From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-171.sina.com.cn (smtp153-171.sina.com.cn [61.135.153.171]) (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 88B9A1BC41 for ; Wed, 23 Jul 2025 01:16:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753233403; cv=none; b=sV8Wf1M63ul2yTK5HINgzNCszdMIzG6Wz5I+dxmRJ13lKHHg95OoyfetVeDkUsoFj6h9eI7akkaflotU5u635MYHxa9eAQwO7qlOhcm3NKL9EcKTd+X8eJMOTsfKFztEk9cBB7EwzXZhAQZRI05xHNl0j3WRWm8uIAadqiBd/0w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753233403; c=relaxed/simple; bh=HpWAxKz6dfEx2qW8PsoDIuxoAlc/svq1hqnRyFq7Tqo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lY6Sm9HgQCLpfIP4BMq2tah38Q+AcSGJNamvqa1u9X8i8ja2QWAjNmDMBRo0SoG4laWqnnh/pDeTiZt4nQ/Z6l1Z/+mxR8sdD1eGurchXl/9RlfsEmi/BpfrWTqhSThiPPAY3P/66ssRNP6sxgGt6D+zEvcQOdhbsWcEPJK+kXo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=yjGek5gU; arc=none smtp.client-ip=61.135.153.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="yjGek5gU" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1753233396; bh=UdnmmYRw0AJu5tW+PGAvB+7PLFGNJroJtC9cg2Qz3GQ=; h=From:Subject:Date:Message-ID; b=yjGek5gUDUiDjMMgHIWNLKPSEuwz3XvuMYMC3qfj4eN8u+spHjYoE3qM1YU1k8R15 Kze2/TH7Tv6N66PKZHpKn98HMMnhp+pmu4fO/8N3g8vX7BJdIEnUrbrxMBdtwkT+Aw wnq+bsu8l5i8YkJQ4+h6k0f0/fi2UOVjcTCzNxjY= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.34) with ESMTP id 688037E800006558; Wed, 23 Jul 2025 09:16:26 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 6659856291967 X-SMAIL-UIID: 56B947E8854B457CB095FF38F41598FD-20250723-091626-1 From: Hillf Danton To: Jens Axboe Cc: Mikhail Gavrilov , thomas.hellstrom@linux.intel.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Ming Lei , regressions@lists.linux.dev Subject: Re: 6.15/regression/bisected - lockdep warning: circular locking dependency detected when plugging USB stick after ffa1e7ada456 Date: Wed, 23 Jul 2025 09:16:13 +0800 Message-ID: <20250723011614.2812-1-hdanton@sina.com> In-Reply-To: <8acbc346-98f8-44fc-9675-0c3a7da87d21@kernel.dk> References: <20250722005125.2765-1-hdanton@sina.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Tue, 22 Jul 2025 06:14:18 -0600 Jens Axboe wrote: > On 7/21/25 6:51 PM, Hillf Danton wrote: > > Try the diff that serializes elevator_change() with q->elevator_lock if > > reproducer is available. > > Hillf, these seemingly random and not tested or thought through patches > flung out in response to reports is not useful. It just wastes peoples > time and resources. > Interesting, if you are right, so does the guy who created the deadlock, no?