From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:39284 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725139AbeJSELr (ORCPT ); Fri, 19 Oct 2018 00:11:47 -0400 From: David Howells In-Reply-To: <862e36a2-2a6f-4e26-3228-8cab4b4cf230@gmail.com> References: <862e36a2-2a6f-4e26-3228-8cab4b4cf230@gmail.com> <153754740781.17872.7869536526927736855.stgit@warthog.procyon.org.uk> <153754743491.17872.12115848333103740766.stgit@warthog.procyon.org.uk> To: Alan Jenkins Cc: dhowells@redhat.com, viro@zeniv.linux.org.uk, torvalds@linux-foundation.org, ebiederm@xmission.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, mszeredi@redhat.com Subject: Re: [PATCH 03/34] teach move_mount(2) to work with OPEN_TREE_CLONE [ver #12] MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Date: Thu, 18 Oct 2018 21:09:07 +0100 Message-ID: <7833.1539893347@warthog.procyon.org.uk> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Alan Jenkins wrote: > If I instead do the mount+unmount first, and close the FD as a second step, I > think there's a lockup in the close().  The lockup happens in the same place > as the unmount lockup from before. (Except there's a line "Code: Bad RIP > value", I don't know why that happens). Sorry, which FD are we talking about? I presume you're talking about a command sequence like this: # unshare --mount # test-fsmount # mount --move . /mnt # mount --move /mnt /mnt # cd # umount /mnt # exit but this fails on your modified test-fsmount with: shell-init: error retrieving current directory: getcwd: cannot access parent directories: No such file or directory David