From: Hugh Dickins Subject: Re: Apparent serious progressive ext4 data corruption bug in 3.6.3 (and other stable branches?) Date: Wed, 24 Oct 2012 00:00:46 -0700 (PDT) Message-ID: References: <87objupjlr.fsf@spindle.srvr.nix> <20121023013343.GB6370@fieldses.org> <87mwzdnuww.fsf@spindle.srvr.nix> <20121023143019.GA3040@fieldses.org> <874nllxi7e.fsf_-_@spindle.srvr.nix> <87pq48nbyz.fsf_-_@spindle.srvr.nix> <508740B2.2030401@redhat.com> <87txtkld4h.fsf@spindle.srvr.nix> <50876E1D.3040501@redhat.com> <20121024052351.GB21714@thunk.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Eric Sandeen , Nix , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, "J. Bruce Fields" , Bryan Schumaker , Peng Tao , Trond.Myklebust@netapp.com, gregkh@linuxfoundation.org, =?ISO-8859-15?Q?Toralf_F=F6rster?= To: Theodore Ts'o Return-path: Received: from mail-ie0-f174.google.com ([209.85.223.174]:48814 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933661Ab2JXHAx (ORCPT ); Wed, 24 Oct 2012 03:00:53 -0400 Received: by mail-ie0-f174.google.com with SMTP id k13so227975iea.19 for ; Wed, 24 Oct 2012 00:00:53 -0700 (PDT) In-Reply-To: <20121024052351.GB21714@thunk.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Wed, 24 Oct 2012, Theodore Ts'o wrote: > Journal flushes outside of an unmount does > happen as part of online resizing, the FIBMAP ioctl, or when the file > system is frozen. But it didn't sound like Toralf or Nix was using > any of those features. (Toralf, Nix, please correct me if my > assumptions here is wrong). I believe it also happens at swapon of a swapfile on the filesystem. Hugh