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 6CBF13FD97F; Fri, 26 Jun 2026 16:48:16 +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=1782492497; cv=none; b=uar6rG1nT1YeHU9xEFEtoXMRtvAsDirmZuBX7Pbum9pdBIvKkX7227DbcqyVuKg9a0jap1PLc6VRrKlk51ZE+l/ZqLezaCpp02i+YryDixdkmeqBvcNyeYNYKA63SkUbB+TkXxAVGynbYDUt9L2jJ5pMw4j4HJCDcxiBHLNwGiA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782492497; c=relaxed/simple; bh=kqQMX6p3gJpYDPPFZfaz8dPPveqaEbDjfZXNWLRlQcY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=g5mbvyS77EIUcHQQ1rbz1dsd30S5kbQax4esCHMvdLs2PhWlc9QzVltuiE8ip+iQaJFEKo6Sx7UAS8BhFxelA2NBdgF1Te86uesnwugcZ9wQBxgx0Q0YOOHkqBfwlzhQXGOK9ZRj/bLZKc12sAettjNCvQ3O9ccLt95hJaP4tDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LYowIE3z; 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="LYowIE3z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3A641F00A3A; Fri, 26 Jun 2026 16:48:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782492496; bh=EIOfnmKRgcg6/WVpNErw/tAuPn49TBDB0Zgm+aiIDZo=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=LYowIE3zHT65L3yx3Wg2Pc7tsrzHl7od8rIs8P9cvnyDXkw4WhgZZ8YhcZtapHXGY 4JLhh5/0WJRN5DtO/UKN5a2+adfmba/2ZJkpRkwrBOSNmywdWOrC7W+k/xq/xZk0L5 iRRHpYSROQbbdVdgOyGIV1TVvr45ULmRZXNIK/CYR2D5+4S1rljN7gm3XSHH3+qNTY Ov8Vlg/Zb11GgadP/u2OYKz1ZzrLytcMh6AVihJCijIRFyOe6W624F4sibuA/kJWYQ enJWj8qXdBBGaUUTIXA+qZMoZPflRq07uM37TkBGAJa02M/JNM5Ob82l113r3UaHkk CJaqKm75Z18RQ== Date: Fri, 26 Jun 2026 10:48:14 -0600 From: Keith Busch To: Jens Axboe Cc: Ben Carey , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] RCU hang with io_uring nvme polling Message-ID: References: <20260626150946.287781-1-benjamin.james.carey3@gmail.com> <85d1f999-7778-4c74-9d72-b8ac8500de31@kernel.dk> <1932a509-4e27-485e-8e09-1da67e0082c8@kernel.dk> <94614dd9-9351-4a64-83dc-4fc87e377e59@kernel.dk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <94614dd9-9351-4a64-83dc-4fc87e377e59@kernel.dk> On Fri, Jun 26, 2026 at 10:35:56AM -0600, Jens Axboe wrote: > Yes, it's a bad configuration. I bet it's as simple as: > > https://lore.kernel.org/linux-block/20260617155051.1266079-1-anuj20.g@samsung.com/ Yep, that's definitely the same problem. Thanks, I hadn't seen that thread yet.