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[209.132.180.67]) by mx.google.com with ESMTP id q6si4127252otf.301.2020.01.25.08.47.35; Sat, 25 Jan 2020 08:47:48 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel-dk.20150623.gappssmtp.com header.s=20150623 header.b=DOoL2RfM; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726428AbgAYQqp (ORCPT + 99 others); Sat, 25 Jan 2020 11:46:45 -0500 Received: from mail-pj1-f68.google.com ([209.85.216.68]:54664 "EHLO mail-pj1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725843AbgAYQqo (ORCPT ); Sat, 25 Jan 2020 11:46:44 -0500 Received: by mail-pj1-f68.google.com with SMTP id dw13so744514pjb.4 for ; Sat, 25 Jan 2020 08:46:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=Da0HM3we7N/C1GUMxu+zimrEHhE4JWPgKR0nOJHOax0=; b=DOoL2RfM7S03QgOEhu9APCrjgDReQAzGLqgnqfVD/kg3Wnb/WyeqAXAHjIWfft58gv Fn7DMFWB+E7KZI66PXQVf47Ugp6ccVqVDXTgHqyBnuv3rpzf0bdkHZwkWL+NFx6RwxWL sCMYTwSAjxbhs1HtqMjYSzgHRiVdDeVE13dEpjCOGxFdoI5fspABUYMLFbXspnBfCKSJ NKUp0+FVBRnCSdSM1WbYPc4SQ4WXWjDwH0vsFqXDDXDzQ9OZRxC4LQpCAnLf2Imtbhzk Pu1N/QT+4TxPqbmKcWzDeS6BBT+WXB2vLEPpFo5gcjwhYxwhzGfJmXeSfklOEECTL8zI K7DA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Da0HM3we7N/C1GUMxu+zimrEHhE4JWPgKR0nOJHOax0=; b=A+fWkfpdjZYw/J3ODe3EXP3t141Krpkfb5vCkkqWwFqC0Csj2STyyoSWLMQrauA5+9 UV05HwImW11F6UNbnn78KK/3jiGjazvDFz7yY+zqBRJrPKavluHPhED/ACLBw1ChhOXl aVlmHS+qq9VMXcO5fbpybAI9UKopZH3a6qX7n0+vKhTJd/Z/Mr1glwFyfHeEX3dp2HAa mEL9m4Ay7fAvlvV+uSqcRMol8J0lN6Z8jtzoIJqVIJjtuqSBbWYa4eggjBQmePF46tqi CYjtZE1IwpWyBLod7fvtoRiFn14loBLWgvI+zFi4H/ILqpTjZtIrfROkLCyij8NKy6Ud wqdg== X-Gm-Message-State: APjAAAUBEVhjUKBXt9X3P5TwI0P8ghnUn5mQfPh3uMN8WzMQIDPn0g6P qfM6XZDMeBlaqeO9CdcZ8S3ySi/LBUY= X-Received: by 2002:a17:902:7d86:: with SMTP id a6mr9752568plm.212.1579970804021; Sat, 25 Jan 2020 08:46:44 -0800 (PST) Received: from [192.168.1.188] ([66.219.217.145]) by smtp.gmail.com with ESMTPSA id r3sm10273769pfg.145.2020.01.25.08.46.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 25 Jan 2020 08:46:43 -0800 (PST) Subject: Re: [PATCH 1/1] io_uring: fix refcounting with OOM To: Pavel Begunkov , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org References: From: Jens Axboe Message-ID: <78a57f0e-2412-472a-86c2-5e634a74147f@kernel.dk> Date: Sat, 25 Jan 2020 09:46:42 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/25/20 1:59 AM, Pavel Begunkov wrote: > In case of out of memory the second argument of percpu_ref_put_many() in > io_submit_sqes() may evaluate into "nr - (-EAGAIN)", that is clearly > wrong. Can you reorder this one before your series, I haven't had time to take a look at that yet and I don't think this bug fix should depend on it. -- Jens Axboe