Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753006Ab3CUUgo (ORCPT ); Thu, 21 Mar 2013 16:36:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38003 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752856Ab3CUUgn (ORCPT ); Thu, 21 Mar 2013 16:36:43 -0400 Date: Thu, 21 Mar 2013 16:36:39 -0400 From: Dave Jones To: Linus Torvalds Cc: Al Viro , Linux Kernel Subject: Re: VFS deadlock ? Message-ID: <20130321203639.GC16406@redhat.com> Mail-Followup-To: Dave Jones , Linus Torvalds , Al Viro , Linux Kernel References: <20130321190653.GA15479@redhat.com> <20130321192935.GY21522@ZenIV.linux.org.uk> <20130321202635.GA16406@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1626 Lines: 38 On Thu, Mar 21, 2013 at 01:32:45PM -0700, Linus Torvalds wrote: > On Thu, Mar 21, 2013 at 1:26 PM, Dave Jones wrote: > > > > those are qstr's, so I used d_name.name, right ? > > Yup. And if you want to, you could do p1->d_parent->d_name.name too, > just to make things obvious. It's technically racy, but by the time > the bug happens, who cares? I'll add that next time around if the current run doesn't turn up anything interesting. > > I'd be surprised actually, I've got sysfs excluded from its list of victim files, > > due to unrelated issues still unresolved. So unless it followed a symlink into > > sys from somewhere in /proc or /dev... > > > > It took a few hours to reproduce last time, I'll increase the number of child > > processes to see if I can trigger it faster now that I have the debug stuff in there. > > Hmm, ok. Do you have any network mounts or fuse or other "odd" > filesystems etc? The whole "aliased inodes" thing might come from > something like that. at some point during the fuzz run, this happened.. Mar 20 15:20:41 kernel: [ 7578.784674] fuse init (API version 7.21) Mar 20 15:20:41 systemd[1]: Mounting FUSE Control File System... Mar 20 15:20:41 systemd[1]: Mounted FUSE Control File System. I guess something wandered into /dev/fuse and did something. Not sure why systemd reacted though... Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/