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 79D8BECAAD3 for ; Wed, 14 Sep 2022 12:13:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229896AbiINMNs (ORCPT ); Wed, 14 Sep 2022 08:13:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229480AbiINMNp (ORCPT ); Wed, 14 Sep 2022 08:13:45 -0400 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 629B22C13E; Wed, 14 Sep 2022 05:13:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=W5j1Ml4/FGhqmMtCc95aFu4AVQsz1Mj8TqQkpBHoMxs=; b=WLJj4M0rV4tUTtnynNBIdEAd1U V3oKAsGc0iGaN1MleNa5z6efNVmmmsWL01bthSmyYxIXCmFRsPMo08m0aMDwjfpVIeJLNQ+AJD65j Om9Rr7vGAOAqXYUW00o/aj83DfLGc8Y5m4wRMnJOoPsyBuFIujgHBp/BBrwbZLgKxQgN5dvhClNIF iAApv+rNUMoovnStQEJIXg28oFxBWbf9BgZB3lAswMN2mfozEP7eWmW7TocGMl907sFf0+RJyf0PT InCig9B+9dr1mL0y1aHytN/33KpSXsSicc+uQ3kY7vLad0ZL82LXT96MofzZMIgWqKD3OW5iuzajx t6EZOb7w==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oYRGp-00CLtS-AT; Wed, 14 Sep 2022 12:13:35 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id A559D3002AE; Wed, 14 Sep 2022 14:13:34 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 8E1F02B1255A4; Wed, 14 Sep 2022 14:13:34 +0200 (CEST) Date: Wed, 14 Sep 2022 14:13:34 +0200 From: Peter Zijlstra To: Sergey Senozhatsky Cc: Petr Mladek , Steven Rostedt , John Ogness , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: Re: next: possible circular locking dependency: perf vs printk Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 14, 2022 at 07:22:15PM +0900, Sergey Senozhatsky wrote: > Hello folks, > > The lockdep splat below is pretty interesting. If I understand it > correctly: Known thing; only happens because you trip a WARN, fix that, problem goes away.