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=-5.8 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 E50FEC433F5 for ; Thu, 2 Sep 2021 21:51:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D167F610F7 for ; Thu, 2 Sep 2021 21:51:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347580AbhIBVw0 (ORCPT ); Thu, 2 Sep 2021 17:52:26 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:46604 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347579AbhIBVwR (ORCPT ); Thu, 2 Sep 2021 17:52:17 -0400 From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1630619476; 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=dXynEmzNc/5dqTNv5HfEcE9bg8jjd3nUt9vOKJo805g=; b=gjfK/xwMuN9qpul1qSXhGslQ5t0nlyga/qktDHqC7NLiRuqSCV3dNDUrG31I3xhHvtTBYR eyOe46X1PIx8v8/FTSKnDLmxJGa2uTStHYYdpmKrUUqedP2C1g5aLPCGOsDyk/ijzp3W1b wQHju2K2Wk2WCixBAm6JMc9pNlBXn/34ZPnVzBzA5i00cYdiUfn2rBJrXA66NSxCodjPzy DX3c4hOtFKu2UJDZM3iiVwGZmeZmBvXvz0mcKVge96ATKWCAu7f9U87iRsep08m2Uioegk rYSwhawWZ7M2AwYrjAaBxQVdAoHOOjU4FsNyHtHGgw+NnlurxFvGVS5ePW94kg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1630619476; 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=dXynEmzNc/5dqTNv5HfEcE9bg8jjd3nUt9vOKJo805g=; b=16abJ3hXdJEEYi5ibns/xE8FQnkkGA7BJ0g5VzZdgAy+bR4tNJbN2ke+YAEj2uGjAouUnW AQP7Rf0g6s7ZwGAQ== To: paulmck@kernel.org, Fabio Estevam Cc: Kalle Valo , ath10k@lists.infradead.org, linux-mmc , Ulf Hansson , Marek Vasut , qais.yousef@arm.com, frederic@kernel.org Subject: Re: NOHZ tick-stop error with ath10k SDIO In-Reply-To: <20210818175604.GX4126399@paulmck-ThinkPad-P17-Gen-1> References: <20210818154358.GS4126399@paulmck-ThinkPad-P17-Gen-1> <20210818175604.GX4126399@paulmck-ThinkPad-P17-Gen-1> Date: Thu, 02 Sep 2021 23:51:15 +0200 Message-ID: <87czpqbq98.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Paul, On Wed, Aug 18 2021 at 10:56, Paul E. McKenney wrote: > On Wed, Aug 18, 2021 at 02:02:17PM -0300, Fabio Estevam wrote: >> On Wed, Aug 18, 2021 at 1:29 PM Fabio Estevam wrote: >> > On Wed, Aug 18, 2021 at 12:43 PM Paul E. McKenney wrote: >> > >> > > I believe that you need this commit (and possibly some prerequsites): >> > > >> > > 47c218dcae65 ("tick/sched: Prevent false positive softirq pending warnings on RT") >> > > >> > > Adding Qais on CC for his thoughts. >> > >> > Thanks for the suggestion, but I am running 5.13.11, which already >> > contains this commit. >> > >> > Any extra logs I should capture to help us understand the problem? >> >> In case it helps, I followed your suggestion from: >> https://lkml.org/lkml/2020/12/10/676 >> >> With the debug patch and suggested command line, I get the following log: >> https://pastebin.com/raw/X96zKw7i > > And it turns out that I am also seeing it in v5.14-rc2, just a lot less > frequently than earlier. I have seen three instances of handler #02 > (NET_TX_SOFTIRQ?) over the past month or so while you are seeing handler > #08 (BLOCK_SOFTIRQ?), in case that makes a difference. Huch? #02 is TIMER_SOFTIRQ and #08 is NET_TX_SOFTIRQ. And looking at that ftrace output in the pastebin there is nothing which raises NET_TX_SOFTIRQ but then the warning claims it is pending. This does not make any sense at all. Thanks, tglx