From: Andrey Borzenkov <arvidjaar@mail.ru>
To: Diego Calleja <grundig@teleline.es>, Ian Kent <raven@themaw.net>
Cc: greg@kroah.com, linux-kernel@vger.kernel.org
Subject: Re: udev and devfs - The final word
Date: Thu, 8 Jan 2004 22:25:01 +0300 [thread overview]
Message-ID: <200401082220.24127.arvidjaar@mail.ru> (raw)
In-Reply-To: <20040108182621.1278db90.grundig@teleline.es>
On Thursday 08 January 2004 20:26, Diego Calleja wrote:
> El Thu, 8 Jan 2004 23:40:16 +0800 (WST) Ian Kent <raven@themaw.net>
escribió:
> > Again I'm also unable to find descriptions of the 'unsolvable' races.
> >
> > I wouldn't mind knowing what they are either. Anyone?
>
> You can find tons of examples (several of them patches by Al Viro to fix
> them) by searching with google with keywords like "devfs races". The
> "should fix" list
> (http://www.kernel.org/pub/linux/kernel/people/akpm/must-fix) has this:
>
is it a gospel?
> hch: devfs: there's a fundamental lookup vs devfsd race that's only
> fixable by introducing a lookup vs devfs deadlock. I can't see how this
> is fixable without getting rid of the current devfsd design. Mandrake
> seems to have a workaround for this so this is at least not triggered so
> easily, but that's not what I'd consider a fix..
oh, well ... if you selected this example ...
Mandrake workaround it mentions was my first attempt to fix this; this did not
fix the devfs but rather fixed the user-space program that provoked this on
boot (and that was buggy irrespectively of this problem).
Current 2.6 kernel includes my fix to deadlock condition. Current -mm includes
one possible fix for race condition; Andrew Morton mentioned that it is
unlikely to be accepted due to minor changes in VFS layer; I am working on
another less intrusive fix and overall devfs cleanup.
Would you please instead of citing long obsolete paper show me real example
and explain *why* it is not fixable. Better yet, would you take some time to
try to provoke any of those huge races and report back your success (stack
trace and instructions how to reproduce them are welcome :)
Thank you
-andrey
next prev parent reply other threads:[~2004-01-08 19:38 UTC|newest]
Thread overview: 177+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-08 13:53 udev and devfs - The final word "Andrey Borzenkov"
2004-01-08 15:40 ` Ian Kent
2004-01-08 17:26 ` Diego Calleja
2004-01-08 19:25 ` Andrey Borzenkov [this message]
2004-01-08 22:40 ` Alex Goddard
2004-01-09 7:03 ` "Andrey Borzenkov"
2004-01-08 18:14 ` Alex Goddard
2004-01-08 18:35 ` Alex Goddard
2004-01-08 19:22 ` Andrey Borzenkov
2004-01-09 8:51 ` Helge Hafting
-- strict thread matches above, loose matches on Subject: below --
2004-01-08 13:05 "Andrey Borzenkov"
2004-01-06 1:20 Paul Zimmerman
[not found] <fa.flhsork.uka2hg@ifi.uio.no>
[not found] ` <fa.hv9hpq7.1l1q9p3@ifi.uio.no>
2004-01-01 19:53 ` walt
2004-01-01 21:53 ` Martin Schlemmer
2004-01-01 16:59 Shaheed
[not found] <fa.af64864.ugabhg@ifi.uio.no>
[not found] ` <fa.de7jae9.1jk0pjt@ifi.uio.no>
2003-12-31 22:17 ` walt
2004-01-01 2:03 ` Martin Schlemmer
2004-01-01 2:05 ` Martin Schlemmer
[not found] <18Cz7-7Ep-7@gated-at.bofh.it>
2003-12-31 3:05 ` Pascal Schmidt
