From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6803C19F2B for ; Wed, 27 Jul 2022 18:53:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235493AbiG0SxC (ORCPT ); Wed, 27 Jul 2022 14:53:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230274AbiG0Swp (ORCPT ); Wed, 27 Jul 2022 14:52:45 -0400 Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B6E412B39D; Wed, 27 Jul 2022 10:47:45 -0700 (PDT) Received: from [10.10.2.52] (unknown [10.10.2.52]) by mail.ispras.ru (Postfix) with ESMTPSA id DF94640737A5; Wed, 27 Jul 2022 17:47:41 +0000 (UTC) Subject: Re: [PATCH] Introduce the pkill_on_warn boot parameter To: Linus Torvalds Cc: Petr Mladek , "Paul E. McKenney" , Alexander Popov , Jonathan Corbet , Andrew Morton , Thomas Gleixner , Peter Zijlstra , Joerg Roedel , Maciej Rozycki , Muchun Song , Viresh Kumar , Robin Murphy , Randy Dunlap , Lu Baolu , Kees Cook , Luis Chamberlain , Wei Liu , John Ogness , Andy Shevchenko , Alexey Kardashevskiy , Christophe Leroy , Jann Horn , Greg Kroah-Hartman , Mark Rutland , Andy Lutomirski , Dave Hansen , Steven Rostedt , Thomas Garnier , Will Deacon , Ard Biesheuvel , Laura Abbott , David S Miller , Borislav Petkov , Kernel Hardening , linux-hardening@vger.kernel.org, "open list:DOCUMENTATION" , Linux Kernel Mailing List , notify@kernel.org, ldv-project@linuxtesting.org References: <20210929185823.499268-1-alex.popov@linux.com> <20210929194924.GA880162@paulmck-ThinkPad-P17-Gen-1> <7c567acd-1cc1-a480-ca5a-d50a9c5a69ef@ispras.ru> From: Alexey Khoroshilov Autocrypt: addr=khoroshilov@ispras.ru; prefer-encrypt=mutual; keydata= xsFNBFtq9eIBEACxmOIPDht+aZvO9DGi4TwnZ1WTDnyDVz3Nnh0rlQCK8IssaT6wE5a95VWo iwOWalcL9bJMHQvw60JwZKFjt9oH2bov3xzx/JRCISQB4a4U1J/scWvPtabbB3t+VAodF5KZ vZ2gu/Q/Wa5JZ9aBH0IvNpBAAThFg1rBXKh7wNqrhsQlMLg+zTSK6ZctddNl6RyaJvAmbaTS sSeyUKXiabxHn3BR9jclXfmPLfWuayinBvW4J3vS+bOhbLxeu3MO0dUqeX/Nl8EAhvzo0I2d A0vRu/Ze1wU3EQYT6M8z3i1b3pdLjr/i+MI8Rgijs+TFRAhxRw/+0vHGTg6Pn02t0XkycxQR mhH3v0kVTvMyM7YSI7yXvd0QPxb1RX9AGmvbJu7eylzcq9Jla+/T3pOuWsJkbvbvuFKKmmYY WnAOR7vu/VNVfiy4rM0bfO14cIuEG+yvogcPuMmQGYu6ZwS9IdgZIOAkO57M/6wR0jIyfxrG FV3ietPtVcqeDVrcShKyziRLJ+Xcsg9BLdnImAqVQomYr27pyNMRL5ILuT7uOuAQPDKBksK+ l2Fws0d5iUifqnXSPuYxqgS4f8SQLS7ECxvCGVVbkEEng9vkkmyrF6wM86BZ9apPGDFbopiK 7GRxQtSGszVv83abaVb8aDsAudJIp7lLaIuXLZAe1r+ycYpEtQARAQABzSpBbGV4ZXkgS2hv cm9zaGlsb3YgPGtob3Jvc2hpbG92QGlzcHJhcy5ydT7CwX0EEwEIACcFAltq9eICGwMFCRLM AwAFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ2B/JSzCwrEWLaA/+NFZfyhU0vJzFtYsk yaqx8nWZLrAoUK7VcobH0lJH6lfGbarO5JpENaIiTP12YZ4xO+j3GGJtLy2gvnpypGnxmiAl RqPt7WeAIj6oqPrUs2QF7i4SOiPtku/NrysI1zHzlA8yqUduBtam5rdQeLRNCJiEED1fU8sp +DgJBN/OHEDyAag2hu1KFKWuPfQ+QGpXYZb+1NW/hKwvvwCNVyypELAfFnkketFXjIMwHnL8 ZPqJZlkvkpxuRXOaXPL9NFhZnC/WS+NJ81L3pr+w6eo3xTPYZvRW8glvqlEDgHqr3uMGIaes nwfRXLHp+TC1ht6efCXzdPyMZ1E7HXQN9foKisI1V5iQFhN+CT3dbsguQI4e10F5ql0TZUJY