From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grzegorz Milos <gm281@cam.ac.uk>
Subject: Re: Xenbus watch firing over and over
Date: Fri, 05 Jan 2007 12:21:43 +0100
Message-ID: <459E34C7.4070605@cam.ac.uk>
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To: Jacob Gorm Hansen <jacobg@diku.dk>
Cc: xen-devel <Xen-devel@lists.xensource.com>
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Could you send mini-os diff?

Cheers
Gregor

Jacob Gorm Hansen wrote:
> hi,
> I am trying to add xenbus watch support to mini-os, but am getting into
> a endless loop of watches firing over and over. Below is an excerpt from
> the xenstore tracefile:
> 
> IN  0x805acc8 20070103 19:32:18 WATCH
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> CREATE watch 0x805a8b8
> OUT 0x805acc8 20070103 19:32:18 WATCH (OK )
> OUT 0x805acc8 20070103 19:32:18 WATCH_EVENT
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> IN  0x805acc8 20070103 19:32:18 UNWATCH
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> DESTROY watch 0x805a8b8
> OUT 0x805acc8 20070103 19:32:18 UNWATCH (OK )
> IN  0x805acc8 20070103 19:32:18 READ
> (/local/domain/0/backend/vif/26/0/state )
> OUT 0x805acc8 20070103 19:32:18 READ (5)
> IN  0x805acc8 20070103 19:32:18 WATCH
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> CREATE watch 0x806af60
> OUT 0x805acc8 20070103 19:32:18 WATCH (OK )
> OUT 0x805acc8 20070103 19:32:18 WATCH_EVENT
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> IN  0x805acc8 20070103 19:32:18 UNWATCH
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> DESTROY watch 0x806af60
> OUT 0x805acc8 20070103 19:32:18 UNWATCH (OK )
> IN  0x805acc8 20070103 19:32:18 READ
> (/local/domain/0/backend/vif/26/0/state )
> OUT 0x805acc8 20070103 19:32:18 READ (5)
> IN  0x805acc8 20070103 19:32:18 WATCH
> (/local/domain/0/backend/vif/26/0/state 00043818 )
> 
> ...
> 
> The same watch seems to be firing again and again, even though noone
> appears to be writing it. Should I some ack the watch, or is this a bug
> in xenstored?
> 
> This is with Xen 3.0.3.
> 
> Regards,
> Jacob
> 
> 
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