From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18])
	(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 41D6939903B
	for <linux-kernel@vger.kernel.org>; Wed, 27 May 2026 15:00:19 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1779894020; cv=none; b=jn3zV5h61eLdYSA6aipbc6CafEO42s7Az3n1aH3vrm97HLcBYoJCyuG6jY7383+2y+dCgZXQ1acH4Tf8HFfGu8dwTZ8ZUOxdDEG1TnhgXrVM0aVMbAJgfr1e0Ade/BeyMMQgNWEkpjLmG+Nzf9ab6uvIpqiHdAZTK0jlh8J2wng=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1779894020; c=relaxed/simple;
	bh=lfSJ/AVIHFhZlQvctIwl6yBEtII8T9ls09n6S0I1o3c=;
	h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
	 Content-Type:Content-Disposition:In-Reply-To; b=VSIomaNGRmZOG7fC2EXjMRLHFyL0WbJZ8WthgbsdQ7KN2FowHES5/Icj2oBKt7WRf6pj0tyKrWEr/8DHi707+cwmJQbsOeQXdhnCFwhlHZVoKiSTt2P9syW1X7nOfoFmHG2uYCwzPCNkiz5byqwcNUZD5bbndLX7LpiUHurXhxQ=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=N5y+8VfD; arc=none smtp.client-ip=100.103.45.18
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="N5y+8VfD"
Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9406C1F000E9;
	Wed, 27 May 2026 15:00:18 +0000 (UTC)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org;
	s=k20260515; t=1779894019;
	bh=WN2eycs/ujPks6xgujkmedWhK8TsKJSPP2kHz2LiIIg=;
	h=Date:From:To:Cc:Subject:References:In-Reply-To;
	b=N5y+8VfD44ic5nYieykQ5UQQMspzv7yUzHTkHqTVOzHbUihJJUkKRj9gFTcR/DJzn
	 JsIfbir+U5iN2aODgHCjDMcvwXF1xBBARoq0WzA2fJ2nBvCRdCcbfPwFSeN446TCME
	 AemygGppWFIQzCQxFrrKcf0vbqyj7U0NYD8A29SvaH2naH9eDGtVXSl681B+appMWH
	 XiTLmhoHNsYzWk36GcdTRxSgCIMOljOtkCxS3+zAozDiKdNyhC1VMFSxtkJ+SBo2tM
	 PI6ngBDhfAidBiXLDJP80R0KtHCMsgjzKowvfRpxDbvS83wosgOEth/NEapa3gfmFs
	 BQiiUioOnC/fg==
Date: Wed, 27 May 2026 09:00:17 -0600
From: Keith Busch <kbusch@kernel.org>
To: Chao Shi <coshi036@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
	Sagi Grimberg <sagi@grimberg.me>, linux-nvme@lists.infradead.org,
	linux-kernel@vger.kernel.org, Sungwoo Kim <iam@sung-woo.kim>,
	Dave Tian <daveti@purdue.edu>, Weidong Zhu <weizhu@fiu.edu>
Subject: Re: [PATCH] nvme: reject completions for requests that are not in
 flight
Message-ID: <ahcHAT6Mj3d2Jrqq@kbusch-mbp>
References: <20260522153034.2168862-1-coshi036@gmail.com>
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20260522153034.2168862-1-coshi036@gmail.com>

On Fri, May 22, 2026 at 11:30:34AM -0400, Chao Shi wrote:
>   Oops: general protection fault ... KASAN: null-ptr-deref
>   RIP: blk_mq_complete_request_remote+0xe5/0xa80 block/blk-mq.c:1319
>    nvme_handle_cqe drivers/nvme/host/pci.c:1418 [inline]
>    nvme_poll_cq drivers/nvme/host/pci.c:1449
>    nvme_irq drivers/nvme/host/pci.c:1463

This scenario doesn't sound specific to nvme. Should blk-mq completion
check for the IN_FLIGHT state instead?