x210 do_idle+0x1f6/0x260 cpu_startup_entry+0x19/0x20 start_secondary+0x110/0x140 secondary_startup_64+0xb6/0xc0