2003-12-31 19:23 ` Greg KH
2003-12-31 20:19 ` Rob Love
2003-12-31 22:01 ` Nathan Conrad
2003-12-31 22:20 ` Rob Love
2003-12-31 21:45 ` Tommi Virtanen
2003-12-31 23:10 ` Rob Love
2003-12-31 21:52 ` Tommi Virtanen
2004-01-02 0:17 ` Hollis Blanchard
2004-01-02 0:36 ` viro
2004-01-03 6:04 ` Greg KH
2003-12-31 22:55 ` viro
2003-12-31 23:05 ` Rob Love
2003-12-31 23:48 ` Andreas Dilger
2004-01-07 10:15 ` Olaf Hering
2004-01-07 11:18 ` viro
2004-01-07 13:00 ` Olaf Hering
2004-01-07 13:26 ` viro
2004-01-07 13:27 ` Olaf Hering
2004-01-01 0:15 ` Andries Brouwer
2004-01-01 0:31 ` Rob Love
2004-01-01 12:34 ` Rob Landley
2004-01-01 15:22 ` Rob Love
2004-01-01 15:48 ` Andries Brouwer
2004-01-01 15:54 ` Rob Love
2004-01-02 20:42 ` Linus Torvalds
2004-01-03 3:00 ` Andries Brouwer
2004-01-03 4:46 ` Linus Torvalds
2004-01-03 13:10 ` Andries Brouwer
2004-01-03 22:27 ` Linus Torvalds
2004-01-03 23:08 ` Andries Brouwer
2004-01-04 1:16 ` Mark Mielke
2004-01-04 1:54 ` Valdis.Kletnieks
2004-01-04 18:44 ` Mark Mielke
2004-01-04 2:09 ` Linus Torvalds
2004-01-04 2:49 ` Andries Brouwer
2004-01-04 3:04 ` Linus Torvalds
2004-01-04 13:21 ` Andries Brouwer
2004-01-04 21:05 ` Linus Torvalds
2004-01-04 22:01 ` Andries Brouwer
2004-01-04 22:37 ` viro
2004-01-05 1:02 ` Mark Mielke
2004-01-05 2:24 ` Valdis.Kletnieks
2004-01-05 2:29 ` Andries Brouwer
2004-01-05 3:42 ` viro
2004-01-04 22:37 ` Helge Hafting
2004-01-04 23:35 ` Valdis.Kletnieks
2004-01-05 1:43 ` Jeremy Maitin-Shepard
2004-01-05 1:58 ` viro
2004-01-05 2:12 ` Jeremy Maitin-Shepard
2004-01-05 2:52 ` Linus Torvalds
2004-01-05 3:06 ` David Lang
2004-01-05 3:48 ` Rob Landley
2004-01-05 4:52 ` Trond Myklebust
2004-01-05 15:13 ` Mark Mielke
2004-01-05 16:36 ` Andreas Schwab
2004-01-05 22:18 ` Mark Mielke
2004-01-05 3:07 ` Daniel Jacobowitz
2004-01-05 3:33 ` Linus Torvalds
2004-01-05 3:50 ` viro
2004-01-05 4:02 ` Linus Torvalds
2004-01-05 4:38 ` viro
2004-01-05 4:52 ` Linus Torvalds
2004-01-05 6:11 ` viro
2004-01-05 7:47 ` Greg KH
2004-01-05 11:15 ` Vojtech Pavlik
2004-01-05 20:11 ` Theodore Ts'o
2004-01-05 21:06 ` Vojtech Pavlik
2004-01-05 22:22 ` Theodore Ts'o
2004-01-06 0:14 ` Rob Landley
2004-01-11 22:12 ` Ed L Cashin
2004-01-05 5:26 ` Eric W. Biederman
2004-01-05 7:39 ` Greg KH
2004-01-07 9:57 ` Pavel Machek
2004-01-05 12:27 ` Andries Brouwer
2004-01-05 16:13 ` Linus Torvalds
2004-01-05 17:29 ` Vojtech Pavlik
2004-01-05 17:33 ` Linus Torvalds
2004-01-05 17:52 ` Davide Libenzi
2004-01-05 18:03 ` Linus Torvalds
2004-01-05 18:09 ` Hugo Mills
2004-01-05 19:10 ` Paul Rolland
2004-01-05 19:52 ` Andries Brouwer
2004-01-05 20:38 ` Linus Torvalds
2004-01-05 22:17 ` Shawn
2004-01-05 22:25 ` Mark Mielke
2004-01-05 23:05 ` Shawn
2004-01-05 23:23 ` Shawn
2004-01-06 0:43 ` Greg KH
2004-01-06 0:53 ` Shawn
2004-01-05 23:13 ` Andries Brouwer
2004-01-05 23:32 ` Linus Torvalds
2004-01-06 0:59 ` viro
2004-01-06 1:17 ` Linus Torvalds
2004-01-06 4:28 ` viro
2004-01-06 5:07 ` Linus Torvalds
2004-01-06 1:06 ` Andries Brouwer
2004-01-06 15:00 ` Mark Mielke
2004-01-06 0:00 ` Greg KH
2004-01-06 1:41 ` Andries Brouwer
2004-01-07 17:14 ` Greg KH
2004-01-06 0:31 ` Rob Landley
2004-01-06 7:14 ` Vojtech Pavlik
2004-01-05 7:44 ` James H. Cloos Jr.
