From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FE5B1CB50B for ; Tue, 1 Oct 2024 16:41:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=212.227.17.20 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727800911; cv=none; b=OEJZhKkHmC4+1BdYtbrVoL4sqvfrM+WupDeCGttllvmfpaX+PAWAOWEgPpi0QxMXu26tjEN9TAWrlRlDZ4tYLyl1kB/dyggBRz0V8L3xD3VjYniANqiMLsc72ulOTSToGdoZD2726gDjwto2JXtJRkzxVVrLi+V4+CkIUAkvp4U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727800911; c=relaxed/simple; bh=eqIdfM/5GzZZ8dG9Rh6LyOe3nn6hj/9ZozG3ehitKwc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=nOLCUt0M0LTFjdQ4sZU2jgjiTiFyPtX3Ua0+HpYQZkicBEz6aviqwKZJhIogN98UrfYtPHC7+UJkSkxqEUSOtc4bQ2q17TwxmXPeLfTbf5513Gh/xpzzpXoGzRnHxkE5N11V3A+lmnNIUjp1yPnoT0ztkwvnQik71067NnfO2Ls= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de; spf=pass smtp.mailfrom=gmx.de; dkim=pass (2048-bit key) header.d=gmx.de header.i=efault@gmx.de header.b=IVYmLfKK; arc=none smtp.client-ip=212.227.17.20 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=gmx.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmx.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmx.de header.i=efault@gmx.de header.b="IVYmLfKK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmx.de; s=s31663417; t=1727800887; x=1728405687; i=efault@gmx.de; bh=PQB0y9pDvzFa1uwk3tQ17n5aIWodUcrXfv4huXSatMg=; h=X-UI-Sender-Class:Message-ID:Subject:From:To:Cc:Date:In-Reply-To: References:Content-Type:MIME-Version:Content-Transfer-Encoding:cc: content-transfer-encoding:content-type:date:from:message-id: mime-version:reply-to:subject:to; b=IVYmLfKK5dj5lmCySQjq7CFwJsDUZOk6i7G/zwz27UFeTBdnhzdWThA7XyrFe6se iZIGVqCm3JDVPrzj7XsyHwICXU/uVNVrMZ7csB483ztGdH8++tcKLVEbug5j39zId rjg0SzojR0rBXqH/52COhYPX7T0/24WXcEWAJQnQneOEBI9xHNTqC8p12hV0M8Z1n DewwrKvqUUEl1DO7usp+LCjCN9QmkRGBj6y05HNuG0y5JiIOhkkSQhtaykkprLao3 hbQrP/6M9VT7DJ6KzF6j1wHtAG6nas7DqFmfjRvnQXMremJpcFOJP+42OUPVbJYWY Y4VyA21u3YyfRiDk0A== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from homer.fritz.box ([91.212.106.56]) by mail.gmx.net (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MLR1f-1seyAO1Bjv-00MEss; Tue, 01 Oct 2024 18:41:27 +0200 Message-ID: <09e16088690e6577b60de489e6e52a3e5769f96f.camel@gmx.de> Subject: Re: sched/fair: Kernel panics in pick_next_entity From: Mike Galbraith To: Vishal Chourasia Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, Ingo Molnar , Vincent Guittot , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , luis.machado@arm.com Date: Tue, 01 Oct 2024 18:41:25 +0200 In-Reply-To: References: <20240930144157.GH5594@noisy.programming.kicks-ass.net> <55a2acefffb8c99e4234bd18656a75625447c2d0.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.4 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:tl1THx8lYapu0ztgCnzSb7J2K+gIP7xe4Loy7LPzo9U5Euc89lM Bdt4HNnB+8nN0at5j20M1C4UVMSw+ZzlWDFKuql60sjhuAAHh8kuggGb3zQEh4HhONNQTTc 9cjqwchc7DWqwqOb3xAON9La2mUeGny2ZZRGccmD1AxcfQcmm6X02AmXPLhV5iK0R+1HIup yXyhQlw6UkES0Q8gM43cA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:x7RwGw3kRko=;xd8K+mFFZLB4QImdYa9pbY9mHaX 3V28mumL3/edI+Ld0oRPmk7UYDvxipzcJhR8YLKn6PAuRElO4yk3+cqG3WmP9Hli5ygrvvfvQ vjxqYPSMaViEtuxp56WxqwtEUg1CTqRpZ8GwePD//XyY3byjrWlo9ZIv49m5l5rvyFunj1dwi eefTKW8HpVfxypQqQ7u4TS5TOtjfnCqj9ARtgk0jk0YtaUMDfd3gWe1GJnoEdYWGilvNFIZ91 UKPSWDiJys5mdKyZM2PLZbUiX2mjMt9RnGAo4els2D+cawvmb6Fg51f/NtDx5JlDLsas4X3Fu ns9FGB1M5mqP6M38fM+GZAAe/OKwpsM6llPEaLSPjlpeKFtXWnjz9fwlaIdasco8Gn0QIughf 9D7MV2VRHtFg4qG6jJ2CugzrwOcYSxpMHOksCN6fdBKCVSG5rXXbfVV9fW+SBz1GIf6Vxq1Z5 911mC88/zXY3am5cgpeobc7Mznms7k1pYijbeaB8E0K8PFCTjSW8Gyqq6Ga3XaHuCkzuI2Vg+ ueQWQ3+q9oRQSr3UPEw154giVEvfwMDQy9hE3mkES9dQPcH4aVH/2enh6A0Va1UGmOkYk7CHh pEj5YXGkTS1Ti46teKiZGUrIYMFa0lcc11A/kWRgNqfQd4ROl63R9pBIi2GC8K/bKPfXki+12 rkAhttfZZg6xuPT4FMM1PCwFZrwmHN9JjKDt+na+VPKn/IpDPHJoSpjPKmtdcfD1SqiU+m7Lx T1plWLklIOM8+JBjnNimUWZrY3nM2qCtqPI00tS5jNjooOdDC+32p58RrxLluTeq97S1DI9yh Z3bWNdzqQp06DRbZ57OYrHyw== On Tue, 2024-10-01 at 19:38 +0530, Vishal Chourasia wrote: > > With the below changes, I don't see any warnings been printed on the > console, along with it, there were no kernel panics Darn. I was hoping to quash the easily reproducible noisy avalanche of doom to let elusive $subject through, that being way more interesting. When I hit $subject, LTPs cfs_bandwidth01 was running, but there was no warning prelude, box went straight to panic. Trying to reproduce using that testcase plus hackbench as efficacy booster produced lots of dying box noise, but zero sneaky $subject instances before or after quash. -Mike