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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 54175C4332F for ; Tue, 7 Nov 2023 09:26:35 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r0ILn-0000y0-6V; Tue, 07 Nov 2023 04:26:23 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r0ILl-0000vi-4V; Tue, 07 Nov 2023 04:26:21 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r0ILj-0002My-1V; Tue, 07 Nov 2023 04:26:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=p1TSQVpF6nzxSHBwLx4pIvUfIfh/fenhfieJnDJPWA4=; b=AAr2xYyuXFBK+ykK2iWZuwyM5e HbJuHIHRVDl6UBzpig0yliSoneIHfqc2nOfXCIu06fXUb0ML6PqUQ5+CzDrSAb2biGnKtnr10/Nv4 5eAKbZrNIyByDKuAIZm4ezutVREDJbZ3Z+4yzz4T4RpZK/JWOz6kRlVGsVIXIglBMw/I9NnOblOfI LiGG/6cp9eBeSQXLgoZCb56cQQ15tuFhrEu5J7wSx4JWINY+2EyaIA3nCErjWuuh31lPyiU8Qqy+E bdG6CV6rFn2zpO/kaGy5MkjGHQXiHi/vOi5n2YVjR80/mq08KAl3STcOgYU/y3M/FAeoWVAvBLn+s 6xibzNEQ==; Received: from [2001:8b0:10b:5:63c4:8578:30dc:d79e] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r0ILg-00BSPT-P5; Tue, 07 Nov 2023 09:26:17 +0000 Message-ID: <797ea680eacd0012906aae89fd5cf94395d7b8cb.camel@infradead.org> Subject: Re: [PATCH v4 14/17] net: do not delete nics in net_cleanup() From: David Woodhouse To: qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Peter Maydell , Stefano Stabellini , Anthony Perard , Paul Durrant , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Jason Wang , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org Date: Tue, 07 Nov 2023 09:26:16 +0000 In-Reply-To: <20231106143507.1060610-15-dwmw2@infradead.org> References: <20231106143507.1060610-1-dwmw2@infradead.org> <20231106143507.1060610-15-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-fGWDpuQzN13l32rL7klP" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+0fd401c0b30749933da3+7380+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-fGWDpuQzN13l32rL7klP Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2023-11-06 at 14:35 +0000, David Woodhouse wrote: > From: David Woodhouse >=20 > In net_cleanup() we only need to delete the netdevs, as those may have > state which outlives Qemu when it exits, and thus may actually need to > be cleaned up on exit. >=20 > The nics, on the other hand, are owned by the device which created them. > Most devices don't bother to clean up on exit because they don't have > any state which will outlive Qemu... but XenBus devices do need to clean > up their nodes in XenStore, and do have an exit handler to delete them. >=20 > When the XenBus exit handler destroys the xen-net-device, it attempts > to delete its nic after net_cleanup() had already done so. And crashes. >=20 > Fix this by only deleting netdevs as we walk the list. As the comment > notes, we can't use QTAILQ_FOREACH_SAFE() as each deletion may remove > *multiple* entries, including the "safely" saved 'next' pointer. But > we can store the *previous* entry, since nics are safe. >=20 > Signed-off-by: David Woodhouse > Reviewed-by: Paul Durrant I've left this out of the pull request I've just sent, pending Jason's approval for it. As it's a bugfix, I don't think we strictly has to be in by *today*, right? 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