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 9E5F2C433F5 for ; Wed, 23 Mar 2022 14:24:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244741AbiCWOZh (ORCPT ); Wed, 23 Mar 2022 10:25:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237165AbiCWOZe (ORCPT ); Wed, 23 Mar 2022 10:25:34 -0400 Received: from gateway33.websitewelcome.com (gateway33.websitewelcome.com [192.185.146.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B4B21DEDF for ; Wed, 23 Mar 2022 07:24:04 -0700 (PDT) Received: from cm12.websitewelcome.com (cm12.websitewelcome.com [100.42.49.8]) by gateway33.websitewelcome.com (Postfix) with ESMTP id 5881A944E for ; Wed, 23 Mar 2022 09:24:01 -0500 (CDT) Received: from 162-215-252-75.unifiedlayer.com ([208.91.199.152]) by cmsmtp with SMTP id X1u5nnhAg9AGSX1u5niYqR; Wed, 23 Mar 2022 09:24:01 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=roeck-us.net; s=default; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:Subject:From:References:Cc:To:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=id4KakR43VwvSclTscrtuuJMK1IX+RuWRI/B9xFRJpk=; b=SVzwFj19iwEqII6is3hOB116dH +gBfETPclRjBnoEvnRrOoeW+sDTr+HJAtSYVUX8gptsIpITfOUg1cFuME2dcm3P5UMk415bAELP/q feklv8fsUk4sIh/rzmueB+y6EwGWnCT8cYq9MBPTPnF+K6XqVjwm20bzbyvaGgIARVK331DUeq7vB iKjDb2KIwYx0QExPQA1aDN8T9L8/ZY9tOlyI2WV8vMP8YqAcjUROIvSlWeFIoFUome6eiJCc1+sNL HC35XPU2SmqRcuAwhX0a9ZQNFnMOgeqdHQUFBTz4nCq7XF7OxOzzMW6Uk8Q4rdd1dU0F/DaKDZhG1 0UL+lFyA==; Received: from 108-223-40-66.lightspeed.sntcca.sbcglobal.net ([108.223.40.66]:54412) by bh-25.webhostbox.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1nX1u3-002CJg-TF; Wed, 23 Mar 2022 14:23:59 +0000 Message-ID: Date: Wed, 23 Mar 2022 07:23:56 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Content-Language: en-US To: Mark Brown Cc: "Jason A. Donenfeld" , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-arch@vger.kernel.org, Dinh Nguyen , Nick Hu , Max Filippov , Palmer Dabbelt , "David S . Miller" , Yoshinori Sato , Michal Simek , Borislav Petkov , Guo Ren , Geert Uytterhoeven , Joshua Kinard , David Laight , Dominik Brodowski , Eric Biggers , Ard Biesheuvel , Arnd Bergmann , Thomas Gleixner , Andy Lutomirski , Kees Cook , Lennart Poettering , Konstantin Ryabitsev , Linus Torvalds , Greg Kroah-Hartman , Theodore Ts'o References: <20220217162848.303601-1-Jason@zx2c4.com> <20220322155820.GA1745955@roeck-us.net> <0d20fb04-81b8-eeee-49ab-5b0a9e78c9f8@roeck-us.net> From: Guenter Roeck Subject: Re: [PATCH v1] random: block in /dev/urandom In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-BWhitelist: no X-Source-IP: 108.223.40.66 X-Source-L: No X-Exim-ID: 1nX1u3-002CJg-TF X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 108-223-40-66.lightspeed.sntcca.sbcglobal.net [108.223.40.66]:54412 X-Source-Auth: linux@roeck-us.net X-Email-Count: 27 X-Source-Cap: cm9lY2s7YWN0aXZzdG07YmgtMjUud2ViaG9zdGJveC5uZXQ= X-Local-Domain: yes Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/23/22 05:10, Mark Brown wrote: > On Tue, Mar 22, 2022 at 02:54:20PM -0700, Guenter Roeck wrote: >> On 3/22/22 11:24, Mark Brown wrote: > >>> Just as a datapoint for debugging at least qemu/arm is getting coverage >>> in CI systems (KernelCI is covering a bunch of different emulated >>> machines and LKFT has at least one configuration as well, clang's tests >>> have some wider architecture coverage as well I think) and they don't >>> seem to be seeing any problems - there's some other variable in there. > >> I use buildroot 2021.02.3. I have not changed the buildroot code, and it >> still seems to be the same in 2022.02. I don't see the problem with all >> boot tests, only with the architectures mentioned above, and not with all >> qemu machines on the affected platforms. For arm, mostly older machines >> are affected (versatile, realview, pxa configurations, collie, integratorcp, >> sx1, mps2-an385, vexpress-a9, cubieboard). I didn't check, but maybe >> kernelci doesn't test those machines ? > > Kind of academic given that Jason seems to have a handle on what the > issues are but for KernelCI it's variations on mach-virt, plus > versatile-pb. There's a physical cubietruck as well, and BeagleBone > Blacks among others. My best guess would be systems with low RAM are > somehow more prone to issues. I don't think it is entirely academic. versatile-pb fails for me; if it doesn't fail at KernelCI, I'd like to understand why - not to fix it in my test environment, but to make sure that I _don't_ fix it. After all, it _is_ a regression. Even if that regression is triggered by bad (for a given definition of "bad") userspace code, it is still a regression. Thanks, Guenter