From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from va-1-112.ptr.blmpb.com (va-1-112.ptr.blmpb.com [209.127.230.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DC73D64A8C for ; Fri, 21 Aug 2026 02:46:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.127.230.112 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787280412; cv=none; b=QztimGO1Kz/hnyUEPbnpifbePR7XXZ8bEonIAE9q+f6SyxFG0yKU6weNCk6E7AaOx3wXi0SYVjSU2mwqIRHuS1X+LQ66jPmF08TXpXV28qbfgwEKIsP/2NEYVds4s5V0omIcV2hkc5rXtfOQRJUufoch5/YpnspPZ1eyF/5fM7E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787280412; c=relaxed/simple; bh=Ch+7SF+sOZTCXktAqiF7MGwQr+SURLv5hFfMNFY3zSw=; h=From:Subject:Mime-Version:References:Content-Type:Message-Id: Content-Disposition:Cc:To:Date:In-Reply-To; b=gvxGLYAEgWKumjQkX75OQNcr+ztwCLhu30gaWHOLlR/q9bQOR7Y/WoVezEMEObTyBxs4rpwVqPra/1Maa7eZuMjhLCzEMmYy7+oUjC9WJKLi2eEN3j+CQC6h8NNp/dvpg+9NvQMM9amAN3vCvEveRWstm3xYrtu2SEVuEfqCLXs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com; spf=pass smtp.mailfrom=bytedance.com; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b=K6gTnV7s; arc=none smtp.client-ip=209.127.230.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=bytedance.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bytedance.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bytedance.com header.i=@bytedance.com header.b="K6gTnV7s" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=2212171451; d=bytedance.com; t=1787280279; h=from:subject: mime-version:from:date:message-id:subject:to:cc:reply-to:content-type: mime-version:in-reply-to:message-id; bh=OqM4IpjaMophRaJfsLYFSpJQEmfnF7LIDPTK7Kp59eY=; b=K6gTnV7sVIUxUdeRCrI6gcTJnE7uD61wSR4A4WgpZi1+bwHexis/C+rR7qtjiweD5ZX0Bw Jn5i0mQjIGu2lIFoRdehvsSOfcTgbtOeKhra5eHhAi3x7vtsCypTaf0o9swzB9RmXM0ntc Xiq/AW5IQ4yXLGxRa0HnJUJ2nBKVK1/x/Aep5zv+DlZ6JPgidFrhQziKBb11s8V2BnI0Tb 8QZAfBrMD9nTGyFIp4WCbiEw7R4UvqZ5E49DKWQyw8eocm00l5mrDUjE+fNmI6fzrPpWRV GkcpAwO+/5Yp7X8Cvj9I7GGADXwf/avKcBEn9zbDSzBttrZ/BwL0o24KfhobaQ== From: "Aaron Lu" Subject: Re: [PATCH 0/2] sched: Remove sched_class::balance() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260624121327.190063948@infradead.org> <20260702114919.GA186418@bytedance.com> <20260820154052.GB4120091@noisy.programming.kicks-ass.net> Content-Type: multipart/mixed; boundary=52d73be81beae0f0b3f8e23e64920e9e3ff78a0a06192fa6ff389040baf0 Message-Id: <20260821024335.GA3046103@bytedance.com> Content-Disposition: inline Cc: , , , , , , , , , , , , X-Original-From: Aaron Lu X-Lms-Return-Path: To: "Peter Zijlstra" Date: Fri, 21 Aug 2026 10:44:08 +0800 In-Reply-To: <20260820154052.GB4120091@noisy.programming.kicks-ass.net> --52d73be81beae0f0b3f8e23e64920e9e3ff78a0a06192fa6ff389040baf0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 On Thu, Aug 20, 2026 at 05:40:52PM +0200, Peter Zijlstra wrote: > On Thu, Jul 02, 2026 at 07:49:19PM +0800, Aaron Lu wrote: > > > The test caused a panic with below msg: > > What test do you run? I think all I have is the prctl selftest thing. Self-created test for bandwidth testing purpose. The test machine is gone but I backed the test scripts and I think that is what I run :-) I've attached the test scripts for your reference, ./test.sh should trigger the problem. The test.sh would set quotas but the problem can be triggered no matter quota is set or not. nop is just a user space cpu hog like: while (1) { cpu_relax(); } --52d73be81beae0f0b3f8e23e64920e9e3ff78a0a06192fa6ff389040baf0 Content-Disposition: attachment; filename="coresched.tar.gz" Content-Transfer-Encoding: base64 Content-Type: application/octet-stream; name="coresched.tar.gz" H4sICBi5h2oAA2NvcmVzY2hlZC50YXIA7Vx9bBzHdZ87UhJ5iixSjmzKcqL1iRKoVLxvHpmTKR9F nXgKaJGlKFWto6yOd0ty7bvd8+6eTH21TuQkYO0CCmAk/wSo2yIGEgSG4RiFYwMWHdWyVfQPuYFR /VPEKGxAqmxDaZ3UbW1d5uPN3e7wjlISSkGS+dm8t/Pmfc3s7Oy83R3lTUuz87NaIYxuGSIY/X19 hEb7+6JuyoGifbFEtD+eiCdiKBKNx/qTSOm7dSHVUbGdnKUo6Lj+qJ4zipVmcjeq/z1Fvnb+80Ut Z1TKIXt2uX3c4PxHI4kkPv/RSF8k1h/rx3w8GJIRpESWO5BG+CM//8Mj6sTY2ORg2D5mh6ftcH7G MivlQMCw1KJ2VCtGB2O149hgtHYcx8eB8iN6sagYZhmObLOkBQLTpqXoim4oR2ztUaW7ZunIDqVg Btqxx9HMwcxodLAbnIe79UC7lp81lWB+BoRTSndNMBhof0jpLbg4ymHl5EklbxqOblSwy3bi8+HF PmPgs+Y0Nlg3Eu4+oZ9Sux/G1V7nMZfzGHYueI8t8k7dP7LYfZy7r/mP1/3HwP+Jh/HPI0TIG0Xc 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