2004-01-05 7:45 ` Nigel Cunningham
2004-01-05 11:01 ` Robin Rosenberg
2004-01-05 12:39 ` Nigel Cunningham
2004-01-07 13:39 ` Robin Rosenberg
2004-01-07 17:16 ` Nigel Cunningham
2004-01-05 9:06 ` Valdis.Kletnieks
2004-01-05 4:15 ` Peter Chubb
2004-01-05 4:42 ` Linus Torvalds
2004-01-01 19:43 ` Kai Henningsen
2004-01-02 7:26 ` Rob Landley
2004-01-04 8:57 ` Greg KH
2004-01-04 9:43 ` Rob Landley
2004-01-02 0:17 ` Maciej Zenczykowski
[not found] ` <20040102103104.GA28168@mark.mielke.cc>
2004-01-03 6:07 ` Greg KH
2004-01-03 6:51 ` Valdis.Kletnieks
2004-01-03 11:57 ` Ian Kent
2004-01-03 22:08 ` Greg KH
2004-01-07 10:23 ` Olaf Hering
2004-01-01 23:14 ` Rob
2004-01-02 3:53 ` Tyler Hall
2004-01-01 16:17 ` Pascal Schmidt
2004-01-01 20:03 ` Greg KH
2003-12-31 0:29 Greg KH
2003-12-31 0:29 ` Greg KH
2003-12-31 0:46 ` Johannes Erdfelt
2003-12-31 0:53 ` Prakash K. Cheemplavam
2003-12-31 0:53 ` Prakash K. Cheemplavam
2003-12-31 19:17 ` Greg KH
2003-12-31 19:17 ` Greg KH
2004-01-02 16:45 ` Shawn
2004-01-02 16:45 ` Shawn
2003-12-31 12:43 ` Paulo Marques
2004-01-01 1:18 ` Helge Hafting
2004-01-01 1:18 ` Helge Hafting
2004-01-03 5:59 ` Greg KH
2004-01-03 5:59 ` Greg KH
2004-01-03 15:22 ` Helge Hafting
2004-01-03 15:22 ` Helge Hafting
2004-01-03 21:18 ` viro
2004-01-03 21:18 ` viro
2004-01-03 22:11 ` Greg KH
2004-01-03 22:11 ` Greg KH
[not found] ` <20040103140140.3b848e9f.witukind@nsbm.kicks-ass.org>
2004-01-03 22:16 ` Greg KH
2004-01-03 22:16 ` Greg KH
2004-01-03 22:33 ` Christoph Hellwig
2004-01-03 22:33 ` Christoph Hellwig
2004-01-02 17:54 ` Andreas Jellinghaus
2004-01-02 18:19 ` Shawn
2004-03-29 15:38 ` Shawn
2004-03-29 15:39 ` Greg KH
2004-03-29 15:40 ` Helge Hafting
2004-03-29 15:40 ` Greg KH
2004-03-29 15:40 ` viro
2004-03-29 15:40 ` Greg KH
2004-03-29 15:40 ` Christoph Hellwig
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