Date: Sat, 10 Apr 2004 14:21:35 -0400 From: "Brian F. Feldman" <green@freebsd.org> To: noackjr@alumni.rice.edu Cc: freebsd-current@freebsd.org Subject: Re: What does 'lock order reversal' mean? Message-ID: <200404101821.i3AILZid013733@green.homeunix.org> In-Reply-To: Message from Jon Noack <noackjr@alumni.rice.edu> of "Fri, 09 Apr 2004 06:13:08 CDT." <40768544.2070806@alumni.rice.edu>
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Jon Noack <noackjr@alumni.rice.edu> wrote: > On 4/9/2004 5:04 AM, Artem Koutchine wrote: > > When i run test perl scripts (6 processes in parallel) > > which crate a big array, manupulate it, free and over again > > so 2GB of ram is used up and system starts using swap i see > > the message below (only onces). What does it mean? > > > > Apr 7 20:16:34 new kernel: lock order reversal > > Apr 7 20:16:34 new kernel: 1st 0xc79446b4 vm object (vm object) @ > > /usr/src/sys/vm/swap_pager.c:1313 > > Apr 7 20:16:35 new kernel: 2nd 0xc08b9e00 swap_pager swhash (swap_pager > > swhash) @ /usr/src/sys/vm/swap_pager.c:1803 > > Apr 7 20:16:35 new kernel: 3rd 0xc7898294 vm object (vm object) @ > > /usr/src/sys/vm/uma_core.c:886 > > This is: > 1) A FAQ. > 2) A false positive. > 3) Completely harmless. > > Previously reported to the list: > 1) 04/07/2004 (by you) > 2) 03/31/2004 > 3) 03/28/2004 > 4) 03/24/2004 > 5) 03/22/2004 > 6) 03/18/2004 > 7) ... > > For a good explanation of lock order reversals: > http://lists.freebsd.org/pipermail/freebsd-current/2003-December/016617.html > > I'll put up a webpage of false-positives if someone will commit a change > in the LOR warning to point to it (or something similar to this): > "lock order reversal: please see http://example.com for status before > reporting" > > I still think it would be best if this page were on the FreeBSD website, > but I'll host it if necessary. Let's make it happen. If either you want to host it or have me put it in http://people.freebsd.org/~green/ for now, that will be easiest. Actually putting it somewhere in the whole "FreeBSD web site" infrastructure means finding someone from the doc committers who knows more about it than I would. It would be better just to have a bug database that could handle this sort of task, maybe one day.... -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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