SMzvY0eObs6TWRdD/Ha7Y5rLmZ54R9sxumpZNcJzktfgm9f0XfeqVEJUn/40MRDD+l2W12Db Jkko+sbtAEw+f+/j3uz8xOE+Uv4kwFC5a6JKgdX88oigHnpAs3FvffP594Loi3ibFrQUW5wH bXh5Ni+l1GKEQ0PHMk+KQQT9L2r9s7C0Nh8XzwdpOshZWsrNSZqcG+01wrmUhyX2uSaoZ07I /+KZURlMSqI71X6lkMWlB3SyThvYhHgnR0EGGTerwM1MaVjHN+Z6lPmsKNxG8lzCeWeZ6peA c5oUHV4WQ8Ux9BM8saLOwU0EW2r14gEQAMz+5u+X7j1/dT4WLVRQaE1Shnd2dKBn2E7fgo/N 4JIY6wHD/DJoWYQpCJjjvBYSonvQsHicvDW8lPh2EXgZ9Fi8AHKT2mVPitVy+uhfWa/0FtsC e3hPfrjTcN7BUcXlIjmptxIoDbvQrNfIWUGdWiyDj4EDfABW/kagXqaBwF2HdcDaNDGggD1c DglA0APjezIyTGnGMKsi5QSSlOLm8OZEJMj5t+JL6QXrruijNb5Asmz5mpRQrak7DpGOskjK fClm/0oy2zDvWuoXJa+dm3YFr43V+c5EIMA4LpGk63Eg+5NltQ/gj0ycgD5o6reCbjLz4R9D JzBezK/KOQuNG5qKUTMbOHWaApZnZ6BDdOVflkV1V+LMo5GvIzkATNLm/7Jj6DmYmXbKoSAY BKZiJWqzNsL1AJtmJA1y5zbWX/W4CpNs8qYMYG8eTNOqunzopEhX7T0cOswcTGArZYygiwDW BuIS83QRc7udMlQg79qyMA5WqS9g9g/iodlssR9weIVoZSjfjhm5NJ3FmaKnb56h6DSvFgsH xCa4s1DGnZGSAtedj8E3ACOsEfu4J/WqXEmvMYNBdGos2YAc+g0hjuOB10BSD98d38xP1vPc qNrztIF+TODAl1dNwU4rCSdGQymsrMVFuXnHMH4G+dHvMAwWauzDbnILHAGFyJtfxVefABEB AAHCwWUEGAEIAA8FAltq9eICGwwFCRLMAwAACgkQ2B/JSzCwrEU3Rg//eFWHXqTQ5CKw4KrX kTFxdXnYKJ5zZB0EzqU6m/FAV7snmygFLbOXYlcMW2Fh306ivj9NKJrlOaPbUzzyDf8dtDAg nSbH156oNJ9NHkz0mrxFMpJA2E5AUemOFx57PUYt93pR2B7bF2zGua4gMC+vorDQZjX9kvrL Kbenh3boFOe1tUaiRRvEltVFLOg+b+CMkKVbLIQe/HkyKJH5MFiHAF7QxnPHaxyO7QbWaUmF 6BHVujxAGvNgkrYJb6dpiNNZSFNRodaSToU5oM+z1dCrNNtN3u4R7AYr6DDIDxoSzR4k0ZaG uSeqh4xxQCD7vLT3JdZDyhYUJgy9mvSXdkXGdBIhVmeLch2gaWNf5UOutVJwdPbIaUDRjVoV Iw6qjKq+mnK3ttuxW5Aeg9Y1OuKEvCVu+U/iEEJxx1JRmVAYq848YqtVPY9DkZdBT4E9dHqO n8lr+XPVyMN6SBXkaR5tB6zSkSDrIw+9uv1LN7QIri43fLqhM950ltlveROEdLL1bI30lYO5 J07KmxgOjrvY8X9WOC3O0k/nFpBbbsM4zUrmF6F5wIYO99xafQOlfpUnVtbo3GnBR2LIcPYj SyY3dW28JXo2cftxIOr1edJ+fhcRqYRrPzJrQBZcE2GZjRO8tz6IOMAsc+WMtVfj5grgVHCu kK2E04Fb+Zk1eJvHYRc= Message-ID: <64be87a7-bb1f-5578-a526-b7d064fcfea3@ispras.ru> Date: Wed, 27 Jul 2022 20:47:41 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27.07.2022 19:42, Linus Torvalds wrote: > On Wed, Jul 27, 2022 at 9:17 AM Alexey Khoroshilov > wrote: >> >> We see a number of cases where WARNING is used to inform userspace that >> it is doing something wrong, e.g. >> https://elixir.bootlin.com/linux/v5.19-rc8/source/net/can/j1939/socket.c#L181 >> https://elixir.bootlin.com/linux/v5.19-rc8/source/drivers/video/fbdev/core/fbmem.c#L1023 > > That first case is entirely bogus. > > WARN_ON() should only be used for "This cannot happen, but if it does, > I want to know how we got here". > > But the second case is fine: Using "pr_warn()" is fine. A kernel > warning (without a backtrace) is a normal thing for something that is > deprecated or questionable, and you want to tell the user that "this > app is doing something wrong". Agree with the only note that I like the requirement: * Do not include "BUG"/"WARNING" in format strings manually to make * these conditions distinguishable from kernel issues. very much. Thank you, Alexey