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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7792BC433F5 for ; Tue, 19 Oct 2021 20:34:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5694461212 for ; Tue, 19 Oct 2021 20:34:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234783AbhJSUhI (ORCPT ); Tue, 19 Oct 2021 16:37:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35754 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230147AbhJSUhG (ORCPT ); Tue, 19 Oct 2021 16:37:06 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1FBCC06161C for ; Tue, 19 Oct 2021 13:34:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=jQk7zjHB0gPoX00cDocKNrAvGgoKnQS6YZIN9q19mQU=; b=Kc3bNV+r3pphi8bq2HNYdy5jYA 3bppYx5YRml80T6wJb2fzwechqqOpsEIPJWku3v7aJtZ1Dy1DS3bAWoJJnqzGZYR2NRdNIG6yM9eK uCM8QcZV2OfAzeF0he5wvZ07ClTDSBMnLmGBTNQl4hVltqvARN1cZuBQzh+EDrR4svFDMz6GsJ4Zv KbOVJ9PW0CEv5VRmB63ZP3b1vUykECddU2BjZ5O4mBXu41KWMchLuSMwDUmU/KrQBYr4Lr3Kzr3yY 1NjhCJFlO/p6hxyOKKvAFX+c939PuV90lX65xYOXDRckYTa2kl2UntzZIZSL6/ic9aP4G3qpnA10Z 01ifadcg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mcvi2-00BzTi-Js; Tue, 19 Oct 2021 20:28:05 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id B0E56986DD9; Tue, 19 Oct 2021 22:27:41 +0200 (CEST) Date: Tue, 19 Oct 2021 22:27:41 +0200 From: Peter Zijlstra To: Sebastian Andrzej Siewior Cc: syzbot , bristot@redhat.com, bsegall@google.com, dietmar.eggemann@arm.com, gor@linux.ibm.com, jgross@suse.com, juri.lelli@redhat.com, linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@kernel.org, mingo@redhat.com, namit@vmware.com, rdunlap@infradead.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com, vincent.guittot@linaro.org Subject: Re: [syzbot] possible deadlock in wake_up_all_idle_cpus Message-ID: <20211019202741.GN174703@worktop.programming.kicks-ass.net> References: <000000000000cf252605ce67014a@google.com> <00000000000041567305ce80b8af@google.com> <20211019190811.ubam63tfv33c7lmx@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211019190811.ubam63tfv33c7lmx@linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 19, 2021 at 09:08:11PM +0200, Sebastian Andrzej Siewior wrote: > Does this do anything useful? I've got https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=sched/core&id=3dfddc2f0f76525218dd2d0c8725d9f21dd411e2 There's like 3 or 4 threads on this :/ I just got a tested-by on that.