Received: by 2002:a05:7412:da14:b0:e2:908c:2ebd with SMTP id fe20csp1913228rdb; Mon, 9 Oct 2023 07:00:52 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF9iPhf1YKlFfIyfgzDAsVfQI80VO/+r2pkDTTlrQElw86l0rjOW/FbA3bLfDIbRI64hctz X-Received: by 2002:a17:902:680e:b0:1bb:fcb9:f85 with SMTP id h14-20020a170902680e00b001bbfcb90f85mr12359494plk.32.1696860051998; Mon, 09 Oct 2023 07:00:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1696860051; cv=none; d=google.com; s=arc-20160816; b=AoEgklkvNoRgaTvKi3iu6NWFYb9yKk/67shCX76tQ3Jvu3U44M4BHNhSqLU2TRFqOm Dqy/alJ0WcEzN5oapclMZuimSVyWDfvuLiVuLvt5j8cCYvPf7PG1dLvN+o11cySduge/ WNuDpeoeBjUDXK/lkbfRBnBw5+RFMTPL8fBs8zrzdUV2aZV31O7Spu+1bcwkypZNoflW GyjiM2qBI5nxKcnDz5fein76xQZIet9UAw5W6xXWPFrASS9BnJOz2S8ZUAOUquKhZ+Va qh5nrUU/Uj011XxkcIqsV/wt56MkQr24nyPZ4XApLXFHxymv0bY504oXfA1pcSVQHBZQ 8irg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=JF7OTsbUXAnNoySM8+FMhLBG+tpEPoUNABuCu8th51M=; fh=ceZda6yNAvV0yPXqLvMinluUq7IHYhnrUEzKaWMgfVE=; b=C3sH+8MBd+ixrZi3OAZms98W7TEjogpNN0uCQvCQozYhFkf2xY6G67PnA2vyDxSY2F 9IWMqqn9eKoJpfg5wyCXTX9rp6rHQqdv6AD0pRmSwm2IJA3USL9q3RQ3iIhuv8d7nSEI u9b+Q6XpI0c1EGF73UNtb47VDYSELFRAK1qaTjLkOvaarZEu08R+E4mRJu+ey0n8ynLD e9fJLWmqLMjxO4xm37vdO5GwuHK08aNp65ULMLA6iVSPdX8rkYHfJPuauHNF4htLcJxe KLD9J/kRbq51H5IFAwmY9gMJXj6GEMgHaAl2FtnbDrbc3YVlSuthFQRRZ70pjuXQFyxw sPBg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from pete.vger.email (pete.vger.email. [2620:137:e000::3:6]) by mx.google.com with ESMTPS id ks14-20020a170903084e00b001b801044467si9057475plb.3.2023.10.09.07.00.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Oct 2023 07:00:51 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) client-ip=2620:137:e000::3:6; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:6 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by pete.vger.email (Postfix) with ESMTP id CDCAA805DEF5; Mon, 9 Oct 2023 07:00:48 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at pete.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376856AbjJIOAk (ORCPT + 99 others); Mon, 9 Oct 2023 10:00:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376693AbjJIOAj (ORCPT ); Mon, 9 Oct 2023 10:00:39 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A77249C for ; Mon, 9 Oct 2023 07:00:38 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 33379C433C8; Mon, 9 Oct 2023 14:00:37 +0000 (UTC) Date: Mon, 9 Oct 2023 10:01:55 -0400 From: Steven Rostedt To: Joel Fernandes Cc: "Eric W. Biederman" , linux-kernel@vger.kernel.org, Ricardo Ribalda , Ross Zwisler , Rob Clark , Linus Torvalds , kexec@lists.infradead.org Subject: Re: [PATCH] kexec: Fix reboot race during device_shutdown() Message-ID: <20231009100155.6d71490f@gandalf.local.home> In-Reply-To: References: <20230929021213.2364883-1-joel@joelfernandes.org> <87bkdl55qm.fsf@email.froward.int.ebiederm.org> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=2.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Mon, 09 Oct 2023 07:00:49 -0700 (PDT) X-Spam-Level: ** On Sat, 7 Oct 2023 21:30:42 -0400 Joel Fernandes wrote: > Just checking how we want to proceed, is the consensus that we should > prevent kernel crashes without relying on userspace stopping all > processes? Should we fix regular reboot syscall as well and not just > kexec reboot? If you can show that we can trigger the crash on normal reboot, then I don't see why not. That is, if you have a program that does the reboot (without the SIGSTOP/SIGKILL calls) and triggers this crash, I think that's a legitimate reason to fix it on normal reboot too. -- Steve