From: Dmitry Gutov <raaahh@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 13149@debbugs.gnu.org, eggert@cs.ucla.edu
Subject: bug#13149: 24.3.50; Emacs thinks file was changed outside Emacs, but it was not
Date: Fri, 18 Jan 2013 08:15:43 +0400 [thread overview]
Message-ID: <50F8CC6F.7000106@gmail.com> (raw)
In-Reply-To: <83txqf7n9o.fsf@gnu.org>
On 17.01.2013 21:05, Eli Zaretskii wrote:
>> Date: Thu, 17 Jan 2013 14:32:56 +0400
>> From: Dmitry Gutov <raaahh@gmail.com>
>> CC: 13149@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
>>
>> Looked at the VirtualBox bug reports, found just this one:
>> https://www.virtualbox.org/ticket/10986, not much information there.
>>
>> Some more about space rays:
>> 1) I now have a version of Emacs compiled on a brand-new Fedora virtual
>> machine from emacs-24 branch (revno 111185) that exhibits the problem.
>> Just tested it simultaneously with Ubuntu, emacs-24 on Fedora is buggy,
>> Ubuntu's is not. The following items (2 and 3) are from a few hours ago,
>> when I tested Fedora machine exclusively.
>> 2) Editing the file on a different disk on the host system (HDD vs SSD)
>> makes no difference, the bug is present.
>> 3) Process Monitor doesn't show any other processes accessing the file
>> on the host machine other than VirtualBox.exe, SYSTEM and
>> SearchProtocolHost.exe. The last one goes away if I stop the Windows
>> Search service, but the problem stays.
>
> I suspect that what you see is some bad interaction between VirtualBox
> and the nasty way Windows disk cache optimizes its disk I/O. It is
> known to update the file attributes lazily, so data could be written
> to a file without the file's directory entry updated at the same time,
> until some time later.
I wonder why I don't see that with the straight Windows build editing
files on the local filesystem. Does it forcibly disable some optimizations?
>> I'm attaching the exported event log for the open-modify-save
>> scenario (file-access-log.csv) in case someone knowledgeable can see
>> anything weird there (Eli?).
>
> I don't see anything interesting there, although I cannot pretend that
> I've studied every single entry.
Oh well. It was worth a try.
next prev parent reply other threads:[~2013-01-18 4:15 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-11 21:51 bug#13149: 24.3.50; Emacs thinks file was changed outside Emacs, but it was not Drew Adams
2012-12-11 22:48 ` Dmitry Gutov
2012-12-11 22:54 ` Drew Adams
2013-01-14 5:10 ` Dmitry Gutov
2013-01-14 14:57 ` Dmitry Gutov
2013-01-14 17:02 ` Eli Zaretskii
2013-01-14 22:22 ` Dmitry Gutov
2013-01-14 18:28 ` Paul Eggert
2013-01-14 22:20 ` Dmitry Gutov
2013-01-15 6:45 ` Paul Eggert
2013-01-15 8:54 ` Dmitry Gutov
2013-01-15 17:31 ` Paul Eggert
2013-01-15 21:38 ` Dmitry Gutov
2013-01-15 21:47 ` Paul Eggert
2013-01-15 22:11 ` Dmitry Gutov
2013-01-15 22:38 ` Paul Eggert
2013-01-15 23:09 ` Dmitry Gutov
2013-01-15 23:44 ` Dmitry Gutov
2013-01-16 5:57 ` Paul Eggert
2013-01-17 10:32 ` Dmitry Gutov
2013-01-17 17:05 ` Eli Zaretskii
2013-01-18 4:15 ` Dmitry Gutov [this message]
2013-01-18 7:49 ` Eli Zaretskii
2013-01-17 21:14 ` Paul Eggert
2013-01-18 4:55 ` Dmitry Gutov
2013-01-18 5:26 ` Paul Eggert
2013-01-17 21:33 ` Paul Eggert
2013-01-18 4:36 ` Dmitry Gutov
2013-01-18 5:01 ` Paul Eggert
2013-01-18 5:10 ` Dmitry Gutov
2013-01-18 5:25 ` Paul Eggert
2013-01-18 5:54 ` Dmitry Gutov
2013-01-18 6:22 ` Dmitry Gutov
2013-01-18 7:56 ` Eli Zaretskii
2013-01-18 14:45 ` Dmitry Gutov
2013-01-18 21:35 ` Paul Eggert
2013-01-18 22:52 ` Dmitry Gutov
2013-01-19 0:55 ` Paul Eggert
2013-01-19 1:09 ` Dmitry Gutov
2013-01-19 2:37 ` Paul Eggert
2013-01-19 4:02 ` Dmitry Gutov
2013-01-19 4:51 ` Paul Eggert
[not found] ` <DEB91990BBBB4255BFB466956EB54214@us.oracl! e.com>
[not found] ` <DEB91990BBBB4255BFB466956EB54214@us.oracl!>
[not found] ` <e.com@[87.69.4.28]>
[not found] ` <83wq! urc1u3.fsf@gnu.org>
[not found] ` <DEB91990BBBB4255BFB466956! EB54214@us.oracl!>
[not found] ` <DEB91990BBBB4255BFB466956EB54214@us.oracl!e.com>
2013-01-19 5:02 ` Drew Adams
2013-02-01 16:32 ` Drew Adams
2013-02-01 16:43 ` Drew Adams
2013-02-01 16:49 ` Drew Adams
2013-02-01 18:43 ` Eli Zaretskii
2013-02-01 19:19 ` Drew Adams
2013-02-01 19:36 ` Eli Zaretskii
2013-02-01 22:15 ` Drew Adams
2013-02-02 9:41 ` Eli Zaretskii
2013-02-02 16:06 ` Drew Adams
2013-02-01 19:38 ` Eli Zaretskii
2013-02-01 22:13 ` Drew Adams
2013-02-01 21:05 ` Paul Eggert
2013-02-01 22:14 ` Drew Adams
2013-02-01 22:22 ` Paul Eggert
2013-02-02 9:43 ` Eli Zaretskii
2013-03-19 8:39 ` Uwe Siart
2013-03-19 16:55 ` Eli Zaretskii
2013-03-19 17:50 ` Uwe Siart
2014-02-06 1:40 ` Lars Ingebrigtsen
2014-02-06 6:12 ` Drew Adams
2014-02-06 6:19 ` Eli Zaretskii
2013-02-02 9:38 ` Eli Zaretskii
2013-02-02 19:31 ` Paul Eggert
2013-01-18 7:57 ` Eli Zaretskii
2013-01-17 17:16 ` David Engster
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=50F8CC6F.7000106@gmail.com \
--to=raaahh@gmail.com \
--cc=13149@debbugs.gnu.org \
--cc=eggert@cs.ucla.edu \
--cc=eliz@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).