WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] crashes with 2.0 -- "Unable to reduce memory reservation

To: Chris Andrews <chris@xxxxxxxxxx>
Subject: Re: [Xen-devel] crashes with 2.0 -- "Unable to reduce memory reservation"
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Sat, 04 Sep 2004 16:56:27 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Delivery-date: Sat, 04 Sep 2004 16:58:55 +0100
Envelope-to: steven.hand@xxxxxxxxxxxx
In-reply-to: Your message of "Sat, 04 Sep 2004 15:13:20 BST." <932C5A73-FE7C-11D8-B2CF-000393B01B94@xxxxxxxxxx>
List-archive: <http://sourceforge.net/mailarchive/forum.php?forum=xen-devel>
List-help: <mailto:xen-devel-request@lists.sourceforge.net?subject=help>
List-id: List for Xen developers <xen-devel.lists.sourceforge.net>
List-post: <mailto:xen-devel@lists.sourceforge.net>
List-subscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=subscribe>
List-unsubscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=unsubscribe>
Sender: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
> When I ran 'xm destroy 3', I got the output below on the serial 
> console, and then a watchdog reboot but screen seems to have truncated 
> the lines. The second crash has untruncated output. I've added the 
> xensymoops output below.
> 
> Any thoughts?

Yes, I think we've seen this crash ourselves. The page reference
counts are getting corrupted, so the page has been freed already, and
when free_page_type() looks for the domain pointer in the struct
pfn_info, it has already been overwritten with a CPU mask (that field
changes purpose when a page is freed).

So, type count and usage count are out of sync....

The most likely culprit is the writable page tables, but as you've
noticed the bug is hard to trigger so it's difficult to try various
configurations and be sure which are safe!

 -- Keir


-------------------------------------------------------
This SF.Net email is sponsored by BEA Weblogic Workshop
FREE Java Enterprise J2EE developer tools!
Get your free copy of BEA WebLogic Workshop 8.1 today.
http://ads.osdn.com/?ad_id=5047&alloc_id=10808&op=click
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel

<Prev in Thread] Current Thread [Next in Thread>