Received: by 2002:a25:6193:0:0:0:0:0 with SMTP id v141csp3951318ybb; Mon, 6 Apr 2020 20:14:20 -0700 (PDT) X-Google-Smtp-Source: APiQypIgY1A+CKxpD99v+ZlT5J6bUv5diZL/ngSUz1rtPmLaYD1TwHnoNafYfchkA/nq/VW9xDeX X-Received: by 2002:aca:d553:: with SMTP id m80mr212840oig.30.1586229260058; Mon, 06 Apr 2020 20:14:20 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1586229260; cv=none; d=google.com; s=arc-20160816; b=gCmRKFDNHE1m+Op1kE/YmgnM3xuhq+5njS4nhSCp+hvnXaFIUKZwon8mQZH9KryI2T JLErSADwCw1XAj1BKQEqCsyULnlk5/ueIxcfLk/lCdQ4un9mGtpHdiGXBsGrCz0u3orY FWZRhgdaVir49fZ++ir0gzgJem6C6oseGO3ehLR4403ivTsJs/dOdVDbEemI6lOwrLfH P1keRvGRI4db+0Kfg4DPh1nCGyiaWApyai4PqMyQdQvBzLwrvLBRehwiluyI34CrYfiJ sWVfRvr1B8bWLnc3Rht9AxIoSLRPvukkS/8qWF2+T71YbG+PN7olptYCKqMGvZu7tyk1 n7ow== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date; bh=Vm+26OUcXKnrFznvoUFUPk8zA59NWGtGgOnhbO8p2M0=; b=oZezxf2CrgC9jOdnlOs0j3P17zcu4yyHG/Zih4UhYqcIdilAJf1jM7hcXOPVMZGwly z/h1gmzb0b3ztL/VflZFHWhl+HhsmABomDFxnp2aEUIygie0IS6Hpu5Ztl7oYXS4kVL0 IMbJeW4Srwg2JP5tBEBRNAbceHJpfN94KeI1WtBaBnEgh3x/UigkYrW5uc2eskZATSd4 osaJxkLAPx+QSXOdijKl22a+ajjQKoCWSuw/d+5C1v9wshvAhJq7lYs/dLy5+eOc1NXn cgDlZOGJqHtdlZZu6Qb0vkfq+eZWfO1zNfXuprU9dxqyAvSVlcgrMF2xmJn+ZxqSiJQL RF9A== ARC-Authentication-Results: i=1; mx.google.com; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u7si670652oou.82.2020.04.06.20.14.07; Mon, 06 Apr 2020 20:14:20 -0700 (PDT) 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; 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 S1726718AbgDGDNb (ORCPT + 99 others); Mon, 6 Apr 2020 23:13:31 -0400 Received: from zeniv.linux.org.uk ([195.92.253.2]:35410 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726535AbgDGDNa (ORCPT ); Mon, 6 Apr 2020 23:13:30 -0400 Received: from viro by ZenIV.linux.org.uk with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jLefu-00CjN9-CV; Tue, 07 Apr 2020 03:13:18 +0000 Date: Tue, 7 Apr 2020 04:13:18 +0100 From: Al Viro To: Levi Cc: davem@davemloft.net, kuba@kernel.org, gnault@redhat.com, nicolas.dichtel@6wind.com, edumazet@google.com, lirongqing@baidu.com, tglx@linutronix.de, johannes.berg@intel.com, dhowells@redhat.com, daniel@iogearbox.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] netns: dangling pointer on netns bind mount point. Message-ID: <20200407031318.GY23230@ZenIV.linux.org.uk> References: <20200407023512.GA25005@ubuntu> <20200407030504.GX23230@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200407030504.GX23230@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 07, 2020 at 04:05:04AM +0100, Al Viro wrote: > Could you post a reproducer, preferably one that would trigger an oops > on mainline? BTW, just to make sure - are we talking about analysis of existing oops, or is it "never seen it happen, but looks like it should be triggerable" kind of situation?